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• How to run batched WCF service calls in Silverlight BackgroundWorker

  - by Simon

  Is there any existing plumbing to run WCF calls in batches in a BackgroundWorker? Obviously since all Silverlight WCF calls are async - if I run them all in a backgroundworker they will all return instantly. I just don't want to implement a nasty hack if theres a nice way to run service calls and collect the results. Doesnt matter what order they are done in All operations are independent I'd like to have no more than 5 items running at once Edit: i've also noticed (when using Fiddler) that no more than about 7 calls are able to be sent at any one time. Even when running out-of-browser this limit applies. Is this due to my default browser settings - or configurable also. obviously its a poor man's solution (and not suitable for what i want) but something I'll probably need to take account of to make sure the rest of my app remains responsive if i'm running this as a background task and don't want it using up all my connections.

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• Streaming input to System.Speech.Recognition.SpeechRecognitionEngine

  - by spurserh

  I am trying to do "streaming" speech recognition in C# from a TCP socket. The problem I am having is that SpeechRecognitionEngine.SetInputToAudioStream() seems to require a Stream of a defined length which can seek. Right now the only way I can think to make this work is to repeatedly run the recognizer on a MemoryStream as more input comes in. Here's some code to illustrate: SpeechRecognitionEngine appRecognizer = new SpeechRecognitionEngine(); System.Speech.AudioFormat.SpeechAudioFormatInfo formatInfo = new System.Speech.AudioFormat.SpeechAudioFormatInfo(8000, System.Speech.AudioFormat.AudioBitsPerSample.Sixteen, System.Speech.AudioFormat.AudioChannel.Mono); NetworkStream stream = new NetworkStream(socket,true); appRecognizer.SetInputToAudioStream(stream, formatInfo); // At the line above a "NotSupportedException" complaining that "This stream does not support seek operations." Does anyone know how to get around this? It must support streaming input of some sort, since it works fine with the microphone using SetInputToDefaultAudioDevice(). Thanks, Sean

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• WPF assign Z-Order of owned windows without changing focus.

  - by Kamiikoneko

  Hi, Due to OpenGL airspace issues I have several windows that are owned by the main window but look and act like controls. I also have some data readout/sort windows that show real-time data and need to be normal floating windows, also owned by the main window so that they remain floating above the main window even while operations are performed in the main window. The issue: I open a data readout window (normal window) and am watching data change. Then I click on a text box to enter a value in one of the windows that acts as a control due to airspace issues, and it becomes activated, covering up my data readout window. This is bad because the airspace window is supposed to act like it is part of the main window. I tried some tricks with Activation and Deactivation, and it looks ok but then editing the airspace window at all is impossible because WPF only lets me edit the activated window. How can I ask that normal data readout window to please stay above all other windows owned by the main window, but still let other windows receive focus?

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• C Programming - Convert an integer to binary

  - by leo

  Hi guys - i was hopefully after some tips opposed to solutions as this is homework and i want to solve it myself I am firstly very new to C. In fact i have never done any before, though i have previous java experience from modules at university. I am trying to write a programme that converts a single integer in to binary. I am only allowed to use bitwise operations and no library functions Can anyone possibly suggest some ideas about how i would go about doing this. Obviously i dont want code or anything, just some ideas as to what avenues to explore as currenty i am a little confused and have no plan of attack. Well, make that a lot confused :D thanks very much

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• TransactionScope and Connection Pooling

  - by Graham

  Hi, I'm trying to get a handle on whether we have a problem in our application with database connections using incorrect IsolationLevels. Our application is a .Net 3.5 database app using SQL Server 2005. I've discovered that the IsolationLevel of connections are not reset when they are returned to the connection pool (see here) and was also really surprised to read in this blog post that each new TransactionScope created gets its own connection pool assigned to it. Our database updates (via our business objects) take place within a TransactionScope (a new one is created for each business object graph update). But our fetches do not use an explicit transaction. So what I'm wondering is could we ever get into the situation where our fetch operations (which should be using the default IsolationLevel - Read Committed) would reuse a connection from the pool which has been used for an update, and inherit the update IsolationLevel (RepeatableRead)? Or would our updates be guaranteed to use a different connection pool seeing as they are wrapped in a TransactionScope? Thanks in advance, Graham

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• Does Multiple NSURLConnection make delay of performance?

  - by oksk

  Hi all~. I made a multi files downloader. I implemented NSURLConnection using NSOperationQueue. NSOpetationQueue has many NSURLConnection operations. and, set MaxConcurrentOperationCount to 10. I thought my code is right, But after run the project, it was wrong. there are some connection error has occured. files url were right. and file download was completed. but downloading files, occur "timed out" error. It is so serious. I tested it with 8 files, and those total size is only 3M. But total download time is 2minutes ~!!! one file download spends only a few second. (2~3 s) but multi files download occur many overburden!! (2 minutes) I don't know why it is... Do Anyone know what reason is?

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• glFramebufferTexture2D performance

  - by nornagon

  I'm doing heavy computation using the GPU, which involves a lot of render-to-texture operations. It's an iterative computation, so there's a lot of rendering to a texture, then rendering that texture to another texture, then rendering the second texture back to the first texture and so on, passing the texture through a shader each time. My question is: is it better to have a separate FBO for each texture I want to render into, or should I rather have one FBO and bind the target texture using glFramebufferTexture2D each time I want to change render target? My platform is OpenGL ES 2.0 on the iPhone.

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• Recommendations for keeping a build server updated

  - by gareth_bowles

  As a guy who frequently switches between QA, build and operations, I keep running into the issue of what to do about operating system updates on the build server. The dichotomy is the same on Windows, Linux, MacOS or any other o/s that can update itself via the internet: The QA team wants to keep the build server exactly as it is from the beginning of the product release cycle to the end, since installing updates could destabilize the server and means that successive builds aren't made against the same baseline. The ops team wants the software to be deployed on a system with all the latest security patches; this can mean that the software isn't deployed on exactly the same version of the o/s that it was built on. I usually mitigate this by taking release candidate builds and installing them on a test server that has a completely up-to-date o/s, repeating the automated tests that are run on the build server and doing some additional system level testing to make sure everything looks good before deployment. However, this seems inefficient to me; does anyone have a better way ?

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• putpixel with pyglet

  - by pts

  I'm new to pyglet. I'd like to change a pixel from black to white at each on_draw iteration. So after 1000 iterations, there should be exactly 1000 white pixels in the window. However, I'd like to avoid calling 1000 draw operations in on_draw for that. So I'd like to create an image, do an RGB putpixel on the image, and blit the image to the screen. How can I do that? The pyglet documentation, the examples and the source code aren't too helpful on this.

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• cancel a ASIHTTPRequest thread

  - by user262325

  Hello evryone I have some codes to use ASINetworkQueue as multi thread download ASINetworkQueue *networkQueue; [networkQueue setDelegate:self]; [networkQueue setRequestDidFinishSelector:@selector(requestDone:)]; [networkQueue setShowAccurateProgress:true]; NSURL *url = [NSURL URLWithString:s]; ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; [request setDownloadProgressDelegate:a]; [request setTag:index]; [request setTimeOutSeconds:10]; [request setDelegate:self]; [networkQueue addOperation:request]; [networkQueue go]; if I try to use the code below to cancel the thread with index k [[[networkQueue operations] objectAtIndex:k] cancel]; I notice all requests in ASINetworkQueue were cancelled and stop working. Welcome any comment Thanks interdev

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• ASP.NET Grid AjaxPanel Download Issue

  - by Mahesh

  Hi, I have a telerik grid which is performing operations like searching,sorting,filtering etc. To make customers happy, we put this control in an ajax panel for seamless experience. Now, we added a new functionality to the grid where the customer can download the entire row information as a csv file. As the response is a file, ajax panel is trying to parse the output and throwing the following exception: Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near '?'. Could you please help me in having both functionalities( Ajax and Download) in place without any error?? Thanks, Mahesh

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• Photoshop JSX script- CLOSE PHOTOSHOP!

  - by Geekay2

  How do I close photoshop using its javascript scripting language. (I am automaticly scripting a great deal of things, and I notice that for one reason or another, some of the ram is not releasing with each new task. My hopes are that after X ammount of operations, I will fully close photoshop, to free up the ram.. which it is eating up all of my 8 gigs, and after which then opens photoshop help and causes a huge failure (actually, to be honest it fills up my hard drive with junk till I get a "hard drive is full" message... (I think it is dumping the ram into virtual ram on my hard drive?)... what a mess)THANKS!!

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• known memory leaks in 3ds max?

  - by Denise

  I've set up a script in 3ds max to render a bunch of animations into frames. To do this, I open up a file with all of the materials, load an animation (as a bip) onto the figure, then render. We were seeing a problem where eventually the script would fail because it was unable to open the next file-- max had consumed all of the system memory. Closing max, of course, freed the memory, and we were able to continue with the script. I checked out the heapfree variable, hoping to see a memory leak within my script, hoping to see a memory leak within my own (maxscript) code-- but the amount of free space was the same after every animation. Then, it must be 3ds max which is consuming all of that memory. Nothing in max need be saved from animation to animation-- is there some way to get max to free that memory? (I've tried resetMaxFile() and manually deleting all of the objects in the scene). Is there any known sets of operations that cause max to grow out of control?

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• Boost asio async vs blocking reads, udp speed/quality

  - by Dolphin

  I have a quick and dirty proof of concept app that I wrote in C# that reads high data rate multicast UDP packets from the network. For various reasons the full implementation will be written in C++ and I am considering using boost asio. The C# version used a thread to receive the data using blocking reads. I had some problems with dropped packets if the computer was heavily loaded (generally with processing those packets in another thread). What I would like to know is if the async read operations in boost (which use overlapped io in windows) will help ensure that I receive the packets and/or reduce the cpu time needed to receive the packets. The single thread doing blocking reads is pretty straightforward, using the async reads seems like a step up in complexity, but I think it would be worth it if it provided higher performance or dropped fewer packets on a heavily loaded system. Currently the data rate should be no higher than 60Mb/s.

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• PDO::fetchAll vs. PDO::fetch in a loop

  - by Byron

  Just a quick question. Is there any performance difference between using PDO::fetchAll() and PDO::fetch() in a loop (for large result sets)? I'm fetching into objects of a user-defined class, if that makes any difference. My initial uneducated assumption was that fetchAll might be faster because PDO can perform multiple operations in one statement while mysql_query can only execute one. However I have little knowledge of PDO's inner workings and the documentation doesn't say anything about this, and whether or not fetchAll() is simply a PHP-side loop dumped into an array. Any help?

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• Calling IPrincipal.IsInRole on Windows 7

  - by adrianbanks

  We use NTLM auth in our application to determine whether a user can perform certain operations. We use the IPrincipal of their current Windows login (in WinForms applications), calling IsInRole to check for specific group memberships. To check that a user is a local administrator on the machine, we use: AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal); ... bool allowed = Thread.CurrentPrincipal.IsInRole(@"Builtin\Administrators") This works if the current user is the Administrator user, or is another user that is a member of the Builtin\Administrators group. In our testing on Windows 7, we have found that this no longer works as expected. The Administrator user still works fine, but any other user that is a member of the Builtin\Administrators group returns false for the IsInRole call. What could be causing this difference? I have a gut feeling that a default setting has changed somewhere (possible in gpedit), but cannot find anything that looks like the culprit.

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• What does transaction.commit() do when the flushmode is set manual in Hibernate?

  - by wei

  Here is a block of code in the Java Persistence with Hibernate book by Christian and Gavin, Session session = getSessionFactory().openSession(); session.setFlushMode(FlushMode.MANUAL); // First step in the conversation session.beginTransaction(); Item item = (Item) session.get(Item.class, new Long(123) ); session.getTransaction().commit(); // Second step in the conversation session.beginTransaction(); Item newItem = new Item(); Long newId = (Long) session.save(newItem); // Triggers INSERT! session.getTransaction().commit(); // Roll back the conversation! session.close();//enter code here I am confused that why the first step and second step need to be wrapped into two separate transactions? Since the flushmode is set manual here, no operations (suppose we ignore the insert here) will hit the database anyway. So why bother with transactions here? thanks

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• Best way of implementing a batch like operation in a RESTful architecture?

  - by Nirav

  Hello, We have a predominantly RESTful architecture for our product. This enables us to nicely implement almost all of the required functionality, except this new requirement thats come in. I need to implement a page which lets the user to large scale DB operations synchronously. They can stop the operation in between, if they realized they made a mistake (rather than waiting for it to complete and doing an undo operation) I was wondering if some one could give some pointers as to what would be the best way to implement such a functionality? Cheers! Nirav

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• Why is the unit test useful when the view is not unit testable in MVVM?

  - by BigTiger

  Why is the unit test useful when the view is not unit testable in MVVM? In MVVM, we have the models, view-models, and views. The claimed advantage is that MVVM can make the models and view=models unit testable. But all the three parties belong to the same application. If the views are not unit testable, why test the other two? Will unit testing the other two and leave one not tested improve the quality? Removing all the code-behind from the views sounds weird to me. How about the code-behind only handles the pure UI operations?

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• Howto add a changed file to an older (not last) commit in Git

  - by David Klein

  Hey, I changed several things over the last hour and committed them step by step. But I just realized I've forgot to add a changed file some commits ago. The Log looks like this: GIT TidyUpRequests u:1 d:0> git log commit fc6734b6351f6c36a587dba6dbd9d5efa30c09ce Author: David Klein <> Date: Tue Apr 27 09:43:55 2010 +0200 The Main program now tests both Webservices at once commit 8a2c6014c2b035e37aebd310a6393a1ecb39f463 Author: David Klein <> Date: Tue Apr 27 09:43:27 2010 +0200 ISBNDBQueryHandler now uses the XPath functions from XPath.fs too commit 06a504e277fd98d97eed4dad22dfa5933d81451f Author: David Klein <> Date: Tue Apr 27 09:30:34 2010 +0200 AmazonQueryHandler now uses the XPath Helper functions defined in XPath.fs commit a0865e28be35a3011d0b6091819ec32922dd2dd8 <--- changed file should go here Author: David Klein <> Date: Tue Apr 27 09:29:53 2010 +0200 Factored out some common XPath Operations Any ideas? :)

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• Apache/passenger/ree doesn't interpret .rb files

  - by Sergey

  I'm trying to get apache + passenger + ree to work. I think I did everything (except for setting up rails env - for now I wanna run just pure ruby) described here: http://rvm.beginrescueend.com/integration/passenger/ But when I try to go to localhost/test.rb it doesn't interpret that file and just download it. I don't know where should I look for mistakes, so here are a few files I think could be relevant: /var/log/apache2/error.log (these 2 lines are repeating) [Mon May 31 23:12:47 2010] [notice] Graceful restart requested, doing restart [Mon May 31 23:12:48 2010] [notice] Apache/2.2.14 (Ubuntu) PHP/5.3.2-1ubuntu4.2 with Suhosin-Patch Phusion_Passenger/2.2.11 configured -- resuming normal operations /etc/apache2/httpd.conf LoadModule passenger_module /home/sergey/.rvm/gems/ree-1.8.7-2010.01/gems/passenger-2.2.11/ext/apache2/mod_passenger.so PassengerRoot /home/sergey/.rvm/gems/ree-1.8.7-2010.01/gems/passenger-2.2.11 PassengerRuby /home/sergey/.rvm/bin/passenger_ruby /var/www/test.rb puts "test"

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• Killing a deadlocked Task in .NET 4 TPL

  - by Dan Bryant

  I'd like to start using the Task Parallel Library, as this is the recommended framework going forward for performing asynchronous operations. One thing I haven't been able to find is any means of forcible Abort, such as what Thread.Abort provides. My particular concern is that I schedule tasks running code that I don't wish to completely trust. In particular, I can't be sure this untrusted code won't deadlock and therefore I can't be certain if a Task I schedule using this code will ever complete. I want to stay away from true AppDomain isolation (due to the overhead and complexity of marshaling), but I also don't want to leave a Task thread hanging around, deadlocked. Is there a way to do this in TPL?

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• apache syslog-ng error logs and access logs

  - by uzumaki naruto

  I am trying to send all my apache logs to syslog-ng(on remote machine) which in turn writes to a file. so I configure syslog-ng this way source s_apache { unix-stream("/var/log/apache_log.socket" max-connections(512) keep-alive(yes)); }; filter f_apache { match("error"); }; destination df_custom { file("/var/log/custom.log"); }; log { source(s_apache); filter(f_apache); destination(df_custom); }; and add the following line to apache2.conf ErrorLog "|/usr/bin/logger -t 'apache' -u /var/log/apache_log.socket" but only logs being written to "/var/log/custom.log" are [Mon Jul 13 17:24:36 2009] [notice] caught SIGTERM, shutting down and [Mon Jul 13 17:26:11 2009] [notice] Apache/2.2.11 (Ubuntu) configured -- resuming normal operations I want all logs to be sent to custom.log..... Please help me.... where am I going wrong?

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• Performance of std::pow - cache misses???

  - by Eamon Nerbonne

  I've been trying to optimize a numeric program of mine, and have run into something of a mystery. I'm looping over code that performs thousands of floating point operations, and just 1 call to pow nevertheless, that call takes 5% of the time... That's not necessarily a critical issue, but it is odd, so I'd like to understand what's happening. When I profiled for cache misses, VS.NET 2010RC's profiler reports that virtually all cache misses are occurring in std::pow... so... what's up with that? Is there a faster alternative? I tried powf, but that's only slightly faster; it's still responsible for an abnormal number of cache misses. Why would a basic function like pow cause cache-misses?

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• ASP.NET website not working properly in mobile

  - by ria

  I have created a simple app with a page having a server side form, three fields and a button that submits and performs two operations - 1) adds the form fields to the database table 2) sends an email. Now everything works fine on the web browser on my machine but when I access the app through my mobile, the page does not seem to work. the UI and all are set but the button click functionality doesnt seem to be working and also the label which is set after a successful submit is already visible and showing the "thank you" message. Am i doing something wrong here? I have checked the app on Nokia Smartphone browser, android phone, and iphone simulator.

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