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  • Reading a file N lines at a time in ruby

    - by Sam
    I have a large file (hundreds of megs) that consists of filenames, one per line. I need to loop through the list of filenames, and fork off a process for each filename. I want a maximum of 8 forked processes at a time and I don't want to read the whole filename list into RAM at once. I'm not even sure where to begin, can anyone help me out?

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  • Why does explorer restart automatically when I kill it with Process.Kill?

    - by Thomas Levesque
    If I kill explorer.exe like this: private static void KillExplorer() { var processes = Process.GetProcessesByName("explorer"); Console.Write("Killing Explorer... "); foreach (var process in processes) { process.Kill(); process.WaitForExit(); } Console.WriteLine("Done"); } It restarts immediately. But if I use taskkill /F /IM explorer.exe, or kill it from the task manager, it doesn't restart. Why is that? What's the difference? How can I close explorer.exe from code without restarting it? Sure, I could call taskkill from my code, but I was hoping for a cleaner solution...

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  • Where is the PyGTK event stack?

    - by mkotechno
    You can know if the event stack is empty calling the gtk.events_pending() method, but I want to manipulate the pending events and filter it before the next gtk loop cycle, this data must be stored somewhere as an attribute or something, but where? Thanks.

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  • Check if BigInteger is not a perfect square

    - by Ender
    I have a BigInteger value, let's say it is 282 and is inside the variable x. I now want to write a while loop that states: while b2 isn't a perfect square: a ? a + 1 b2 ? a*a - N endwhile How would I do such a thing using BigInteger? EDIT: The purpose for this is so I can write this method. As the article states one must check if b2 is not square.

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  • Is there anything else I can do to optimize this MySQL query?

    - by Legend
    I have two tables, Table A with 700,000 entries and Table B with 600,000 entries. The structure is as follows: Table A: +-----------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number | bigint(20) unsigned | YES | | NULL | | +-----------+---------------------+------+-----+---------+----------------+ Table B: +-------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number_s | bigint(20) unsigned | YES | MUL | NULL | | | number_e | bigint(20) unsigned | YES | MUL | NULL | | | source | varchar(50) | YES | | NULL | | +-------------+---------------------+------+-----+---------+----------------+ I am trying to find if any of the values in Table A are present in Table B using the following code: $sql = "SELECT number from TableA"; $result = mysql_query($sql) or die(mysql_error()); while($row = mysql_fetch_assoc($result)) { $number = $row['number']; $sql = "SELECT source, count(source) FROM TableB WHERE number_s < $number AND number_e > $number GROUP BY source"; $re = mysql_query($sql) or die(mysql_error); while($ro = mysql_fetch_array($re)) { echo $number."\t".$ro[0]."\t".$ro[1]."\n"; } } I was hoping that the query would go fast but then for some reason, it isn't terrible fast. My explain on the select (with a particular value of "number") gives me the following: mysql> explain SELECT source, count(source) FROM TableB WHERE number_s < 1812194440 AND number_e > 1812194440 GROUP BY source; +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | 1 | SIMPLE | TableB | ALL | number_s,number_e | NULL | NULL | NULL | 696325 | Using where; Using temporary; Using filesort | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ 1 row in set (0.00 sec) Is there any optimization that I can squeeze out of this? I tried writing a stored procedure for the same task but it doesn't even seem to work in the first place... It doesn't give any syntax errors... I tried running it for a day and it was still running which felt odd. CREATE PROCEDURE Filter() Begin DECLARE number BIGINT UNSIGNED; DECLARE x INT; DECLARE done INT DEFAULT 0; DECLARE cur1 CURSOR FOR SELECT number FROM TableA; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; CREATE TEMPORARY TABLE IF NOT EXISTS Flags(number bigint unsigned, count int(11)); OPEN cur1; hist_loop: LOOP FETCH cur1 INTO number; SELECT count(*) from TableB WHERE number_s < number AND number_e > number INTO x; IF done = 1 THEN LEAVE hist_loop; END IF; IF x IS NOT NULL AND x>0 THEN INSERT INTO Flags(number, count) VALUES(number, x); END IF; END LOOP hist_loop; CLOSE cur1; END

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  • string parsing occurrence in c

    - by Dan74
    I have a string as const char *str = "Hello, this is an example of my string"; How could I get everything after the first comma. So for this instance: this is an example of my string I was planing to do something like: // pseudocode char *a, *b; loop { if((a = strchr(l, ',')) == NULL) break; b++; // but not sure here } printf("%s",a); Thanks

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  • is there a faster version of fminbnd in matlab?

    - by kloop
    I am now using fminbnd in Matlab, and I find it relatively slow (I am using it inside a nested loop). The function itself, its interface and the values it returns are great, but when looking into the .m file I see it is not optimized. As a matter of fact, I was hoping for something like that to be written as a mex. Anyone knows of an alternative to fminbnd which works much faster and does not have much overhead?

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  • Windows repair console, impossible?

    - by Daniel
    I found an old Windows XP SP2 in my -trash- cd can and tried it on a 30 GB FAT32 partition. Installation went fine till the copying operation was completed and XP asked for reboot. After that either it starts over again or throws invalid disk. Starting over is an infinite loop the only way I see is to choose the "Repair console" but I'm not used to a DOS box. Can anyone help me through this harmful installation?

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  • Ado.net Fill method not throwing error on running a Stored Procedure that does not exist.

    - by Mike
    I am using a combination of the Enterprise library and the original Fill method of ADO. This is because I need to open and close the command connection myself as I am capture the event Info Message Here is my code so far // Set Up Command SqlDatabase db = new SqlDatabase(ConfigurationManager.ConnectionStrings[ConnectionName].ConnectionString); SqlCommand command = db.GetStoredProcCommand(StoredProcName) as SqlCommand; command.Connection = db.CreateConnection() as SqlConnection; // Set Up Events for Logging command.StatementCompleted += new StatementCompletedEventHandler(command_StatementCompleted); command.Connection.FireInfoMessageEventOnUserErrors = true; command.Connection.InfoMessage += new SqlInfoMessageEventHandler(Connection_InfoMessage); // Add Parameters foreach (Parameter parameter in Parameters) { db.AddInParameter(command, parameter.Name, (System.Data.DbType)Enum.Parse(typeof(System.Data.DbType), parameter.Type), parameter.Value); } // Use the Old Style fill to keep the connection Open througout the population // and manage the Statement Complete and InfoMessage events SqlDataAdapter da = new SqlDataAdapter(command); DataSet ds = new DataSet(); // Open Connection command.Connection.Open(); // Populate da.Fill(ds); // Dispose of the adapter if (da != null) { da.Dispose(); } // If you do not explicitly close the connection here, it will leak! if (command.Connection.State == ConnectionState.Open) { command.Connection.Close(); } ... Now if I pass into the variable StoredProcName = "ThisProcDoesNotExists" And run this peice of code. The CreateCommand nor da.Fill through an error message. Why is this. The only way I can tell it did not run was that it returns a dataset with 0 tables in it. But when investigating the error it is not appearant that the procedure does not exist. EDIT Upon further investigation command.Connection.FireInfoMessageEventOnUserErrors = true; is causeing the error to be surpressed into the InfoMessage Event From BOL When you set FireInfoMessageEventOnUserErrors to true, errors that were previously treated as exceptions are now handled as InfoMessage events. All events fire immediately and are handled by the event handler. If is FireInfoMessageEventOnUserErrors is set to false, then InfoMessage events are handled at the end of the procedure. What I want is each print statement from Sql to create a new log record. Setting this property to false combines it as one big string. So if I leave the property set to true, now the question is can I discern a print message from an Error ANOTHER EDIT So now I have the code so that the flag is set to true and checking the error number in the method void Connection_InfoMessage(object sender, SqlInfoMessageEventArgs e) { // These are not really errors unless the Number >0 // if Number = 0 that is a print message foreach (SqlError sql in e.Errors) { if (sql.Number == 0) { Logger.WriteInfo("Sql Message",sql.Message); } else { // Whatever this was it was an error throw new DataException(String.Format("Message={0},Line={1},Number={2},State{3}", sql.Message, sql.LineNumber, sql.Number, sql.State)); } } } The issue now that when I throw the error it does not bubble up to the statement that made the call or even the error handler that is above that. It just bombs out on that line The populate looks like // Populate try { da.Fill(ds); } catch (Exception e) { throw new Exception(e.Message, e); } Now even though I see the calling codes and methods still in the Call Stack, this exception does not seem to bubble up?

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  • Problem in implementing IAlertUpdateHandler interface

    - by TheVillageIdiot
    I've implemented IAlertUpdateHandler interface in a class and used it for handling creation and updating of alerts. The code is fired but it goes into endless loop by calling itself again and again. Actually I want to suppress email notification so I'm calling a.Update(false); but this again calls PreUpdate or PostUpdate method and there is StackOverFlowException :( I've tried returning true/false from both the methods but nothing is helping.

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  • ArrayIndexOutOfBounds exception in CoyoteAdapter.normalize()

    - by Alex
    I'm working with an application that uses Tomcat 5.0.28 for sending and receiving AS2 messages. At times, it's throwing the following exception on receiving an MDN receipt for a transmission: An exception or error occurred in the container during the request processing java.lang.ArrayIndexOutOfBoundsException: 0 at org.apache.coyote.tomcat5.CoyoteAdapter.normalize(CoyoteAdapter.java:483) at org.apache.coyote.tomcat5.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:239) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:158) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) at java.lang.Thread.run(Unknown Source) I've found a report of this issue regarding v. 5.0.25 (here), with a followup note that it was resolved in 5.0.27. However, as above, the version number used in this app is 5.0.28. Any suggestions for how to find out what might be triggering this error?

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  • Monorail - Form submission using GET instead of POST

    - by Septih
    Hello, I'm writing some additions to a Castle MonoRail based site involving an Add and an Edit form. The add form works fine and uses POST but the edit form uses GET. The only major difference I can see is that the edit method is called with the Id of the object being edited in the query string. When the submit button is pressed on the edit form, the only argument passed is this object Id again. Here is the code for the edit form: <form action="edit.ashx" method="post"> <h3>Coupon Description</h3> <textarea name="comments" width="200">$comments</textarea> <br/><br/> <h3>Coupon Actions</h3> <br/> <div>Give Stories</div> <ul class="checklist" style="overflow:auto;height:144px;width:100%"> #foreach ($story in $stories.Values) <li> <label> #set ($associated = "") #foreach($storyId in $storyIds) #if($story.Id == $storyId) #set($associated = " checked='true'") #end #end <input type="checkbox" name="chk_${story.Id}" id="chk_${story.Id}" value="true" class="checkbox" $associated/> $story.Name </label> </li> #end </ul> <br/><br/> <div>Give Credit Amount</div> <input type="text" name="credit" value="$credit" /> <br/><br/> <h3>Coupon Uses</h3> <input type="checkbox" name="multi" #if($multi) checked="true" #end /> Multi-Use Coupon?<br/><br/> <b>OR</b> <br/> <br/> Number of Uses per Coupon: <input type="text" name="uses" value="$uses" /> <br/> <input type="submit" name="Save" /> </form> The differences between this and the add form is the velocity stuff to do with association and the values of the inputs being from the PropertyBag. The Method dealing with this on the controller starts like this: public void Edit(int id) { Coupon coupon = Coupon.GetRepository(User.Site.Id).FindById(id).Value; if(coupon == null) { RedirectToReferrer(); return; } IFutureQueryOfList<Story> stories = Story.GetRepository(User.Site.Id).OnlyReturnEnabled().FindAll("Name", true); if (Params["Save"] == null) { ... } } It reliably gets called but a breakpoint on the Params["Save"] lets me see that the HttpMethod is "GET" and the only arguments passed (In the Form and the Request) are the object Id and additional HTTP headers. At the end of the day I'm not that familiar with MonoRail and this may be a stupid mistake on my behalf, but I would very much appreciate being made a fool out of if it fixes the problem! :) Thanks

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  • Using PowerShell, in Active Direcotry, how would I change all the DNS A records that have a given IP to a new IP?

    - by djsumdog
    We've been moving data centers and I have a lot of old records that were not correctly but in DNS as CNAME records, but A records that have a direct IP (e.g. 192.168.100.n) and they're all moving to a new subnet (10.19.100.n). I just need to write a powershell script to change all those records. I found this site: http://www.indented.co.uk/index.php/2008/12/30/administering-microsoft-dns-in-powershell/ and from it I made this simple script: $dnsServer = "meldc2" $scope = New-Object Management.ManagementScope("\\$dnsServer\root\MicrosoftDNS") $path = New-Object Management.ManagementPath("MicrosoftDNS_Zone") $options = New-Object Management.ObjectGetOptions($Null,[System.TimeSpan]::MaxValue, $True) $ZoneClass= New-Object Management.ManagementClass($scope,$path,$options) $Zones = Get-WMIObject -Computer $dnsServer -Namespace "root\MicrosoftDNS" -Class "MicrosoftDNS_Zone" $Zones | Get-Member foreach($Z in $Zones) { $Z | Select-Object Name,DsIntegrated,ZoneType,Reverse,Data } but that only gets me a listing of root zones. I don't understand how to iterate over all the entries in each of the zones. Also, all the examples I've seen involve adding new zones, but there aren't any examples I can find on modifying existing A records.

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  • Cannot force https on certain pages using mod rewrite

    - by Demian
    force https RewriteCond %{HTTPS} =off [NC] RewriteCond %{REQUEST_URI} ^/?(bingo/account|bank)(.*)$ RewriteRule ^.*$ https://%{HTTP_HOST}/%1 [R=301,L] RewriteCond %{HTTPS} =on [NC] RewriteCond %{REQUEST_URI} !^/?(bingo/account|bank).*$ RewriteRule ^.*$ http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L] it's a nightmare, when i go to /bank i get a redirect loop error or weird redirects, in fact, not the expected behavior, what should i do?

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  • jumping lines in a file using c

    - by Nadav Stern
    hello i am trying to sort a textual file using c programming language, in order to sort the file i am using a unique key, i need to be able to jump from line to line in order to sort the file , the problem is that i do not know if there is a command in c which let me jump from the first line to lets say the 20 line for example the only solution which i know for it is to use each time fscanf with a loop but this solution is not very effective thanks in advance for your time.

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  • Concept of GUI's - Centralized or decentralized

    - by wvd
    Hello all, Since a few months I've been learning Erlang, and now it was time to do some basic GUI. After some quick research I saw there was an interesting library called 'wxi' (based on Fudgets of Haskell) which uses a different approach on GUI's. No central loop, every widget processes it's own events and handles it's own data. What do you guys think about this? It looks like it kind of can be efficient in languages such as Erlang, and it's an interesting approach. William van Doorn

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  • Problem in implementing progress control using threading!

    - by Rakesh
    hello all, I am new to the concept of threading in C..so I find it difficult to implement that in my function...I have a simple application in which i want to display a progress bar at a particular place..In a particular funtion I will read files(in a for loop) for some manipulations(regarding my application) ...while its reading the files I want to display a progress bar...stating that its in process of reading files...I know it should be done using the concept of threading...but i am not quite sure how to do it..please help me with this

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  • Iphone sdk, How to post data to web server? anybody has example ?

    - by user352385
    Hi, guys, I want to post data to web server, like username and password, on the web server, I used PHP to echo yes or no, I attached all the code. Can anybody help me out, what is wrong with the code. Since it always says incorrect password or username. I tried to test the php code with username and password inside, it is working. So please help me. Thank you. Header file @interface kiksyloginViewController : UIViewController { IBOutlet UITextField *usernameField; IBOutlet UITextField *passwordField; IBOutlet UIButton *loginButton; } @property (nonatomic, retain) UITextField *usernameField; @property (nonatomic, retain) UITextField *passwordField; @property (nonatomic, retain) UIButton *loginButton; (IBAction) login: (id) sender; @end Implementation file #import "kiksyloginViewController.h" @implementation kiksyloginViewController @synthesize usernameField; @synthesize passwordField; @synthesize loginButton; (IBAction) login: (id) sender { NSString *post =[NSString stringWithFormat:@"username=%@&password=%@",usernameField.text, passwordField.text]; NSString *hostStr = @"http://localhost/userlogin.php"; hostStr = [hostStr stringByAppendingString:post]; NSData *dataURL = [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]]; NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding]; if([serverOutput isEqualToString:@"Yes"]){ UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Congrats" message:@"You are authorized " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [alertsuccess show]; [alertsuccess release]; } else { UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Username or Password Incorrect" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [alertsuccess show]; [alertsuccess release]; } } (void)didReceiveMemoryWarning { // Releases the view if it doesn’t have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren’t in use. } (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } (void)dealloc { [super dealloc]; } @end PHP file <?php //$Container = new Container ; $u = $_GET['username']; $pw =$_GET['password']; $check = "select username, password from user where username='$u' and password='$pw'"; function myDbconn() { mysql_connect("localhost", "root","") or die(); mysql_select_db("test") or die (mysql_error()); } myDbconn(); $login = mysql_query($check) or die (mysql_error()); //$run = DB()-select($check); if (mysql_num_rows($login)==1){ //$row = DB()-fetch($run); //$row = DB()-fetch($login); $row = mysql_fetch_assoc($login); echo 'yes'; exit; } else { echo 'No'; exit; } ?

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  • Different Apache log file for each subdomain?

    - by consolibyte
    Is it possible to configure Apache to use a different log file for each subdomain, even if all of the subdomains are within the same VirtualHost container? So, I have only one VirtualHost: <VirtualHost *:80> ServerName example.com ServerAlias test1.example.com test2.example.com test3.example.com </VirtualHost> And I want to end up with the following log files: /var/log/httpd-access_test1.log /var/log/httpd-access_test2.log /var/log/httpd-access_test3.log I know I can probably do this with a custom log format and split-logs, but I was wondering if there's a way to just have Apache do it for me.

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  • gcc memory alignment pragma

    - by aaa
    hello. Does gcc have memory alignment pragma, akin #pragma vector aligned in Intel compiler? I would like to tell compiler to optimize particular loop using aligned loads/store instructions. Thanks

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  • jQuery .live fireing multiple times!

    - by cstrzelc
    Greetings Guru's, This is a little hard to explain, but I'll give it a shot. I have a quick question regarding to the .live() function in JQuery. I'm going to simplify the example here. I have a page "index.php" that has a container "#display_files_container" which is populated with anchor links that are generated dynamically by a different page "process.php". The links are loaded into that same <div> when those links are selected based on the attributes of that link. See Examples: INDEX.PHP <html> <head><title>index.php</title> <!-- this function below loads process.php and passes it the dirid variable via post. I then use this post variable inside of process.php to pull other links from the database --> <script language="text/javascript"> $('.directory').live("click", function() { $('#display_files_container').load('plugins/project_files/process.php', {dirid: $(this).attr('dirid')}); }); </script> </head> <?php /*This code initial populates the link array so we have the first links populated before the users clicks for the first time*/ some code to fetch the $current_directory_list array from the database initially.... >? <body> <div id='display_files_container'> <?php /*Cycle through the array and echo out all the links which have been pulled from DB*/ for($i=0;$i<$current_directory_count;$i++) { echo "<a href='#' class='directory' dirid='".$current_directory_list[$i]['id']." '>".$current_directory_list[$i]['directory_name']. "</a> "; } ?> </div> </body> </html> PROCESS.PHP this file includes code to populate the $current_directory_list[] array from the database based on the post variable "$_POST['dirid']" that was sent from the .click() method in index.php. It then echo's the results out and we display them in the #display_files_container container. When you click on those links the process repeats. This works..... you can click though the directory tree and it loads the new links every time. However, it seems to want to .load() the process.php file many times over for one click. The number of times process.php is loaded seems to increase the more the links are clicked. So for example you can click on a link and firebug reports that process.php was loaded 23 times..... Eventually I would imagine I would record a stackoverflow. Please let me know if you have any ideas. Are there any ways that I can assure that .live() loads the process.php file only once? Thanks, -cs

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  • collect text file information using c#

    - by riad
    Dear all, I have a text file .let name is abc.txt .The file have info like this jani stay in USA karim stay in France fara stay in UK Now i need to collect the information.the name is as nameString and the address is addressString.I have to put those information on anywhere else.So, i need all the name and address in a for loop. Can anybody pls help me to collect this info. Thanks in advance Riad

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  • Easy way to check if item is in list?

    - by befall
    Hey guys, I'm writing a search algorithm in C++, and one of the things I need to do is have a few if statements that check cells above, below, left of, and right of. Each time a cell is found to be open and added to the stack, I want it added to a list of cells already checked. I want to be able to say in the if loop if(thisCell is not in checkedCells). Any simple ideas? Thanks!

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