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  • Variable naming for arrays - C#

    - by David Neale
    What should I call a variable instantiated with some type of array? Is it okay to simply use a pluralised form of the type being held? IList<Person> people = new List<Person>(); or should I append something like 'List' to the name? IList<Person> personList = new List<Person>();

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  • When to address integer overflow in C

    - by Yktula
    Related question: http://stackoverflow.com/questions/199333/best-way-to-detect-integer-overflow-in-c-c In C code, should integer overflow be addressed whenever integers are added? It seems like pointers and array indexes should be checked at all. When should integer overflow be checked for? When numbers are added in C without type explicitly mentioned, or printed with printf, when will overflow occur? Is there a way to automatically detect when an integer arithmetic overflow?

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  • Challenge: Neater way of currying or partially applying C#4's string.Join

    - by Damian Powell
    Background I recently read that .NET 4's System.String class has a new overload of the Join method. This new overload takes a separator, and an IEnumerable<T> which allows arbitrary collections to be joined into a single string without the need to convert to an intermediate string array. Cool! That means I can now do this: var evenNums = Enumerable.Range(1, 100) .Where(i => i%2 == 0); var list = string.Join(",",evenNums); ...instead of this: var evenNums = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .Select(i => i.ToString()) .ToArray(); var list = string.Join(",", evenNums); ...thus saving on a conversion of every item to a string, and then the allocation of an array. The Problem However, being a fan of the functional style of programming in general, and method chaining in C# in particular, I would prefer to be able to write something like this: var list = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .string.Join(","); This is not legal C# though. The closest I've managed to get is this: var list = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .ApplyTo( Functional.Curry<string, IEnumerable<object>, string> (string.Join)(",") ); ...using the following extension methods: public static class Functional { public static TRslt ApplyTo<TArg, TRslt>(this TArg arg, Func<TArg, TRslt> func) { return func(arg); } public static Func<T1, Func<T2, TResult>> Curry<T1, T2, TResult>(this Func<T1, T2, TResult> func) { Func<Func<T1, T2, TResult>, Func<T1, Func<T2, TResult>>> curried = f => x => y => f(x, y); return curried(func); } } This is quite verbose, requires explicit definition of the parameters and return type of the string.Join overload I want to use, and relies upon C#4's variance features because we are defining one of the arguments as IEnumerable rather than IEnumerable. The Challenge Can you find a neater way of achieving this using the method-chaining style of programming?

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  • Zend Navigation not working on dynamic pages

    - by azz0r
    XML Home default default index index Clips video clip index All video clip all 0-9 1 My bootstrap route: $router->addRoute('clips/page', new Zend_Controller_Router_Route('clips/:page', array('module' => 'video', 'controller' => 'clip', 'action' => 'all'))); The clips navigation works, but the all navigation doesnt have a crumb bar for /clips/1 Ideas?

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  • Doubts in ada language

    - by maddy
    HI all, I am a beginner in the ada language.I have an short piece of code.Can anyone please tel me what does it mean? type Myarr_Type is array (Character) of Character; Myarr : Myarr_Type; C1 : character := character'first; C2 : character := character'last; My question is 1)What does C1 and C2 contain according to the above code? Please do excuse if this is really silly.I dont have an ada compiler to check the contents of this variable Regards Maddy

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  • CSS "color" vs. "font-color"

    - by Fred Wilson
    Anyone know why CSS provides "color:" for text, but does not have "font-color:" or "text-color:"? Seems very counter-intuitive.. kind of like "text-decoration: bold" rather than "font-style: ". I must be new here. :o) Seriously, does anyone know why/how the w3c came up with such a wide array of CSS names like this?

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  • How to set arrayList size as null?

    - by Jessy
    String a []= {null,null,null,null,null}; //add array to arraylist ArrayList<Object> choice = new ArrayList<Object>(Arrays.asList(a)); System.out.println(choice.size()); Why the size of the arrayList choice is 5 when all the elements have been set to null

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  • To use AES with 256 bits in inbuild java 1.4 api.

    - by sahil garg
    I am able to encrypt with AES 128 but with more key length it fails. code using AES 128 is as below. import java.security.*; import javax.crypto.*; import javax.crypto.spec.*; import java.io.*; /** * This program generates a AES key, retrieves its raw bytes, and * then reinstantiates a AES key from the key bytes. * The reinstantiated key is used to initialize a AES cipher for * encryption and decryption. */ public class AES { /** * Turns array of bytes into string * * @param buf Array of bytes to convert to hex string * @return Generated hex string */ public static String asHex (byte buf[]) { StringBuffer strbuf = new StringBuffer(buf.length * 2); int i; for (i = 0; i < buf.length; i++) { if (((int) buf[i] & 0xff) < 0x10) strbuf.append("0"); strbuf.append(Long.toString((int) buf[i] & 0xff, 16)); } return strbuf.toString(); } public static void main(String[] args) throws Exception { String message="This is just an example"; // Get the KeyGenerator KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128); // 192 and 256 bits may not be available // Generate the secret key specs. SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); // Instantiate the cipher Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted =cipher.doFinal("welcome".getBytes()); System.out.println("encrypted string: " + asHex(encrypted)); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] original = cipher.doFinal(encrypted); String originalString = new String(original); System.out.println("Original string: " + originalString + " " + asHex(original)); } }

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  • stack.ToList() in .NET - order of elements?

    - by James M.
    When using the .ToList() extension method on a Stack<T>, is the result the same as popping each element and adding to a new list (reverse of what was pushed)? If so, is this because it really is iterating over each element, or does it store the elements in reverse internally and slip the array into a new List<T>?

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  • how does linear probing handle this?

    - by Weadadada Awda
    • the hash function: h(x) = | 2x + 5 | mod M • a bucket array of capacity N • a set of objects with keys: 12, 44, 13, 88, 23, 94, 11, 39, 20, 16, 5 (to input from left to right) 4.a [5 pts] Write the hash table where M=N=11 and collisions are handled using linear probing. So I got up to here x x x x x 44 88 12 23 13 94 but the next variable should go after the 94 now, (the 11) but does it start from the beggining or what? thx

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  • xml parsing in adobe alchemy

    - by cbs
    hello can you prvide an example how to parse xml file in adobe alchemy. im trying to work on expat, however i got no luck on passing of bytearrays to and from the c code. do i need to pass the byte array of file to the alchemy, or is it enough to pass the filename. thanks. cbs

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  • Any good libraries for parsing JSON in Classic ASP?

    - by Mark Biek
    I've been able to find a zillion libraries for generating JSON in Classic ASP (VBScript) but I haven't been to find ANY for parsing. I want something that I can pass a JSON string and get back a VBScript object of some sort (Array, Scripting.Dictionary, etc) Can anyone recommend a library for parsing JSON in Classic ASP?

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  • J: Self-reference in bubble sort tacit implementation

    - by Yasir Arsanukaev
    Hello people! Since I'm beginner in J I've decided to solve a simple task using this language, in particular implementing the bubblesort algorithm. I know it's not idiomatically to solve such kind of problem in functional languages, because it's naturally solved using array element transposition in imperative languages like C, rather than constructing modified list in declarative languages. However this is the code I've written: (((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # Let's apply it to an array: (((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # 5 3 8 7 2 2 3 5 7 8 The thing that confuses me is $: referring to the statement within the outermost parentheses. Help says that: $: denotes the longest verb that contains it. The other book (~ 300 KiB) says: 3+4 7 5*20 100 Symbols like + and * for plus and times in the above phrases are called verbs and represent functions. You may have more than one verb in a J phrase, in which case it is constructed like a sentence in simple English by reading from left to right, that is 4+6%2 means 4 added to whatever follows, namely 6 divided by 2. Let's rewrite my code snippet omitting outermost ()s: ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) ^: # 5 3 8 7 2 2 3 5 7 8 Reuslts are the same. I couldn't explain myself why this works, why only ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) is treated as the longest verb for $: but not the whole expression ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) ^: # and not just (<./@(2&{.)), $:@((>./@(2&{.)),2&}.), because if ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) is a verb, it should also form another verb after conjunction with #, i. e. one might treat the whole sentence (first snippet) as a verb. Probably there's some limit for the verb length limited by one conjunction. Look at the following code (from here): factorial =: (* factorial@<:) ^: (1&<) factorial 4 24 factorial within expression refers to the whole function, i. e. (* factorial@<:) ^: (1&<). Following this example I've used a function name instead of $:: bubblesort =: (((<./@(2&{.)), bubblesort@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # bubblesort 5 3 8 7 2 2 3 5 7 8 I expected bubblesort to refer to the whole function, but it doesn't seem true for me since the result is correct. Also I'd like to see other implementations if you have ones, even slightly refactored. Thanks.

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  • using php's libcurl to register user and upload file to server

    - by tunpishuang
    here is a site http://www.lyrkjsw.gov.cn that can let the registered user to upload file (e.g. images or office files) to the site. i want to register user and upload image to this site using libcurl binding with php. only registered user can upload image. so i use cookiejar stored in c:\cookie.txt after register and use c:\cookie.txt in uploadImg() function . register user is valid but failed to upload image , can anybody know is there any mistake of my code: <? /* options */ //the list url $expUrl='http://www.lyrkjsw.gov.cn/hbcms/user/list_resource.php'; //the user info to be registered $regUser='jiong'; $regPass='jiong'; $regMail='[email protected]'; $regUrl=str_replace('list_resource.php','register.php',$expUrl); // options for image upload $fileDir='@D:\img\b.jpg'; $fileTitle='aaaaaaaaaaaaa'; $fileDesc='aaaaaaaaaaaaadesc'; $uploadImgUrl=str_replace('list_resource.php','add_resource.php',$expUrl); /* register function */ function reg($regurl,$u,$p,$m) { $ch = curl_init(); $options=array( CURLOPT_URL=>$regurl, CURLOPT_RETURNTRANSFER=>true, CURLOPT_POST=>true, CURLOPT_POSTFIELDS=>'mod=register_now&next_url=index.php&addon_app=&referrer_id=&login_name='.$u.'&login_pass='.$p.'&confirm_login_pass='.$p.'&login_email='.$m.'&nickname=&gender=0&qq=&mobile=&telephone=&true_name=&website_name=&website_url=&my_question=&my_answer=', CURLOPT_COOKIESESSION=>true, CURLOPT_HEADER=>true, CURLOPT_COOKIEJAR=>'c:\cookie.txt' ); curl_setopt_array($ch,$options); $data = curl_exec($ch); if(strpos($data,'??')){ printf("register ok :)\n"); curl_close($ch); return true; }else{ printf("register failed:(\n"); curl_close($ch); return false; } } /* image uploading function */ function uploadImg($uploadimgurl,$filedir,$filetitle,$filedesc) { $ch = curl_init(); $options=array( CURLOPT_COOKIEFILE=>'c:\cookie.txt', CURLOPT_URL=>$uploadimgurl, CURLOPT_RETURNTRANSFER=>1, CURLOPT_POST=>1, CURLOPT_POSTFIELDS=>" 'MAX_FILE_SIZE'='33554432'& 'preview_area_id'='upload_file'& 'editor_area_id'='body'& 'js_function'=''& 'resource_id'=''& 'show_top_part'='no'& 'file_1'=$filedir& 'file_title_1'=$filetitle& 'file_desc_1'=$filedesc " ); curl_setopt_array($ch,$options); $data = curl_exec($ch); if(strpos($data,'??')){ printf("upload ok :)\n"); }else{ printf("upload failed :(\n"); } curl_close($ch); } if(reg($regUrl,$regUser,$regPass,$regMail) != false) { uploadImg($uploadImgUrl,$fileDir,$fileTitle,$fileDesc); } http://www.lyrkjsw.gov.cn/hbcms/user/list_resource.php (list file page) http://www.lyrkjsw.gov.cn/hbcms/user/register.php (register page) http://www.lyrkjsw.gov.cn/hbcms/user/add_resource.php (image uploading page)

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  • Uploading a picture to facebook

    - by kielie
    Hi guys, I am trying to upload a image to a gallery on a facebook fan page, here is my code thus far, $ch = curl_init(); $data = array('type' => 'client_cred', 'client_id' => 'app_id','client_secret'=>'secret_key',' redirect_uri'=>'http://apps.facebook.com/my-application/'); // your connect url here curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_URL, 'https://graph.facebook.com/oauth/access_token'); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, $data); $rs = curl_exec($ch); curl_close($ch); $ch = curl_init(); $data = explode("=",$rs); $token = $data[1]; $album_id = '1234'; $file= 'http://my.website.com/my-application/sketch.jpg'; $data = array(basename($file) => "@".realpath($file), //filename, where $row['file_location'] is a file hosted on my server "caption" => "test", "aid" => $album_id, //valid aid, as demonstrated above "access_token" => $token ); $ch2 = curl_init(); $url = "https://graph.facebook.com/".$album_id."/photos"; curl_setopt($ch2, CURLOPT_URL, $url); curl_setopt($ch2, CURLOPT_HEADER, false); curl_setopt($ch2, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch2, CURLOPT_RETURNTRANSFER, false); curl_setopt($ch2, CURLOPT_POST, true); curl_setopt($ch2, CURLOPT_POSTFIELDS, $data); $op = curl_exec($ch2); When I echo $token, I seem to be getting the token, but when I run the script, I get this error, {"error":{"type":"OAuthAccessTokenException","message":"An access token is required to request this resource."} , I have NO idea why it is doing this! Basically what I am doing in that code is getting the access token with curl, and then, uploading the photo to my album also via curl, but I keep getting that error! Any help would be appreciated, thank you!

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  • Zend Form not in place labbels values, how to move them that they will be exactly above text box?

    - by Yosef
    Hi, I have esthetic's problem. Zend Form not in place label value, how to move them that they will be exactly above text box, and not from left? (I didn't put filters and validation to make this code simpler here) Thanks, Yosef My Code Login.php form: public function init() { $username = new Zend_Form_Element_Text('username'); $username->setLabel("username"); $password = new Zend_Form_Element_Password('password'); $password->setLabel('password'); $this->addElements(array($username, $password)); }

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  • Threading in C#.

    - by Harsha
    Hello All, I have created an array of threads and started all of them. How to know whether all threads have completed work. I don't want to use thread.wait or thread.join. Thanks in advance. -Harsha

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  • How can arguments to variadic functions be passed by reference in PHP?

    - by outis
    Assuming it's possible, how would one pass arguments by reference to a variadic function without generating a warning in PHP? We can no longer use the '&' operator in a function call, otherwise I'd accept that (even though it would be error prone, should a coder forget it). What inspired this is are old MySQLi wrapper classes that I unearthed (these days, I'd just use PDO). The only difference between the wrappers and the MySQLi classes is the wrappers throw exceptions rather than returning FALSE. class DBException extends RuntimeException {} ... class MySQLi_throwing extends mysqli { ... function prepare($query) { $stmt = parent::prepare($query); if (!$stmt) { throw new DBException($this->error, $this->errno); } return new MySQLi_stmt_throwing($this, $query, $stmt); } } // I don't remember why I switched from extension to composition, but // it shouldn't matter for this question. class MySQLi_stmt_throwing /* extends MySQLi_stmt */ { protected $_link, $_query, $_delegate; public function __construct($link, $query, $prepared) { //parent::__construct($link, $query); $this->_link = $link; $this->_query = $query; $this->_delegate = $prepared; } function bind_param($name, &$var) { return $this->_delegate->bind_param($name, $var); } function __call($name, $args) { //$rslt = call_user_func_array(array($this, 'parent::' . $name), $args); $rslt = call_user_func_array(array($this->_delegate, $name), $args); if (False === $rslt) { throw new DBException($this->_link->error, $this->errno); } return $rslt; } } The difficulty lies in calling methods such as bind_result on the wrapper. Constant-arity functions (e.g. bind_param) can be explicitly defined, allowing for pass-by-reference. bind_result, however, needs all arguments to be pass-by-reference. If you call bind_result on an instance of MySQLi_stmt_throwing as-is, the arguments are passed by value and the binding won't take. try { $id = Null; $stmt = $db->prepare('SELECT id FROM tbl WHERE ...'); $stmt->execute() $stmt->bind_result($id); // $id is still null at this point ... } catch (DBException $exc) { ... } Since the above classes are no longer in use, this question is merely a matter of curiosity. Alternate approaches to the wrapper classes are not relevant. Defining a method with a bunch of arguments taking Null default values is not correct (what if you define 20 arguments, but the function is called with 21?). Answers don't even need to be written in terms of MySQL_stmt_throwing; it exists simply to provide a concrete example.

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  • perl script to scrape out sentences

    - by kivien
    Perl script that would scrape out sentences that mention 'Calvein Klein' in articles in a file named by $file. (Sentences can cross zero or more CR/LF characters.) Create an array of sentences scraped and print it at the end. Please anyone help me with that.

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  • Choosing suitable background / foreground colour using PHP

    - by Lizard
    I am looking to find a why to calculate a suitable background colour and a colour for the text that would go over the top, obviously I need to take into account readability and accessibility. I would need to pick the two colours from the array, the colours are stored in their hex representations. #CC9966 #996633 #FFCC99 #CCCC99 #000000 #333333 #666633 #663333 #CC9933 #FFCCCC I can use a PHP library like GD / imageMagick? Any suggestions (Please note I am using PHP)

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  • question about Doug Lea's malloc

    - by hatorade
    http://gee.cs.oswego.edu/dl/html/malloc.html in making his array for the segmented bins, he makes bins for 8 - 512 using multiples of 8 (so 63 bins, but only the last 62 are ever used). how does he determine the size for the remaining 63 bins? He mentions they are logarithmically spaced, but is there some sort of equation he used to do that optimally?

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  • longest string in texts

    - by davit-datuashvili
    ok i have meet following problem too for example there is given two text find longest string that occur in both i think we should cretate string array where we should put common srings and then compare their length and which length will be largest print it is there fast method?

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  • how to use new image folder in cakephp

    - by manish
    Hi sir, i am very new in cakephp.i have created a folder in app/webroot/. for image placing. eralier by default img folder cantain image. which i have used some thing like this " image('foldopen.png',array('width'=14,'height'='10','alt'='open'));? " now i have created new image folder insted of img folder. how to use this. please help me .its very urgent. Thanks Manish [email protected]

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