duplicate values - Page 842

Session caching problem

- by Levani

I have a strange problem with php sessions. I use them for authorization on my site. I store two variables - currently logged in user's id and username in session. When I log in with one username, than log out and log in again with another username the previous user's id is returned using the session variable instead of the current user. The most strange thing is that this happens only when it comes to insert some data into database. When I directly echo this variable the correct id is displayed, but when I insert new record into database this variable sends incorrect id. Here is the php code I use for sending data into database: <?php session_start(); //connect database require_once 'dbc.php'; $authorID = $_SESSION['user_id']; if ( $authorID != 0 ) { $content = htmlentities($_POST["answ_content"],ENT_COMPAT,'UTF-8'); $dro = date('Y-m-d H:i:s'); $qID = $_POST["question_ID"]; $author = 'avtori'; $sql="INSERT INTO comments (comment_ID, comment_post_ID, comment_author, comment_date, comment_content, user_id) VALUES (NULL, '$qID', '$author', '$dro', '$content', '$authorID')"; $result = mysql_query($sql); } else { echo 'error'; } ?> Can anyone please help? Here is the logout function: function logout() { global $db; session_start(); if(isset($_SESSION['user_id']) || isset($_COOKIE['user_id'])) { mysql_query("update `users` set `ckey`= '', `ctime`= '' where `id`='$_SESSION[user_id]' OR `id` = '$_COOKIE[user_id]'") or die(mysql_error()); } /************ Delete the sessions****************/ unset($_SESSION['user_id']); unset($_SESSION['user_name']); unset($_SESSION['user_level']); unset($_SESSION['HTTP_USER_AGENT']); session_unset(); session_destroy(); /* Delete the cookies*******************/ setcookie("user_id", '', time()-60*60*24*COOKIE_TIME_OUT, "/"); setcookie("user_name", '', time()-60*60*24*COOKIE_TIME_OUT, "/"); setcookie("user_key", '', time()-60*60*24*COOKIE_TIME_OUT, "/"); header("Location: index.php"); } Here is the authentication script: include 'dbc.php'; $err = array(); foreach($_GET as $key => $value) { $get[$key] = filter($value); //get variables are filtered. } if ($_POST['doLogin']=='Login') { foreach($_POST as $key => $value) { $data[$key] = filter($value); // post variables are filtered } $user_email = $data['usr_email']; $pass = $data['pwd']; if (strpos($user_email,'@') === false) { $user_cond = "user_name='$user_email'"; } else { $user_cond = "user_email='$user_email'"; } $result = mysql_query("SELECT `id`,`pwd`,`full_name`,`approved`,`user_level` FROM users WHERE $user_cond AND `banned` = '0' ") or die (mysql_error()); $num = mysql_num_rows($result); // Match row found with more than 1 results - the user is authenticated. if ( $num > 0 ) { list($id,$pwd,$full_name,$approved,$user_level) = mysql_fetch_row($result); if(!$approved) { //$msg = urlencode("Account not activated. Please check your email for activation code"); $err[] = "Account not activated. Please check your email for activation code"; //header("Location: login.php?msg=$msg"); //exit(); } //check against salt if ($pwd === PwdHash($pass,substr($pwd,0,9))) { // this sets session and logs user in session_start(); session_regenerate_id (true); //prevent against session fixation attacks. // this sets variables in the session $_SESSION['user_id']= $id; $_SESSION['user_name'] = $full_name; $_SESSION['user_level'] = $user_level; $_SESSION['HTTP_USER_AGENT'] = md5($_SERVER['HTTP_USER_AGENT']); //update the timestamp and key for cookie $stamp = time(); $ckey = GenKey(); mysql_query("update users set `ctime`='$stamp', `ckey` = '$ckey' where id='$id'") or die(mysql_error()); //set a cookie if(isset($_POST['remember'])){ setcookie("user_id", $_SESSION['user_id'], time()+60*60*24*COOKIE_TIME_OUT, "/"); setcookie("user_key", sha1($ckey), time()+60*60*24*COOKIE_TIME_OUT, "/"); setcookie("user_name",$_SESSION['user_name'], time()+60*60*24*COOKIE_TIME_OUT, "/"); } if(empty($err)){ header("Location: myaccount.php"); } } else { //$msg = urlencode("Invalid Login. Please try again with correct user email and password. "); $err[] = "Invalid Login. Please try again with correct user email and password."; //header("Location: login.php?msg=$msg"); } } else { $err[] = "Error - Invalid login. No such user exists"; } }

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PHP submit problem

- by TaG

I'm trying to check if the username is available and display it for the user to see when they check there account settings, which I have done. BUT when the user tries to fill out another field I get the Your username is unavailable! which should not pop up because its the users username already. I want to know how can I fix this problem using PHP so that the users name is displayed every time the user views their account settings and it wont cause problems when a user submits additional info? Here is the PHP code. if (isset($_POST['submitted'])) { require_once '../htmlpurifier/library/HTMLPurifier.auto.php'; $config = HTMLPurifier_Config::createDefault(); $config->set('Core.Encoding', 'UTF-8'); $config->set('HTML.Doctype', 'XHTML 1.0 Strict'); $config->set('HTML.TidyLevel', 'heavy'); $config->set('HTML.SafeObject', true); $config->set('HTML.SafeEmbed', true); $purifier = new HTMLPurifier($config); $mysqli = mysqli_connect("localhost", "root", "", "sitename"); $dbc = mysqli_query($mysqli,"SELECT users.* FROM users WHERE user_id=3"); $first_name = mysqli_real_escape_string($mysqli, $purifier->purify(htmlentities(strip_tags($_POST['first_name'])))); $username = mysqli_real_escape_string($mysqli, $purifier->purify(htmlentities(strip_tags($_POST['username'])))); if($_POST['username']) { $u = "SELECT user_id FROM users WHERE username = '$username'"; $r = mysqli_query ($mysqli, $u) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($mysqli)); if (mysqli_num_rows($r) == TRUE) { $username = NULL; echo '<p class="error">Your username is unavailable!</p>'; } else if(mysqli_num_rows($r) == 0) { $username = mysqli_real_escape_string($mysqli, $purifier->purify(htmlentities(strip_tags($_POST['username'])))); if ($_POST['password1'] == $_POST['password2']) { $sha512 = hash('sha512', $_POST['password1']); $password = mysqli_real_escape_string($mysqli, $purifier->purify(strip_tags($sha512))); } else { $password = NULL; } if($password == NULL) { echo '<p class="error">Your password did not match the confirmed password!</p>'; } else { if (mysqli_num_rows($dbc) == 0) { $mysqli = mysqli_connect("localhost", "root", "", "sitename"); $dbc = mysqli_query($mysqli,"INSERT INTO users (user_id, first_name, username, password) VALUES ('$user_id', '$first_name', '$username', '$password')"); } if ($dbc == TRUE) { $dbc = mysqli_query($mysqli,"UPDATE users SET first_name = '$first_name', username = '$username', password = '$password' WHERE user_id = '$user_id'"); echo '<p class="changes-saved">Your changes have been saved!</p>'; } if (!$dbc) { print mysqli_error($mysqli); return; } } } } } Here is the html form. <form method="post" action="index.php"> <fieldset> <ul> <li><label for="first_name">First Name: </label><input type="text" name="first_name" id="first_name" size="25" class="input-size" value="<?php if (isset($_POST['first_name'])) { echo stripslashes(htmlentities(strip_tags($_POST['first_name']))); } else if(!empty($first_name)) { echo stripslashes(htmlentities(strip_tags($first_name))); } ?>" /></li> <li><label for="username">UserName: </label><input type="text" name="username" id="username" size="25" class="input-size" value="<?php if (isset($_POST['username'])) { echo stripslashes(htmlentities(strip_tags($_POST['username']))); } else if(!empty($username)) { echo stripslashes(htmlentities(strip_tags($username))); } ?>" /><br /><span>(ex: CSSKing, butterball)</span></li> <li><label for="password1">Password: </label><input type="password" name="password1" id="password1" size="25" class="input-size" value="<?php if (isset($_POST['password1'])) { echo stripslashes(htmlentities(strip_tags($_POST['password1']))); } ?>" /></li> <li><label for="password2">Confirm Password: </label><input type="password" name="password2" id="password2" size="25" class="input-size" value="<?php if (isset($_POST['password2'])) { echo stripslashes(htmlentities(strip_tags($_POST['password2']))); } ?>" /></li> <li><input type="submit" name="submit" value="Save Changes" class="save-button" /> <input type="hidden" name="submitted" value="true" /> <input type="submit" name="submit" value="Preview Changes" class="preview-changes-button" /></li> </ul> </fieldset> </form>

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Neural Network Always Produces Same/Similar Outputs for Any Input

- by l33tnerd

I have a problem where I am trying to create a neural network for Tic-Tac-Toe. However, for some reason, training the neural network causes it to produce nearly the same output for any given input. I did take a look at Artificial neural networks benchmark, but my network implementation is built for neurons with the same activation function for each neuron, i.e. no constant neurons. To make sure the problem wasn't just due to my choice of training set (1218 board states and moves generated by a genetic algorithm), I tried to train the network to reproduce XOR. The logistic activation function was used. Instead of using the derivative, I multiplied the error by output*(1-output) as some sources suggested that this was equivalent to using the derivative. I can put the Haskell source on HPaste, but it's a little embarrassing to look at. The network has 3 layers: the first layer has 2 inputs and 4 outputs, the second has 4 inputs and 1 output, and the third has 1 output. Increasing to 4 neurons in the second layer didn't help, and neither did increasing to 8 outputs in the first layer. I then calculated errors, network output, bias updates, and the weight updates by hand based on http://hebb.mit.edu/courses/9.641/2002/lectures/lecture04.pdf to make sure there wasn't an error in those parts of the code (there wasn't, but I will probably do it again just to make sure). Because I am using batch training, I did not multiply by x in equation (4) there. I am adding the weight change, though http://www.faqs.org/faqs/ai-faq/neural-nets/part2/section-2.html suggests to subtract it instead. The problem persisted, even in this simplified network. For example, these are the results after 500 epochs of batch training and of incremental training. Input |Target|Output (Batch) |Output(Incremental) [1.0,1.0]|[0.0] |[0.5003781562785173]|[0.5009731800870864] [1.0,0.0]|[1.0] |[0.5003740346965251]|[0.5006347214672715] [0.0,1.0]|[1.0] |[0.5003734471544522]|[0.500589332376345] [0.0,0.0]|[0.0] |[0.5003674110937019]|[0.500095157458231] Subtracting instead of adding produces the same problem, except everything is 0.99 something instead of 0.50 something. 5000 epochs produces the same result, except the batch-trained network returns exactly 0.5 for each case. (Heck, even 10,000 epochs didn't work for batch training.) Is there anything in general that could produce this behavior? Also, I looked at the intermediate errors for incremental training, and the although the inputs of the hidden/input layers varied, the error for the output neuron was always +/-0.12. For batch training, the errors were increasing, but extremely slowly and the errors were all extremely small (x10^-7). Different initial random weights and biases made no difference, either. Note that this is a school project, so hints/guides would be more helpful. Although reinventing the wheel and making my own network (in a language I don't know well!) was a horrible idea, I felt it would be more appropriate for a school project (so I know what's going on...in theory, at least. There doesn't seem to be a computer science teacher at my school). EDIT: Two layers, an input layer of 2 inputs to 8 outputs, and an output layer of 8 inputs to 1 output, produces much the same results: 0.5+/-0.2 (or so) for each training case. I'm also playing around with pyBrain, seeing if any network structure there will work. Edit 2: I am using a learning rate of 0.1. Sorry for forgetting about that. Edit 3: Pybrain's "trainUntilConvergence" doesn't get me a fully trained network, either, but 20000 epochs does, with 16 neurons in the hidden layer. 10000 epochs and 4 neurons, not so much, but close. So, in Haskell, with the input layer having 2 inputs & 2 outputs, hidden layer with 2 inputs and 8 outputs, and output layer with 8 inputs and 1 output...I get the same problem with 10000 epochs. And with 20000 epochs. Edit 4: I ran the network by hand again based on the MIT PDF above, and the values match, so the code should be correct unless I am misunderstanding those equations. Some of my source code is at http://hpaste.org/42453/neural_network__not_working; I'm working on cleaning my code somewhat and putting it in a Github (rather than a private Bitbucket) repository. All of the relevant source code is now at https://github.com/l33tnerd/hsann.

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OpenGL render vs. own Phong Illumination Implementation

- by Myx

Hello: I have implemented a Phong Illumination Scheme using a camera that's centered at (0,0,0) and looking directly at the sphere primitive. The following are the relevant contents of the scene file that is used to view the scene using OpenGL as well as to render the scene using my own implementation: ambient 0 1 0 dir_light 1 1 1 -3 -4 -5 # A red sphere with 0.5 green ambiance, centered at (0,0,0) with radius 1 material 0 0.5 0 1 0 0 1 0 0 0 0 0 0 0 0 10 1 0 sphere 0 0 0 0 1 The resulting image produced by OpenGL. The image that my rendering application produces. As you can see, there are various differences between the two: The specular highlight on my image is smaller than the one in OpenGL. The diffuse surface seems to not diffuse in the correct way, resulting in the yellow region to be unneccessarily large in my image, whereas in OpenGL there's a nice dark green region closer to the bottom of the sphere The color produced by OpenGL is much darker than the one in my image. Those are the most prominent three differences that I see. The following is my implementation of the Phong illumination: R3Rgb Phong(R3Scene *scene, R3Ray *ray, R3Intersection *intersection) { R3Rgb radiance; if(intersection->hit == 0) { radiance = scene->background; return radiance; } R3Vector normal = intersection->normal; R3Rgb Kd = intersection->node->material->kd; R3Rgb Ks = intersection->node->material->ks; // obtain ambient term R3Rgb intensity_ambient = intersection->node->material->ka*scene->ambient; // obtain emissive term R3Rgb intensity_emission = intersection->node->material->emission; // for each light in the scene, obtain calculate the diffuse and specular terms R3Rgb intensity_diffuse(0,0,0,1); R3Rgb intensity_specular(0,0,0,1); for(unsigned int i = 0; i < scene->lights.size(); i++) { R3Light *light = scene->Light(i); R3Rgb light_color = LightIntensity(scene->Light(i), intersection->position); R3Vector light_vector = -LightDirection(scene->Light(i), intersection->position); // calculate diffuse reflection intensity_diffuse += Kd*normal.Dot(light_vector)*light_color; // calculate specular reflection R3Vector reflection_vector = 2.*normal.Dot(light_vector)*normal-light_vector; reflection_vector.Normalize(); R3Vector viewing_vector = ray->Start() - intersection->position; viewing_vector.Normalize(); double n = intersection->node->material->shininess; intensity_specular += Ks*pow(max(0.,viewing_vector.Dot(reflection_vector)),n)*light_color; } radiance = intensity_emission+intensity_ambient+intensity_diffuse+intensity_specular; return radiance; } Here are the related LightIntensity(...) and LightDirection(...) functions: R3Vector LightDirection(R3Light *light, R3Point position) { R3Vector light_direction; switch(light->type) { case R3_DIRECTIONAL_LIGHT: light_direction = light->direction; break; case R3_POINT_LIGHT: light_direction = position-light->position; break; case R3_SPOT_LIGHT: light_direction = position-light->position; break; } light_direction.Normalize(); return light_direction; } R3Rgb LightIntensity(R3Light *light, R3Point position) { R3Rgb light_intensity; double distance; double denominator; if(light->type != R3_DIRECTIONAL_LIGHT) { distance = (position-light->position).Length(); denominator = light->constant_attenuation + light->linear_attenuation*distance + light->quadratic_attenuation*distance*distance; } switch(light->type) { case R3_DIRECTIONAL_LIGHT: light_intensity = light->color; break; case R3_POINT_LIGHT: light_intensity = light->color/denominator; break; case R3_SPOT_LIGHT: R3Vector from_light_to_point = position - light->position; light_intensity = light->color*( pow(light->direction.Dot(from_light_to_point), light->angle_attenuation)); break; } return light_intensity; } I would greatly appreciate any suggestions as to any implementation errors that are apparent. I am wondering if the differences could be occurring simply because of the gamma values used for display by OpenGL and the default gamma value for my display. I also know that OpenGL (or at least tha parts that I was provided) can't cast shadows on objects. Not that this is relevant for the point in question, but it just leads me to wonder if it's simply display and capability differences between OpenGL and what I am trying to do. Thank you for your help.

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Javascript stockticker : not showing data on php page

- by developer

iam not getting any javascript errors , code is getting rendered properly only, but still server not displaying data on the page. please check the code below . <style type="text/css"> #marqueeborder { color: #cccccc; background-color: #EEF3E2; font-family:"Lucida Console", Monaco, monospace; position:relative; height:20px; overflow:hidden; font-size: 0.7em; } #marqueecontent { position:absolute; left:0px; line-height:20px; white-space:nowrap; } .stockbox { margin:0 10px; } .stockbox a { color: #cccccc; text-decoration : underline; } </style> </head> <body> <div id="marqueeborder" onmouseover="pxptick=0" onmouseout="pxptick=scrollspeed"> <div id="marqueecontent"> <?php // Original script by Walter Heitman Jr, first published on http://techblog.shanock.com // List your stocks here, separated by commas, no spaces, in the order you want them displayed: $stocks = "idt,iye,mill,pwer,spy,f,msft,x,sbux,sne,ge,dow,t"; // Function to copy a stock quote CSV from Yahoo to the local cache. CSV contains symbol, price, and change function upsfile($stock) { copy("http://finance.yahoo.com/d/quotes.csv?s=$stock&f=sl1c1&e=.csv","stockcache/".$stock.".csv"); } foreach ( explode(",", $stocks) as $stock ) { // Where the stock quote info file should be... $local_file = "stockcache/".$stock.".csv"; // ...if it exists. If not, download it. if (!file_exists($local_file)) { upsfile($stock); } // Else,If it's out-of-date by 15 mins (900 seconds) or more, update it. elseif (filemtime($local_file) <= (time() - 900)) { upsfile($stock); } // Open the file, load our values into an array... $local_file = fopen ("stockcache/".$stock.".csv","r"); $stock_info = fgetcsv ($local_file, 1000, ","); // ...format, and output them. I made the symbols into links to Yahoo's stock pages. echo "<span class=\"stockbox\"><a href=\"http://finance.yahoo.com/q?s=".$stock_info[0]."\">".$stock_info[0]."</a> ".sprintf("%.2f",$stock_info[1])." <span style=\""; // Green prices for up, red for down if ($stock_info[2]>=0) { echo "color: #009900;\">↑"; } elseif ($stock_info[2]<0) { echo "color: #ff0000;\">↓"; } echo sprintf("%.2f",abs($stock_info[2]))."</span></span>\n"; // Done! fclose($local_file); } ?> <span class="stockbox" style="font-size:0.6em">Quotes from <a href="http://finance.yahoo.com/">Yahoo Finance</a></span> </div> </div> </body> <script type="text/javascript"> // Original script by Walter Heitman Jr, first published on http://techblog.shanock.com // Set an initial scroll speed. This equates to the number of pixels shifted per tick var scrollspeed=2; var pxptick=scrollspeed; var marqueediv=''; var contentwidth=""; var marqueewidth = ""; function startmarquee(){ alert("hi"); // Make a shortcut referencing our div with the content we want to scroll marqueediv=document.getElementById("marqueecontent"); //alert("marqueediv"+marqueediv); alert("hi"+marqueediv.innerHTML); // Get the total width of our available scroll area marqueewidth=document.getElementById("marqueeborder").offsetWidth; alert("marqueewidth"+marqueewidth); // Get the width of the content we want to scroll contentwidth=marqueediv.offsetWidth; alert("contentwidth"+contentwidth); // Start the ticker at 50 milliseconds per tick, adjust this to suit your preferences // Be warned, setting this lower has heavy impact on client-side CPU usage. Be gentle. var lefttime=setInterval("scrollmarquee()",50); alert("lefttime"+lefttime); } function scrollmarquee(){ // Check position of the div, then shift it left by the set amount of pixels. if (parseInt(marqueediv.style.left)>(contentwidth*(-1))) marqueediv.style.left=parseInt(marqueediv.style.left)-pxptick+"px"; //alert("hikkk"+marqueediv.innerHTML);} // If it's at the end, move it back to the right. else{ alert("marqueewidth"+marqueewidth); marqueediv.style.left=parseInt(marqueewidth)+"px"; } } window.onload=startmarquee; </script> </html> Below is the server displayed page. I have updated with screenshot with your suggestion, i made change in html too, to check what is showing by child dev

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Why can i read dirty rows in MySql

- by acidzombie24

I cant believe this, i always throught the below would be concurrency safe. I write to a row in one transaction and i am able to read the dirty value from another transaction/command/connection! Why is this possible (not my main question) isnt this not desired and cause more troubles!?! Anyways, i expected that once i write to a row nothing else will be able to read to the row until the transaction is finished. And at least if the row can be still read that the clean (original) value will be read. (but maybe that would cause problems as well if the transaction doesnt use the newly commited data from the other transaction when it is ran) I would like count to == 11. I thought this would be safe in all variants of sql. What can i do to either 1) Not read the dirty value but clean 2) Have that row be locked until the transaction is finished? static MySqlConnection MakeConn() { string connStr = "server=192.168.126.128;user=root;database=TestDB;port=3306;password=a;"; MySqlConnection conn = new MySqlConnection(connStr); conn.Open(); return conn; } static Semaphore sem1 = new Semaphore(1, 1); static Semaphore sem2 = new Semaphore(1, 1); static void Main2() { Console.WriteLine("Starting Test"); // sem1.WaitOne(); Console.WriteLine("1W"); sem2.WaitOne(); Console.WriteLine("2W"); Thread oThread = new Thread(new ThreadStart(fn2)); oThread.Start(); var conn = MakeConn(); var cmd = new MySqlCommand(@" CREATE TABLE IF NOT EXISTS Persons ( P_Id int NOT NULL, name varchar(255), count int, PRIMARY KEY (P_Id) )", conn); cmd.ExecuteNonQuery(); cmd.CommandText = "delete from Persons; insert into Persons(name, count) VALUES('E', '4');"; cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; var count = (int)cmd.ExecuteScalar(); Console.WriteLine("Finish inserting. v={0}", count); sem2.Release(); Console.WriteLine("2R"); sem1.WaitOne(); Console.WriteLine("1W"); Console.WriteLine("Starting transaction"); using (var tns = conn.BeginTransaction()) { cmd.CommandText = "update Persons set count=count+1"; cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); sem2.Release(); Console.WriteLine("2R"); sem1.WaitOne(); Console.WriteLine("1W"); count += 5; //10 cmd.CommandText = "update Persons set count=" + count.ToString(); cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); tns.Commit(); } Console.WriteLine("finished transaction 1"); sem2.Release(); Console.WriteLine("2R"); sem1.WaitOne(); Console.WriteLine("1W"); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); sem2.Release(); Console.WriteLine("2R"); //sem1.WaitOne(); Console.WriteLine("1W"); } static void fn2() { int count; Console.WriteLine("Starting thread 2"); sem2.WaitOne(); Console.WriteLine("1W"); var conn = MakeConn(); var cmd = new MySqlCommand("", conn); sem1.Release(); Console.WriteLine("1R"); sem2.WaitOne(); Console.WriteLine("2W"); using (var tns = conn.BeginTransaction()) { cmd.CommandText = "update Persons set count=count+1"; cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); sem1.Release(); Console.WriteLine("1R"); sem2.WaitOne(); Console.WriteLine("2W"); tns.Commit(); } Console.WriteLine("finished transaction 2"); sem1.Release(); Console.WriteLine("1R"); sem2.WaitOne(); Console.WriteLine("2W"); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); //should be 11. 4 + 1x2(one each thread) += 5 from first thread == 11 sem1.Release(); Console.WriteLine("1R"); } console Starting Test 1W 2W Starting thread 2 Finish inserting. v=4 2R 1W 1R 1W Starting transaction count is 5 2R 2W count is 6 1R 1W count is 10 finished transaction 1 2R 2W finished transaction 2 1R 1W count is 10 2R 2W count is 10 1R

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Optimistic non-locking copy of InnoDB .frm files

- by jothir

MySQL Enterprise Backup(MEB) does hot backup of innodb data and log files. Till MEB 3.6.1, the user backs up the only innodb tables in a 3 step process: STEP 1. Take backup using --only-innodb option STEP 2. Temporarily make the table read only by executing “FLUSH TABLES WITH READ LOCK” MEB 3.7.0 has an enhancement to innodb file copying. The .frm files gets copied along with the hot backup done for innodb files. I would like to make the blog a little interactive by explaining the feature as answers: 1. What are these .frm files? The files containing the metadata, such as the table definition, of a MySQL table. For backups, the full set of .frm files are always required along with the backup data, to be able to restore tables that are altered or dropped after the backup. 2. Can the .frm files not be copied by MEB itself? --only-innodb-with-frm is the new option introduced in MEB 3.7.1 to do a copy of .frm files without locking the tables during backup operation itself. This is to reduce the pain of manually copying the .frm files. The option is intended for backups where you can ensure that no ALTER TABLE, CREATE TABLE, DROP TABLE, or other DDL statements modify the .frm files for InnoDB tables during the backup operation. 3. How is data consistency ensured? MEB does validation of the .frm files after copying by comparing with the server directory to see if the timestamps of any of the .frm files is greater than the saved system time (check .frm time). This change in timestamp of the .frm files will show if a table is altered during the process of backup. The total number of frm files in the server directory is also verified against the copied contents. If the number of .frm files is less compared to server directory, it shows that table/tables have been dropped during the process of backup. If the number of .frm files is more compared to server directory, it shows that new table/tables have been created during backup operation. 4. How does MEB handle data inconsistency? MEB copies the .frm files through several iterations, does the validation and throws a WARNING if there is any inconsistency found in .frm files at the end of backup operation. This means the user is warned of some DDL operations that had occurred during backup operation, and has to manually copy the .frm files or do a backup again. 5. What is the option and explain its usage? The option introduced is --only-innodb-with-frm which does optimistic copy of .frm files without locking. This can be used when the user wants to backup only innodb tables along with .frm files. The option can take one of the 2 values: all | related. --only-innodb-with-frm=all does copy of all .frm files of all innodb tables. --only-innodb-with-frm=related works in conjunction with --include option.This is to allow partial backup of .frm files corresponding to the tables specified in --include. Let me show the usage with example output: ./mysqlbackup -uroot --backup-dir=/logs/backupWithFrmAll --only-innodb-with-frm=all backup MySQL Enterprise Backup version 3.7.1 [2012/06/05] Copyright (c) 2003, 2012, Oracle and/or its affiliates. All Rights Reserved. INFO: Starting with following command line ... ./mysqlbackup -uroot --backup-dir=/logs/backupWithFrmAll --only-innodb-with-frm=all backup INFO: Got some server configuration information from running server. IMPORTANT: Please check that mysqlbackup run completes successfully. At the end of a successful 'backup' run mysqlbackup prints "mysqlbackup completed OK!". -------------------------------------------------------------------- Server Repository Options: -------------------------------------------------------------------- datadir = /mysql/trydb/ innodb_data_home_dir = innodb_data_file_path = ibdata1:10M:autoextend innodb_log_group_home_dir = /mysql/trydb/ innodb_log_files_in_group = 2 innodb_log_file_size = 5242880 -------------------------------------------------------------------- Backup Config Options: -------------------------------------------------------------------- datadir = /logs/backupWithFrmAll/datadir innodb_data_home_dir = /logs/backupWithFrmAll/datadir innodb_data_file_path = ibdata1:10M:autoextend innodb_log_group_home_dir = /logs/backupWithFrmAll/datadir innodb_log_files_in_group = 2 innodb_log_file_size = 5242880 mysqlbackup: INFO: Unique generated backup id for this is 13451979804504860 mysqlbackup: INFO: Uses posix_fadvise() for performance optimization. mysqlbackup: INFO: System tablespace file format is Antelope. mysqlbackup: INFO: Found checkpoint at lsn 1656792. mysqlbackup: INFO: Starting log scan from lsn 1656320. 120817 15:36:22 mysqlbackup: INFO: Copying log... 120817 15:36:22 mysqlbackup: INFO: Log copied, lsn 1656792. We wait 1 second before starting copying the data files... 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/ibdata1 (Antelope file format). 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/innodb1/table2.ibd (Antelope file format). 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/innodb1/table3.ibd (Antelope file format). 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/innodb1/table1.ibd (Antelope file format). mysqlbackup: INFO: Opening backup source directory '/mysql/trydb/' 120817 15:36:23 mysqlbackup: INFO: Starting to backup .frm files in the subdirectories of /mysql/trydb/ mysqlbackup: INFO: Copying innodb data and logs during final stage ... mysqlbackup: INFO: A copied database page was modified at 1656792. (This is the highest lsn found on page) Scanned log up to lsn 1656792. Was able to parse the log up to lsn 1656792. Maximum page number for a log record 0 mysqlbackup: INFO: Copying non-innodb files took 2.000 seconds 120817 15:36:25 mysqlbackup: INFO: Full backup completed! mysqlbackup: INFO: Backup created in directory '/logs/backupWithFrmAll' ------------------------------------------------------------- Parameters Summary ------------------------------------------------------------- Start LSN : 1656320 End LSN : 1656792 ------------------------------------------------------------- mysqlbackup completed OK! bash$ ls /logs/backupWithFrmAll/datadir/innodb1/ table1.frm table1.ibd table2.frm table2.ibd table3.frm table3.ibd Here the backup directory contains all the .frm files of all the innodb tables. ./mysqlbackup -uroot --backup-dir=/logs/backupWithFrm --include="innodb1.table3.*" --only-innodb-with-frm=related backup MySQL Enterprise Backup version 3.7.1 [2012/06/05] Copyright (c) 2003, 2012, Oracle and/or its affiliates. All Rights Reserved. INFO: Starting with following command line ... ./mysqlbackup -uroot --backup-dir=/logs/backup371frm --include=innodb1.table3.* --only-innodb-with-frm=related backup INFO: Got some server configuration information from running server. IMPORTANT: Please check that mysqlbackup run completes successfully. At the end of a successful 'backup' run mysqlbackup prints "mysqlbackup completed OK!". -------------------------------------------------------------------- Server Repository Options: -------------------------------------------------------------------- datadir = /mysql/trydb/ innodb_data_home_dir = innodb_data_file_path = ibdata1:10M:autoextend innodb_log_group_home_dir = /mysql/trydb innodb_log_files_in_group = 2 innodb_log_file_size = 5242880 -------------------------------------------------------------------- Backup Config Options: -------------------------------------------------------------------- datadir = /logs/backupWithFrm/datadir innodb_data_home_dir = /logs/backupWithFrm/datadir innodb_data_file_path = ibdata1:10M:autoextend innodb_log_group_home_dir = /logs/backupWithFrm/datadir innodb_log_files_in_group = 2 innodb_log_file_size = 5242880 mysqlbackup: INFO: Unique generated backup id for this is 13451973458118162 mysqlbackup: INFO: Uses posix_fadvise() for performance optimization. mysqlbackup: INFO: The --include option specified: innodb1.table3.* mysqlbackup: INFO: System tablespace file format is Antelope. mysqlbackup: INFO: Found checkpoint at lsn 1656792. mysqlbackup: INFO: Starting log scan from lsn 1656320. 120817 15:25:47 mysqlbackup: INFO: Copying log... 120817 15:25:47 mysqlbackup: INFO: Log copied, lsn 1656792. We wait 1 second before starting copying the data files... 120817 15:25:48 mysqlbackup: INFO: Copying /mysql/trydbibdata1 (Antelope file format). 120817 15:25:49 mysqlbackup: INFO: Copying /mysql/trydbinnodb1/table3.ibd (Antelope file format). mysqlbackup: INFO: Opening backup source directory '/mysql/trydb' 120817 15:25:49 mysqlbackup: INFO: Starting to backup .frm files in the subdirectories of /mysql/trydb mysqlbackup: INFO: Copying innodb data and logs during final stage ... mysqlbackup: INFO: A copied database page was modified at 1656792. (This is the highest lsn found on page) Scanned log up to lsn 1656792. Was able to parse the log up to lsn 1656792. Maximum page number for a log record 0 mysqlbackup: INFO: Copying non-innodb files took 2.000 seconds 120817 15:25:51 mysqlbackup: INFO: Full backup completed! mysqlbackup: INFO: Backup created in directory '/logs/backupWithFrm' ------------------------------------------------------------- Parameters Summary ------------------------------------------------------------- Start LSN : 1656320 End LSN : 1656792 ------------------------------------------------------------- mysqlbackup completed OK! bash$ ls /logs/backupWithFrm/datadir/innodb1/ table3.frm table3.ibd Thus the backup directory contains only the .frm file matching the innodb table name specified in --include option. In a nutshell, we present our great new option --only-innodb-with-frm which is a true hot InnoDB-only backup with .frm files, but with an additional check, if any DDL happened during the backup. If a DDL has happened, the DBA can decide if to repeat the backup, or to live with the potential inconsistency. This is the ideal solution for users that have all their "real" data in InnoDB and seldom change their schemas. You may also like: http://dev.mysql.com/doc/mysql-enterprise-backup/3.7/en/backup-partial-options.html STEP 3. Manually copy the .frm files of innodb tables to the destination directory where backup is stored.

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CodePlex Daily Summary for Saturday, May 10, 2014

CodePlex Daily Summary for Saturday, May 10, 2014Popular ReleasesTerraMap (Terraria World Map Viewer): TerraMap 1.0.3.14652: Added support for the new Terraria v1.2.4 update. New items, walls, and tiles The setup file will make sure .NET 4 is installed, install TerraMap, create desktop and start menu shortcuts, add a .wld file association, and launch TerraMap. If you prefer the zip file, make sure you have .NET Framework v4.5 installed, then just download and extract the ZIP file, and run TerraMap.exe.R.NET: R.NET 1.5.12: R.NET 1.5.12 is a beta release towards R.NET 1.6. You are encouraged to use 1.5.12 now and give feedback. See the documentation for setup and usage instructions. Main changes for R.NET 1.5.12: The C stack limit was not disabled on Windows. For reasons possibly peculiar to R, this means that non-concurrent access to R from multiple threads was not stable. This is now fixed, with the fix validated with a unit test. Thanks to Odugen, skyguy94, and previously others (evolvedmicrobe, tomasp) fo...CTI Text Encryption: CTI Text Encryption 5.2: Change log: 5.2 - Remove Cut button. - Fixed Reset All button does not reset encrypted text column. - Switch button location between Copy and Paste. - Enable users to use local fonts to display characters of their language correctly. (A font settings file will be saved at the same folder of this program.) 5.1 - Improve encryption process. - Minor UI update. - Version 5.1 is not compatible with older version. 5.0 - Improve encryption algorithm. - Simply inner non-encryption related mec...SEToolbox: SEToolbox 01.029.006 Release 1: Fix to allow keyboard search on load dialog. (type the first few letters of your save) Fixed check for new release. Changed the way ship details are loaded to alleviate load time for worlds with very large ships (100,000+ blocks). Fixed Image importer, was incorrectly listing 'Asteroid' as import option. Minor changes to menus (text and appearance) for clarity and OS consistency. Added in reading of world palette for color dialog editor. WIP on subsystem editor. Can now multiselec...Media Companion: Media Companion MC3.597b: Thank you for being patient, againThere are a number of fixes in place with this release. and some new features added. Most are self explanatory, so check out the options in Preferences. Couple of new Features:* Movie - Allow save Title and Sort Title in Title Case format. * Movie - Allow save fanart.jpg if movie in folder. * TV - display episode source. Get episode source from episode filename. Fixed:* Movie - Added Fill Tags from plot keywords to Batch Rescraper. * Movie - Fixed TMDB s...SimCityPak: SimCityPak 0.3.0.0: Contains several bugfixes, newly identified properties and some UI improvements. Main new features UI overhaul for the main index list: Icons for each different index, including icons for different property files Tooltips for all relevant fields Removed clutter Identified hundreds of additional properties (thanks to MaxisGuillaume) - this should make modding gameplay easierSeal Report: Seal Report 1.4: New Features: Report Designer: New option to convert a Report Source into a Repository Source. Report Designer: New contextual helper menus to select, remove, copy, prompt elements in a model. Web Server: New option to expand sub-folders displayed in the tree view. Web Server: Web Folder Description File can be a .cshtml file to display a MVC View. Views: additional CSS parameters for some DIVs. NVD3 Chart: Some default configuration values have been changed. Issues Addressed:16 ...Magick.NET: Magick.NET 6.8.9.002: Magick.NET linked with ImageMagick 6.8.9.0.VidCoder: 1.5.22 Beta: Added ability to burn SRT subtitles. Updated to HandBrake SVN 6169. Added checks to prevent VidCoder from running with a database version newer than it expects. Tooltips in the Advanced Video panel now trigger on the field labels as well as the fields themselves. Fixed updating preset/profile/tune/level settings on changing video encoder. This should resolve some problems with QSV encoding. Fixed tunes and profiles getting set to blank when switching between x264 and x265. Fixed co...NuGet: NuGet 2.8.2: We will be releasing a 2.8.2 version of our own NuGet packages and the NuGet.exe command-line tool. The 2.8.2 release will not include updated VS or WebMatrix extensions. NuGet.Server.Extensions.dll needs to be used alongside NuGet-Signed.exe to provide the NuGet.exe mirror functionality.DNN CMS Platform: 07.03.00 BETA (Not For Production Use): DNN 7.3 release is focused on performance and we have made a variety of changes to improve the run-time characteristics of the platform. End users will notice faster page response time and administrators will appreciate a more responsive user experience, especially on larger scale web sites. This is a BETA release and is NOT recommended for production use. There is no upgrade path offered from this release to the final DNN 7.3 release. Known Issues - The Telerik RAD Controls for ASP.NET AJA...SmartStore.NET - Free ASP.NET MVC Ecommerce Shopping Cart Solution: SmartStore.NET 2.0.2: SmartStore.NET 2.0.2 is primarily a maintenance release for version 2.0.0, which has been released on April 04 2014. It contains several improvements & important fixes. BugfixesIMPORTANT FIX: Memory leak leads to OutOfMemoryException in application after a while Installation fix: some varchar(MAX) columns get created as varchar(4000). Added a migration to fix the column specs. Installation fix: Setup fails with exception Value cannot be null. Parameter name: stream Bugfix for stock iss...Channel9's Absolute Beginner Series: Windows Phone 8.1: Entire source code for Windows Phone 8.1 Absolute Beginner Series.BIDS Helper: BIDS Helper 1.6.6: This BIDS Helper beta release brings support for SQL Server 2014 and SSDTBI for Visual Studio 2013. (Note that SSDTBI for Visual Studio 2013 is currently unavailable to download from Microsoft. We are releasing BIDS Helper support to help those who downloaded it before it became unavailable, and we will recheck BIDS Helper 2014 is compatible after SSDTBI becomes available to download again.) BIDS Helper 2014 Beta Limitations: SQL Server 2014 support for Biml is still in progress, so this bet...Windows Phone IsoStoreSpy (a cool WP8.1 + WP8 Isolated Storage Explorer): IsoStoreSpy WP8.1 3.0.0.0 (Win8 only): 3.0.0.0 + WP8.1 & WP8 device allowed + Local, Roaming or Temp directory Selector for WindowsRuntime apps + Version number in the title :)CS-Script for Notepad++ (C# intellisense and code execution): Release v1.0.24.0: ShortcutMapping panel now allows direct modification of the shortcuts. Custom updater dropped support for MSI installation but it still allows downloading of MSI http://www.csscript.net/npp/codeplex/non_msi_update.pngProDinner - ASP.NET MVC Sample (EF5, N-Tier, jQuery): 8.2: upgrade to mvc 5 upgrade to ASP.net MVC Awesome 4.0, EF 6.1, latest jcrop, Windsor Castle etc. ability to show/hide the dog using tinymce for the feedback page mobile friendly uiASP.net MVC Awesome - jQuery Ajax Helpers: 4.0: version 4.0 ========================== - added InitPopup, InitPopupForm helpers, open initialized popups using awe.open(name, params) - added Tag or Tags for all helpers, usable in mod code - added popup aweclose, aweresize events - popups have api accessible via .data('api'), with methods open, close and destroy - all popups have .awe-popup class - popups can be grouped using .Group(string), only 1 popup in the same group can exist at the same time - added awebeginload event for...ScreenToGif: Release 1.0: What's new: • Small UI tweaks everywhere. • You can add Text, Subtitles and Title Frames. • Processing the gif now takes less time. • Languages: Spanish, Italian and Tamil added. • Single .exe multi language. • Takes less time to apply blur and pixelated efect. • Restart button. • Language picker. (If the user wants to select a diferent language than the system's) • "Encoding Finished" page with a link to open the file. • GreenScreen unchanged pixels to save kilobytes. • "Check for Updates" t...Touchmote: Touchmote 1.0 beta 11: Changes Support for multiple monitor setup Additional settings for analog sticks More reliable pairing Bug fixes and improvementsNew ProjectsADO: copy rightAntilop: Antilop is a professionnal C# business and data access framework.Bit Consulting Business Information Technology Blog: Espacio creado para todos los interesados en intercambiar información, opinar, preguntar todo lo relacionado con los productos ofrecidos por BIT CONSULTING.Black Desert C# emulator(Necroz Project): Development Black Desert emulatorDSLK: bai tap ctdl&gtFreelancerWebSecurity: FreelancerWebSecurityGlobal Machine Access: The project provides an intuitive interface computer control via the command line window. Features: - Login, logout, change password. - Execute commands inHeadTS: An alternative to the HeadJS script loader that provides a more focused, robust, promise-based script management system.How to develop an autodialer / predictive dialer in C#: This project demonstrates how to build a VoIP autodialer in C# in order to be able to make a huge amount of simultaneous calls automatically.html5demo: demo web app.NetPipe: A new piece of software in python that will allow programs to be executed on other computers / servers over a network.Observer Pattern: This project shows how the observer design pattern works.Our wedding: Ruben y Sarahi wedding 19-09-2014SpreadsheetComputations: Good stuffSpurnUI: jQuery based professional ASP.NET Controls for moblieStrategy Pattern: This project shows how the strategy design pattern works.TagIt-MP3: TagIt-MP3 is a free audio file data tagging ID3 format editor, support ID3 tag version, this audio tool can read and write metadata tags for MP3 audio files.TeamProjectDaNang: Ðà N?ng nhóm l?p trình :DThaumcraft4 Research: A small application to help players of Minecraft / Thaumcraft 4 complete their research projects.Visualize and Analyze Demand for Coding Skills, Using WPF: Use data visualization app to figure-out which job skills are most in demand. WPlayer: This project using ffmpeg library, based on Media Foundation. Yammer API SDK: A C# Yammer API SDK?????-?????【??】???????: ????????????????、?????????,??????、??????????????????,???????.??????????,????????。 ??????-??????【??】??????????: ??????????????????,???????、????、????、??????、???????,??????,???????????。?????-?????【??】???????: ??????????1992?,????????????????。??????????????????????。????????????,????，????????！ ?????-?????【??】?????????: ???????????????,???????、???????????,????????,????,?????????,??????,??????! ?????-?????【??】?????????: ???????,??????,?????????????????????,???????????????????????。?????-?????【??】???????: ???????????:?????,??????!???????????????,???????、?????、??????“??”????,????,????!?????-?????【??】???????: ???????????????????,???,??????????、???????????????????。??????,????、????，??????！ ?????-?????【??】???????: ???????????????,????,?????、???、?????,???????,?????,???????????100%。??????！ ?????-?????【??】????? ??: ?????????????????????????,???????????,??????,??????????????...????????。??????！??????-??????【??】??????????: ??????????????????,??:??????,????,????,????,?????,??????????????.??????-??????【??】??????????: ????????????????????,?????????????,???????????.????????????,????????????! ?????-?????【??】???????: ?????????????????????????,???????????,??????,??????????????...????????。??????！????-????【??】????????: ????????????????、?????、?????、????、?????,??????????。????????????????!?????-?????【??】?????????: ??????,??,????????。 ... ??????????????????、??????????????????...?????-?????【??】?????????: ?????????????:????,????,????,???????,????????,??????:????????,?????!??????-??????【??】????????: ?????????????????????、????、????、??????、???????,??????、??????。??????-??????【??】??????????: ????????,??????,?????????????????????,???????????????????????。 ?????-?????【??】???????: ??????????????????????????,??????,???????????,????????????????,????????.??????. ????-????【??】????????: ??????????????,???????、???????????,????????,????,?????????,??????,??????!?????-?????【??】?????: ?????????????????,???????、????、????、??????、???????,??????,???????????。?????-?????【??】???????: ????????????、????、????、??????、????、???????,?????,?????????!?????-?????【??】?????????: ???????????????????????、??????,????、?????、????， ?????????，?????????????！ ??????-??????【??】??????????: ?????????????????????、????、????、??????、???????,??????、??????。?????-??????【??】???????: ?????????,???????????,??????????,????:??,????,???????? ??????????,????????。??????！?????-?????【??】?????????: ???????????????????????、??????,????、?????、????， ?????????，?????????????！?????-?????【??】?????????: ??????????????、????、????、??????、????、???????,?????,?????????!??????-??????【??】??????????: ?????????????????"????,????"???,????????????????????????,??????????????。 ?????-?????【??】???????: ????????????????、?????????,??????、??????????????????,???????.??????????,????????。 ????-????【??】????????: ????????????????????????,???????????????,????????????????！ ?????-?????【??】?????????: ?????,?????????,?????????????。?????????????,?????????,???????。??????-??????【??】??????????: ????????????????,????:????,????,????,??????,?????,???????????????!?????-?????【??】???????: ???????????:?????,??????!???????????????,???????、?????、??????“??”????,????,????! ?????-?????【??】?????????: ?????????????????????????、??????????????,??????????????。?????-?????【??】?????????: ???????????????,????????????,?????????????????,??????,????????!?????-?????【??】?????????: ??????????????????????,????????????,?????、??、????,?????,??????！ ?????-?????【??】???????: ????????????????????????,????,????“???、???、???”?????,?????,?????????????????。??????！ ??????-??????【??】????????: ??????????????????????????、??????????????,??????????????。??????-??????【??】??????????: ?????????????????"????,????"???,????????????????????????,??????????????。????-????【??】????????: ????,?????????,?????????????。?????????????,?????????,???????。 ?????-?????【??】???????: ?????????????????、????、??????、????????,????????????,???????????！?????-?????【??】???????: ???????????????,????????????,?????????????????,??????,????????!?????-?????【??】?????????: ???????????????,????:????,????,????,??????,?????,???????????????! ??????-??????【??】????: ???????????????:?????? ???? ??????,???????,??????,???????。??????-??????【??】????????: ??????????????????、????、??????、????????,????????????,???????????！?????-?????【??】???????: ???????????????????,????????????,????????,???,???????????,????,????。?????,??????.????-????【??】??????: ?????????????????????????,???????????????????????,???????。?????-?????【??】???????: ???????????,????,??????????? ???? ???? ?????????,???,??,?????!

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Finding the heaviest length-constrained path in a weighted Binary Tree

- by Hristo

UPDATE I worked out an algorithm that I think runs in O(n*k) running time. Below is the pseudo-code: routine heaviestKPath( T, k ) // create 2D matrix with n rows and k columns with each element = -8 // we make it size k+1 because the 0th column must be all 0s for a later // function to work properly and simplicity in our algorithm matrix = new array[ T.getVertexCount() ][ k + 1 ] (-8); // set all elements in the first column of this matrix = 0 matrix[ n ][ 0 ] = 0; // fill our matrix by traversing the tree traverseToFillMatrix( T.root, k ); // consider a path that would arc over a node globalMaxWeight = -8; findArcs( T.root, k ); return globalMaxWeight end routine // node = the current node; k = the path length; node.lc = node’s left child; // node.rc = node’s right child; node.idx = node’s index (row) in the matrix; // node.lc.wt/node.rc.wt = weight of the edge to left/right child; routine traverseToFillMatrix( node, k ) if (node == null) return; traverseToFillMatrix(node.lc, k ); // recurse left traverseToFillMatrix(node.rc, k ); // recurse right // in the case that a left/right child doesn’t exist, or both, // let’s assume the code is smart enough to handle these cases matrix[ node.idx ][ 1 ] = max( node.lc.wt, node.rc.wt ); for i = 2 to k { // max returns the heavier of the 2 paths matrix[node.idx][i] = max( matrix[node.lc.idx][i-1] + node.lc.wt, matrix[node.rc.idx][i-1] + node.rc.wt); } end routine // node = the current node, k = the path length routine findArcs( node, k ) if (node == null) return; nodeMax = matrix[node.idx][k]; longPath = path[node.idx][k]; i = 1; j = k-1; while ( i+j == k AND i < k ) { left = node.lc.wt + matrix[node.lc.idx][i-1]; right = node.rc.wt + matrix[node.rc.idx][j-1]; if ( left + right > nodeMax ) { nodeMax = left + right; } i++; j--; } // if this node’s max weight is larger than the global max weight, update if ( globalMaxWeight < nodeMax ) { globalMaxWeight = nodeMax; } findArcs( node.lc, k ); // recurse left findArcs( node.rc, k ); // recurse right end routine Let me know what you think. Feedback is welcome. I think have come up with two naive algorithms that find the heaviest length-constrained path in a weighted Binary Tree. Firstly, the description of the algorithm is as follows: given an n-vertex Binary Tree with weighted edges and some value k, find the heaviest path of length k. For both algorithms, I'll need a reference to all vertices so I'll just do a simple traversal of the Tree to have a reference to all vertices, with each vertex having a reference to its left, right, and parent nodes in the tree. Algorithm 1 For this algorithm, I'm basically planning on running DFS from each node in the Tree, with consideration to the fixed path length. In addition, since the path I'm looking for has the potential of going from left subtree to root to right subtree, I will have to consider 3 choices at each node. But this will result in a O(n*3^k) algorithm and I don't like that. Algorithm 2 I'm essentially thinking about using a modified version of Dijkstra's Algorithm in order to consider a fixed path length. Since I'm looking for heaviest and Dijkstra's Algorithm finds the lightest, I'm planning on negating all edge weights before starting the traversal. Actually... this doesn't make sense since I'd have to run Dijkstra's on each node and that doesn't seem very efficient much better than the above algorithm. So I guess my main questions are several. Firstly, do the algorithms I've described above solve the problem at hand? I'm not totally certain the Dijkstra's version will work as Dijkstra's is meant for positive edge values. Now, I am sure there exist more clever/efficient algorithms for this... what is a better algorithm? I've read about "Using spine decompositions to efficiently solve the length-constrained heaviest path problem for trees" but that is really complicated and I don't understand it at all. Are there other algorithms that tackle this problem, maybe not as efficiently as spine decomposition but easier to understand? Thanks.

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CodePlex Daily Summary for Friday, February 18, 2011

CodePlex Daily Summary for Friday, February 18, 2011Popular ReleasesCatel - WPF and Silverlight MVVM library: 1.2: Catel history ============= (+) Added (*) Changed (-) Removed (x) Error / bug (fix) For more information about issues or new feature requests, please visit: http://catel.codeplex.com =========== Version 1.2 =========== Release date: ============= 2011/02/17 Added/fixed: ============ (+) DataObjectBase now supports Isolated Storage out of the box: Person.Save(myStream) stores a whole object graph in Silverlight (+) DataObjectBase can now be converted to Json via Person.ToJson(); (+)...Game Files Open - Map Editor: Game Files Open - Map Editor v1.0.0.0 Beta: Game Files Open - Map Editor beta v1.0.0.0Image.Viewer: 2011: First version of 2011Silverlight Toolkit: Silverlight for Windows Phone Toolkit - Feb 2011: Silverlight for Windows Phone Toolkit OverviewSilverlight for Windows Phone Toolkit offers developers additional controls for Windows Phone application development, designed to match the rich user experience of the Windows Phone 7. Suggestions? Features? Questions? Ask questions in the Create.msdn.com forum. Add bugs or feature requests to the Issue Tracker. Help us shape the Silverlight Toolkit with your feedback! Please clearly indicate that the work items and issues are for the phone t...VsTortoise - a TortoiseSVN add-in for Microsoft Visual Studio: VsTortoise Build 29 Beta: Note: This release does not work with custom VsTortoise toolbars. These get removed every time when you shutdown Visual Studio. (#7940) Build 29 (beta)New: Added VsTortoise Solution Explorer integration for Web Project Folder, Web Folder and Web Item. Fix: TortoiseProc was called with invalid parameters, when using TSVN 1.4.x or older #7338 (thanks psifive) Fix: Add-in does not work, when "TortoiseSVN/bin" is not added to PATH environment variable #7357 Fix: Missing error message when ...Sense/Net CMS - Enterprise Content Management: SenseNet 6.0.3 Community Edition: Sense/Net 6.0.3 Community Edition We are happy to introduce you the latest version of Sense/Net with integrated ECM Workflow capabilities! In the past weeks we have been working hard to migrate the product to .Net 4 and include a workflow framework in Sense/Net built upon Windows Workflow Foundation 4. This brand new feature enables developers to define and develop workflows, and supports users when building and setting up complicated business processes involving content creation and response...thinktecture WSCF.blue: WSCF.blue V1 Update (1.0.11): Features Added a new option that allows properties on data contract types to be marked as virtual. Bug Fixes Fixed a bug caused by certain project properties not being available on Web Service Software Factory projects. Fixed a bug that could result in the WrapperName value of the MessageContractAttribute being incorrect when the Adjust Casing option is used. The menu item code now caters for CommandBar instances that are not available. For example the Web Item CommandBar does not exist ...Document.Editor: 2011.5: Whats new for Document.Editor 2011.5: New export to email New export to image New document background color Improved Tooltips Minor Bug Fix's, improvements and speed upsTerminals: Version 2 - RC1: The "Clean Install" will overwrite your log4net configuration (if you have one). If you run in a Portable Environment, you can use the "Clean Install" and target your portable folder. Tested and it works fine. Changes for this release: Re-worked on the Toolstip settings are done, just to avoid the vs.net clash with auto-generating files for .settings files. renamed it to .settings.config Packged both log4net and ToolStripSettings files into the installer Upgraded the version inform...AllNewsManager.NET: AllNewsManager.NET 1.3: AllNewsManager.NET 1.3. This new version provide several new features, improvements and bug fixes. Some new features: Online Users. Avatars. Copy function (to create a new article from another one). SEO improvements (friendly urls). New admin buttons. And more...Facebook Graph Toolkit: Facebook Graph Toolkit 0.8: Version 0.8 (15 Feb 2011)moved to Beta stage publish photo feature "email" field of User object added new Graph Api object: Group, Event new Graph Api connection: likes, groups, eventsDJME - The jQuery extensions for ASP.NET MVC: DJME2 -The jQuery extensions for ASP.NET MVC beta2: The source code and runtime library for DJME2. For more product info you can goto http://www.dotnetage.com/djme.html What is new ?The Grid extension added The ModelBinder added which helping you create Bindable data Action. The DnaFor() control factory added that enabled Model bindable extensions. Enhance the ListBox , ComboBox data binding.Jint - Javascript Interpreter for .NET: Jint - 0.9.0: New CLR interoperability features Many bugfixesBuild Version Increment Add-In Visual Studio: Build Version Increment v2.4.11046.2045: v2.4.11046.2045 Fixes and/or Improvements:Major: Added complete support for VC projects including .vcxproj & .vcproj. All padding issues fixed. A project's assembly versions are only changed if the project has been modified. Minor Order of versioning style values is now according to their respective positions in the attributes i.e. Major, Minor, Build, Revision. Fixed issue with global variable storage with some projects. Fixed issue where if a project item's file does not exist, a ...Coding4Fun Tools: Coding4Fun.Phone.Toolkit v1.1: Coding4Fun.Phone.Toolkit v1.1 release. Bug fixes and minor feature requests addedTV4Home - The all-in-one TV solution!: 0.1.0.0 Preview: This is the beta preview release of the TV4Home software.Finestra Virtual Desktops: 1.2: Fixes a few minor issues with 1.1 including the broken per-desktop backgrounds Further improves the speed of switching desktops A few UI performance improvements Added donations linksNuGet: NuGet 1.1: NuGet is a free, open source developer focused package management system for the .NET platform intent on simplifying the process of incorporating third party libraries into a .NET application during development. This release is a Visual Studio 2010 extension and contains the the Package Manager Console and the Add Package Dialog. The URL to the package OData feed is: http://go.microsoft.com/fwlink/?LinkID=206669 To see the list of issues fixed in this release, visit this our issues listEnhSim: EnhSim 2.4.0: 2.4.0This release supports WoW patch 4.06 at level 85 To use this release, you must have the Microsoft Visual C++ 2010 Redistributable Package installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=A7B7A05E-6DE6-4D3A-A423-37BF0912DB84 To use the GUI you must have the .NET 4.0 Framework installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992 Changes since 2.3.0 - Upd...PDF Rider: PDF Rider 0.5.1: Changes from the previous version * Use dynamic layout to better fit text in other languages * Includes French and Spanish localizations Prerequisites * Microsoft Windows Operating Systems (XP - Vista - 7) * Microsoft .NET Framework 3.5 runtime * A PDF rendering software (i.e. Adobe Reader) that can be opened inside Internet Explorer. Installation instructionsChoose one of the following methods: 1. Download and run the "pdfRider0.5.1-setup.exe" (reccomended) 2. Down...New ProjectsAbstractSpoon: Development Code by AbstractSpoonBetchRenamer: ????????ChromeTabControl: I want to create wpf tab control. It will have same behavior that chrome.CLASonline: CS 307 Software Engineering - Purdue University A web based social and collaborative learning system.ElearningProject: ELearning TutorialEPICS .NET - Experimental Physics and Industrial Control System for .NET: EPICS .NET is the Experimental Physics and Industrial Control System for .NET Framework 4.0 and above. Written in C#, this control toolkit consists of three sub projects: * EPICS .NET Library, * Virtual Accelerator: Demonstrates full capabilities of the library, * EPICS SimulatorException Manager: Having trouble with unhandled exceptions? Exception Manager will catch these exceptions for you and log them, and then continue running the program. You can choose whether or not to display a dialog box. Only invoked when *not* running from the debugger (Run without Debugging)FileTransferTool: The program is a file transfer client, it monitor one or several local directories, verify,ftp and backup files found to the directory or ftp server you assign. the program is developed by c# + .framework 2.0(to support previous windows version). Hope it can help.httpdSharp: Simple multi-threaded console http server written in C# and .NET 2.0. Simple configuration of wwwroot folder, port and mime-types served. Useful for serving static content when you are in a hurry.Image.Viewer: Basic Ribbon based image viewer for Windows XP, Vista and Windows 7.Imtihan: Imtihan is an online assessment system (OAS).Iphone: Project about I-PhotoKunalPishewsccsemb: KunalPishewsccsembMAT04 Integrationsprojekt - Stadt- und Sehenswürdigkeitenführer Bern: Für die Stadt Bern soll ein "Stadt- und Sehenswürdigkeitenführer" für Smartphones implementiert werden. Touristen und Besuchern sollen die Sehenswürdigkeiten von Bern näher gebracht, sowie das Zurechtfinden in der Altstadt erleichtert werden.MediaBrowser Silverlight: MediaBrowser Silverlight is a small application designed with Silverlight in an educational purpose. This application allows you to consult a series of media (Movies, Albums, Images, Books) and to administer them.MovieCalc: A small tool to calc the bitrate of a movie with given audio bitrate and destination size of the movie (divx, xvid)MPC Pattern for Microsoft Silverlight 4.0: If you have struggled with MVVM in Silverlight line of business applications and you want a good framework for building an application, MPC is for you. MPC is a Model, ViewModel, Presenter and Controller pattern enhanced with XAML defined States, Actions, and Async WCF.News Man: Rss feed News readerOpenQuestions: OpenQuestions is the leading open source source for exam simulators. Main features: * All type of questions supported (single choice, multiple choice, open answers, matching, fill the gaps, etc) * Customisable appearance (look and feel) with themes. * Multi-lingual support.Ordered images loading: Ordered image loading controls enables you to load images on pages in order you specify. It is nice for sites with lot of images where you want to control which images should be loaded first. It is developed using ASP.NET AJAX Extensions and jQuery.Over the fence: Share your gardening tips. This is a community site for gardeners to share their experiences. Discuss your successes and failures. Swap tips. Which plants grow well in your soil? Where is the best place to source plants? What are your favourites?Phoenix iBooking: Phoenix iBooking is an appointment management system. For salons, sports centers etc. It was originally written in VB .NET as a salon booking and till system. This project will see the conversion to C# .NET 4 and removal of the till functionality.PointlessBends: Simply move the four points around the white area and waste time! Yes, that’s right, its pointless!PRISMvvM: MvvM guidance and framework built on top of the PRISM framework. Makes it easier for developers to properly utilize PRISM to achieve best practices in creating a Silverlight project with MVVM. Sponsored and written by: http://www.architectinginnovation.comrsvp: Projectwork on the IT University in Copenhagen, building a survey system.SharePoint 2010 Silverlight Web Part JavaScript Bridge: This is a project template containing a number of base classes and JavaScript which allows SharePoint 2010 Silverlight web parts to communicate with each other inside the browser. It provides Silverlight web parts with the functionality normal web parts get from interfaces.StatlightTeamBuild: StatlightTeamBuild is a build activity plugin for TFS build 2010. The unittest results, generated by statlight, are processed and publish to TFS. After which, the results are shown in your build summary. TFS to TeamCity Build Notification Plugin: Have you ever wanted to turn VCS polling off? TFS to TeamCity Build Notification Plugin is a tool that will initiate a build request when your source code is checked in. The only configuration includes deploying the notification website and supplying your VCS roots to notify .tipolog: tipologTower Defense 3D with C# and XNA: A classical Tower Defense but in 3D. Developped in C# and using XNA, this game is aimed to be released on both Windows and Xbox 360. This project is a part of a course for the 1st y of IT MASTER in Besancon, France.Utility4Net: some base class such as xml,string,data,secerity,web... etc.. under Microsoft.NET Framework 4.0Windows Azure Starter Kit for Java: This starter kit was designed to work as a simple command line build tool or in the Eclipse integrated development environment (IDE) to help Java developers deploy their applications to the Windows Azure cloud.WSCCSemesterB: Web Scripting Semester BXaml Physics: Xaml Physics makes it possible to make a physics simulation with only xaml code. It is a wrapper around the Farseer Physics Engine.

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jQuery Form Processing With PHP to MYSQL Database Using $.ajax Request

- by FrustratedUser

Question: How can I process a form using jQuery and the $.ajax request so that the data is passed to a script which writes it to a database? Problem: I have a simple email signup form that when processed, adds the email along with the current date to a table in a MySQL database. Processing the form without jQuery works as intended, adding the email and date. With jQuery, the form submits successfully and returns the success message. However, no data is added to the database. Any insight would be greatly appreciated!  <?php // DB info $dbhost = '#'; $dbuser = '#'; $dbpass = '#'; $dbname = '#'; // Open connection to db $conn = mysql_connect($dbhost, $dbuser, $dbpass) or die ('Error connecting to mysql'); mysql_select_db($dbname); // Form variables $email = $_POST['email']; $submitted = $_POST['submitted']; // Clean up function cleanData($str) { $str = trim($str); $str = strip_tags($str); $str = strtolower($str); return $str; } $email = cleanData($email); $error = ""; if(isset($submitted)) { if($email == '') { $error .= '<p class="error">Please enter your email address.</p>' . "\n"; } else if (!eregi("^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$", $email)) { $error .= '<p class="error">Please enter a valid email address.</p>' . "\n"; } if(!$error){ echo '<p id="signup-success-nojs">You have successfully subscribed!</p>'; // Add to database $add_email = "INSERT INTO subscribers (email,date) VALUES ('$email',CURDATE())"; mysql_query($add_email) or die(mysql_error()); }else{ echo $error; } } ?>  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Sample</title> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ // Email Signup $("form#newsletter").submit(function() { var dataStr = $("#newsletter").serialize(); alert(dataStr); $.ajax({ type: "POST", url: "process.php", data: dataStr, success: function(del){ $('form#newsletter').hide(); $('#signup-success').fadeIn(); } }); return false; }); }); </script> <style type="text/css"> #email { margin-right:2px; padding:5px; width:145px; border-top:1px solid #ccc; border-left:1px solid #ccc; border-right:1px solid #eee; border-bottom:1px solid #eee; font-size:14px; color:#9e9e9e; } #signup-success { margin-bottom:20px; padding-bottom:10px; background:url(../img/css/divider-dots.gif) repeat-x 0 100%; display:none; } #signup-success p, #signup-success-nojs { padding:5px; background:#fff; border:1px solid #dedede; text-align:center; font-weight:bold; color:#3d7da5; } </style> </head> <body> <?php include('process.php'); ?> <form id="newsletter" class="divider" name="newsletter" method="post" action=""> <fieldset> <input id="email" type="text" name="email" /> <input id="submit-button" type="image" src="<?php echo $base_url; ?>/assets/img/css/signup.gif" alt=" SIGNUP " /> <input id="submitted" type="hidden" name="submitted" value="true" /> </fieldset> </form> <div id="signup-success"><p>You have successfully subscribed!</p></div> </body> </html>

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Can't get my head around background workers in .NET

- by Connel

I have wrote an application that syncs two folders together. The problem with the program is that it stops responding whilst copying files. A quick search of stack-overflow told me I need to use something called a background worker. I have read a few pages on the net about this but find it really hard to understand as I'm pretty new to programming. Below is the code for my application - how can I simply put all of the File.Copy(....) commands into their own background worker (if that's even how it works)? Below is the code for the button click event that runs the sub procedure and the sub procedure I wish to use a background worker on all the File.Copy lines. Button event: protected virtual void OnBtnSyncClicked (object sender, System.EventArgs e) { //sets running boolean to true booRunning=true; //sets progress bar to 0 prgProgressBar.Fraction = 0; //resets values used by progressbar dblCurrentStatus = 0; dblFolderSize = 0; //tests if user has entered the same folder for both target and destination if (fchDestination.CurrentFolder == fchTarget.CurrentFolder) { //creates message box MessageDialog msdSame = new MessageDialog(this, DialogFlags.Modal, MessageType.Error, ButtonsType.Close, "You cannot sync two folders that are the same"); //sets message box title msdSame.Title="Error"; //sets respone type ResponseType response = (ResponseType) msdSame.Run(); //if user clicks on close button or closes window then close message box if (response == ResponseType.Close || response == ResponseType.DeleteEvent) { msdSame.Destroy(); } return; } //tests if user has entered a target folder that is an extension of the destination folder // or if user has entered a desatination folder that is an extension of the target folder if (fchTarget.CurrentFolder.StartsWith(fchDestination.CurrentFolder) || fchDestination.CurrentFolder.StartsWith(fchTarget.CurrentFolder)) { //creates message box MessageDialog msdContains = new MessageDialog(this, DialogFlags.Modal, MessageType.Error, ButtonsType.Close, "You cannot sync a folder with one of its parent folders"); //sets message box title msdContains.Title="Error"; //sets respone type and runs message box ResponseType response = (ResponseType) msdContains.Run(); //if user clicks on close button or closes window then close message box if (response == ResponseType.Close || response == ResponseType.DeleteEvent) { msdContains.Destroy(); } return; } //gets folder size of target folder FileSizeOfTarget(fchTarget.CurrentFolder); //gets folder size of destination folder FileSizeOfDestination(fchDestination.CurrentFolder); //runs SyncTarget procedure SyncTarget(fchTarget.CurrentFolder); //runs SyncDestination procedure SyncDestination(fchDestination.CurrentFolder); //informs user process is complete prgProgressBar.Text = "Finished"; //sets running bool to false booRunning = false; } Sync sub-procedure: protected void SyncTarget (string strCurrentDirectory) { //string array of all the directories in directory string[] staAllDirectories = Directory.GetDirectories(strCurrentDirectory); //string array of all the files in directory string[] staAllFiles = Directory.GetFiles(strCurrentDirectory); //loop over each file in directory foreach (string strFile in staAllFiles) { //string of just the file's name and not its path string strFileName = System.IO.Path.GetFileName(strFile); //string containing directory in target folder string strDirectoryInsideTarget = System.IO.Path.GetDirectoryName(strFile).Substring(fchTarget.CurrentFolder.Length); //inform user as to what file is being copied prgProgressBar.Text="Syncing " + strFile; //tests if file does not exist in destination folder if (!File.Exists(fchDestination.CurrentFolder + "/" + strDirectoryInsideTarget + "/" + strFileName)) { //if file does not exist copy it to destination folder, the true below means overwrite if file already exists File.Copy (strFile, fchDestination.CurrentFolder + "/" + strDirectoryInsideTarget + "/" + strFileName, true); } //tests if file does exist in destination folder if (File.Exists(fchDestination.CurrentFolder + "/" + strDirectoryInsideTarget + "/" + strFileName)) { //long (number) that contains date of last write time of target file long lngTargetFileDate = File.GetLastWriteTime(strFile).ToFileTime(); //long (number) that contains date of last write time of destination file long lngDestinationFileDate = File.GetLastWriteTime(fchDestination.CurrentFolder + "/" + strDirectoryInsideTarget + "/" + strFileName).ToFileTime(); //tests if target file is newer than destination file if (lngTargetFileDate > lngDestinationFileDate) { //if it is newer then copy file from target folder to destination folder File.Copy (strFile, fchDestination.CurrentFolder + "/" + strDirectoryInsideTarget + "/" + strFileName, true); } } //gets current file size FileInfo FileSize = new FileInfo(strFile); //sets file's filesize to dblCurrentStatus and adds it to current total of files dblCurrentStatus = dblCurrentStatus + FileSize.Length; double dblPercentage = dblCurrentStatus/dblFolderSize; prgProgressBar.Fraction = dblPercentage; } //loop over each folder in target folder foreach (string strDirectory in staAllDirectories) { //string containing directories inside target folder but not any higher directories string strDirectoryInsideTarget = strDirectory.Substring(fchTarget.CurrentFolder.Length); //tests if directory does not exist inside destination folder if (!Directory.Exists(fchDestination.CurrentFolder + "/" + strDirectoryInsideTarget)) { //it directory does not exisit create it Directory.CreateDirectory(fchDestination.CurrentFolder + "/" + strDirectoryInsideTarget); } //run sync on all files in directory SyncTarget(strDirectory); } } Any help will be greatly appreciated as after this the program will pretty much be finished :D

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Getting a NullPointerException at seemingly random intervals, not sure why

- by Miles

I'm running an example from a Kinect library for Processing (http://www.shiffman.net/2010/11/14/kinect-and-processing/) and sometimes get a NullPointerException pointing to this line: int rawDepth = depth[offset]; The depth array is created in this line: int[] depth = kinect.getRawDepth(); I'm not exactly sure what a NullPointerException is, and much googling hasn't really helped. It seems odd to me that the code compiles 70% of the time and returns the error unpredictably. Could the hardware itself be affecting it? Here's the whole example if it helps: // Daniel Shiffman // Kinect Point Cloud example // http://www.shiffman.net // https://github.com/shiffman/libfreenect/tree/master/wrappers/java/processing import org.openkinect.*; import org.openkinect.processing.*; // Kinect Library object Kinect kinect; float a = 0; // Size of kinect image int w = 640; int h = 480; // We'll use a lookup table so that we don't have to repeat the math over and over float[] depthLookUp = new float[2048]; void setup() { size(800,600,P3D); kinect = new Kinect(this); kinect.start(); kinect.enableDepth(true); // We don't need the grayscale image in this example // so this makes it more efficient kinect.processDepthImage(false); // Lookup table for all possible depth values (0 - 2047) for (int i = 0; i < depthLookUp.length; i++) { depthLookUp[i] = rawDepthToMeters(i); } } void draw() { background(0); fill(255); textMode(SCREEN); text("Kinect FR: " + (int)kinect.getDepthFPS() + "\nProcessing FR: " + (int)frameRate,10,16); // Get the raw depth as array of integers int[] depth = kinect.getRawDepth(); // We're just going to calculate and draw every 4th pixel (equivalent of 160x120) int skip = 4; // Translate and rotate translate(width/2,height/2,-50); rotateY(a); for(int x=0; x<w; x+=skip) { for(int y=0; y<h; y+=skip) { int offset = x+y*w; // Convert kinect data to world xyz coordinate int rawDepth = depth[offset]; PVector v = depthToWorld(x,y,rawDepth); stroke(255); pushMatrix(); // Scale up by 200 float factor = 200; translate(v.x*factor,v.y*factor,factor-v.z*factor); // Draw a point point(0,0); popMatrix(); } } // Rotate a += 0.015f; } // These functions come from: http://graphics.stanford.edu/~mdfisher/Kinect.html float rawDepthToMeters(int depthValue) { if (depthValue < 2047) { return (float)(1.0 / ((double)(depthValue) * -0.0030711016 + 3.3309495161)); } return 0.0f; } PVector depthToWorld(int x, int y, int depthValue) { final double fx_d = 1.0 / 5.9421434211923247e+02; final double fy_d = 1.0 / 5.9104053696870778e+02; final double cx_d = 3.3930780975300314e+02; final double cy_d = 2.4273913761751615e+02; PVector result = new PVector(); double depth = depthLookUp[depthValue];//rawDepthToMeters(depthValue); result.x = (float)((x - cx_d) * depth * fx_d); result.y = (float)((y - cy_d) * depth * fy_d); result.z = (float)(depth); return result; } void stop() { kinect.quit(); super.stop(); } And here are the errors: processing.app.debug.RunnerException: NullPointerException at processing.app.Sketch.placeException(Sketch.java:1543) at processing.app.debug.Runner.findException(Runner.java:583) at processing.app.debug.Runner.reportException(Runner.java:558) at processing.app.debug.Runner.exception(Runner.java:498) at processing.app.debug.EventThread.exceptionEvent(EventThread.java:367) at processing.app.debug.EventThread.handleEvent(EventThread.java:255) at processing.app.debug.EventThread.run(EventThread.java:89) Exception in thread "Animation Thread" java.lang.NullPointerException at org.openkinect.processing.Kinect.enableDepth(Kinect.java:70) at PointCloud.setup(PointCloud.java:48) at processing.core.PApplet.handleDraw(PApplet.java:1583) at processing.core.PApplet.run(PApplet.java:1503) at java.lang.Thread.run(Thread.java:637)

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Js/Jquery bind Datatable or Datalist

- by Robin Rieger

Scenario I have a input box for post codes. When you put in a postcode it makes a call to a web service and gets all the suburb names back and binds them to a list, like an input dropdown list. This works when I return a List<string> from the web service for just the names. No problem. The problem arises when I go to save the values to the db. When it gets saved I cannot save the name of the suburb in the suburb column in the db. I have to save the id of that suburb for the foreign key constraint. So then I changed the List<> thing slighty and cheated and returned the following. <ArrayOfString> <string>8213</string> <string>BROOKFIELD</string> <string>8214</string> <string>CHAPEL HILL</string> <string>8215</string> <string>FIG TREE POCKET</string> etc.... The reason for this is so I can have the value of the item in the drop down as the id and hence can save that in the code behind on save. To do this, I did the following: $(result).each(function (index, value) { var suburbname; var pattern = new RegExp('[0-9*]'); var m = pattern.exec(value); if (m == null) { suburbname = value var o = new Option(suburbname, suburbid); /// jquerify the DOM object 'o' so we can use the html method $(o).html(suburbname); $(document.getElementById('<%= suburb.ClientID %>')).append($("<option></option>") .attr("value", suburbid) .text(suburbname)); } else { suburbid = value } That works as well... the drop down only has name and the value for those is the number The problem....? I am making assumptions above which I don't like... I.e. that the name never has a number it, that the web service will always return the id first to set the id before running the add to the dropdown for the first time. It just feels wrong.... :S (thoughts?) So, if I change the web service to return a datatable, to out the following (which is what the whole query returns): <Suburbs diffgr:id="Suburbs1" msdata:rowOrder="0"> <SuburbID>8213</SuburbID> <SuburbName>BROOKFIELD</SuburbName> <StateID>4</StateID> <StateCode>07</StateCode> <CountryCode>61</CountryCode> <TimeZones>10.00</TimeZones> <Postcode>4069</Postcode> </Suburbs> Is there a way of acheiving the same as above in js/jquery. So when the user inputs the postcode the webservice returns the datatable and then binds it to the select with the SuburbID going into the value and the name going into the text??? Any other ways I could return the data from the web service to solve this? Note: essentially I need the option to look like this: <option value="8213">BROOKFIELD</option> I also thought I could make a second call to get just the id on the bind of the text... but I kind of want to only make one call.... Thanks in adance, Cheers Robin .net, C#, js, jquery, web service..... Solution with guidance from Billy The adding to the select using the other method below did not work, but my original way did once I had the correct variables so just used that.... The service returns: <ArrayOfMyClass> <MyClass> <ID>8213</ID> <Name>BROOKFIELD</Name> </MyClass> ... etc The js is: (note: it is onchange of the postcode input box. it runs a web service and then on success runs the following) function OnCompleted(result) { var _suburbs = result; var i = 0; $(_suburbs).each(function () { var SuburbName = _suburbs[i].Name; var SuburbID = _suburbs[i].ID; $(document.getElementById('<%= suburb.ClientID %>')).append($("<option></option>") .attr("value", SuburbID) .text(SuburbName)); i = i + 1; });

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CodePlex Daily Summary for Thursday, May 15, 2014

CodePlex Daily Summary for Thursday, May 15, 2014Popular ReleasesVisualizers: Visualizer: This dll is the core of the project just copy and paste it in the following folder %Microsoft Visual Studio%\Common7\Packages\Debugger\Visualizers where %Microsoft Visual Studio% is the Visual studio installation folderQuickMon: Version 3.10: Adding the ability to see 'history' of Collector states (including details of errors or warnings at that time). The history size is configurable (default is switched off) and the Windows Service completely ignores keeping history (no UI or user to access it anyway). The Collector stats window now displays this history plus multiple collector stats windows can be opened at the same time. Additionally fixed a bug in the event log collector that reported an 'Error' state when an 'out of bounds' ...xFunc: xFunc 2.15.4: Fixed bug in Processor.csTFS Planning and Disaster Recovery Avoidance Guide: v1.4.BETA - TFS, DR and Azure IaaS Planning Guides: Welcome to the TFS Planning and DR Avoidance Guidance What is new? A new crisper, more compact style, which is easier to consume on multiple devices without sacrificing any content. Also included are the new TFS on Azure IaaS guide and supplementary guides. Note Capacity planning workbook and posters are included in the Everything Zip package. Quality-Bar Detail Documentation has been reviewed by Visual Studio ALM Rangers Documentation has been through an independent technical review ...WinAudit: WinAudit Freeware v3.0: WinAudit.exe v3.0 MD5: 88750CCF49FF7418199B2645755830FA Known Issues: 1. Report creation can be very slow when right-to-left (Hebrew) characters are present. 2. Emsisoft Anti-Malware may stop and/or quarantine WinAudit. This happens when WinAudit attempts to obtain a list if running programmes. You will need to set an exception rule in Emsisoft to allow WinAudit to run.MVCwCMS - ASP.NET MVC CMS: MVCwCMS 2.2.2: Updated CKFinder config. For the installation instructions visit the documentation page: https://mvcwcms.codeplex.com/documentationTerraMap (Terraria World Map Viewer): TerraMap 1.0.4: Added support for the new Terraria v1.2.4 update. New items, walls, and tiles Fixed Issue 35206: Hightlight/Find doesn't work for Demon Altars Fixed finding Demon Hearts/Shadow Orbs Added ability to find Enchanted Swords (in the stone) and Water Bolt books Fixed installer not uninstalling older versions The setup file will make sure .NET 4 is installed, install TerraMap, create desktop and start menu shortcuts, add a .wld file association, and launch TerraMap. If you prefer the zip ...WPF Localization Extension: v2.2.1: Issue #9277 Issue #9292 Issue #9311 Issue #9312 Issue #9313 Issue #9314CtrlAltStudio Viewer: CtrlAltStudio Viewer 1.2.1.41167 Release: This release of the CtrlAltStudio Viewer includes the following significant features: Oculus Rift support. Stereoscopic 3D display support. Variable walking / flying speed. Xbox 360 Controller support. Kinect for Windows support. Based on Firestorm viewer 4.6.5 codebase. For more details, see the release notes linked to below. Release notes: http://ctrlaltstudio.com/viewer/release-notes/1-2-1-41167-release Support info: http://ctrlaltstudio.com/viewer/support Privacy policy: http:/...ExtJS based ASP.NET Controls: FineUI v4.0.6: FineUI（???） ?? ExtJS ??? ASP.NET ??? FineUI??? ?? No JavaScript，No CSS，No UpdatePanel，No ViewState，No WebServices ??????? ?????? IE 8.0+、Chrome、Firefox、Opera、Safari ???? Apache License v2.0 ?：ExtJS ?? GPL v3 ?????(http://www.sencha.com/license) ???? ??：http://fineui.com/ ??：http://fineui.com/bbs/ ??：http://fineui.com/demo/ ??：http://fineui.com/doc/ ??：http://fineui.codeplex.com/ FineUI ???? ExtJS ????????，???? ExtJS ?，?????： 1. ????? FineUI ? ExtJS ? http://fineui.com/bbs/forum.ph...Office App Model Samples: Office App Model Samples v2.0: Office App Model Samples v2.0Readable Passphrase Generator: KeePass Plugin 0.13.0: Version 0.13.0 Added "mutators" which add uppercase and numbers to passphrases (to help complying with upper, lower, number complexity rules). Additional API methods which help consuming the generator from 3rd party c# projects. 13,160 words in the default dictionary (~600 more than previous release).CS-Script for Notepad++ (C# intellisense and code execution): Release v1.0.25.0: Release v1.0.25.0 MemberInfo/MethodInfo popup is now positioned properly to fit the screen In MethodInfo popup method signatures are word-wrapped Implemented Debug text value visualizer Pining sub-values from Watch PanelWrapper for the PAYMILL API: Paymill API Wrapper: Add Description in PreauthorizationHow to develop an autodialer / predictive dialer in C#: VoIP AutoDialer in C Sharp: This is the downloadable source code for this example project that is intended to help you in developing your own VoIP autodialer application in C#.R.NET: R.NET 1.5.12: R.NET 1.5.12 is a beta release towards R.NET 1.6. You are encouraged to use 1.5.12 now and give feedback. See the documentation for setup and usage instructions. Main changes for R.NET 1.5.12: The C stack limit was not disabled on Windows. For reasons possibly peculiar to R, this means that non-concurrent access to R from multiple threads was not stable. This is now fixed, with the fix validated with a unit test. Thanks to Odugen, skyguy94, and previously others (evolvedmicrobe, tomasp) fo...SEToolbox: SEToolbox 01.029.006 Release 1: Fix to allow keyboard search on load dialog. (type the first few letters of your save) Fixed check for new release. Changed the way ship details are loaded to alleviate load time for worlds with very large ships (100,000+ blocks). Fixed Image importer, was incorrectly listing 'Asteroid' as import option. Minor changes to menus (text and appearance) for clarity and OS consistency. Added in reading of world palette for color dialog editor. WIP on subsystem editor. Can now multiselec...Thaumcraft4 Research: Alpha 2 release, lots of awesome improvements: Performance inprovements asynchronous running of the search Search result-cap ( usefull for long routes, it wont try to find 3000 results ) statistics addedTiny Wifi Host: Tiny Wifi Host 3.0.0.0: Tiny Wifi Hotspot Creator (Portable) v3 size: 50KB-140KB New Features: Friendly name for connected devices instead of Mac-Address (Double click selected device to enter friendly name) Saves device names to devices.xml Better error reporting+solutions Warning sound when number of connected devices exceed a certain number. (useful when only certain number of devices must be connected at a time) Many Bug Fixes. NoAudio files does not include connect, disconnect and warning audio to dec...Media Companion: Media Companion MC3.597b: Thank you for being patient, againThere are a number of fixes in place with this release. and some new features added. Most are self explanatory, so check out the options in Preferences. Couple of new Features:* Movie - Allow save Title and Sort Title in Title Case format. * Movie - Allow save fanart.jpg if movie in folder. * TV - display episode source. Get episode source from episode filename. Fixed:* Movie - Added Fill Tags from plot keywords to Batch Rescraper. * Movie - Fixed TMDB s...New ProjectsBLADE View Engine - An independent RAZOR alternative: An alternative parser and view engine to Asp.net Razor that does not depend on Asp.net or .NET 4.5BPL++: A basic object orientated programming language built upon a virtual machine using C#Caedisi - A Cellular Automata Editor and Simulator for Network Decontamination: A research tool that explores the use of cellular automata in order to decontaminate a network attacked or infected by a virus. Cosmos Software Distrobution 1.0: No content until project released!ETCQuality: ETC QUALITY STAT SYSTEM. ????????????，??????????????。F.A.Q.: F.A.Q. project about Frequently asked questions. Help Viewer Redirector: Enables use of Help Viewer 2.0 or 2.1 with SQL Server instead of Help Viewer 1.0Jet.Payment.Cielo: Projeto contém integração com o serviço e-commerce Cielo, desenvolvido em C#. Criamos esse Helper para nossa própria necessidade. Nos ajude a melhorá-lo.Learning with Pati: Learning Javascript with PatiLeRenard: LeRenard is a collection of solutions (from core helper, extension methods) to libraries, all written in C# to help build applications.MCMP.NET: MCMP.NET allows ASP.NET applications to be added as contexts using mod_cluster.PowerShell Deployment Automation Framework: This project contains resources related to my blog at www.powershellcoach.compravda-f: ??????????? ? ?????? ??? ?????????? ??????sdir: Colorful, sorted and optionally rich directory enumeration for Windows.SienSchoofsProject: school project for .NET ExpertSorting collection of any type by several fields: Sorting collection of any type by several fields with using Reflection and Expression TreesTPS BarCode Scanner: This is going to be a collaboration platform for TPS team. We want to develop a simple low cost bar code generator and scanner system. This project is currentlVerifyDomainOutlookAddIn: ??????????????????????????????。Ynote Packages: Ynote Packages are a collection of tools which a play a crucial role in extending Ynote Classic and understanding it's true potential.??????-??????【??】??????????: ??????????????????,???、???!???????,????????????????,????????????,???! ?????-?????【??】?????????: ????????????、?????、?????、?????、?????、????,???????????,?????,??????！ ?????-?????【??】?????????: ???????????????,?????????????? ??。??????????、????、????、?????????? ???????。 ??????-??????【??】??????????: ????????????????????,?????,???????,???????????,??????! ??????-??????【??】??????????: ??????????????、??????、????、?????、?????!????,????????????????!????。 ?????-?????【??】?????????: ???????????????????,?????????????????????,?????,????,???????. ?????-?????【??】?????????: ???????????????????、????????、????????、????????、???????,????????????。 ??????-??????【??】??????????: ????????????????、?????、?????、????、?????,??????????。????????????????! ??????-??????【??】??????????: ???????????????????????:????、????、??????????????,????????。????????! ????-????【??】????????: ?????????????????????,????????????,?????、??、????,?????,??????！ ?????-?????【??】?????????: ???????????????????,??????????,????????、????,??????????,??????????。 ?????-?????【??】?????????: ???????,??????:?????,?????,??????,??????????,????????。????????! ????: ????????，????????????????????????，?????????，????????????????。????????????????????，??????????????，?????????????。 ????????????，?：　　?????？　　?????？　　???????？　　??????-??????【??】??????????: ??????????????????????,???????????????,????????????????????! ??????-??????【??】??????????: ??????????????????、????,??100%????,??????,????????????,???????????! ????-????【??】????????: ???????????、??????????????????,????????,?????,??????,????,????,????! ?????-?????【??】?????????: ????????????????,??????????、??????,??????????、????、????、???????。 ?????--?????【??】?????????: ?????????????????????,???????????????,???????,?????,?????,????? !!!

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Factorising program not working. Help required.

- by Ender

I am working on a factorisation problem using Fermat's Factorization and for small numbers it is working well. I've been able to calculate the factors (getting the answers from Wolfram Alpha) for small numbers, like the one on the Wikipedia page (5959). Just when I thought I had the problem licked I soon realised that my program was not working when it came to larger numbers. The program follows through the examples from the Wikipedia page, printing out the values a, b, a2 and b2; the results printed for large numbers are not correct. I've followed the pseudocode provided on the Wikipedia page, but am struggling to understand where to go next. Along with the Wikipedia page I have been following this guide. Once again, as my Math knowledge is pretty poor I cannot follow what I need to do next. The code I am using so far is as follows: import java.math.BigInteger; /** * * @author AlexT */ public class Fermat { private BigInteger a, b; private BigInteger b2; private static final BigInteger TWO = BigInteger.valueOf(2); public void fermat(BigInteger N) { // floor(sqrt(N)) BigInteger tmp = getIntSqrt(N); // a <- ceil(sqrt(N)) a = tmp.add(BigInteger.ONE); // b2 <- a*a-N b2 = (a.multiply(a)).subtract(N); final int bitLength = N.bitLength(); BigInteger root = BigInteger.ONE.shiftLeft(bitLength / 2); root = root.add(b2.divide(root)).divide(TWO); // while b2 not square root while(!(isSqrt(b2, root))) { // a <- a + 1 a = a.add(BigInteger.ONE); // b2 <- (a * a) - N b2 = (a.multiply(a)).subtract(N); root = root.add(b2.divide(root)).divide(TWO); } b = getIntSqrt(b2); BigInteger a2 = a.pow(2); // Wrong BigInteger sum = (a.subtract(b)).multiply((a.add(b))); //if(sum.compareTo(N) == 0) { System.out.println("A: " + a + "\nB: " + b); System.out.println("A^2: " + a2 + "\nB^2: " + b2); //} } /** * Is the number provided a perfect Square Root? * @param n * @param root * @return */ private static boolean isSqrt(BigInteger n, BigInteger root) { final BigInteger lowerBound = root.pow(2); final BigInteger upperBound = root.add(BigInteger.ONE).pow(2); return lowerBound.compareTo(n) <= 0 && n.compareTo(upperBound) < 0; } public BigInteger getIntSqrt(BigInteger x) { // It returns s where s^2 < x < (s+1)^2 BigInteger s; // final result BigInteger currentRes = BigInteger.valueOf(0); // init value is 0 BigInteger currentSum = BigInteger.valueOf(0); // init value is 0 BigInteger sum = BigInteger.valueOf(0); String xS = x.toString(); // change input x to a string xS int lengthOfxS = xS.length(); int currentTwoBits; int i=0; // index if(lengthOfxS % 2 != 0) {// if odd length, add a dummy bit xS = "0".concat(xS); // add 0 to the front of string xS lengthOfxS++; } while(i < lengthOfxS){ // go through xS two by two, left to right currentTwoBits = Integer.valueOf(xS.substring(i,i+2)); i += 2; // sum = currentSum*100 + currentTwoBits sum = currentSum.multiply(BigInteger.valueOf(100)); sum = sum.add(BigInteger.valueOf(currentTwoBits)); // subtraction loop do { currentSum = sum; // remember the value before subtract // in next 3 lines, we work out // currentRes = sum - 2*currentRes - 1 sum = sum.subtract(currentRes); // currentRes++ currentRes = currentRes.add(BigInteger.valueOf(1)); sum = sum.subtract(currentRes); } while(sum.compareTo(BigInteger.valueOf(0)) >= 0); // the loop stops when sum < 0 // go one step back currentRes = currentRes.subtract(BigInteger.valueOf(1)); currentRes = currentRes.multiply(BigInteger.valueOf(10)); } s = currentRes.divide(BigInteger.valueOf(10)); // go one step back return s; } /** * @param args the command line arguments */ public static void main(String[] args) { Fermat fermat = new Fermat(); //Works //fermat.fermat(new BigInteger("5959")); // Doesn't Work fermat.fermat(new BigInteger("90283")); } } If anyone can help me out with this problem I'll be eternally grateful.

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Mass Ball-to-Ball Collision Handling (as in, lots of balls)

- by BlueThen

Update: Found out that I was using the radius as the diameter, which was why the mtd was overcompensating. Hi, StackOverflow. I've written a Processing program awhile back simulating ball physics. Basically, I have a large number of balls (1000), with gravity turned on. Detection works great, but my issue is that they start acting weird when they're bouncing against other balls in all directions. I'm pretty confident this involves the handling. For the most part, I'm using Jay Conrod's code. One part that's different is if (distance > 1.0) return; which I've changed to if (distance < 1.0) return; because the collision wasn't even being performed with the first bit of code, I'm guessing that's a typo. The balls overlap when I use his code, which isn't what I was looking for. My attempt to fix it was to move the balls to the edge of each other: float angle = atan2(y - collider.y, x - collider.x); float distance = dist(x,y, balls[ID2].x,balls[ID2].y); x = collider.x + radius * cos(angle); y = collider.y + radius * sin(angle); This isn't correct, I'm pretty sure of that. I tried the correction algorithm in the previous ball-to-ball topic: // get the mtd Vector2d delta = (position.subtract(ball.position)); float d = delta.getLength(); // minimum translation distance to push balls apart after intersecting Vector2d mtd = delta.multiply(((getRadius() + ball.getRadius())-d)/d); // resolve intersection -- // inverse mass quantities float im1 = 1 / getMass(); float im2 = 1 / ball.getMass(); // push-pull them apart based off their mass position = position.add(mtd.multiply(im1 / (im1 + im2))); ball.position = ball.position.subtract(mtd.multiply(im2 / (im1 + im2))); except my version doesn't use vectors, and every ball's weight is 1. The resulting code I get is this: PVector delta = new PVector(collider.x - x, collider.y - y); float d = delta.mag(); PVector mtd = new PVector(delta.x * ((radius + collider.radius - d) / d), delta.y * ((radius + collider.radius - d) / d)); // push-pull apart based on mass x -= mtd.x * 0.5; y -= mtd.y * 0.5; collider.x += mtd.x * 0.5; collider.y += mtd.y * 0.5; This code seems to over-correct collisions. Which doesn't make sense to me because in no other way do I modify the x and y values of each ball, other than this. Some other part of my code could be wrong, but I don't know. Here's the snippet of the entire ball-to-ball collision handling I'm using: if (alreadyCollided.contains(new Integer(ID2))) // if the ball has already collided with this, then we don't need to reperform the collision algorithm return; Ball collider = (Ball) objects.get(ID2); PVector collision = new PVector(x - collider.x, y - collider.y); float distance = collision.mag(); if (distance == 0) { collision = new PVector(1,0); distance = 1; } if (distance < 1) return; PVector velocity = new PVector(vx,vy); PVector velocity2 = new PVector(collider.vx, collider.vy); collision.div(distance); // normalize the distance float aci = velocity.dot(collision); float bci = velocity2.dot(collision); float acf = bci; float bcf = aci; vx += (acf - aci) * collision.x; vy += (acf - aci) * collision.y; collider.vx += (bcf - bci) * collision.x; collider.vy += (bcf - bci) * collision.y; alreadyCollided.add(new Integer(ID2)); collider.alreadyCollided.add(new Integer(ID)); PVector delta = new PVector(collider.x - x, collider.y - y); float d = delta.mag(); PVector mtd = new PVector(delta.x * ((radius + collider.radius - d) / d), delta.y * ((radius + collider.radius - d) / d)); // push-pull apart based on mass x -= mtd.x * 0.2; y -= mtd.y * 0.2; collider.x += mtd.x * 0.2; collider.y += mtd.y * 0.2; Thanks. (Apologies for lack of sources, stackoverflow thinks I'm a spammer)

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Python - Converting CSV to Objects - Code Design

- by victorhooi

Hi, I have a small script we're using to read in a CSV file containing employees, and perform some basic manipulations on that data. We read in the data (import_gd_dump), and create an Employees object, containing a list of Employee objects (maybe I should think of a better naming convention...lol). We then call clean_all_phone_numbers() on Employees, which calls clean_phone_number() on each Employee, as well as lookup_all_supervisors(), on Employees. import csv import re import sys #class CSVLoader: # """Virtual class to assist with loading in CSV files.""" # def import_gd_dump(self, input_file='Gp Directory 20100331 original.csv'): # gd_extract = csv.DictReader(open(input_file), dialect='excel') # employees = [] # for row in gd_extract: # curr_employee = Employee(row) # employees.append(curr_employee) # return employees # #self.employees = {row['dbdirid']:row for row in gd_extract} # Previously, this was inside a (virtual) class called "CSVLoader". # However, according to here (http://tomayko.com/writings/the-static-method-thing) - the idiomatic way of doing this in Python is not with a class-fucntion but with a module-level function def import_gd_dump(input_file='Gp Directory 20100331 original.csv'): """Return a list ('employee') of dict objects, taken from a Group Directory CSV file.""" gd_extract = csv.DictReader(open(input_file), dialect='excel') employees = [] for row in gd_extract: employees.append(row) return employees def write_gd_formatted(employees_dict, output_file="gd_formatted.csv"): """Read in an Employees() object, and write out each Employee() inside this to a CSV file""" gd_output_fieldnames = ('hrid', 'mail', 'givenName', 'sn', 'dbcostcenter', 'dbdirid', 'hrreportsto', 'PHFull', 'PHFull_message', 'SupervisorEmail', 'SupervisorFirstName', 'SupervisorSurname') try: gd_formatted = csv.DictWriter(open(output_file, 'w', newline=''), fieldnames=gd_output_fieldnames, extrasaction='ignore', dialect='excel') except IOError: print('Unable to open file, IO error (Is it locked?)') sys.exit(1) headers = {n:n for n in gd_output_fieldnames} gd_formatted.writerow(headers) for employee in employees_dict.employee_list: # We're using the employee object's inbuilt __dict__ attribute - hmm, is this good practice? gd_formatted.writerow(employee.__dict__) class Employee: """An Employee in the system, with employee attributes (name, email, cost-centre etc.)""" def __init__(self, employee_attributes): """We use the Employee constructor to convert a dictionary into instance attributes.""" for k, v in employee_attributes.items(): setattr(self, k, v) def clean_phone_number(self): """Perform some rudimentary checks and corrections, to make sure numbers are in the right format. Numbers should be in the form 0XYYYYYYYY, where X is the area code, and Y is the local number.""" if self.telephoneNumber is None or self.telephoneNumber == '': return '', 'Missing phone number.' else: standard_format = re.compile(r'^\+(?P<intl_prefix>\d{2})$(?P<area_code>\d)$(?P<local_first_half>\d{4})-(?P<local_second_half>\d{4})') extra_zero = re.compile(r'^\+(?P<intl_prefix>\d{2})$0(?P<area_code>\d)$(?P<local_first_half>\d{4})-(?P<local_second_half>\d{4})') missing_hyphen = re.compile(r'^\+(?P<intl_prefix>\d{2})$0(?P<area_code>\d)$(?P<local_first_half>\d{4})(?P<local_second_half>\d{4})') if standard_format.search(self.telephoneNumber): result = standard_format.search(self.telephoneNumber) return '0' + result.group('area_code') + result.group('local_first_half') + result.group('local_second_half'), '' elif extra_zero.search(self.telephoneNumber): result = extra_zero.search(self.telephoneNumber) return '0' + result.group('area_code') + result.group('local_first_half') + result.group('local_second_half'), 'Extra zero in area code - ask user to remediate. ' elif missing_hyphen.search(self.telephoneNumber): result = missing_hyphen.search(self.telephoneNumber) return '0' + result.group('area_code') + result.group('local_first_half') + result.group('local_second_half'), 'Missing hyphen in local component - ask user to remediate. ' else: return '', "Number didn't match recognised format. Original text is: " + self.telephoneNumber class Employees: def __init__(self, import_list): self.employee_list = [] for employee in import_list: self.employee_list.append(Employee(employee)) def clean_all_phone_numbers(self): for employee in self.employee_list: #Should we just set this directly in Employee.clean_phone_number() instead? employee.PHFull, employee.PHFull_message = employee.clean_phone_number() # Hmm, the search is O(n^2) - there's probably a better way of doing this search? def lookup_all_supervisors(self): for employee in self.employee_list: if employee.hrreportsto is not None and employee.hrreportsto != '': for supervisor in self.employee_list: if supervisor.hrid == employee.hrreportsto: (employee.SupervisorEmail, employee.SupervisorFirstName, employee.SupervisorSurname) = supervisor.mail, supervisor.givenName, supervisor.sn break else: (employee.SupervisorEmail, employee.SupervisorFirstName, employee.SupervisorSurname) = ('Supervisor not found.', 'Supervisor not found.', 'Supervisor not found.') else: (employee.SupervisorEmail, employee.SupervisorFirstName, employee.SupervisorSurname) = ('Supervisor not set.', 'Supervisor not set.', 'Supervisor not set.') #Is thre a more pythonic way of doing this? def print_employees(self): for employee in self.employee_list: print(employee.__dict__) if __name__ == '__main__': db_employees = Employees(import_gd_dump()) db_employees.clean_all_phone_numbers() db_employees.lookup_all_supervisors() #db_employees.print_employees() write_gd_formatted(db_employees) Firstly, my preamble question is, can you see anything inherently wrong with the above, from either a class design or Python point-of-view? Is the logic/design sound? Anyhow, to the specifics: The Employees object has a method, clean_all_phone_numbers(), which calls clean_phone_number() on each Employee object inside it. Is this bad design? If so, why? Also, is the way I'm calling lookup_all_supervisors() bad? Originally, I wrapped the clean_phone_number() and lookup_supervisor() method in a single function, with a single for-loop inside it. clean_phone_number is O(n), I believe, lookup_supervisor is O(n^2) - is it ok splitting it into two loops like this? In clean_all_phone_numbers(), I'm looping on the Employee objects, and settings their values using return/assignment - should I be setting this inside clean_phone_number() itself? There's also a few things that I'm sorted of hacked out, not sure if they're bad practice - e.g. print_employee() and gd_formatted() both use __dict__, and the constructor for Employee uses setattr() to convert a dictionary into instance attributes. I'd value any thoughts at all. If you think the questions are too broad, let me know and I can repost as several split up (I just didn't want to pollute the boards with multiple similar questions, and the three questions are more or less fairly tightly related). Cheers, Victor

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Trying to draw 2 objects on screen and store the selected item names in an array

- by thefonso

Ok...this is a homework question, here is what i'm asked to do.... "Allow the user to draw two Shapes, which when instantiated, get put into the array myShapes...(store the shapes in the createShape() method." I want to know if I'm going in the right direction. Do I need to modify only Model.java or GUIDemo.java as well? Am I sufficient in thinking of only storing the values for the array via a loop inside my createShape() method? How do I go a bout checking to see if things work so far. There are many steps for this homework project after this one but i'm stuck here. Please point me in the right direction. The array myShapes lives inside my model class inside Model.java: package model; import java.awt.Color; import java.awt.Container; import shapes.Line; import shapes.Oval; import shapes.Rectangle; import shapes.Shape; import shapes.Triangle; import interfaces.Resettable; public class Model implements Resettable { private Container container; private String message; public final static String DRAW = "Draw"; public final static String MOVE = "Move"; public final static String REMOVE = "Remove"; public final static String RESIZE = "Resize"; public final static String FILL = "Fill"; public final static String CHANGE = "Change"; public final static String RECTANGLE = "Rectangle"; public final static String OVAL = "Oval"; public final static String LINE = "Line"; public final static String TRIANGLE = "Triangle"; private String action = DRAW; private boolean fill = false; public static String[] selections = {"Rectangle", "Oval", "Line", "Triangle"}; //project 9 begin public Shape[] myShapes = new Shape[2]; //project 9 stop private String currentShapeType; private Shape currentShape; public Color lineColor; private Color fillColor = Color.gray; public Shape createShape() { if(currentShapeType == RECTANGLE){ currentShape = new Rectangle(0, 0, 0, 0, lineColor, fillColor, fill); } if(currentShapeType == OVAL) { currentShape = new Oval(0,0,0,0, lineColor, fillColor, fill); } if(currentShapeType == LINE) { currentShape = new Line(0,0,0,0, lineColor, fillColor, fill); } if(currentShapeType == TRIANGLE) { currentShape = new Triangle(0,0,0,0, lineColor, fillColor, fill); } //project 9 start if(myShapes[0] == null) { myShapes[0]=currentShape; } else { myShapes[1]=currentShape; } //project 9 stop return currentShape; } public Shape getCurrentShape() { return currentShape; } public String getCurrentShapeType(){ return currentShapeType; } public void setCurrentShapeType(String shapeType){ currentShapeType = shapeType; } public Model(Container container) { this.container = container; } public void repaint() { container.repaint(); } public void resetComponents() { action = DRAW; currentShape = null; if (container instanceof Resettable) { ((Resettable) container).resetComponents(); } } public String getAction() { return action; } public void setAction(String action) { this.action = action; } public boolean isFill() { return fill; } public void setFill(boolean fill) { this.fill = fill; } public void setMessage(String msg) { this.message = msg; } public String getMessage() { return this.message; } public Color getLineColor() { return this.lineColor; } public void setLineColor(Color c) { this.lineColor = c; } public String toString() { return "Model:\n\tAction: " + action + "\n\tFill: " + fill; } } The application is run from GUIDemo.java: package ui.applet; import interfaces.Resettable; import java.applet.Applet; import java.awt.Graphics; import event.ShapeMouseHandler; import shapes.Shape; //import ui.panels.ButtonPanel; import ui.panels.ChoicePanel; import ui.panels.MainPanel; import model.Model; @SuppressWarnings("serial") public class GUIDemo extends Applet implements Resettable { MainPanel mainPanel; Model model; ChoicePanel choicePanel; public void init() { resize(600,400); model = new Model(this); choicePanel = new ChoicePanel(model); mainPanel = new MainPanel(model); this.add(choicePanel);//this is the drop down list this.add(mainPanel);//these are the radio buttons and reset button ShapeMouseHandler mouseHandler = new ShapeMouseHandler(model); addMouseListener(mouseHandler); addMouseMotionListener(mouseHandler); } public void paint(Graphics g) { Shape shape; shape = model.getCurrentShape(); if(shape != null) { shape.draw(g); } System.out.println(model); System.out.println(shape); } public void resetComponents() { mainPanel.resetComponents(); choicePanel.resetComponents(); } }

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Html shows after submitting form and is nowhere to be found in php script.

- by Kelbizzle

Upon submitting this form on my site. It send me to a page that says. "Use Back - fill in all fields Use back! ! " But this html isn't in the mail script anywhere. Where could this be coming from? I started out using this contact form (http://www.ibdhost.com/contact/) then changed it a little. Here is the mail script. <?php session_start(); ?> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Sendemail Script</title> </head> <body>   <?php //the 3 variables below were changed to use the SERVER variable $ip = $_SERVER['REMOTE_ADDR']; $httpref = $_SERVER['HTTP_REFERER']; $httpagent = $_SERVER['HTTP_USER_AGENT']; $visitorf = $_POST['visitorf']; $visitorl = $_POST['visitorl']; $visitormail = $_POST['visitormail']; $visitorphone = $_POST['visitorphone']; //$notes = $_POST['notes']; //$attn = $_POST['attn']; $lookup = array( 'The Election Report' => 'http://www.mydowmain.net/', '5 Resons' => 'http://www.mydomain.net/', 'Report 3' => 'http://someotherurl3.com/', 'Report 4' => 'http://someotherurl4.com/', 'Report 5' => 'http://someotherurl5.com/', // et cetera for your other values ); $attn = trim($_POST['attn']); $url = $lookup[$attn]; //echo 'attn: ' . $attn . ', url:' . $url; die; //additional headers $headers = 'From: US <[email protected]>' . "\r\n"; //$headers .= 'BCC: [email protected]' . "\r\n"; $todayis = date("l, F j, Y, g:i a") ; $subject = "your lead has downloaded a report."; $subjectdp = "Someone has downloaded a report!"; $notes = stripcslashes($notes); $message = "Dear PAl Affiliate,\n\nA prospective lead of yours has downloaded a report from our Website.\nAny contact information they have left and a link to the report they downloaded\ncan be found below. This is the perfect opportunity for you to open up a line of\ncommunication with the prospect and find out their intrests! If you have any questions\nabout this email please feel free to email us at [email protected]\n\n\nFrom: $visitorf $visitorl ($visitormail)\nTelephone Number: $visitorphone \nReport Downloaded:$url\n \n\nBest regards,\nThe Crew"; //$message = "$todayis [EST] \nAttention: \nMessage: $notes \nFrom: $visitorf $visitorl ($visitormail) \nTelephone Number: //$visitorphone \nReport Downloaded:$url\nAdditional Info : IP = $ip \nBrowser Info: $httpagent \nReferral : $httpref\n"; $messagedp = "A Visitor has just downloaded a report. You can find their contact information below.\n \n ***********************************************************************\n From: $visitorf $visitorl\n Email: $visitormail\n Telephone Number: $visitorphone \n Report Downloaded:$url\n \n \n Best regards,\n The Crew\n"; $messagelead = "Dear, $visitorf\n \n \n We appreciate your interest. Below you will find the URL to download the report you requested.\n Things are always changing in costa rica , so check back often. Also, check us out on Facebook & Twitter \n for daily updates. If there is anything we can do at anytime to enhance your experience, please do\n not hesitate to contact us.\n \n To download your report simply click on the link below. (You must have Adobe Reader or an alternative PDF reader installed)\n \n *** Download Link ***\n $url\n"; //check if the function even exists if(function_exists("mail")) { //send the email mail($_SESSION['email'], $subject, $message, $headers) or die("could not send email"); } else { die("mail fucntion not enabled"); } //send the email to us mail('[email protected]', $subjectdp, $messagedp); //send the email to the lead mail($visitormail, 'Thanks for downloading the report!', $messagelead, $headers); header( "Location: http://www.mydomain.com/thanks_report.php" ); ?> </body> </html>

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ASP.net MVC 2.0 using the same form for adding and editing.

- by Chevex

I would like to use the same view for editing a blog post and adding a blog post. However, I'm having an issue with the ID. When adding a blog post, I have no need for an ID value to be posted. When model binding binds the form values to the BlogPost object in the controller, it will auto-generate the ID in entity framework entity. When I am editing a blog post I DO need a hidden form field to store the ID in so that it accompanies the next form post. Here is the view I have right now. <% using (Html.BeginForm("CommitEditBlogPost", "Admin")) { %> <% if (Model != null) { %> <%: Html.HiddenFor(x => x.Id)%> <% } %> Title:<br /> <%: Html.TextBoxFor(x => x.Title, new { Style = "Width: 90%;" })%> <br /> <br /> Summary:<br /> <%: Html.TextAreaFor(x => x.Summary, new { Style = "Width: 90%; Height: 50px;" }) %> <br /> <br /> Body:<br /> <%: Html.TextAreaFor(x => x.Body, new { Style = "Height: 250px; Width: 90%;" })%> <br /> <br /> <input type="submit" value="Submit" /> <% } %> Right now checking if the model is coming in NULL is a great way to know if I'm editing a blog post or adding one, because when I'm adding one it will be null as it hasn't been created yet. The problem comes in when there is an error and the entity is invalid. When the controller renders the form after an invalid model the Model != null evaluates to false, even though we are editing a post and there is clearly a model. If I render the hidden input field for ID when adding a post, I get an error stating that the ID can't be null. Any help is appreciated. EDIT: I went with OJ's answer for this question, however I discovered something that made me feel silly and I wanted to share it just in case anyone was having a similar issue. The page the adds/edits blogs does not even need a hidden field for id, ever. The reason is because when I go to add a blog I do a GET to this relative URL BlogProject/Admin/AddBlogPost This URL does not contain an ID and the action method just renders the page. The page does a POST to the same URL when adding the blog post. The incoming BlogPost entity has a null Id and is generated by EF during save changes. The same thing happens when I edit blog posts. The URL is BlogProject/Admin/EditBlogPost/{Id} This URL contains the id of the blog post and since the page is posting back to the exact same URL the id goes with the POST to the action method that executes the edit. The only problem I encountered with this is that the action methods cannot have identical signatures. [HttpGet] public ViewResult EditBlogPost(int Id) { } [HttpPost] public ViewResult EditBlogPost(int Id) { } The compiler will yell at you if you try to use these two methods above. It is far too convenient that the Id will be posted back when doing a Html.BeginForm() with no arguments for action or controller. So rather than change the name of the POST method I just modified the arguments to include a FormCollection. Like this: [HttpPost] public ViewResult EditBlogPost(int Id, FormCollection formCollection) { // You can then use formCollection as the IValueProvider for UpdateModel() // and TryUpdateModel() if you wish. I mean, you might as well use the // argument since you're taking it. } The formCollection variable is filled via model binding with the same content that Request.Form would be by default. You don't have to use this collection for UpdateModel() or TryUpdateModel() but I did just so I didn't feel like that collection was pointless since it really was just to make the method signature different from its GET counterpart. Thanks for the help guys!

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How to match ColdFusion encryption with Java 1.4.2?

- by JohnTheBarber

* sweet - thanks to Edward Smith for the CF Technote that indicated the key from ColdFusion was Base64 encoded. See generateKey() for the 'fix' My task is to use Java 1.4.2 to match the results a given ColdFusion code sample for encryption. Known/given values: A 24-byte key A 16-byte salt (IVorSalt) Encoding is Hex Encryption algorithm is AES/CBC/PKCS5Padding A sample clear-text value The encrypted value of the sample clear-text after going through the ColdFusion code Assumptions: Number of iterations not specified in the ColdFusion code so I assume only one iteration 24-byte key so I assume 192-bit encryption Given/working ColdFusion encryption code sample: <cfset ThisSalt = "16byte-salt-here"> <cfset ThisAlgorithm = "AES/CBC/PKCS5Padding"> <cfset ThisKey = "a-24byte-key-string-here"> <cfset thisAdjustedNow = now()> <cfset ThisDateTimeVar = DateFormat( thisAdjustedNow , "yyyymmdd" )> <cfset ThisDateTimeVar = ThisDateTimeVar & TimeFormat( thisAdjustedNow , "HHmmss" )> <cfset ThisTAID = ThisDateTimeVar & "|" & someOtherData> <cfset ThisTAIDEnc = Encrypt( ThisTAID , ThisKey , ThisAlgorithm , "Hex" , ThisSalt)> My Java 1.4.2 encryption/decryption code swag: package so.example; import java.security.*; import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import org.apache.commons.codec.binary.*; public class SO_AES192 { private static final String _AES = "AES"; private static final String _AES_CBC_PKCS5Padding = "AES/CBC/PKCS5Padding"; private static final String KEY_VALUE = "a-24byte-key-string-here"; private static final String SALT_VALUE = "16byte-salt-here"; private static final int ITERATIONS = 1; private static IvParameterSpec ivParameterSpec; public static String encryptHex(String value) throws Exception { Key key = generateKey(); Cipher c = Cipher.getInstance(_AES_CBC_PKCS5Padding); ivParameterSpec = new IvParameterSpec(SALT_VALUE.getBytes()); c.init(Cipher.ENCRYPT_MODE, key, ivParameterSpec); String valueToEncrypt = null; String eValue = value; for (int i = 0; i < ITERATIONS; i++) { // valueToEncrypt = SALT_VALUE + eValue; // pre-pend salt - Length > sample length valueToEncrypt = eValue; // don't pre-pend salt Length = sample length byte[] encValue = c.doFinal(valueToEncrypt.getBytes()); eValue = Hex.encodeHexString(encValue); } return eValue; } public static String decryptHex(String value) throws Exception { Key key = generateKey(); Cipher c = Cipher.getInstance(_AES_CBC_PKCS5Padding); ivParameterSpec = new IvParameterSpec(SALT_VALUE.getBytes()); c.init(Cipher.DECRYPT_MODE, key, ivParameterSpec); String dValue = null; char[] valueToDecrypt = value.toCharArray(); for (int i = 0; i < ITERATIONS; i++) { byte[] decordedValue = Hex.decodeHex(valueToDecrypt); byte[] decValue = c.doFinal(decordedValue); // dValue = new String(decValue).substring(SALT_VALUE.length()); // when salt is pre-pended dValue = new String(decValue); // when salt is not pre-pended valueToDecrypt = dValue.toCharArray(); } return dValue; } private static Key generateKey() throws Exception { // Key key = new SecretKeySpec(KEY_VALUE.getBytes(), _AES); // this was wrong Key key = new SecretKeySpec(new BASE64Decoder().decodeBuffer(keyValueString), _AES); // had to un-Base64 the 'known' 24-byte key. return key; } } I cannot create a matching encrypted value nor decrypt a given encrypted value. My guess is it's something to do with how I'm handling the initial vector/salt. I'm not very crypto-savvy but I'm thinking I should be able to take the sample clear-text and produce the same encrypted value in Java as ColdFusion produced. I am able to encrypt/decrypt my own data with my Java code (so I'm consistent) but I cannot match nor decrypt the ColdFusion sample encrypted value. I have access to a local webservice that can test the encrypted output. The given ColdFusion output sample passes/decrypts fine (of course). If I try to decrypt the same sample with my Java code (using the actual key and salt) I get a "Given final block not properly padded" error. I get the same net result when I pass my attempt at encryption (using the actual key and salt) to the test webservice. Any Ideas?

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How to maintain encapsulation with composition in C++?

- by iFreilicht

I am designing a class Master that is composed from multiple other classes, A, Base, C and D. These four classes have absolutely no use outside of Master and are meant to split up its functionality into manageable and logically divided packages. They also provide extensible functionality as in the case of Base, which can be inherited from by clients. But, how do I maintain encapsulation of Master with this design? So far, I've got two approaches, which are both far from perfect: 1. Replicate all accessors: Just write accessor-methods for all accessor-methods of all classes that Master is composed of. This leads to perfect encapsulation, because no implementation detail of Master is visible, but is extremely tedious and makes the class definition monstrous, which is exactly what the composition should prevent. Also, adding functionality to one of the composees (is that even a word?) would require to re-write all those methods in Master. An additional problem is that inheritors of Base could only alter, but not add functionality. 2. Use non-assignable, non-copyable member-accessors: Having a class accessor<T> that can not be copied, moved or assigned to, but overrides the operator-> to access an underlying shared_ptr, so that calls like Master->A()->niceFunction(); are made possible. My problem with this is that it kind of breaks encapsulation as I would now be unable to change my implementation of Master to use a different class for the functionality of niceFunction(). Still, it is the closest I've gotten without using the ugly first approach. It also fixes the inheritance issue quite nicely. A small side question would be if such a class already existed in std or boost. EDIT: Wall of code I will now post the code of the header files of the classes discussed. It may be a bit hard to understand, but I'll give my best in explaining all of it. 1. GameTree.h The foundation of it all. This basically is a doubly-linked tree, holding GameObject-instances, which we'll later get to. It also has it's own custom iterator GTIterator, but I left that out for brevity. WResult is an enum with the values SUCCESS and FAILED, but it's not really important. class GameTree { public: //Static methods for the root. Only one root is allowed to exist at a time! static void ConstructRoot(seed_type seed, unsigned int depth); inline static bool rootExists(){ return static_cast<bool>(rootObject_); } inline static weak_ptr<GameTree> root(){ return rootObject_; } //delta is in ms, this is used for velocity, collision and such void tick(unsigned int delta); //Interaction with the tree inline weak_ptr<GameTree> parent() const { return parent_; } inline unsigned int numChildren() const{ return static_cast<unsigned int>(children_.size()); } weak_ptr<GameTree> getChild(unsigned int index) const; template<typename GOType> weak_ptr<GameTree> addChild(seed_type seed, unsigned int depth = 9001){ GOType object{ new GOType(seed) }; return addChildObject(unique_ptr<GameTree>(new GameTree(std::move(object), depth))); } WResult moveTo(weak_ptr<GameTree> newParent); WResult erase(); //Iterators for for( : ) loop GTIterator& begin(){ return *(beginIter_ = std::move(make_unique<GTIterator>(children_.begin()))); } GTIterator& end(){ return *(endIter_ = std::move(make_unique<GTIterator>(children_.end()))); } //unloading should be used when objects are far away WResult unloadChildren(unsigned int newDepth = 0); WResult loadChildren(unsigned int newDepth = 1); inline const RenderObject& renderObject() const{ return gameObject_->renderObject(); } //Getter for the underlying GameObject (I have not tested the template version) weak_ptr<GameObject> gameObject(){ return gameObject_; } template<typename GOType> weak_ptr<GOType> gameObject(){ return dynamic_cast<weak_ptr<GOType>>(gameObject_); } weak_ptr<PhysicsObject> physicsObject() { return gameObject_->physicsObject(); } private: GameTree(const GameTree&); //copying is only allowed internally GameTree(shared_ptr<GameObject> object, unsigned int depth = 9001); //pointer to root static shared_ptr<GameTree> rootObject_; //internal management of a child weak_ptr<GameTree> addChildObject(shared_ptr<GameTree>); WResult removeChild(unsigned int index); //private members shared_ptr<GameObject> gameObject_; shared_ptr<GTIterator> beginIter_; shared_ptr<GTIterator> endIter_; //tree stuff vector<shared_ptr<GameTree>> children_; weak_ptr<GameTree> parent_; unsigned int selfIndex_; //used for deletion, this isn't necessary void initChildren(unsigned int depth); //constructs children }; 2. GameObject.h This is a bit hard to grasp, but GameObject basically works like this: When constructing a GameObject, you construct its basic attributes and a CResult-instance, which contains a vector<unique_ptr<Construction>>. The Construction-struct contains all information that is needed to construct a GameObject, which is a seed and a function-object that is applied at construction by a factory. This enables dynamic loading and unloading of GameObjects as done by GameTree. It also means that you have to define that factory if you inherit GameObject. This inheritance is also the reason why GameTree has a template-function gameObject<GOType>. GameObject can contain a RenderObject and a PhysicsObject, which we'll later get to. Anyway, here's the code. class GameObject; typedef unsigned long seed_type; //this declaration magic means that all GameObjectFactorys inherit from GameObjectFactory<GameObject> template<typename GOType> struct GameObjectFactory; template<> struct GameObjectFactory<GameObject>{ virtual unique_ptr<GameObject> construct(seed_type seed) const = 0; }; template<typename GOType> struct GameObjectFactory : GameObjectFactory<GameObject>{ GameObjectFactory() : GameObjectFactory<GameObject>(){} unique_ptr<GameObject> construct(seed_type seed) const{ return unique_ptr<GOType>(new GOType(seed)); } }; //same as with the factories. this is important for storing them in vectors template<typename GOType> struct Construction; template<> struct Construction<GameObject>{ virtual unique_ptr<GameObject> construct() const = 0; }; template<typename GOType> struct Construction : Construction<GameObject>{ Construction(seed_type seed, function<void(GOType*)> func = [](GOType* null){}) : Construction<GameObject>(), seed_(seed), func_(func) {} unique_ptr<GameObject> construct() const{ unique_ptr<GameObject> gameObject{ GOType::factory.construct(seed_) }; func_(dynamic_cast<GOType*>(gameObject.get())); return std::move(gameObject); } seed_type seed_; function<void(GOType*)> func_; }; typedef struct CResult { CResult() : constructions{} {} CResult(CResult && o) : constructions(std::move(o.constructions)) {} CResult& operator= (CResult& other){ if (this != &other){ for (unique_ptr<Construction<GameObject>>& child : other.constructions){ constructions.push_back(std::move(child)); } } return *this; } template<typename GOType> void push_back(seed_type seed, function<void(GOType*)> func = [](GOType* null){}){ constructions.push_back(make_unique<Construction<GOType>>(seed, func)); } vector<unique_ptr<Construction<GameObject>>> constructions; } CResult; //finally, the GameObject class GameObject { public: GameObject(seed_type seed); GameObject(const GameObject&); virtual void tick(unsigned int delta); inline Matrix4f trafoMatrix(){ return physicsObject_->transformationMatrix(); } //getter inline seed_type seed() const{ return seed_; } inline CResult& properties(){ return properties_; } inline const RenderObject& renderObject() const{ return *renderObject_; } inline weak_ptr<PhysicsObject> physicsObject() { return physicsObject_; } protected: virtual CResult construct_(seed_type seed) = 0; CResult properties_; shared_ptr<RenderObject> renderObject_; shared_ptr<PhysicsObject> physicsObject_; seed_type seed_; }; 3. PhysicsObject That's a bit easier. It is responsible for position, velocity and acceleration. It will also handle collisions in the future. It contains three Transformation objects, two of which are optional. I'm not going to include the accessors on the PhysicsObject class because I tried my first approach on it and it's just pure madness (way over 30 functions). Also missing: the named constructors that construct PhysicsObjects with different behaviour. class Transformation{ Vector3f translation_; Vector3f rotation_; Vector3f scaling_; public: Transformation() : translation_{ 0, 0, 0 }, rotation_{ 0, 0, 0 }, scaling_{ 1, 1, 1 } {}; Transformation(Vector3f translation, Vector3f rotation, Vector3f scaling); inline Vector3f translation(){ return translation_; } inline void translation(float x, float y, float z){ translation(Vector3f(x, y, z)); } inline void translation(Vector3f newTranslation){ translation_ = newTranslation; } inline void translate(float x, float y, float z){ translate(Vector3f(x, y, z)); } inline void translate(Vector3f summand){ translation_ += summand; } inline Vector3f rotation(){ return rotation_; } inline void rotation(float pitch, float yaw, float roll){ rotation(Vector3f(pitch, yaw, roll)); } inline void rotation(Vector3f newRotation){ rotation_ = newRotation; } inline void rotate(float pitch, float yaw, float roll){ rotate(Vector3f(pitch, yaw, roll)); } inline void rotate(Vector3f summand){ rotation_ += summand; } inline Vector3f scaling(){ return scaling_; } inline void scaling(float x, float y, float z){ scaling(Vector3f(x, y, z)); } inline void scaling(Vector3f newScaling){ scaling_ = newScaling; } inline void scale(float x, float y, float z){ scale(Vector3f(x, y, z)); } void scale(Vector3f factor){ scaling_(0) *= factor(0); scaling_(1) *= factor(1); scaling_(2) *= factor(2); } Matrix4f matrix(){ return WMatrix::Translation(translation_) * WMatrix::Rotation(rotation_) * WMatrix::Scale(scaling_); } }; class PhysicsObject; typedef void tickFunction(PhysicsObject& self, unsigned int delta); class PhysicsObject{ PhysicsObject(const Transformation& trafo) : transformation_(trafo), transformationVelocity_(nullptr), transformationAcceleration_(nullptr), tick_(nullptr) {} PhysicsObject(PhysicsObject&& other) : transformation_(other.transformation_), transformationVelocity_(std::move(other.transformationVelocity_)), transformationAcceleration_(std::move(other.transformationAcceleration_)), tick_(other.tick_) {} Transformation transformation_; unique_ptr<Transformation> transformationVelocity_; unique_ptr<Transformation> transformationAcceleration_; tickFunction* tick_; public: void tick(unsigned int delta){ tick_ ? tick_(*this, delta) : 0; } inline Matrix4f transformationMatrix(){ return transformation_.matrix(); } } 4. RenderObject RenderObject is a base class for different types of things that could be rendered, i.e. Meshes, Light Sources or Sprites. DISCLAIMER: I did not write this code, I'm working on this project with someone else. class RenderObject { public: RenderObject(float renderDistance); virtual ~RenderObject(); float renderDistance() const { return renderDistance_; } void setRenderDistance(float rD) { renderDistance_ = rD; } protected: float renderDistance_; }; struct NullRenderObject : public RenderObject{ NullRenderObject() : RenderObject(0.f){}; }; class Light : public RenderObject{ public: Light() : RenderObject(30.f){}; }; class Mesh : public RenderObject{ public: Mesh(unsigned int seed) : RenderObject(20.f) { meshID_ = 0; textureID_ = 0; if (seed == 1) meshID_ = Model::getMeshID("EM-208_heavy"); else meshID_ = Model::getMeshID("cube"); }; unsigned int getMeshID() const { return meshID_; } unsigned int getTextureID() const { return textureID_; } private: unsigned int meshID_; unsigned int textureID_; }; I guess this shows my issue quite nicely: You see a few accessors in GameObject which return weak_ptrs to access members of members, but that is not really what I want. Also please keep in mind that this is NOT, by any means, finished or production code! It is merely a prototype and there may be inconsistencies, unnecessary public parts of classes and such.

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Why can't my main class see the array in my calender class

- by Rocky Celltick Eadie

This is a homework problem. I'm already 5 days late and can't figure out what I'm doing wrong.. this is my 1st semester in Java and my first post on this site Here is the assignment.. Create a class called Calendar. The class should contain a variable called events that is a String array. The array should be created to hold 5 elements. Use a constant value to specify the array size. Do not hard code the array size. Initialize the array in the class constructor so that each element contains the string “ – No event planned – “. The class should contain a method called CreateEvent. This method should accept a String argument that contains a one-word user event and an integer argument that represents the day of the week. Monday should be represented by the number 1 and Friday should be represented by the number 5. Populate the events array with the event info passed into the method. Although the user will input one-word events, each event string should prepend the following string to each event: event_dayAppoinment: (where event_day is the day of the week) For example, if the user enters 1 and “doctor” , the first array element should read: Monday Appointment: doctor If the user enters 2 and “PTA” , the second array element should read: Tuesday Appointment: PTA Write a driver program (in a separate class) that creates and calls your Calendar class. Then use a loop to gather user input. Ask for the day (as an integer) and then ask for the event (as a one word string). Pass the integer and string to the Calendar object’s CreateEvent method. The user should be able enter 0 – 5 events. If the user enters -1, the loop should exit and your application should print out all the events in a tabular format. Your program should not allow the user to enter invalid values for the day of the week. Any input other than 1 – 5 or -1 for the day of the week would be considered invalid. Notes: When obtaining an integer from the user, you will need to use the nextInt() method on your Scanner object. When obtaining a string from a user, you will need to use the next() method on your Scanner object. Here is my code so far.. //DRIVER CLASS /** * * @author Rocky */ //imports scanner import java.util.Scanner; //begin class driver public class driver { /** * @paramargs the command line arguments */ //begin main method public static void main(String[] args) { //initiates scanner Scanner userInput = new Scanner (System.in); //declare variables int dayOfWeek; String userEvent; //creates object for calender class calendercalenderObject = new calender(); //user prompt System.out.println("Enter day of week for your event in the following format:"); System.out.println("Enter 1 for Monday"); System.out.println("Enter 2 for Tuesday"); System.out.println("Enter 3 for Wednsday"); System.out.println("Enter 4 for Thursday"); System.out.println("Enter 5 for Friday"); System.out.println("Enter -1 to quit"); //collect user input dayOfWeek = userInput.nextInt(); //user prompt System.out.println("Please type in the name of your event"); //collect user input userEvent = userInput.next(); //begin while loop while (dayOfWeek != -1) { //test for valid day of week if ((dayOfWeek>=1) && (dayOfWeek<=5)){ //calls createEvent method in calender class and passes 2 variables calenderObject.createEvent(userEvent,dayOfWeek); } else { //error message System.out.println("You have entered an invalid number"); //user prompts System.out.println("Press -1 to quit or enter another day"); System.out.println("Enter 1 for Monday"); System.out.println("Enter 2 for Tuesday"); System.out.println("Enter 3 for Wednsday"); System.out.println("Enter 4 for Thursday"); System.out.println("Enter 5 for Friday"); System.out.println("Enter -1 to quit"); //collect user input dayOfWeek = userInput.nextInt(); //end data validity test } //end while loop } //prints array to screen int i=0; for (i=0;i<events.length;i++){ System.out.println(events[i]); } //end main method } } /** * * @author Rocky */ //imports scanner import java.util.Scanner; //begin calender class public class calender { //creates events array String[] events = new String[5]; //begin calender class constructor public calender() { //Initializes array String[] events = {"-No event planned-","-No event planned-","-No event planned-","-No event planned-","-No event planned-"}; //end calender class constructor } //begin createEvent method public String[] createEvent (String userEvent, int dayOfWeek){ //Start switch test switch (dayOfWeek){ case 1: events[0] = ("Monday Appoinment:") + userEvent; break; case 2: events[1] = ("Tuesday Appoinment:") + userEvent; break; case 3: events[2] = ("WednsdayAppoinment:") + userEvent; break; case 4: events[3] = ("Thursday Appoinment:") + userEvent; break; case 5: events[4] = ("Friday Appoinment:") + userEvent; break; default: break; //End switch test } //returns events array return events; //end create event method } //end calender class }

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Exception - Illegal Block size during decryption(Android)

- by Vamsi

I am writing an application which encrypts and decrypts the user notes based on the user set password. i used the following algorithms for encryption/decryption 1. PBEWithSHA256And256BitAES-CBC-BC 2. PBEWithMD5And128BitAES-CBC-OpenSSL e_Cipher = Cipher.getInstance(PBEWithSHA256And256BitAES-CBC-BC); d_Cipher = Cipher.getInstance(PBEWithSHA256And256BitAES-CBC-BC); e_Cipher.init() d_Cipher.init() encryption is working well, but when trying to decrypt it gives Exception - Illegal Block size after encryption i am converting the cipherText to HEX and storing it in a sqlite database. i am retrieving correct values from the sqlite database during decyption but when calling d_Cipher.dofinal() it throws the Exception. I thought i missed to specify the padding and tried to check what are the other available cipher algorithms but i was unable to found. so request you to please give the some knowledge on what are the cipher algorithms and padding that are supported by Android? if the algorithm which i used can be used for padding, how should i specify the padding mechanism? I am pretty new to Encryption so tried a couple of algorithms which are available in BouncyCastle.java but unsuccessful. As requested here is the code public class CryptoHelper { private static final String TAG = "CryptoHelper"; //private static final String PBEWithSHA256And256BitAES = "PBEWithSHA256And256BitAES-CBC-BC"; //private static final String PBEWithSHA256And256BitAES = "PBEWithMD5And128BitAES-CBC-OpenSSL"; private static final String PBEWithSHA256And256BitAES = "PBEWithMD5And128BitAES-CBC-OpenSSLPBEWITHSHA1AND3-KEYTRIPLEDES-CB"; private static final String randomAlgorithm = "SHA1PRNG"; public static final int SALT_LENGTH = 8; public static final int SALT_GEN_ITER_COUNT = 20; private final static String HEX = "0123456789ABCDEF"; private Cipher e_Cipher; private Cipher d_Cipher; private SecretKey secretKey; private byte salt[]; public CryptoHelper(String password) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException { char[] cPassword = password.toCharArray(); PBEKeySpec pbeKeySpec = new PBEKeySpec(cPassword); PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, SALT_GEN_ITER_COUNT); SecretKeyFactory keyFac = SecretKeyFactory.getInstance(PBEWithSHA256And256BitAES); secretKey = keyFac.generateSecret(pbeKeySpec); SecureRandom saltGen = SecureRandom.getInstance(randomAlgorithm); this.salt = new byte[SALT_LENGTH]; saltGen.nextBytes(this.salt); e_Cipher = Cipher.getInstance(PBEWithSHA256And256BitAES); d_Cipher = Cipher.getInstance(PBEWithSHA256And256BitAES); e_Cipher.init(Cipher.ENCRYPT_MODE, secretKey, pbeParamSpec); d_Cipher.init(Cipher.DECRYPT_MODE, secretKey, pbeParamSpec); } public String encrypt(String cleartext) throws IllegalBlockSizeException, BadPaddingException { byte[] encrypted = e_Cipher.doFinal(cleartext.getBytes()); return convertByteArrayToHex(encrypted); } public String decrypt(String cipherString) throws IllegalBlockSizeException { byte[] plainText = decrypt(convertStringtobyte(cipherString)); return(new String(plainText)); } public byte[] decrypt(byte[] ciphertext) throws IllegalBlockSizeException { byte[] retVal = {(byte)0x00}; try { retVal = d_Cipher.doFinal(ciphertext); } catch (BadPaddingException e) { Log.e(TAG, e.toString()); } return retVal; } public String convertByteArrayToHex(byte[] buf) { if (buf == null) return ""; StringBuffer result = new StringBuffer(2*buf.length); for (int i = 0; i < buf.length; i++) { appendHex(result, buf[i]); } return result.toString(); } private static void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f)); } private static byte[] convertStringtobyte(String hexString) { int len = hexString.length()/2; byte[] result = new byte[len]; for (int i = 0; i < len; i++) { result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue(); } return result; } public byte[] getSalt() { return salt; } public SecretKey getSecretKey() { return secretKey; } public static SecretKey createSecretKey(char[] password) throws NoSuchAlgorithmException, InvalidKeySpecException { PBEKeySpec pbeKeySpec = new PBEKeySpec(password); SecretKeyFactory keyFac = SecretKeyFactory.getInstance(PBEWithSHA256And256BitAES); return keyFac.generateSecret(pbeKeySpec); } } I will call mCryptoHelper.decrypt(String str) then this results in Illegal block size exception My Env: Android 1.6 on Eclipse

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