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• Concurrency Violation in NHibernate( c#) example

  - by vijaysylvester

  For quite some time , I was reading about the optimistic concurrency in NHibernate. If what i understood was correct then the below sample should hold good. Consider two transactions T1 and T2. When T1 and T2 are done simultaneously , the state(DB entries) gets updated with the values of the most latest update.(T1 or T2). Though it seems to be conceptually sound , how do i simulate this for the purpose of understanding and integration testing.? Can someone help me with a sample c# code.? Thanks , vijay

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• Write an add-on or greasemonkey script to "Ajaxify" webpages in Firefox?

  - by Shizhidi

  Hello. I stumbled upon this add-on which "Ajaxifies" parts of its target website. https://addons.mozilla.org/en-US/firefox/addon/51789 I have a similar need like this. I want only part of the webpage's DOM to update upon receiving click on a link, since the website has a rather unified page layout. I have no experiences in writing FF add-ons but I did some basic Ajax and DOM before. So I am looking for programming tips on how to implement "Ajaxification" in a GreaseMonkey script, preferably. If it's not possible, making an add-on is also a sound choice which I'm willing to learn. Thanks in advance!

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• HTML5 <video> callbacks?

  - by Andrew

  I'm working on a site for a client and they're insistent on using HTML5's video tag as the delivery method for some of their video content. I currently have it up and running with a little help from http://videojs.com/ to handle the Internet Explorer Flash fallback. One thing they've asked me to do is, after the videos finish playing (they're all a different length), fade them out and then fade a picture in place of the video --- think of it like a poster frame after the video. Is this even possible? Can you get the timecode of a currently playing movie via Javascript or some other method? I know Flowplayer (http://flowplayer.org/demos/scripting/grow.html) has an onFinish function, is that the route I should take in lieu of the HTML5 video method? Does the fact that IE users will be getting a Flash player require two separate solutions? Any input would be greatly appreciated. I'm currently using jQuery on the site, so I'd like to keep the solution in that realm if at all possible. Thanks!

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• Don't understand the typing of Scala's delimited continuations (A @cps[B,C])

  - by jkff

  I'm struggling to understand what precisely does it mean when a value has type A @cps[B,C] and what types of this form should I assign to my values when using the delimited continuations facility. I've looked at some sources: http://lamp.epfl.ch/~rompf/continuations-icfp09.pdf http://www.scala-lang.org/node/2096 http://dcsobral.blogspot.com/2009/07/delimited-continuations-explained-in.html http://blog.richdougherty.com/2009/02/delimited-continuations-in-scala_24.html but they didn't give me much intuition into this. In the last link, the author tries to give an explicit explanation, but it is not clear enough anyway. The A here represents the output of the computation, which is also the input to its continuation. The B represents the return type of that continuation, and the C represents its "final" return type—because shift can do further processing to the returned value and change its type. I don't understand the difference between "output of the computation", "return type of the continuation" and "final return type of the continuation". They sound like synonyms.

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• How to configure Multi-tenant plugin as single-tenant with Spring security plugin as resolver?

  - by Fabien Barbier

  I can create a secure, multi-tenant web app with Grails by : setup spring security plugin, setup Multi-tenant plugin (via multi-tenant install and multi-tenant-spring-security) update config.groovy : tenant { mode = "multiTenant" resolver.type = "springSecurity" } add : Integer userTenntId in User domain add a domain class for tenant Organization associate the tenants with Organization Edit BootStrap.groovy. Everything works fine in multi-tenant mode, but how to use mode = "singleTenant" ? This configuration sound not working : tenant { mode = "singleTenant" resolver.type = "springSecurity" } Edit : I try this config : tenant { mode = "singleTenant" resolver.type = "springSecurity" datasourceResolver.type = "config" dataSourceTenantMap { t1 = "jdbc:hsqldb:file:custFoo" t2 = "jdbc:hsqldb:file:custBar" } } But I get : ERROR errors.GrailsExceptionResolver - Executing action [list] of controller [org.example.TicketController] caused exception: java.lang.StackOverflowError and : Caused by: java.lang.StackOverflowError at org.grails.multitenant.springsecurity.SpringSecurityCurrentTenant.getTenantIdFromSpringSecurity(SpringSecurityCurrentTenant.groovy:50) at org.grails.multitenant.springsecurity.SpringSecurityCurrentTenant.this$2$getTenantIdFromSpringSecurity(SpringSecurityCurrentTenant.groovy) at org.grails.multitenant.springsecurity.SpringSecurityCurrentTenant$this$2$getTenantIdFromSpringSecurity.callCurrent(Unknown Source) at org.grails.multitenant.springsecurity.SpringSecurityCurrentTenant.get(SpringSecurityCurrentTenant.groovy:41) at com.infusion.tenant.spring.TenantBeanContainer.getBean(TenantBeanContainer.java:53) at com.infusion.tenant.spring.TenantMethodInterceptor.invoke(TenantMethodInterceptor.java:32) at $Proxy14.getConnection(Unknown Source)

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• Programmatically convert WAV

  - by kaykun

  Hi, I'm writing a file compressor utility in C++ that I want support for PCM WAV files, however I want to keep it in PCM encoding and just convert it to a lower sample rate and change it from stereo to mono if applicable to yield a lower file size. I understand the WAV file header, however I have no experience or knowledge of the actual sound data works. So my question is, would it be relatively easy to programmatically manipulate the "data" sub-chunk in a WAV file to convert it to another sample rate and change the channel number, or would I be much better off using an existing library for it? If it is, then how would it be done? Thanks in advance.

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• Cannot Debug Visual Basic 6 ActiveX Component On 64-bit OS

  - by Humanier

  Hi, The situation might sound a bit weird but I have to play with what I have. There's a Win2003 64-bit server OS and a legacy application written using Visual Studio 6. The app consists of two parts: ActiveX components written in VB6 and C++ code which uses them. I need to debug the components' code. I installed Visual Studio 6 on the server and I'm able to step into the component's code. Then I got following situation: 1) C++ code works until it needs to instantiate component A. 2) At this step we switch to VB6 and start debugging Component's A. 3) In the very beginning component A creates an instance of a class C exposed by component B. At this step VB6 debugger shows error message with title "OLEDB32.DLL" and following text: "Failed to load resource DLL C:\Program Files (x86)\Common Files\System\Ole DB\OLEDB32R.DLL" Additional information: The last step in initialization of the class C is opening an ADO connection to SQL server using OLEDB provider. I'd appreciate any ideas on how resolve this problem. Thanks in advance.

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• iPad Orientation Paradigm

  - by JustinXXVII

  I'm not a super awesome designer so this new paradigm has me a little cranky. The iPad is not supposed to have a standard orientation, and should/shall display screen contents at whichever orientation the user decides. This has me sort of stumped. I can keep my UI designed the way I want it in landscape mode, but switching to portrait, I just can't determine the best way to present app content. I know it's all speculation at this point, but what are the chances we can override the autoRotateToOrientation to only include the orientation of our choice? Apple ignored the HIG on a lot of issues for iPhone, including splash screens, saving state, etc. I know we can't really argue with Apple, but doesn't it sound slightly ridiculous to reject an app because it won't rotate to portrait? I've come a long way porting some code to iPad and it works great in landscape mode. I guess only time will tell. What do you all think?

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• Combine DVCS with Visual Source Safe

  - by WBlasko

  I'm forced to use Visual Source Safe 2005 at work. I'd like to combine that with a DVCS, so that I can check in files locally without disrupting my co-workers if there's a bug or it doesn't compile. In my attempts with Mercurial, it works, but causes a few weird issues. Namely, it thinks someone else has checked out the files I have checked out. Here's my thoughts on how I should manage it: Disable auto-checkout. Work locally in Mercurial When I'm ready to push my changes... Clone my Mercurial repository. Update my Visual Source Safe repository Pull and merge the two repositories using Mercurial. Check everything into Visual Source Safe. Does this sound reasonable? I'm always hearing bad things about VSS, is this just asking for me to see those problems firsthand?

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• Embedding QT application in Eclipse/RCP framework

  - by mots_g

  Hi, I'm trying to embed my working QT application in Eclipse RCP framework(might not sound wise but i need to do this). I'm using QT 4.5 (not yet explored what QTJambi is all about and has to offer) I convert my existing application as a dll and load it through eclipse application. Things dont work as they should as the QTApplication loop sits listening for events, and there is a good mismatch of events. Certain UI objects dont get the events. If I comment my Qppliaction::exec(), then the behaviour in QT app changes. Is there a way to achieve what I'm trying to achieve?? Thanks

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• Flash video player doesn't play after rewriting a url

  - by Joel

  Hi! I recently started a new job working on a content management system. One of the jobs was to implement url rewriting, which i've done, but for some reason the URL rewriting has killed the ability to play flv files through FLVPlayer_Progressive. An example can be seen below: Working if you then follow the link on the menu and go to Campaigns It's a Living Thing you can see how it's not working when the url is being re-written. Below is the html for the object tag i'm setting within a gui editor on the admin side, everything on that end works also! <object height="160" width="284" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" id="FLVPlayer"> <param name="movie" value="/sitefiles/PeachSocial/flash/FLVPlayer_Progressive.swf"> <param name="salign" value="lt"> <param name="quality" value="high"> <param name="scale" value="noscale"> <param name="FlashVars" value="&amp;MM_ComponentVersion=1&amp;skinName=Clear_Skin_1&amp;autoPlay=true&amp;autoRewind=true&amp;streamName=/sitefiles/PeachSocial/flash/dept_envrnmnt"> <embed src="/sitefiles/PeachSocial/flash/FLVPlayer_Progressive.swf" flashvars="&amp;MM_ComponentVersion=1&amp;skinName=Clear_Skin_1&amp;autoPlay=true&amp;autoRewind=true&amp;streamName=/sitefiles/PeachSocial/flash/dept_envrnmnt" quality="high" scale="noscale" name="FLVPlayer" salign="LT" type="application/x-shockwave-flash" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" width="284" height="160"> </object> I would have thought giving the path the way i am would have taken it back to the server root and gone from there, but it doesn't seem to like it once the url rewriting happens. Anyways i'm outta ideas after a pretty frustrating day of trying to pass the thing absolute urls, relative paths and the like and am hoping a fresh set of eyes may help.

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• Is it possible to have AVFramework and AudioToolbox framework in one app?

  - by Satyam

  I'm trying to write develop audio related application. In that, I'm using AudioToolBox framework for recording the sound. And I'm using AVFramework to play soudns. When app is stared, it will play some mp3 file using AVFramework. And also initializes Audiotoolbox. In simulator, I'm able to record and play. But when I'm testing it on iPhone, I'm getting following error for initializing AudioToolBox. 2009-12-11 22:25:51.599 StoryBook[807:207] AudioRecorder init AudioSessionInitialize failed with error: 1768843636 Can some one tell me whether we can use both AV as well as Audio Toolbox frame works in one application? Why I'm getting that error?

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• MPMoviePlayerController - streaming works on 3GS, not on anything pre-3GS

  - by Canada Dev

  I am having some serious issues and annoyances with MPMoviePlayerController. In my app you can watch trailers for some movies in .mov format. I have tested with a friend and had users report that it does not work on their device, which are all 3G. I have tested on my own, a 3GS and playback works fine. I have tried on a 1st gen iPhone and it doesn't work. So I am lead to believe it's a memory issue, and that it's simply stopping the playback and returning to the previous screen. Below is the code I use to launch the player, which is straight out of the MoviePlayer example from Apple. MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:trailerURL]]; if (mp) { self.moviePlayer = mp; [mp release]; [self.moviePlayer play]; } I have tried to check the NSError from the notifications, but the only thing I get is "An unknown playback error occurred" for both the localizedDescription and localizedRecoverySuggestion, making it impossible to figure out exactly why it's not working. I have seen many examples of people who just have issues with the movie player, but it's starting to annoy me that it sometimes seem to work fine and other times it just doesn't (again, appearing like a memory issue). Thanks for any help/feedback provided

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• What does the status code of the Perl interpreter mean?

  - by futureelite7

  Hi, This might sound slightly confusing, but please bear with me. I'm trying to execute a copy of the Perl interpreter using Java's Runtime.exec(). However, it returned error code 9. After running the file a few times, the perl interpreter mysteriously started to return code 253 with no changes in my command at all. What does code 253 / code 9 mean? A google search for perl interpreter's exit codes turned up nothing. Where can I find a list of exit codes for the Perl interpreter? Thanks!

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• grouping draggable objects with jquery-ui draggable

  - by Jim Robert

  Hello, I want to use jquery draggable/droppable to let the user select a group of objects (each one has a checkbox in the corner) and then drag all the selected objects as a group... I can't figure out for the life of me how to do it haha. Here is what I'm thinking will lead to a usable solution, on each draggable object, use the start() event and somehow grab all the other selected objects and add them to the selection I was also considering just making the dragged object look like a group of objects (they're images, so a pile of photos maybe) for performance reasons. I think using the draggable functionality might fall over if you drag several dozen objects at once, does that sound like a better idea?

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• ASP.NET CompositeControl with child controls that contain children

  - by tomfanning

  I am building an ASP.NET server control which extends CompositeControl. I need fine grained control over the rendering, so I override Render() and output the child controls myself, interspersed with HTML generation code: writer.AddStyleAttribute("float", "left"); writer.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Div); writer.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Strong); writer.Write("Table"); writer.RenderEndTag(); // strong writer.WriteBreak(); tableList.RenderControl(writer); writer.RenderEndTag(); // div This works really well for user controls that just contain simple controls without children of their own. However, if I want to use something like a MultiView or an UpdatePanel I run into problems, since I can't override Render() on View or UpdatePanel without extending them, and if I do extend them the implementation would presumably have to depend on FindControl() voodoo to get references to the right controls during render. That doesn't sound like the right way to do this - is there a better way?

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• Changing a Container while using Visitor

  - by Florian

  Hi everyone, I implemented the Visitor pattern in C++ using a STL-like iterator for storing the Visitor's current position in the container. Now I would like to change the container while I iterate over it, and I'm especially interested in deleting items from the container, even the one I'm currently visiting. Now obviously this will invalidate the Visitors internal iterator, because it was pointing to exactly this item. Currently, I store a list of all iterators in the container and update them, as soon as anything is added to or removed from the list. So in a way this is similar to the Observer pattern applied to the iterator (as Observer) and the list (as Observable). Alternatively I considered having the visitor() methods return some hint to the Visitor about what happend to the current item and how to proceed iterating, but that doesn't sound like such a good idea either, because the visit() implementation shouldn't really care about finding the next item. So, my question is: What's the best way to keep a visitor working, even when items are added to the container or removed from it. Regards, Florian

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• StringTokenizer problem of tokenizing

  - by Mr CooL

  String a ="the STRING TOKENIZER CLASS ALLOWS an APPLICATION to BREAK a STRING into TOKENS.  "; StringTokenizer st = new StringTokenizer(a); while (st.hasMoreTokens()){ System.out.println(st.nextToken()); Given above codes, the output is following, the STRING TOKENIZER CLASS ALLOWS an APPLICATION to BREAK a STRING into TOKENS.  My only question is why the "STRING TOKENIZER CLASS" has been combined into one token???????? When I try to run this code, System.out.println("STRING TOKENIZER CLASS".contains(" ")); It printed funny result, FALSE It sound not logical right? I've no idea what went wrong. I found out the reason, the space was not recognized as valid space by Java somehow. But, I don't know how it turned up to be like that from the front processing up to the code that I've posted.

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• Flash AS2.0 and JavaScript/jQuery (ExternalInterface) Communication

  - by abysslogic

  Hi there, Im trying to use JS to send data to my Flash AS2.0 music player with ExternalInterface, except there are no good tutorials or guides on ExternalInterface that I can find. I want to be able to change the current song in the player by clicking a JavaScript link, and on page / window load without clicking, play a default song. I dont need a super complicated answer on loading sounds in flash, etc., I am just having a lot of difficulties getting JS to send anything to Flash, and when I get that to work - would I need to put some if / else into the flash to determine if the link has been clicked or not? Thanks edit heres the code as of now: AS 2.0 import flash.external.ExternalInterface; ExternalInterface.addCallback('loadSong', null, flashFunction); function flashFunction (val) { extra = val; } JavaScript var flashObj = document.getElementById('VSPLAYER'); function loadSong(val) { return val } HTML <a href="javascript:loadSong('2')">Play song 2</a> <object id="VSPLAYER" type="application/x-shockwave-flash" data="vs_player.swf" width="280" height="90"> <param name="movie" value="vs_player.swf" /> <param name="allowscriptaccess" value="always" /> </object>

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• Proper usage (best practices) of Browsable attribute in .NET for runtime grid component behavior

  - by Dan

  I understand how Browsable attribute is supposed to work. It's supposed to hide a property from showing up in a PropertyGrid in design time. It also has another effect in that it will stop a Property from showing up in components such as Grids, or specifically Infragistics WinGrid. I am not sure if it has this behaviour on regular Windows Forms grids. This works, but it doesn't sound like Browsable is being use as intended when being used for 'Run time' displaying of a property on a grid component. Any literature from Microsoft on proper use. Even though it works, I don't want to use this attribute to hide columns on a grid bound to a business object if it's not indeed the correct usage of the attribute, but rather something some grid vendors decided to use to determine property visibility on their grids.

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• AVAudioPlayer via Speakers

  - by Mark

  I got the following code: - (id)init { if (self = [super init]) { UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback; AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory); UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker; AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride); [[AVAudioSession sharedInstance] setDelegate:self]; [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; [[AVAudioSession sharedInstance] setActive:YES error:nil]; } return self; } But somehow the sound does not want to come out of the speakers, can someone see what I am doing wrong? The code I use for playing is: AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:soundFilePathURL error:nil]; [player prepareToPlay]; [player setVolume:1.0]; [player play];

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• C# How to Present Such Question?

  - by ikurtz

  greetings! i have a C# game program that im developing. it uses sound samples and winsock. when i test run the game most of the audio works fine but from time to time if it is multiple samples being played sequentially the application form shakes a little bit and then goes back to its old position. how do i go about debugging this or present it to you folks in a manageable manner? im sure no one is going to want the whole app code in fear of virus attacks. please guide me.. thanking you. EDIT: i have not been able to pin down any code section that produces this result. it just does and i cannot explain it. EDIT: no the x/y position are not changing. the window like shakes around a few pixels and then goes back to the position were it was before the shake.

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• Career Day in kindergarten: how to demonstrate programming in 20 minutes?

  - by Péter Török

  I was invited to the kindergarten group of my elder daughter to talk, and aswer the kids' questions, about my profession. There are 26 kids of age 4-6 in the group (plus 3 teachers who are fairly scared of anything related to programming and IT themselves, but bold enough to learn new tricks). I would have about 20-30 minutes, without projector or anything. (They have an old computer though, which by its look may be a 486, and I am not even sure if it's functioning.) My research turned up excellent earlier threads, with lots of good tips: How would you explain your job to a 5-year old? Career Day: how do I make “computer programmer” sound cool to 8 year olds? What things can I teach a group of children about programming in one day? My situation is different from each of the above though. So any advice on how to teach the kids (and their teachers) in a fun way about programming is appreciated.

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• How do I access data from local XML files in a webOS application on the Palm Pre?

  - by Brijesh Patel

  I am new at Mojo framework and Palm webOS. I want to just retrieve data from XML files using xmlhttprequest (Ajax). I am trying to get data from following script. this.items = []; var that = this; var request = new Ajax.Request("first/movies.xml", { method: 'get', evalJSON: 'false', onSuccess:function(transport){ var movieTags = transport.responseXML.getElementsByTagName('movie'); for( var i = 0; i < movieTags.length; i++ ){ var title = movieTags[i].getAttribute('title'); that.items.push({text: title}); } }, onFailure: function(){ alert('Something went wrong...') } }); My XML files are in the first/movies.xml folder. From that I am trying to access and retrieve data. but not display anything in the screen of Palm Pre emulator. So can anyone is having idea about this issue? Please give a link where can I find the source code for getting data from XML files in webOS.

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• Synonym for "Many-to-Many" relationship (relational databases)

  - by Byron

  What's a synonym for a "many-to-many" relationship? I've finished writing an object-relational mapper but I'm still stumped as to what to name the function that adds that relation. addParent() and addChild() seemed quite logical for the many-to-one/one-to-many and addSuperclass() for one-to-one inheritance, but addManyToMany() would sound quite unintuitive to an object-oriented programmer. addSibling() or addCousin() doesn't really make sense either. Any suggestions? And before you dismiss this as a non-programming question, please remember that consistent naming schemes and encapsulation are pretty integral to programming :)

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