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• NHibernate Session Management Advice

  - by Hugusta

  I need some advice on NHibernate Session Management for a C# WinForms application. I am currently porting an application to use NHibernate. I am also employing a UnitOfWork pattern as described in the link below; http://nhforge.org/wikis/patternsandpractices/nhibernate-and-the-unit-of-work-pattern.aspx My question relates to Sessions. Can you only have one session running per thread at all times? I have a scenario in which a Session (UnitOfWork) may be open for a form shown by the application but the user opens another form (i.e. Tools - Options) which I would like to have its own UnitOfWork. Clearly in this instance it would make more sense to open another Session for the "Tools - Options" form and not use the currently open session for the underlying form. Can we have a Dictionary of Sessions on the one thread? Any advice on session management is appreciated.

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• Create a Generic IEnumerable<T> given a IEnumerable and the member datatypes

  - by ilias

  Hi, I get an IEnumerable which I know is a object array. I also know the datatype of the elements. Now I need to cast this to an IEnumerable<T, where T is a supplied type. For instance IEnumerable results = GetUsers(); IEnumerable<T> users = ConvertToTypedIEnumerable(results, typeof(User)); I now want to cast/ convert this to IEnumerable<User. Also, I want to be able to do this for any type. I cannot use IEnumerable.Cast<, because for that I have to know the type to cast it to at compile time, which I don't have. I get the type and the IEnumerable at runtime. - Thanks

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• How can I force mod_perl to only allow one process per connection?

  - by Charles Ma

  I have a perl cgi script that's fairly resource intensive (takes about 2 seconds to finish). This is fine as long as only at most 4 or 5 of them are running at the same time and that's usually the case. The problem is that when a user clicks a link that calls this script, a new process is spawned to handle that connection request, so if a user clicks many times (if they're impatient), the server gets overloaded with new processes running and most of them are redundant. How can I ensure that only one instance of this process is running per host? This is an old system that I'm maintaining which uses an old framework for the frontend, and I would like to avoid using javascript to disable the button client side if possible. Converting this to fast-cgi perl is out of the question as well, again because this is an old system and adding fast-cgi to apache might break a lot of other things that this thing runs.

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• Is it possible to share a C struct in shared memory between apps compiled with different compilers?

  - by Joseph Garvin

  I realize that in general the C and C++ standards gives compiler writers a lot of latitude. But in particular it guarantees that POD types like C struct members have to be laid out in memory the same order that they're listed in the structs definition, and most compilers provide extensions letting you fix the alignment of members. So if you had a header that defined a struct and manually specified the alignment of its members, then compiled two apps with different compilers using the header, shouldn't one app be able to write an instance of the struct into shared memory and the other app be able to read it without errors? I am assuming though that the size of the types contained is consistent across two compilers on the same architecture (it has to be the same platform already since we're talking about shared memory). I realize that this is not always true for some types (e.g. long vs. long long in GCC and MSVC 64-bit) but nowadays there are uint16_t, uint32_t, etc. types, and float and double are specified by IEEE standards.

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• jquery boxy plugin: prevent multiple instances of the same dialog when clicking the link multiple ti

  - by Lyon

  Hi, I'm using the Boxy jQuery plugin to open dialog windows and populating it through ajax. http://onehackoranother.com/projects/jquery/boxy/ Here's my code so far: $("a.create").click(function (e) { url = $(e.target).attr('href'); Boxy.load(url, {title:'Test'}); }); This opens up a dialog alright. However, if I click the link again, another dialog will open. How can I make it such that the previously opened Boxy dialog will come into focus? I only want one instance of this dialog. I tried assigning a variable to var ele = Boxy.load(); but the variable ele returns undefined... Alas, I can't make out much from the limited Boxy documentation available. Enabling the option modal: true would prevent the user from clicking on the link multiple times, but I don't want the overlay to show. Thanks for any light you can shed on this. -Lyon

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• What can I do with Java for Blu Ray or BD-J?

  - by Jay Askren

  I have a Blu Ray player which can connect to the internet to play media from netflix and youtube. I am intrigued by the possibilities of BD-J and wondering just how far the technology can be taken. For instance: Could I write a twitter, facebook, rss reader, or email client? Can I write a game which would allows people to play each other over the web from their own tv? Could I write a DVR app which stored tv shows on the thumbdrive plugged into the player. Can I run my applications from a thumbdrive or do I need to put them on a Blu Ray disk? Does anyone have real experience with BD-J? How do you like it as a development platform? How would you recommend getting started? Can I develop in BD-J using open source tools like Eclipse, Maven, etc...

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• How can i navigate one xaml page to another?

  - by programmerist

  i have 2 page i need to navigate mainpage.xaml to login.page xaml but it throws me Object reference not set to an instance of an object. in Root.Children.Clear();.... i added this codes in App.xaml: private void Application_Startup(object sender, StartupEventArgs e) { Grid myGrid = new Grid(); myGrid.Children.Add(new MainPage()); this.RootVisual = myGrid; } and than i adde some codes on main.xaml to navigate to LoginUI.xaml namespace Gen.CallCenter.UI { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); Grid Root = ((Grid)(this.Parent)); Root.Children.Clear(); Root.Children.Add(new LoginUI()); } } } How can i navigate main.xaml to LoginUI.xaml ?

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• How to get SpecFlow working with xUnit.net as the test runner

  - by Mike Scott

  I'm trying to use xUnit.net as the test runner for SpecFlow. The SpecFlow 1.2 binaries from the official download area don't contain an xUnit.net provider but the master branch on GitHub has one, so I build SpecFlow.Core.dll from that. I'm using xUnit.net 1.5. However, when I change the unitTestProvider name in the app.config in my spec project, I get a null reference custom tool error and the generated .feature.cs file is the single line: Object reference not set to an instance of an object. Has anyone succeeded in getting SpecFlow to work with xUnit.net? If so, how?

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• How to use Maven2 with Apache Sling?

  - by Jerome Baum

  Google doesn't help, neither does a stackoverflow.com search, and browsing through Apache Sling documentation doesn't show any solution so here goes: How can I best use Maven2 with Apache Sling? Basically as far as I see the entire application code will need to be placed in the JCR repository, but I need it versioned. There is some documentation about OSGi bundles that could contain resources, but isn't it kind of overkill to create a bundle with a bunch of Java code to talk to Sling when all I want to do is load some files to corresponding URLs? What I was hoping for is something like jetty:run that will automatically deploy a WAR into a new Jetty instance. Ideally the goal for Sling would run Sling and then load the specified content -- is there some Maven2 plugin for this right now? Or is the bundle-based solution the "canonical" way of doing this?

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• MediaRecorder prepare() causes segfault

  - by dwilde1

  Folks, I have a situation where my MediaRecorder instance causes a segfault. I'm working with a HTC Hero, Android 1.5+APIs. I've tried all variations, including 3gpp and H.263 and reducing the video resolution to 320x240. What am I missing? The state machine causes 4 MediaPlayer beeps and then turns on the video camera. Here's the pertinent source: UPDATE: ADDING SURFACE CREATE INFO I have rebooted the device based on previous answer to similar question. UPDATE 2: I seem to be following the MediaRecorder state machine perfectly, and if I trap out the MR code, the blank surface displays perfectly and everything else functions perfectly. I can record videos manually and play back via MediaPlayer in my code, so there should be nothing wrong with the underlying code. I've copied sample code on the surface and surfaceHolder code. I've looked at the MR instance in the Debug perspective in Eclipse and see that all (known) variables seem to be instantiated correctly. The setter calls are all now implemented in the exaxct order specced in the state diagram. UPDATE 3: I've tried all permission combinations: CAMERA + RECORD_AUDIO+RECORD_VIDEO, CAMERA only, RECORD_AUDIO+RECORD_VIDEO This is driving me bats! :))) // in activity class definition protected MediaPlayer mPlayer; protected MediaRecorder mRecorder; protected boolean inCapture = false; protected int phaseCapture = 0; protected int durCapturePhase = INF; protected SurfaceView surface; protected SurfaceHolder surfaceHolder; // in onCreate() // panelPreview is an empty LinearLayout surface = new SurfaceView(getApplicationContext()); surfaceHolder = surface.getHolder(); surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); panelPreview.addView(surface); // in timer handler runnable if (mRecorder == null) mRecorder = new MediaRecorder(); mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); mRecorder.setOutputFile(path + "/" + vlip); mRecorder.setVideoSize(320, 240); mRecorder.setVideoFrameRate(15); mRecorder.setPreviewDisplay(surfaceHolder.getSurface()); panelPreview.setVisibility(LinearLayout.VISIBLE); mRecorder.prepare(); mRecorder.start(); Here is a complete log trace for the process run and crash: I/ActivityManager( 80): Start proc com.ejf.convince.jenplus for activity com.ejf.convince.jenplus/.JenPLUS: pid=17738 uid=10075 gids={1006, 3003} I/jdwp (17738): received file descriptor 10 from ADB W/System.err(17738): Can't dispatch DDM chunk 46454154: no handler defined W/System.err(17738): Can't dispatch DDM chunk 4d505251: no handler defined I/WindowManager( 80): Screen status=true, current orientation=-1, SensorEnabled=false I/WindowManager( 80): needSensorRunningLp, mCurrentAppOrientation =-1 I/WindowManager( 80): Enabling listeners W/ActivityThread(17738): Application com.ejf.convince.jenplus is waiting for the debugger on port 8100... I/System.out(17738): Sending WAIT chunk I/dalvikvm(17738): Debugger is active I/AlertDialog( 80): [onCreate] auto launch SIP. I/WindowManager( 80): onOrientationChanged, rotation changed to 0 I/System.out(17738): Debugger has connected I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): waiting for debugger to settle... I/System.out(17738): debugger has settled (1370) I/ActivityManager( 80): Displayed activity com.ejf.convince.jenplus/.JenPLUS: 5186 ms I/OpenCore( 2696): [Hank debug] LN 289 FN CreateNode I/AudioHardwareMSM72XX( 2696): AUDIO_START: start kernel pcm_out driver. W/AudioFlinger( 2696): write blocked for 96 msecs I/PlayerDriver( 2696): CIQ 1625 sendEvent state=5 I/OpenCore( 2696): [Hank debug] LN 289 FN CreateNode I/PlayerDriver( 2696): CIQ 1625 sendEvent state=5 I/OpenCore( 2696): [Hank debug] LN 289 FN CreateNode I/PlayerDriver( 2696): CIQ 1625 sendEvent state=5 I/OpenCore( 2696): [Hank debug] LN 289 FN CreateNode I/PlayerDriver( 2696): CIQ 1625 sendEvent state=5 W/AuthorDriver( 2696): Intended width(640) exceeds the max allowed width(352). Max width is used instead. W/AuthorDriver( 2696): Intended height(480) exceeds the max allowed height(288). Max height is used instead. I/AudioHardwareMSM72XX( 2696): AudioHardware pcm playback is going to standby. I/DEBUG (16094): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** I/DEBUG (16094): Build fingerprint: 'sprint/htc_heroc/heroc/heroc: 1.5/CUPCAKE/85027:user/release-keys' I/DEBUG (16094): pid: 17738, tid: 17738 com.ejf.convince.jenplus Thanks in advance! -- Don Wilde http://www.ConvinceProject.com

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• PropertyGrid: Merging multiple dynamic properties when editing multiple objects

  - by Andrei Stanescu

  Hi, Let's say I have a class A and a class B. I would like to edit using .NET PropertyGrid multiple instances of A and B simultaneously. The desired behavior would be to have the intersection of properties displayed. If A and B have static (written in the source code) properties everything works fine. Selecting A and B instances will only display the intersection of properties. However, if A and B also have dynamic properties (returned as a PropertyDescriptorCollection through the GetProperties() method) the behavior is wrong. When selecting multiple objects I will only see those static properties and none of the dynamic ones. When I select only one instance I can see all properties (static and dynamic). Anybody any ideas? I couldn't find anything on the internet.

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• Javascript: Calling a function written in an anonymous function from String with the function's name

  - by Kai barry yuzanic

  Hello. I've started using jQuery and am wondering how to call functions in an anonymous function dynamically from String. Let's say for instance, I have the following functions: function foo() { // Being in the global namespace, // this function can be called with window['foo']() alert("foo"); } jQuery(document).ready(function(){ function bar() { // How can this function be called // by using a String of the function's name 'bar'?? alert("bar"); } // I want to call the function bar here from String with the name 'bar' } I've been trying to figure out what could be the counterpart of 'window', which can call functions from the global namespace such as window["foo"]. In the small example above, how I can call the function bar from a String "bar"? Thank you for your help.

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• How to access WebMethods in ASP.NET

  - by Quandary

  When i define an AJAX WebMethod like this in an ASPX page (ui.aspx): [System.Web.Services.WebMethod(Description = "Get Import Progress-Report")] [System.Web.Script.Services.ScriptMethod(UseHttpGet = false, ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)] public static string GetProgress() { System.Web.Script.Serialization.JavaScriptSerializer JSONserializer = new System.Web.Script.Serialization.JavaScriptSerializer(); return JSONserializer.Serialize("an Object/Instance here"); } // End WebMethod-Function GetProgress Can I access the description for the corresponding service somewhere ? E.g. when I want to call the webmethod with my own JavaScript, how do I do that ? I investigated the axd files, and found the xmlhttprequest to open ui.aspx/GetProgress But when I type the address in my browser, I get redirected to ui.aspx

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• open_basedir vs sessions

  - by liquorvicar

  On a virtual hosting server I have the open_basedir set to .:/path/to/vhost/web:/tmp:/usr/share/pear for each virtual host. I have a client who's running WordPress and he's complaining about open_basedir errors thus: PHP WARNING: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/var/lib/php/session/sess_42k7jn3vjenj43g3njorrnrmf2) is not within the allowed path(s): (.:/path/to/vhost/web:/tmp:/usr/share/pear) So the PHP session save_path isn't included in open_basedir but sessions across all sites on the server seems to be working fine apart from in this intermittent instance. I thought that perhaps the default session handler ignored open_basedir and this warning was caused by WP accessing the session file directly. However from what I can see PHP 5.2.4 introduced open_basedir checking to the session.save_path config: http://www.php.net/ChangeLog-5.php#5.2.4 (I am on PHP 5.2.13). Any ideas?

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• Binding AutoCompleteBox inside DataTemplate

  - by Thiago

  I have the following AutoCompleteBox defined inside DataTemplate: <Window.Resources> <DataTemplate x:key="PaneTitleTemplate"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition /> </Grid.ColumnDefinition> <ContentPresenter Content="{Binding}" /> <toolkit:AutoCompleteBox x:Name="InsertBox" ItemsSource="{???}" /> </Grid> </DataTemplate> </Window.Resources> ... <radRock:RadPane x:Name="pane1" TitleTemplate="{StaticResource PaneTitleTemplate}"/> Now I'd like to fill it with a list of strings, but I don't know which Binding should I use. The list of strings is an instance variable from the Window. What should I do?

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• WPF MediaPlayer doesn't play M4A?

  - by Nick

  I am trying to use a MediaPlayer instance to play M4A files. For those of you that aren't familiar, MediaPlayer is the non-XAML version of a MediaElement. There are pretty much the same, but I don't want any XAML, so I use a MediaPlayer instead. Anyways, it plays some M4A files just fine. The NaturalDuration of other M4A files is 0, but it still plays. The remaining files don't play at all and the exception thrown is "Media file download failed." Playing all these songs using Windows Media Player works perfectly. Isn't the MediaPlayer and MediaElement classes built upon the same framework as WMP? I'm confused as to why it isn't working. Any help is greatly appreciated. Thanks, Nick

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• Trouble using Loader, can't access properties of loaded swf

  - by anne

  May not have asked question correctly so I’m asking again. I’m using Flash AS3 with code in actions layer. Main movieclip onstage is : design_mc. Within it is a movieclip already in place onstage with an instance name clipart_mc. Now I’m also loading a ListBox to the stage and each time a selection is made from listbox myLoader9 is used to load selected .swf into design_mc.clipArt_mc. Now within each of the .swf files loaded into design_mc.clipArt_mc there is a mc I’d like to color transform called color_mc. So now the listbox is onstage and I make a selection that places heart.swf inside of design_mc.clipArt_mc. I want to access heart.swf so I did this: var child:DisplayObject = myLoader9.content.contentLoaderInfo.content.color_mc; var colorTrans3:ColorTransform = new ColorTransform(); var trans3:Transform = new Transform(child); I still can not get to heart.swf. Can anyone help please? Anne

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• How can I ensure that when I shuffle my puzzle I still end up with an even permutation?

  - by Mithrax

  I'm interested making an implementation of the 14-15 puzzle: I'm creating an array with the values 0 - 15 in increasing order: S = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } Now, what I want to do is shuffle them to create a new instance of the puzzle. However, I know that if I create a board with an "odd permutation" than it is unsolvable. Wikipedia says I need to create the puzzle with an even permutation. I believe this means that I simply have to do ensure I do an even number of swaps? How would I modify Fisher-Yates so I ensure I end up with an even permutation at the end? If I do a swap for every element in the array that would be 16 swaps which I believe would be an even permutation. However, do I need to be concerned about swapping with itself? Is there any other way to ensure I have a valid puzzle?

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• Java JMS = HornetQ = javax.jms.JMSSecurityException: Unable to validate user: null ?

  - by jens

  Hello Experts, I am trying for several hours to get the HornetQ Examples running in Eclipse. Using the Standalone Examples everything works fine, but when I run the examples in Eclipse I get the following error: javax.jms.JMSSecurityException: Unable to validate user: null What could this error mean? Where do I have to specify the user? Maybe HornetQ tries to look this user up in "Some Context/Properties" etc , but I do not know where and how to specifiy the user HornetQ is running under. What i did: 1.)Started Default HornetQ Server with the start.sh Script in the ./bin directory 2.)Copied the QueueExample over to eclpise 3.)Did some minor changes in the config files (to have the same Queue Names...) (I also tried to disable security completely by setting: <security-enabled>false</security-enabled> but with no success, always getting the same error. Also when trying to programmatically instance HornetQ only via classes I get this error too). Thank you very much!! Jens

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• calling WinForms contextmenustrip programmatically

  - by jello

  I programmatically create a Picture Box in c# windows program. I assign it with a value for the Tag property. I would like to print out that tag number programmatically, just for test purposes. so I try this: private void Form1_Load(object sender, EventArgs e) { pic.ContextMenuStrip = contextMenuStrip1; pic.ContextMenuStrip.Click += new EventHandler(this.MyPicHandler); } void MyPicHandler(object sender, EventArgs e) { PictureBox pic = sender as PictureBox; MessageBox.Show(pic.Tag.ToString()); } But when I right-click on the picture, and click on the menu item, it gives me an exception. "A NullReferenceException was unhandled" "Object reference not set to an instance of an object.". anyone's got an idea what's going on?

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• Create many constrained, random permutation of a list

  - by Eyal

  I need to make a random list of permutations. The elements can be anything but assume that they are the integers 0 through x-1. I want to make y lists, each containing z elements. The rules are that no list may contain the same element twice and that over all the lists, the number of times each elements is used is the same (or as close as possible). For instance, if my elements are 0,1,2,3, y is 6, and z is 2, then one possible solution is: 0,3 1,2 3,0 2,1 0,1 2,3 Each row has only unique elements and no element has been used more than 3 times. If y were 7, then 2 elements would be used 4 times, the rest 3.

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• Django - model.save(commit=False - Is there a way to replicate this?

  - by orokusaki

  I'm wanting to do this: from django.contrib.auth.models import User class PetFrog(models.Model): user = models.OnetoOneField(User) color = models.CharField(max_length=20) def clean(self): if self.color == 'Green': user = User(username='prince') user.save(commit=False) # No commit argument in models.Model.save() like there is in ModelForm.save() user.set_password(self.password) user.save() self.user = user Is there a way to do this creation of a model instance without filling in all the required fields, and then setting them manually before trying to save() for real (which would obviously raise a "Must choose a Password" error)? I need to do this in my model, vs using a ModelForm. If there is another way to do it (while still in clean()), I'm completely open to any suggestions.

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• Executing multiple DbCommands in an open connection with Enterprise Library

  - by Lieven Cardoen

  How can you execute multiple DbCommands with one connection? Example: var db = DatabaseFactory.CreateDatabase(); var dbCommand = db.GetSqlStringCommand(InsertCommandText); ... db.ExecuteNonQuery(dbCommand); Now, I want to be able to Execute multiple dbCommands. For instance in pseudo kind of code: var db = DatabaseFactory.CreateDatabase(); var dbCommand1 = db.GetSqlStringCommand(InsertCommandText); ... var dbCommand1 = db.GetSqlStringCommand(InsertCommandText); ... Adding both commands to db Executing them

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• Resizing screenshots/screen captures for inclusion in Beamer

  - by Stephen

  Sorry, this may or may not be a programming question directly, but I am trying to resize screenshots with Imagemagick and Gimp to include in a Beamer presentation, but it comes out even blurrier than the resizing done by LaTeX. For instance, in Beamer I might have a command to rescale the image \includegraphics[width=.5\textwidth]{fig.png}. Using something like \begin{frame} \message{width = \the\textwidth} \message{height = \the\textheight} \end{frame} I have gotten the \textwidth and \textheight parameters in points (345.69548, 261.92444). So I have a script (in Python) that sends a system call to Imagemagick: 'convert %s -resize %.6f@ resized_%s' % (f,a,f) where a is calculated as \textwidth*\textheight*0.5**2. When I then go back into my Beamer presentation and include the resized figure, \includegraphics{resized_fig.png}, the size looks approximately correct but it's super-blurry. I also tried resizing in Gimp (using the GUI) but no luck either... help? Thanks...

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• Can the MVVM-Light ViewModelLocator be used in nested ViewModels?

  - by dthrasher

  The Visual Studio 2008 Designer doesn't seem to like UserControls that reference the MVVM-Light ViewModelLocator. I get an error message like: Could not create an instance of type 'MyUserControl'. For example, the following XAML will cause this behavior if MyUserControl uses the ViewModelLocator to establish its DataContext. <Page x:Class="MyProject.Views.MainView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Views="clr-namespace:MyProject.Views" > <Grid> <Views:MyUserControl/> </Grid> </Page> Is the ViewModelLocator only meant to be used in top-level Views?

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