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• Java - HtmlUnit - Unable to save HTML to file (in some cases)

  - by Walter White

  Hi all, I am having intermittent issues saving the response HTML in HtmlUnit. Caused by: java.io.IOException: Unable to save file:C:\ccview\PP50773_4.0_walter\TSC_hca\Applications\HCA_J2EE\HCA\target\HtmlUnitTests\single\1\com\pnc\tsc\hca\ui\test\SiteCrawler\crawlSiteAsProvider\10.SiteCrawler.crawl.html at com.pnc.tsc.hca.ui.util.GetUtil.save(GetUtil.java:128) at com.pnc.tsc.hca.ui.util.GetUtil.add(GetUtil.java:75) at com.pnc.tsc.hca.ui.util.GetUtil.click(GetUtil.java:49) at com.pnc.tsc.hca.ui.test.SiteCrawler.crawl(SiteCrawler.java:87) at com.pnc.tsc.hca.ui.test.SiteCrawler.crawl(SiteCrawler.java:61) at com.pnc.tsc.hca.ui.test.SiteCrawler.crawl(SiteCrawler.java:63) at com.pnc.tsc.hca.ui.test.SiteCrawler.crawl(SiteCrawler.java:63) at com.pnc.tsc.hca.ui.test.SiteCrawler.crawl(SiteCrawler.java:63) at com.pnc.tsc.hca.ui.test.SiteCrawler.crawl(SiteCrawler.java:54) at com.pnc.tsc.hca.ui.test.SiteCrawler.crawlSiteAsProvider(SiteCrawler.java:50) ... 15 more Caused by: java.lang.RuntimeException: java.io.IOException: The system cannot find the path specified at com.gargoylesoftware.htmlunit.html.XmlSerializer.getAttributesFor(XmlSerializer.java:165) at com.gargoylesoftware.htmlunit.html.XmlSerializer.printOpeningTag(XmlSerializer.java:126) at com.gargoylesoftware.htmlunit.html.XmlSerializer.printXml(XmlSerializer.java:83) at com.gargoylesoftware.htmlunit.html.XmlSerializer.printXml(XmlSerializer.java:93) at com.gargoylesoftware.htmlunit.html.XmlSerializer.printXml(XmlSerializer.java:93) at com.gargoylesoftware.htmlunit.html.XmlSerializer.asXml(XmlSerializer.java:73) at com.gargoylesoftware.htmlunit.html.XmlSerializer.save(XmlSerializer.java:55) at com.gargoylesoftware.htmlunit.html.HtmlPage.save(HtmlPage.java:2259) at com.pnc.tsc.hca.ui.util.GetUtil.save(GetUtil.java:126) ... 24 more Caused by: java.io.IOException: The system cannot find the path specified at java.io.WinNTFileSystem.createFileExclusively(Native Method) at java.io.File.createNewFile(File.java:883) at com.gargoylesoftware.htmlunit.html.XmlSerializer.createFile(XmlSerializer.java:216) at com.gargoylesoftware.htmlunit.html.XmlSerializer.getAttributesFor(XmlSerializer.java:160) ... 32 more Now, the parent directory exists and some other files have already been written to the directory. Looking at the filename, I don't see anything that would stand out as a red flag indicating the filename is bad. What can I do to correct this error? Thanks, Walter

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• How to find if an Oracle APEX session is expired

  - by Mathieu Longtin

  I have created a single-sign-on system for our Oracle APEX applications, roughly based on this tutorial: http://www.oracle.com/technology/oramag/oracle/09-may/o39security.html The only difference is that my master SSO login is in Perl, rather than another APEX app. It sets an SSO cookie, and the app can check if it's valid with a database procedure. I have noticed that when I arrive in the morning, the whole system doesn't work. I reload a page from the APEX app, it then sends me to the SSO page because the session was expired, I logon, and get redirected back to my original APEX app page. This usually works except first thing in the morning. It seems the APEX session is expired. In that case it seems to find the session, but then refuse to use it, and sends me back to the login page. I've tried my best to trace the problem. The "wwv_flow_custom_auth_std.is_session_valid" function returns true, so I'm assuming the session is valid. But nothing works until I remove the APEX session cookie. Then I can log back in easily. Anybody knows if there is another call that would tell me if the session is expired or not? Thanks

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• OCR: How to improve accuracy - existing libraries for removing non-text 'furniture', shapes, etc to

  - by Rob

  I want to remove rectangles etc that enclose text in a screenshot image, so that I can perform optical character recognition to get accurate text from the screenshot. Background: I doing this to extract data from a legacy application for use with other applications. This is the only way to get at this data as associated files are in a closed, proprietary, binary format. I will be using AutoItScript to drive the application to show data in its UI, then I will screenshot this and feed this to tesseract. I've already had some success in automating the UI, and have been able to use tesseract to get plain ascii text out of the bitmap. There are several AutoItScripr forum articles discussing its use with tesseract/OCR but not specifically for my question. http://www.autoitscript.com/forum/index.php?s=6c32c3ece12756e635a619cdf175eff9&showforum=2 What I need to do There are thin, 1-pixel wide rectangles that closely enclose some text, when fed to tesseract, it sees them as I for example for a verticle line of the rectangle. Any thoughts on how to remove the rectangles, or best practices? I'm asking if there is a generic command line based toolset to overwrite rectangles, for example, in .png files. I could then pass the .png through this, then pass it to tesseract. Details on the tesseract release/setup I've used are as follows: Go here: http://code.google.com/p/tesseract-ocr/downloads/list - For the basic english generic character set to get Tesseract up and running and recognising your bitmapped text into ascii text, use tesseract-2.00.eng.tar.gz (current version at time of writing is: "English language data for Tesseract (2.00 and up) Jul 2007 989 KB 84845") Related questions I have already looked at on Stack Overflow http://stackoverflow.com/questions/1335581/how-to-give-best-chance-of-success-to-an-ocr-software http://stackoverflow.com/questions/2296568/analysis-and-transformation-of-the-image-on-the-basis-of-this-analysis-for-better http://stackoverflow.com/questions/2268028/reading-characters-off-of-the-screen In these, my question is not completely answered or a commercial solution is being sold. I do not want to consider a commercial solution at this stage.

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• Simple iPhone drawing app with Quartz 2D

  - by Mr guy 4

  I am making a simple iPhone drawing program as a personal side-project. I capture touches event in a subclassed UIView and render the actual stuff to a seperate CGLayer. After each render, I call [self setNeedsLayout] and in the drawRect: method I draw the CGLayer to the screen context. This all works great and performs decently for drawing rectangles. However, I just want a simple "freehand" mode like a lot of other iPhone applications have. The way I thought to do this was to create a CGMutablePath, and simply: CGMutablePathRef path; -(void)touchBegan { path = CGMutablePathCreate(); } -(void)touchMoved { CGPathMoveToPoint(path,NULL,x,y); CGPathAddLineToPoint(path,NULL,x,y); } -(void)drawRect:(CGContextRef)context { CGContextBeginPath(context); CGContextAddPath(context,path); CGContextStrokePath(context); } However, after drawing for more than 1 second, performance degrades miserably. I would just draw each line into the off-screen CGLayer, if it were not for variable opacity! The less-than-100% opacity causes dots to be left on the screen connecting the lines. I have looked at CGContextSetBlendingMode() but alas I cannot find an answer. Can anyone point me in the right direction? Other iPhone apps are able to do this with very good efficiency.

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• Version control a content management system?

  - by Mike

  I have the following directory structure in the CMS application we have written: /application /modules /cms /filemanager /block /pages /sitemap /youtube /rss /skin /backend /default /css /js /images /frontend /default /css /js /images Application contains code specific to the current CMS implementation, i.e code for this specific cms. Modules contain reusable portions of code that we share across projects, such as libraries to work with youtube or rss feeds. We include these as git submodules, so that we can update the module in any website and push the changes back across all other projects. It makes it really easy to apply a change to our code and distribute it. We wanted to turn the CMS into a module so we get the same benefit - we can run the entire project under source control, then update the cms as required through a git-submodule. We have run into a problem however: the cms requires javascript/images/css in order for it to work correctly. Things we have thought about: We could create 2 submodules, one for cms-skin and one for cms, but this means you cannot "git pull" one version without having some idea of which versions of skin work with which versions of cms. i.e version 1.2.2 CMS might have issues with 1.0.3 CMS-Skin We could add the skin to the cms module but this has the following problems: Skin should be available on the document root, module code shouldn't be, and if it is it should probably be secured via .htaccess It doesn't seem to make any sense bundling assets with php code We could create a symlink between /skin/backend/ to go to /modules/cms/skin but does this cause any security problems, and do we want to require something like a symlink for the application to work? We could create a hook for git or a shell script that copies files from modules/cms/skin to skin/backend when an update occurs, but this means we lose the ability to edit CMS core files in a project then push them back How is this typically done in large scale cms's? How is it possible to get the source code for a cms under version control, work on the application for a client, then update the sourcecode as releases and given by the vendor? How do applications like Magento or Drupal do this?

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• iPhone Keychain Questions

  - by AO

  Some questions: * Is there some way to view the data present in the iPhone keychain? * The items an application adds, cannot be accessed by any other application, can it? * What is the purpose of the identifier and access group in the initialization? My guess is that the identifier is simply used to find items but I'm a little bit unsure of the access group. If the access group is assigned nil, all applications can access the items? If the access group is assigned X, could the items be accessed by another application with the same string X as access group or what is the purpose of the access group in this case? * Is the data in the keychain removed when the application is removed? If not, how do I achieve that? And finally: I can't get the KeychainItemWrapper (Apple example) to work. I've added the KeychainItemWrapper files to my project and when running it on the phone, an exception is thrown by SecItemAdd, saying that one or more parameters were not valid (result code -50). The code triggering the SecItemAdd follows: KeychainItemWrapper* wrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@"something" accessGroup:@"com.company.whatever"]; [wrapper setObject:@"this is my password" forKey:@"password"]; NSLog(@"Password: %@", [wrapper objectForKey:@"password"]); The code can be found at http://developer.apple.com/iphone/library/samplecode/GenericKeychain/index.html

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• Defining reliable SIlverlight 4 architecture

  - by doteneter

  Hello everybody, It's my first question on SO. I know that there were many topics on Silverlight and architecture but didn't find answers that satisfies me. I'm ASP.NET MVC developer and are used to work on architectures built with the best practices (loose coupling with DI, etc.) Now I'm faced to the new Silverlight 4 project and would like to be sure I'm doing the best choices as I'm not experienced. Main features required by the applications are as follows : use existing SQL Server Database but with possibility to move to the cloud. using EF4 for the data acess with SQL Server. exitensibility : adding new modules without changing the main host. loose coupling. I was looking at different webcasts (Taulty, etc.), blogs about Silverlight and came up with the following architecture. EF 4 for data access (as specified with the requirements) WCF RIA Services for mid-tiers controling access to data for queries and enabling end-to-end support for data validation, authentication and roles. MEF Support for enabling modules. Unity 2.0 for DI. The problem is that I don't know how to define a reliable architecture where all these elements play well together. Should I use a framework instead like Prism or Caliburn? But for now I'm not sure what scenarios they support. What's the best usages for Unity in Silverlight ? I used to use IoC in ASP.NET MVC for loos coupling and other things like interception for audit logging. It seems that for Silverlight Unity doesn't support Interception. I would like to use it to enable loose coupling and to enable to move to the cloud if needed. Thanks in advance for your help.

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• Reverse engineering and patching a DirectX game?

  - by yodaj007

  Background I am playing Imperishable Night, one of the Touhou series of games. The shoot button is 'z', moving slower is 'shift', and the arrow keys move. Unfortunately for me, using shift-z ghosts my right arrow key, so I can't move to the right while shooting. This ghosting happens in all applications, and switching keyboards fixes it. Goal I want to locate in the disassembled code the directx function that gets the keyboard input and compares it against the 'z' key, and change that key to 'a'. I'm considering this a fun project. Assuming the size of the scan codes are the same, this should be fairly simple. And because the executable is only 400k, maybe this will provide a unique opportunity for me to explore the dark side of the computing underworld (kidding). Relevant experience I have some experience with coding in assembly, but not in the disassembly of such. I have no experience with the DirectX apis. Question I need some guidance. I've found a listing of directx keyboard scan codes, and a program called PEExplorer that looks like it will do what I need. Is there a means by which I can turn some of the assembly with C function calls so it's more easily read? I will need to locate where the game retrieves the currently pressed keys, compares those against a list, and it's that list I need to modify. Any input would be greatly appreciated.

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• What's slowing for loops/assignment vs. C?

  - by Lee

  I have a collection of PHP scripts that are extremely CPU intensive, juggling millions of calculations across hundreds of simultaneous users. I'm trying to find a way to speed up the internals of PHP variable assignment, and looping sequences vs C. Although PHP is obviously loosely typed, is there any way/extension to specifically assign type (assign, not cast, which seems even more expensive) in a C-style fashion? Here's what I mean. This is some dummy code in C: #include <stdio.h> int main() { unsigned long add=0; for(unsigned long x=0;x<100000000;x++) { add = x*59328409238; } printf("x is %ld\n",add); } Pretty self-explanatory -- it loops 100 million times, multiples each iteration by an arbitrary number of some 59 billion, assigns it to a variable and prints it out. On my Macbook, compiling it and running it produced: lees-macbook-pro:Desktop lee$ time ./test2 x is 5932840864471590762 real 0m0.266s user 0m0.253s sys 0m0.002s Pretty darn fast! A similar script in PHP 5.3 CLI... <?php for($i=0;$i<100000000;$i++){ $a=$i*59328409238; } echo $a."\n"; ?> ... produced: lees-macbook-pro:Desktop lee$ time /Applications/XAMPP/xamppfiles/bin/php test3.php 5.93284086447E+18 real 0m22.837s user 0m22.110s sys 0m0.078s Over 22 seconds vs 0.2! I realize PHP is doing a heck of a lot more behind the scenes than this simple C program - but is there any way to make the PHP internals to behave more 'natively' on primitive types and loops?

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• Passing binary blob through an Android content provider

  - by velocityb0y

  I have a content provider that is custom to my set of Android applications, and one of the things it needs to expose is a small (20-30k) byte array. The uri for these blobs looks like content://my.authority/blob/# where # is the row number; the resulting cursor has the standard _id column and a data column. I'm using a MatrixCursor in the provider's query method: byte[] byteData = getMyByteData(); MatrixCursor mc = new MatrixCursor(COLUMNS); mc.addRow(new Object[] { id, byteData }); Later, in the application consuming the data, I do Cursor c = managedQuery(uri, null, null, null, null); c.moveToFirst(); byte[] data = c.getBlob(c.getColumnIndexOrThrow("data")); However, data does not contain the contents of my original byte array; rather, it contains something like "[B@435cc518", which looks more like the address of the array than the contents. I tried wrapping the byte array in an implementation of java.sql.Blob, figuring that it might be looking for that since the content provider subsystem was written to be easy to use with SQLite, but it didn't help. Has anyone gotten this to work? If the data was in the file system, there are methods in ContentProvider that I could use to provide a marshalled InputStream to the client, but the data I'm trying to send back lives as a resource in the content provider's APK.

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• How to speed up WPF programs?

  - by Sam

  I love programming with and for Windows Presentation Framework. Mostly I write browser-like apps using WPF and XAML. But what really annoys me is the slowness of WPF. A simple page with only a few controls loads fast enough, but as soon as a page is a teeny weeny bit more complex, like containing a lot of data entry fields, one or two tab controls, and stuff, it gets painful. Loading of such a page can take more than one second. Seconds, indeed, especially on not so fast computers (read: the customers computers) it can take ages. Same with changing values on the page. Everything about the WPF UI is somehow sluggy. This is so mean! They give me this beautiful framework, but make it so excruciatingly slow so I'll have to apologize to our customers all the time! My Question: How do you speed up WPF? How do you profile bottlenecks? How do you deal with the slowness? Since this seems to be an universal problem with WPF, I'm looking for general advice, useful for many situations and problems. Some other related questions: What tools do you use for WPF development Tools to develop WPF or Silverlight applications

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• Need advice or pointers on Release Management Strategies

  - by Murray

  I look after an internal web based (Java, JSP, Mediasurface, etc.) system that is in constant use (24/5). Users raise tickets for enhancements, bug fixes and other business changes. These issues are signed off individually and assigned to one of three or four developers. Once the issue is complete it is built and the code only committed to SVN. The changed files (templates, html, classes, jsp) are then copied to a dev server and committed to a different repository from where they are checked out to the UAT server for testing. (this often requires the Tomcat service to be restarted and occasionally the Mediasurface service as well). The users then test and either reject or approve the release. If approved the edited files are checked out to the Live server and the same process as with UAT undertaken. If rejected the developer makes the relevant changes and starts the release process again. This is all done manually without much control. Where different developers are working on similar files, changes sometimes get overwritten by builds done on out of sync code in other cases changes in UAT are moved to live in error as they are mixed up in files associated with a signed off release. I would like to move this to a more controlled and automated process where all source code and output files are held in SVN and releases to Dev, UAT and Live managed by a CI system (We have TeamCity in house for our .NET applications). My question is on how to manage the releases of multiple changes where some will be signed off and moved on and others rejected and returned to the developer. The changes may be on overlapping files and simply merging each release in to a Release Branch means that the rejected changes would have to be backed out of the branch. Is there a way to manage this using SVN and CI or will I simply have to live with the current system.

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• Ipad MPMovieplayerController video loads but automatically pauses when played

  - by slayerIQ

  Hello I am trying to get the MPMovieplayerController to work. I load a video everything goes wel i even see the first frame but then it automatically pauses, if i press play it pauses again. In the simulator it works perfectly but on the ipad device it gives the problem. I can even seek through the video and i see the frame i seeked to but nothing plays. This is some output from the console: 2010-06-08 22:16:13.145 app[3089:207] Using two-stage rotation animation. To use the smoother single-stage animation, this application must remove two-stage method implementations. [Switching to thread 12803] warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/VCH263.videodecoder" (file not found). warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/H264H2.videodecoder" (file not found). warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/MP4VH2.videodecoder" (file not found). warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/JPEGH1.videodecoder" (file not found). 2010-06-08 22:16:15.145 app[3089:207] setting file:///private/var/mobile/Applications/46CE5456-6338-4BBF-A560-DCEFF700ACE0/tmp/MediaCache/ I dont get those warning when using the simulator BTW. Does anyone know how to fix this ?

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• Preventing Flex application caching in browser (multiple modules)

  - by Simon_Weaver

  I have a Flex application with multiple modules. When I redeploy the application I was finding that modules (which are deployed as separate swf files) were being cached in the browser and the new versions weren't being loaded. So i tried the age old trick of adding ?version=xxx to all the modules when they are loaded. The value xxx is a global parameter which is actually stored in the host html page: var moduleSection:ModuleLoaderSection; moduleSection = new ModuleLoaderSection(); moduleSection.visible = false; moduleSection.moduleName = moduleName + "?version=" + MySite.masterVersion; In addition I needed to add ?version=xxx to the main .swf that was being loaded. Since this is done by HTML I had to do this by modifying my AC_OETags.js file as below : function AC_FL_RunContent(){ var ret = AC_GetArgs ( arguments, ".swf?mv=" + getMasterVersion(), "movie", "clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" , "application/x-shockwave-flash" ); AC_Generateobj(ret.objAttrs, ret.params, ret.embedAttrs); } This is all fine and works great. I just have a hard time believing that Adobe doesn't already have a way to handle this. Given that Flex is being targeted to design modular applications for business I find it especially surprising. What do other people do? I need to make sure my application reloads correctly even if someone has once per session selected for their 'browser cache checking policy'.

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• MySQL performance - 100Mb ethernet vs 1Gb ethernet

  - by Rob Penridge

  Hi All I've just started a new job and noticed that the analysts computers are connected to the network at 100Mbps. The ODBC queries we run against the MySQL server can easily return 500MB+ and it seems at times when the servers are under high load the DBAs kill low priority jobs as they are taking too long to run. My question is this... How much of this server time is spent executing the request, and how much time is spent returning the data to the client? Could the query speeds be improved by upgrading the network connections to 1Gbps? (Updated for the why): The database in question was built to accomodate reporting needs and contains massive amounts of data. We usually work with subsets of this data at a granular level in external applications such as SAS or Excel, hence the reason for the large amounts of data being transmitted. The queries are not poorly structured - they are very simple and the appropriate joins/indexes etc are being used. I've removed 'query' from the Title of the post as I realised this question is more to do with general MySQL performance rather than query related performance. I was kind of hoping that someone with a Gigabit connection may be able to actually quantify some results for me here by running a query that returns a decent amount of data, then they could limit their connection speed to 100Mb and rerun the same query. Hopefully this could be done in an environment where loads are reasonably stable so as not to skew the results. If ethernet speed can improve the situation I wanted some quantifiable results to help argue my case for upgrading the network connections. Thanks Rob

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• Web-based clients vs thick/rich clients?

  - by rudolfv

  My company is a software solutions provider to a major telecommunications company. The environment is currently IBM WebSphere-based with front-end IBM Portal servers talking to a cluster of back-end WebSphere Application Servers providing EJB services. Some of the portlets use our own home-grown MVC-pattern and some are written in JSF. Recently we did a proof-of-concept rich/thick-client application that communicates directly with the EJB's on the back-end servers. It was written in NetBeans Platform and uses the WebSphere application client library to establish communication with the EJB's. The really painful bit was getting the client to use secure JAAS/SSL communications. But, after that was resolved, we've found that the rich client has a number of advantages over the web-based portal client applications we've become accustomed to: Enormous performance advantage (CORBA vs. HTTP, cut out the Portal Server middle man) Development is simplified and faster due to use of NetBeans' visual designer and Swing's generally robust architecture The debug cycle is shortened by not having to deploy your client application to a test server No mishmash of technologies as with web-based development (Struts, JSF, JQuery, HTML, JSTL etc., etc.) After enduring the pain of web-based development (even JSF) for a while now, I've come to the following conclusion: Rich clients aren't right for every situation, but when you're developing an in-house intranet-based solution, then you'd be crazy not to consider NetBeans Platform or Eclipse RCP. Any comments/experiences with rich clients vs. web clients?

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• Threading 101: What is a Dispatcher?

  - by Water Cooler v2

  Once upon a time, I remembered this stuff by heart. Over time, my understanding has diluted and I mean to refresh it. As I recall, any so called single threaded application has two threads: a) the primary thread that has a pointer to the main or DllMain entry points; and b) For applications that have some UI, a UI thread, a.k.a the secondary thread, on which the WndProc runs, i.e. the thread that executes the WndProc that recieves messages that Windows posts to it. In short, the thread that executes the Windows message loop. For UI apps, the primary thread is in a blocking state waiting for messages from Windows. When it recieves them, it queues them up and dispatches them to the message loop (WndProc) and the UI thread gets kick started. As per my understanding, the primary thread, which is in a blocking state, is this: C++ while(getmessage(/* args &msg, etc. */)) { translatemessage(&msg, 0, 0); dispatchmessage(&msg, 0, 0); } C# or VB.NET WinForms apps: Application.Run( new System.Windows.Forms() ); Is this what they call the Dispatcher? My questions are: a) Is my above understanding correct? b) What in the name of hell is the Dispatcher? c) Point me to a resource where I can get a better understanding of threads from a Windows/Win32 perspective and then tie it up with high level languages like C#. Petzold is sparing in his discussion on the subject in his epic work. Although I believe I have it somewhat right, a confirmation will be relieving.

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• WPF Memory Leak on XP (CMilChannel, HWND)

  - by vanja.

  My WPF application leaks memory at about 4kb/s. The memory usage in Task Manager climbs constantly until the application crashes with an "Out of Memory" exception. By doing my own research I have found that the problem is discussed here: http://stackoverflow.com/questions/801589/track-down-memory-leak-in-wpf and #8 here: http://blogs.msdn.com/jgoldb/archive/2008/02/04/finding-memory-leaks-in-wpf-based-applications.aspx The problem described is: This is a leak in WPF present in versions of the framework up to and including .NET 3.5 SP1. This occurs because of the way WPF selects which HWND to use to send messages from the render thread to the UI thread. This sample destroys the first HWND created and starts an animation in a new Window. This causes messages sent from the render thread to pile up without being processed, effectively leaking memory. The solution offered is: The workaround is to create a new HwndSource first thing in your App class constructor. This MUST be created before any other HWND is created by WPF. Simply by creating this HwndSource, WPF will use this to send messages from the render thread to the UI thread. This assures all messages will be processed, and that none will leak. But I don't understand the solution! I have a subclass of Application that I am using and I have tried creating a window in that constructor but that has not solved the problem. Following the instructions given literally, it looks like I just need to add this to my Application constructor: new HwndSource(new HwndSourceParameters("MyApplication"));

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• How to dispose a Writeable Bitmap? (WPF)

  - by Mario

  Some time ago i posted a question related to a WriteableBitmap memory leak, and though I received wonderful tips related to the problem, I still think there is a serious bug / (mistake made by me) / (Confusion) / (some other thing) here. So, here is my problem again: Suppose we have a WPF application with an Image and a button. The image's source is a really big bitmap (3600 * 4800 px), when it's shown at runtime the applicaton consumes ~90 MB. Now suppose i wish to instantiate a WriteableBitmap from the source of the image (the really big Image), when this happens the applications consumes ~220 MB. Now comes the tricky part, when the modifications to the image (through the WriteableBitmap) end, and all the references to the WriteableBitmap (at least those that I'm aware of) are destroyed (at the end of a method or by setting them to null) the memory used by the writeableBitmap should be freed and the application consumption should return to ~90 MB. The problem is that sometimes it returns, sometimes it does not. Here is a sample code: // The Image's source whas set previous to this event private void buttonTest_Click(object sender, RoutedEventArgs e) { if (image.Source != null) { WriteableBitmap bitmap = new WriteableBitmap((BitmapSource)image.Source); bitmap.Lock(); bitmap.Unlock(); //image.Source = null; bitmap = null; } } As you can see the reference is local and the memory should be released at the end of the method (Or when the Garbage collector decides to do so). However, the app could consume ~224 MB until the end of the universe. Any help would be great.

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• C: Running Unix configure file in Windows

  - by Shiftbit

  I would like to port a few applications that I use on Linux to Windows. In particular I have been working on wdiff. A program that compares the differences word by word of two files. Currently I have been able to successfully compile the program on windows through Cygwin. However, I would like to run the program natively on Windows similar to the Project: UnixUtils. How would I go about porting unix utilities on a windows environment? My possible guess it to manually create the ./configure file so that I can create a proper makefile. Am I on the right track? Has anyone had experience porting GNU software to windows? Update: I've compiled it on Code::Blocks and I get two errors: wdiff.c|226|error: `SIGPIPE' undeclared (first use in this function) readpipe.c:71: undefined reference to `_pipe' readpipe.c:74: undefined reference to `_fork This is a linux signal that is not supported by windows... equvilancy? wdiff.c|1198|error: `PRODUCT' undeclared (first use in this function)| this is in the configure.in file... hardcode would probably be the fastest solution... Outcome: MSYS took care of the configure problems, however MinGW couldnt solve the posix issues. I attempt to utilize pthreads as recommended by mrjoltcola. However, after several hours I couldnt get it to compile nor link using the provided libraries. I think if this had worked it would have been the solution I was after. Special mention to Michael Madsen for MSYS.

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• signalR groups - connecting/disconnecting and sending - am I missing something?

  - by Terry_Brown

  very new to signalR, and have rolled up a very simple app that will take questions for moderation at conferences (felt like a straight forward use case) I have 2 hubs at the moment: - Question (for asking questions) - Speaker (these should receive questions and allow moderation, but that will come later) Solution lives at https://github.com/terrybrown/InterASK After watching a video (by David Fowler/Damian Edwards) (http://channel9.msdn.com/Shows/Web+Camps+TV/Damian-Edwards-and-David-Fowler-Demonstrate-SignalR) and another that I can't find the URL for atm, I thought I'd go with 'groups' as the concept to keep messages flowing to the right people. I implemented IConnected, IDisconnect as I'd seen in one of the videos, and upon debugging I can see Connect fire (and on reload I can see disconnect fire), but it seems nothing I do adds a person to a group. The signalR documentation suggests "Groups are not persisted on the server so applications are responsible for keeping track of what connections are in what groups so things like group count can be achieved" which I guess is telling me that I need to keep some method (static or otherwise?) of tracking who is in a group? Certainly I don't seem able to send to groups currently, though I have no problem distributing to anyone currently connected to the app and implementing the same JS method (2 machines on the same page). I suspect I'm just missing something - I read a few of the other questions on here, but none of them seem to mention IConnected/IDisconnect, which tells me these are either new (and nobody is using them) or that they're old (and nobody is using them). I know this could be considered a subjective question, though what I'm looking for is just a simple means of managing the groups so that I can do what I want to - send a question from one hub, and have people connected to a different hub receive it - groups felt the cleanest solution for this? Many thanks folks. Terry

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• How Do I Use jQuery/JavaScript To Open A Popup Window/Tab (ASPX Login Page) & Then Pass Values To Op

  - by Terry Robinson

  Hi All, We currently have two asp.net 2.x web applications and we need to perform the following functionality: From one application, we want to auto-login to the other web application automatically in a new tab; using the same browser instance/window. So the process is: Open New Window/Tab With Second System URL/Login Page Wait For Popup Window/Tab Page To Load (DOM Ready?) OnPopupDomReady { Get Usename, Password, PIN Controls (jQuery Selectors) and Populate In Code Then Click Login Button (All Programatically). } I am currently using JavaScript to Open the window as follows: <script type="text/javascript"> $(document).ready(function () { $('a[rel="external"]').click(function () { window.open($(this).attr('href')); return false; }); }); </script> I would like to use jQuery chaining functionality if possible to extent the method above so that I can attach a DOM Ready event to the popped up page and then use that event to call a method on the code behind of the popped up page to automatically login. Something similar to this (Note: The Following Code Sample Does Not Work, It Is Here To Try And Help Illustrate What We Are Trying To Achieve)... <script type="text/javascript"> $(document).ready(function () { $('a[rel="external"]').click(function () { window.open($(this).attr('href').ready(function () { // Use JavaScript (Pref. jQuery Partial Control Name Selectors) To Populate Username/Password TextBoxes & Click Login Button. }) }); }); </script> Our Architecture Is As Follows: We have the source for both products (ASP.NET WebSite[s]) and they are run under different app. pools in IIS. I hope this all makes sense, and if my plan is not going to work, please provide hints ;) Thanks All/Kind Regards, Terry Robinson.

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• Telerik MVC Combobox AutoComplete error

  - by Roachmans

  I am using the Telerik autocomplete option In the header: <script type="text/javascript"> function onAutoCompleteDataBinding(e) { var autocomplete = $('#AutoComplete').data('tAutoComplete'); autocomplete.dataBind(["Product 1", "Product 2", "Product 3"]} </script> In the body of the View: <%=Html.Telerik().AutoComplete() .Name("AutoComplete") .ClientEvents(events => events.OnDataBinding("onAutoCompleteDataBinding")) %> http://demos.telerik.com/aspnet-mvc/combobox/clientsidebinding I have managed to get this working on other applications and it is really quite simple. I have pasted this example on top to show that this one also bombs out on : this.trigger = new $t.list.trigger(this); Think i might have mixed up the .js files and now my auto complete is not working. Any sugesions which js files and in what order they must be for this to work right My Page master relevant parts: <body> <% Html.Telerik().ScriptRegistrar() .DefaultGroup(group => group .Add("MicrosoftAjax.js") .Add("MicrosoftMvcAjax.js") ); %> <div class="MainTableBody"> <asp:ContentPlaceHolder ID="ContentPlaceHolder" runat="server" /> </div> <% Html.Telerik().ScriptRegistrar().Render(); %> </body> </html> In my web.config <add namespace="Telerik.Web.Mvc.UI" /> Any help or comments would be greatly appreciated

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• How to solve "catastrophic failure" with 32-bit COM component in SysWOW64\cscript or wscript

  - by kcrumley

  I'm trying to run a VBScript script that uses a 7-year-old 3rd-party 32-bit COM component on Windows Server 2008 R2, with the command-line 32-bit script host, SysWOW64\cscript.exe. When I call CreateObject on the class, it appears to be successful, but the very first time I try to use a property or method (I've tried several different ones) on the object, it gives me the "catastrophic failure". I have identical results with SysWOW64\wscript.exe, except, of course, that my error message comes in a msgbox instead of the command-line window. I think this has to do specifically with the 64-bit scripting hosts because of the following: The equivalent Classic ASP script, calling the same component and using 95% of the same code, works correctly on the same server, with IIS configured to support 32-bit COM. The same VBScript works correctly on a 32-bit Windows XP machine and a 32-bit Windows Server 2003 machine. The component fails in exactly the same way on my 64-bit Windows 7 machine. My Google searches for solutions to this problem have mostly turned up a lot of different problems that were solved by putting the COM component into a toolbar in Visual Studio. Obviously, that solution doesn't apply here. My questions are: Is there a core problem that is always behind a "catastrophic failure" from a Windows scripting host calling a COM component? Is there a place in a configuration snap-in, or in the registry, where I need to make a change similar to the change I had to make to the IIS Application pool to "Enable 32-bit Applications"? Is there a general place in the Server 2008 R2 Event Viewer that I should be looking, to see if there are any more details on the failure, in case it turns out to be specific to this component? Thanks in advance.

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• Rules engine for spatial and temporal reasoning?

  - by John

  I have an application that receives a number of datums that characterize spatial / temporal processes. It then filters these datums and creates actions which are then sent to processes that perform the actions. Rinse and repeat. At present, I have a collection of custom filters that perform a lot of complicated spatial/temporal calculations. Many times as I discuss my system to individuals in my company, they ask if I'm using a rules engine. I have yet to find a rules engine that is able to reason well temporally and spatially. (Things like When are two entities ever close? Is entity A ever in region B? If entity C is near entity D but oriented backwards relative to C then perform action D.) I have looked at Drools, Cyc, Jess in the past (say 3-4 years ago). It's time to re-examine the state of the art. Any suggestions? Any standards that you know of that support this kind of reasoning? Any defacto standards? Any applications? Thanks!

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