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• (Android) How are OpenGL ES 1 framebuffers and textures sized?

  - by jens

  I am trying to draw to a texture using a framebuffer using OpenGL ES 1.1 on Android, Java. Afterwords I want to overlay this texture full-screen over my game. In theory, this works like a charm, but somehow the coordinates are off. For testing I drew something at (0,0) with width and height 200, and it partly is off-screen. This is how I create the framebuffer: fb = new int[1]; depthRb = new int[1]; renderTex = new int[1]; gl11ep.glGenFramebuffersOES(1, fb, 0); gl11ep.glGenRenderbuffersOES(1, depthRb, 0); // the depth buffer gl.glGenTextures(1, renderTex, 0);// generate texture gl.glBindTexture(GL10.GL_TEXTURE_2D, renderTex[0]); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT); texBuffer = ByteBuffer.allocateDirect(buf.length*4).order(ByteOrder.nativeOrder()).asIntBuffer(); gl.glTexImage2D(GL10.GL_TEXTURE_2D, 0, GL10.GL_LUMINANCE, texW, texH, 0, GL10.GL_LUMINANCE, GL10.GL_UNSIGNED_BYTE, texBuffer); gl11ep.glBindRenderbufferOES(GL11ExtensionPack.GL_RENDERBUFFER_OES, depthRb[0]); gl11ep.glRenderbufferStorageOES(GL11ExtensionPack.GL_RENDERBUFFER_OES, GL11ExtensionPack.GL_DEPTH_COMPONENT16, texW, texH); Before I draw, I do this: gl11ep.glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, fb[0]); gl.glClearColor(0f, 0f, 0f, 0f); // specify texture as color attachment gl11ep.glFramebufferTexture2DOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, GL11ExtensionPack.GL_COLOR_ATTACHMENT0_OES, GL10.GL_TEXTURE_2D, renderTex[0], 0); // attach render buffer as depth buffer gl11ep.glFramebufferRenderbufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, GL11ExtensionPack.GL_DEPTH_ATTACHMENT_OES, GL11ExtensionPack.GL_RENDERBUFFER_OES, depthRb[0]); I set texW = 1024 and texH = 512. When rendering this texture fullscreen, with a lightmask (size 200x200) placed at (0, 0) and (texW/2, texH/2). You can see that it seems like the coordinate system doesnt start at (0,0) as that light overlaps the screen and the images are not drawn as squares (my lightcone-texture is a circle, not an ellipse). So, how is the coordinate system of this offscreen-drawn texture defined? Thanks

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• Collision detection problem in XNA

  - by Fantasy

  I'm having two problems with my collision detection in XNA. There are two boxes, the red box represents a player and the blue box represents a wall. The first problem is when the player moves to the upper side or bottom side of the wall and collides with it, and then try to go to the left or right, the player will just jump in the opposite direction as seen in the video. However if I go to the right side or the left side of the wall and try to go up or down the player will smoothly go up or down without jumping. The second problem is that when I collide with the box and my key is still pressed down the blue box goes half way through red box and and goes back out and it keeps doing that until I stop pressing the keyboard. its not very clear on the video but the keeps going in and out really fast until I stop pressing the key. Here is a video example:- http://www.youtube.com/watch?v=mKLJsrPviYo and Here is my code Vector2 Position; Rectangle PlayerRectangle, BoxRectangle; float Speed = 0.25f; enum Direction { Up, Right, Down, Left }; Direction direction; protected override void Update(GameTime gameTime) { // Allows the game to exit if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); KeyboardState keyboardState = Keyboard.GetState(); if (keyboardState.IsKeyDown(Keys.Up)) { Position.Y -= (float)(Speed * gameTime.ElapsedGameTime.TotalMilliseconds); direction = Direction.Up; } if (keyboardState.IsKeyDown(Keys.Down)) { Position.Y += (float)(Speed * gameTime.ElapsedGameTime.TotalMilliseconds); direction = Direction.Down; } if (keyboardState.IsKeyDown(Keys.Right)) { Position.X += (float)(Speed * gameTime.ElapsedGameTime.TotalMilliseconds); direction = Direction.Right; } if (keyboardState.IsKeyDown(Keys.Left)) { Position.X -= (float)(Speed * gameTime.ElapsedGameTime.TotalMilliseconds); direction = Direction.Left; } if (PlayerRectangle.Intersects(BoxRectangle)) { if (direction == Direction.Right) Position.X = BoxRectangle.Left - PlayerRectangle.Width; else if (direction == Direction.Left) Position.X = BoxRectangle.Right; if (direction == Direction.Down) Position.Y = BoxRectangle.Top - PlayerRectangle.Height; else if (direction == Direction.Up) Position.Y = BoxRectangle.Bottom; } PlayerRectangle = new Rectangle((int)Position.X, (int)Position.Y, (int)32, (int)32); base.Update(gameTime); }

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• Generate GUID from any string using C#

  - by Haitham Khedre

  Some times you need to generate GUID from a string which is not valid for GUID constructor . so what we will do is to get a valid input from string that the GUID constructor will accept it. It is recommended to be sure that the string that you will generate a GUID from it some how unique. The Idea is simple is to convert the string to 16 byte Array which the GUID constructor will accept it. The code will talk : using System; using System.Text; namespace StringToGUID { class Program { static void Main(string[] args) { int tokenLength = 32; int guidByteSize = 16; string token = "BSNAItOawkSl07t77RKnMjYwYyG4bCt0g8DVDBv5m0"; byte[] b = new UTF8Encoding().GetBytes(token.Substring(token.Length - tokenLength, tokenLength).ToCharArray(), 0, guidByteSize); Guid g = new Guid(b); Console.WriteLine(g.ToString()); token = "BSNePf57YwhzeE9QfOyepPfIPao4UD5UohG_fI-#eda7d"; b = new UTF8Encoding().GetBytes(token.Substring(token.Length - tokenLength, tokenLength).ToCharArray(), 0, guidByteSize); g = new Guid(b); Console.WriteLine(g.ToString()); Console.Read(); } } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }   And The output: 37306c53-3774-5237-4b6e-4d6a59775979 66513945-794f-7065-5066-4950616f3455

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• My Favorite Free Windows Phone Twitter App

  - by Tim Murphy

  Windows Phone 7 has been out for about two years now.  In that time I have switched back and forth with different free Twitter apps.  Mostly the has been because someone has mentioned one or another that they like.  I figured I would give a quick run down of what I felt were the pros and cons of each.  These are only the ones that I have used and your mileage may vary.  So here we go. WP7 Built-In Twitter Functionality While it is great that Microsoft put this functionality in, it is extremely limited in usefulness.  Some apps leverage it to allow you to share pictures or information they contain.  In all though, I don’t use it unless it is the quickest way to get something out. Official Twitter App The official Twitter app isn’t a very big step up from the phone functionality.  It gives you a better timeline view and better attachment handling, but it makes you bounce to a browser page to see images that are linked to a tweet. TweetCaster This was my main Twitter app for quite a while.  It is the only one with InstaPaper integration so that you can save you a tweet and review it later.  My main problem is that it crashes too much when it can’t find a connection.  It also only previews yfrog and twitpic images and only once you go to the detail of a tweet.  Other than that it is a solid Twitter client. moTweets This is my current favorite. It has nice image display in your timeline which I have not seen on any of the other apps.  There are two modes that you can use with this app.  The first is standard to most Twitter apps that allows you to navigate to a tweet and do the usual operations.  The second is what they call Quick Buttons.  In this case you do not see the content of the tweet but go straight to the let’s get something done stage.  It is an interesting take.  I do miss the Instapaper integration and it has a tendency to show a blank timeline list once in a while after you view detail entry.  If you scroll the list it restore your timeline, but you lose you place and are put to the first entry. Seesmic I am not very fond of this app.  The first thing is that it makes you pick a “Space” when you enter the app.  This is really “which account do you want to see”.  On top of that it does not show who retweeted an entry in your timeline and then only tells you how many people RT the post when you look at the detail.  There is a Speak feature that will read you a single tweet, but you have to navigate to the tweet and then to a menu to make it work.  We will have to see if this gets better with the features in Windows Phone 8.  Other than that it is another basic feature app.  Summary In the end I am sticking with moTweets.  I would appreciate it if they added the Instapaper capability and fixed the one bug.  If they did that I would be really happy with the product. del.icio.us Tags: Twitter,Windows Phone 7,WP7,TweetCaster,moTweets,Seesmic

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• XNA 4.0: 2D Camera Y and X are going in wrong direction

  - by Setheron

  I asked this question on stackoverflow but assumed this might be a better area to ask it as well for a more informed answer. My problem is that I am trying to create a camera class and have it so that my camera follows the proper RHS, however the Y axis seems to be inverted since on the screen the 0 starts at the top. Here is my Camera2D Class: class Camera2D { private Vector2 _position; private float _zoom; private float _rotation; private float _cameraSpeed; private Viewport _viewport; private Matrix _viewMatrix; private Matrix _viewMatrixIverse; public static float MinZoom = float.Epsilon; public static float MaxZoom = float.MaxValue; public Camera2D(Viewport viewport) { _viewMatrix = Matrix.Identity; _viewport = viewport; _cameraSpeed = 4.0f; _zoom = 1.0f; _rotation = 0.0f; _position = Vector2.Zero; } public void Move(Vector2 amount) { _position += amount; } public void Zoom(float amount) { _zoom += amount; _zoom = MathHelper.Clamp(_zoom, MaxZoom, MinZoom); UpdateViewTransform(); } public Vector2 Position { get { return _position; } set { _position = value; UpdateViewTransform(); } } public Matrix ViewMatrix { get { return _viewMatrix; } } private void UpdateViewTransform() { Matrix proj = Matrix.CreateTranslation(new Vector3(_viewport.Width * 0.5f, _viewport.Height * 0.5f, 0)) * Matrix.CreateScale(new Vector3(1f, 1f, 1f)); _viewMatrix = Matrix.CreateRotationZ(_rotation) * Matrix.CreateScale(new Vector3(_zoom, _zoom, 1.0f)) * Matrix.CreateTranslation(_position.X, _position.Y, 0.0f); _viewMatrix = proj * _viewMatrix; } } I test it using SpriteBatch in the following way: protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Vector2 position = new Vector2(0, 0); // TODO: Add your drawing code here spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend, null, null, null, null, camera.ViewMatrix); Texture2D circle = CreateCircle(100); spriteBatch.Draw(circle, position, Color.Red); spriteBatch.End(); base.Draw(gameTime); }

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• How can I add a character and enemies to a game that uses Parallax Scrolling? [on hold]

  - by Homer_Simpson

  I use the following code to create Parallax Scrolling: http://www.david-gouveia.com/portfolio/2d-camera-with-parallax-scrolling-in-xna/ Parallax Scrolling is working but I don't know how to add the player and the enemies. I tried to add a player class to the existing code, but if the player moves, then the camera isn't pointing at the player. The player leaves the camera viewport after a few seconds. I use the following code(as described in the tutorial), but it's not working: // Updates my camera to lock on the character _camera.LookAt(player.Playerposition); What can I do so that the player is always the center of the camera? How should I add the character and the enemies to the game? Should I create a layer for the character and the enemies? For example: new Layer(_camera) { Parallax = new Vector2(0.9f, 1.0f) } At the moment, I don't use a layer for the player and I don't have implemented the enemies because I don't know how to do that. My player class: public class Player { Texture2D Playertex; public Vector2 Playerposition = new Vector2(400, 240); private Game1 game1; public Player(Game1 game) { game1 = game; } public void Load(ContentManager content) { Playertex = content.Load<Texture2D>("8bitmario"); TouchPanel.EnabledGestures = GestureType.HorizontalDrag; } public void Update(GameTime gameTime) { while (TouchPanel.IsGestureAvailable) { GestureSample gs = TouchPanel.ReadGesture(); switch (gs.GestureType) { case GestureType.HorizontalDrag: Playerposition.X += 3f; break; } } } public void Render(SpriteBatch batch) { batch.Draw(Playertex, new Vector2(Playerposition.X - Playertex.Width / 2, Playerposition.Y - Playertex.Height / 2), Color.White); } } In Game1, I update the player and camera class: protected override void Update(GameTime gameTime) { // Updates my character's position player.Update(gameTime); // Updates my camera to lock on the character _camera.LookAt(player.Playerposition); base.Update(gameTime); } protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); foreach (Layer layer in _layers) layer.Draw(spriteBatch); spriteBatch.Begin(SpriteSortMode.Deferred, null, null, null, null, null, _camera.GetViewMatrix(new Vector2(0.0f, 0.0f))); player.Render(spriteBatch); spriteBatch.End(); base.Draw(gameTime); }

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• Mocking HttpContext in .NET MVC2 using Moq

  - by Richard

  Hi, This was working in MVC 1, but has broken in MVC 2. I'm mocking the HttpContext so I can test routes. The code was originally taken from Steven Sanderson's book. I've tried mocking some extra properties as suggested in this comment but it hasn't fixed it. What am I missing? This is the start of my test code. routeData is null when this code completes. // Arange RouteCollection routeConfig = new RouteCollection(); MvcApplication.RegisterRoutes(routeConfig); var mockHttpContext = makeMockHttpContext(url); // Act RouteData routeData = routeConfig.GetRouteData(mockHttpContext.Object); This method creates my mock HttpContext: private static Mock<HttpContextBase> makeMockHttpContext(String url) { var mockHttpContext = new Mock<System.Web.HttpContextBase>(); // Mock the request var mockRequest = new Mock<HttpRequestBase>(); mockHttpContext.Setup(t => t.Request).Returns(mockRequest.Object); mockRequest.Setup(t => t.AppRelativeCurrentExecutionFilePath).Returns(url); // Tried adding these to fix in MVC2 (didn't work) mockRequest.Setup(r => r.HttpMethod).Returns("GET"); mockRequest.Setup(r => r.Headers).Returns(new NameValueCollection()); mockRequest.Setup(r => r.Form).Returns(new NameValueCollection()); mockRequest.Setup(r => r.QueryString).Returns(new NameValueCollection()); mockRequest.Setup(r => r.Files).Returns(new Mock<HttpFileCollectionBase>().Object); // Mock the response var mockResponse = new Mock<HttpResponseBase>(); mockHttpContext.Setup(t => t.Response).Returns(mockResponse.Object); mockResponse.Setup(t => t.ApplyAppPathModifier(It.IsAny<String>())).Returns<String>(t => t); return mockHttpContext; }

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• Mixing AJAX requests with Flash scope objects not working

  - by AlanObject

  I have a JSF page that displays a table from an object called TableQuery that supports stateful pagination, sorting, etc. The bean that accesses the object is a RequestScoped object, and it attempts to preserve the TableQuery by storing it the flash map. The accessor method looks like this: public TableQuery<SysLog> getQuery() { if (query != null) return query; Flash flash = FacesContext.getCurrentInstance(). getExternalContext().getFlash(); query = (TableQuery) flash.get("Query"); if (query != null) System.out.println("TableSysLog.getQuery() Got query from flash!"); if (query == null) { query = slc.getNewTableQuery(); System.out.println("TableSysLog.getQuery() Created new query"); } flash.put("Query", query); return query; } The Links to go between pages are implemented with *p:commandLInk*s. I use Primefaces command link in AJAX mode so just the link gets processed when it is clicked. The action listener looks like this: public void doNextPage(ActionEvent evt) { getQuery().doNextPage(); } When it doesn't work I get the error message: WARNING: JSF1095: The response was already committed by the time we tried to set the outgoing cookie for the flash. Any values stored to the flash will not be available on the next request. I found this thread when looking up this problem. When I turned of HTTP chunking as the article suggests, the error message went away but the problem remained. Does anyone know what is going on and how this might be fixed?

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• Spring Security RememberMe Services with Session Cookie

  - by Jarrod

  I am using Spring Security's RememberMe Services to keep a user authenticated. I would like to find a simple way to have the RememberMe cookie set as a session cookie rather than with a fixed expiration time. For my application, the cookie should persist until the user closes the browser. Any suggestions on how to best implement this? Any concerns on this being a potential security problem? The primary reason for doing so is that with a cookie-based token, any of the servers behind our load balancer can service a protected request without relying on the user's Authentication to be stored in an HttpSession. In fact, I have explicitly told Spring Security to never create sessions using the namespace. Further, we are using Amazon's Elastic Load Balancing, and so sticky sessions are not supported. NB: Although I am aware that as of Apr. 08, Amazon now supports sticky sessions, I still do not want to use them for a handful of other reasons. Namely that the untimely demise of one server would still cause the loss of sessions for all users associated with it. http://aws.amazon.com/about-aws/whats-new/2010/04/08/support-for-session-stickiness-in-elastic-load-balancing/

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• Why can't I resolve ambiguity with Android.OS.Environment?

  - by C. Lang

  I'm trying to use Environment.(...) in my Xamarin app. It complains that "Environment is an ambiguous reference between System.Environment and Android.OS.Environment" I can fix it by using the fully qualified name System.Environment.(...) but not with Android.OS.Environment.(...). For example: // Obviously ambiguous with error above using System; using Android.OS; // ... // OnCreate uses Bundle also in Android.OS //... string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal); // Can be fixed by prefixing Environment with "System." But I can't fix it with any variation of possibilities using Android.OS including removing it and explicitly using it. The auto-complete box only shows the Activities and "Resource" and not any of the classes. // Solution to be able to use Android's Environment using Android.OS; // same as above Java.IO.File storageDir = Environment.ExternalStorageDirectory; // Defaults to Android.OS but can still use "System.Environment.(...) // Of course not with this example, but with the one above; yes. // Why doesn't it work both ways? If I remove the using statement and // try to use Android.OS.Environment.(...) it complains // 'OS type or namespace doesn't not exist' The reason is prefixing with Android. is referring to MyAppName.App.Android. Why is that and is there a way to directly access Android.OS.(...)? I've tried Mono.Android.OS.(...).

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• PDF rendering crashes app Core Graphics

  - by Felixyz

  EDIT: The memory leaks turned out to be unrelated to the crashes. Leaks are fixed but crashes remain, still mysterious. My (iPhone) app does lots of PDF loading and rendering, some of it threaded. Sometime, it seems always after I flush a page cash after getting a memory warning, the app crashes with a bad access when trying to draw a pdf page stored in an NSData object. Here is one example trace: #0 0x3016d564 in CGPDFResourcesGetResource () #1 0x3016d58a in CGPDFResourcesGetResource () #2 0x3016d94e in CGPDFResourcesGetExtGState () #3 0x3015fac4 in CGPDFContentStreamGetExtGState () #4 0x301629a8 in op_gs () #5 0x3016df12 in handle_xname () #6 0x3016dd9e in read_objects () #7 0x3016de6c in CGPDFScannerScan () #8 0x30161e34 in CGPDFDrawingContextDraw () #9 0x3016a9dc in CGContextDrawPDFPage () But sometimes I get this instead: Program received signal: “EXC_BAD_ACCESS”. (gdb) bt #0 0x335625fa in objc_msgSend () #1 0x32c04eba in CFDictionaryGetValue () #2 0x3016d500 in get_value () #3 0x3016d5d6 in CGPDFResourcesGetFont () #4 0x3015fbb4 in CGPDFContentStreamGetFont () #5 0x30163480 in op_Tf () #6 0x3016df12 in handle_xname () #7 0x3016dd9e in read_objects () #8 0x3016de6c in CGPDFScannerScan () #9 0x30161e34 in CGPDFDrawingContextDraw () #10 0x3016a9dc in CGContextDrawPDFPage () Is this an indication that I've mistakenly deallocated an object? It's hard for me to decode what's happening here. This is how I create and retain the various objects involved: // Some data was just loaded from the network and is pointed to by "data" self.pdfData = data; _dataProviderRef = CGDataProviderCreateWithData( NULL, [_pdfData bytes], [_pdfData length], NULL ); _documentRef = CGPDFDocumentCreateWithProvider(_dataProviderRef); _pageRef = CGPDFDocumentGetPage(_documentRef, 1); CGPDFPageRetain(_pageRef); _pdfFrame = CGPDFPageGetBoxRect(_pageRef, kCGPDFArtBox); So the NSData object is retained, and I explicitly retain the page reference. The data provider and the document are already retained by the create-functions. And here is my dealloc method: -(void)dealloc { if (_pageRef) CGPDFPageRelease(_pageRef); if (_documentRef) CGPDFDocumentRelease(_documentRef); if (_dataProviderRef) CGDataProviderRelease(_dataProviderRef); self.pdfData = nil; [super dealloc]; } Am I doing anything wrong? Even an assurance that I'm not, with explanation, would be a help.

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• Managing Dependency Hell with WiX and C#

  - by Tom the Junglist

  We are on the eve of product launch, and at the last minute I am being bombarded with crash reports that appear to be related to our installer, which is a WiX3 project with separate outputs for x86 and x64 builds. These have been an ongoing problem that I always thought were fixed, only to find out that they were still lurking. The product itself is a collection of binaries that communicate with each other via .Net remoting, including a Windows Service and a small COM component that is loaded as an addon in another app. The service runs as SYSTEM, the COM piece runs in a low-rights context, while the other pieces run in normal user contexts. Other pieces include an third-party COM object library DLL and a shared DLL with the .net Remoting interfaces. I've observed flat-out weird behavior with MSI, particularly on version upgrades. Between MS' anal strong-name implementation (specifically, the exact version check before loading a given assembly), a documented WiX/MSI bug that sees critical files erased on upgrades (essentially, if a file in the upgrade MSI has the same version number as the existing install, that file is deleted), and having to work around Wow64 virtualization (x86 MSI can only write to registry/HD locations via Wow64, yet x64 MSIs cannot run on x86 computers...), I am about ready to trash the whole thing and port it over to a different install system. What I am looking for on tips + tricks, techniques, or suggestions on how to properly do things so that I am not fighting with Windows Installer's twisted sense of logic. I am tired of fighting with WiX/MSI/Windows Installer. All it needs to do is place files and registry keys where I tell it to, upgrade them when appropriate, and don't delete anything until the user uninstalls. Instead, dependencies are deleted willy-nilly, bringing up a whole bunch of uncatchable exceptions (can't wrap a try{} block around function declarations) and GPF'ing the whole app. I am particularly interested in 'best practices' and examples regarding shared and dependency DLLs, and any tips on making sure if a file needs to go to GAC, that it actually goes to the GAC and stays there until it is appropriate to remove it. Thanks! Tom

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• Binding TabControl ItemsSource to an ObservableCollection of ViewModels causes content to refresh on

  - by Brent

  I'm creating an WPF application using the MVVM framework, and I've adopted several features from Josh Smith's article on MVVM here... Most importantly, I'm binding a TabControl to an ObservableCollection of ViewModels. This means that am using a tabbed MDI interface that displays a UserControl as the content of a TabItem. The issue I'm seeing in my application is that when I have several tabs and I flip back and forth between tabs, the content is being refersh each time I change tabs. If you download Josh Smith's source code, you'll see that his app has the same problem. For example, click on the "View All Customers" button and scroll down to the bottom the ListView. Next click on the "Create New Customer" button. When you switch back to the All Customer view you'll notice that the ListView scrolls back to the top. If you switch back to the New Customer tab and place your cursor in one of the TextBoxes, then switch to All Customers tab and back, you'll notice that the cursor is now gone. I imagine that this is because I'm using an ObservableCollection, but I can't be sure. Is there any way to prevent the tab's content from refreshing when it receives the focus? EDIT: I found my problem when I ran the profiler on my application. I'm defining a DataTemplate for my ViewModels so it knows how to render the ViewModel when it is displayed in the tab... like so: <DataTemplate DataType="{x:Type vm:CustomerViewModel}"> <vw:CustomerView/> </DataTemplate> So whenever I switch to a different tab, it has to re-create the ViewModel again. I fixed it temporarily by changing my ObservableCollection of ViewModels to an ObservableCollection of UserControls. However, I would really still like to use DataTemplates if possible. Is there a way to make a DataTemplate work?

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• How to get only one rounded corner with border-radius htc hack and MSIE v:roundrect?

  - by aarreoskari

  I have a problem with partially rounded corners. See the first working example for most browsers: .box { display: block; width: 100px; height: 100px; border: 1px solid black; background-color: yellow; -moz-border-radius-bottomright: 10px; -webkit-border-bottom-right-radius: 10px; } You can see that only bottom right corner should be rounded. Natural choice would be adding a border-radius.htc hack inside a conditional IE statement: .box { border-bottom-right-radius: 20px; behavior:url(border-radius.htc); } This is not working because border-radius.htc file is only accessing normal border-radius value (this.currentStyle['border-radius']). VML used by the hack is roundrect which only supports one percentage value for arcsize. So I was wondering if there is any other way around the problem by using some other VML elements? Another problem is that htc-file doesnt's support borders but that can be fixed with VML's stroked attribute. Nifty corners for example doesn't work well with corners at all.

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• How to create a dynamic Linq Join extension method

  - by Royd Brayshay

  There was a library of dynamic Linq extensions methods released as a sample with VS2008. I'd like to extend it with a Join method. The code below fails with a parameter miss match exception at run time. Can anyone find the problem? public static IQueryable Join(this IQueryable outer, IEnumerable inner, string outerSelector, string innerSelector, string resultsSelector, params object[] values) { if (inner == null) throw new ArgumentNullException("inner"); if (outerSelector == null) throw new ArgumentNullException("outerSelector"); if (innerSelector == null) throw new ArgumentNullException("innerSelector"); if (resultsSelector == null) throw new ArgumentNullException("resultsSelctor"); LambdaExpression outerSelectorLambda = DynamicExpression.ParseLambda(outer.ElementType, null, outerSelector, values); LambdaExpression innerSelectorLambda = DynamicExpression.ParseLambda(inner.AsQueryable().ElementType, null, innerSelector, values); ParameterExpression[] parameters = new ParameterExpression[] { Expression.Parameter(outer.ElementType, "outer"), Expression.Parameter(inner.AsQueryable().ElementType, "inner") }; LambdaExpression resultsSelectorLambda = DynamicExpression.ParseLambda(parameters, null, resultsSelector, values); return outer.Provider.CreateQuery( Expression.Call( typeof(Queryable), "Join", new Type[] { outer.ElementType, inner.AsQueryable().ElementType, outerSelectorLambda.Body.Type, innerSelectorLambda.Body.Type, resultsSelectorLambda.Body.Type }, outer.Expression, inner.AsQueryable().Expression, Expression.Quote(outerSelectorLambda), Expression.Quote(innerSelectorLambda), Expression.Quote(resultsSelectorLambda))); } I've now fixed it myself, here's the answer. Please vote it up or add a better one.

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• Decoding ima4 audio format

  - by MrDatabase

  To reduce the download size of an iPhone application I'm compressing some audio files. Specifically I'm using afconvert on the command line to change .wav format to .caf format w/ ima4 compression. I've read this (wooji-juice.com) awesome post about this exact topic. I'm having trouble w/ the "decoding ima4 packets" step. I've looked at their sample code and I'm stuck. Please help w/ some pseudo code or sample code that can guide me in the right direction. Thanks! Additional info: Here is what I've completed and where I'm having trouble... I can play .wav files in both the simulator and on the phone. I can compress .wav files to .caf w/ ima4 compression using afconvert on the command line. I'm using the SoundEngine that came w/ CrashLanding (I fixed one memory leak). I modified the SoundEngine code to look for the mFormatID 'ima4'. I don't understand the blog post linked above starting w/ "Calculating the size of the unpacked data". Why do I need to do this? Also, what does the term "packet" refer to? I'm very new to any sort of audio programming.

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• jQuery urlencode/decode patch help

  - by jeerose

  Hi Gang, I'm using this jQuery urlencode and urldecode plugin - very simple and easy to use but it doesn't, in its original form, remove + from the string. The one comment on the home page suggests a patch but I don't know how to implement it. Can anyone help me out? The Page: http://www.digitalbart.com/jquery-and-urlencode/ //URL Encode/Decode $.extend({URLEncode:function(c){var o='';var x=0;c=c.toString(); var r=/(^[a-zA-Z0-9_.]*)/; while(x<c.length){var m=r.exec(c.substr(x)); if(m!=null && m.length>1 && m[1]!=''){o+=m[1];x+=m[1].length; }else{if(c[x]==' ')o+='+';else{var d=c.charCodeAt(x);var h=d.toString(16); o+='%'+(h.length<2?'0':'')+h.toUpperCase();}x++;}}return o;}, URLDecode:function(s){var o=s;var binVal,t;var r=/(%[^%]{2})/; while((m=r.exec(o))!=null && m.length>1 && m[1]!=''){ b=parseInt(m[1].substr(1),16); t=String.fromCharCode(b);o=o.replace(m[1],t);}return o;} }); The proposed Patch: function dummy_url_decode(url) { // fixed -- + char decodes to space char var o = url; var binVal, t, b; var r = /(%[^%]{2}|\+)/; while ((m = r.exec(o)) != null && m.length > 1 && m[1] != '') { if (m[1] == '+') { t = ' '; } else { b = parseInt(m[1].substr(1), 16); t = String.fromCharCode(b); } o = o.replace(m[1], t); } return o; } Thanks!

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• UISearchBar in a UITableView

  - by petert

  I'm trying to mimic the behaviour of a table view like one in the iPod app for Artists - it's a sectioned table view with a section index on the right and with a search bar at the top, but initially hidden when view shown. I am using sdk 3.1.2 and IB, so simply dragged a UISearchDisplayController in to my NIB - it does wire everything up ready for searching. The problem starts because I'm adding the UISearchBar in to the first section of the UITableView, because if I understand correctly I must do this so I can jump to the search bar by touching the search icon in the section index directly? When the table view appears I see the search bar but it has resized and I now have a white block behind the section index at the top. It does'nt take the color of the UISearchBar's surround which interestingly is different to that shown in Interface Builder. Searching around, I did find a tip to add a small navigation bar and a UISearchBar in a UIView, then add this to the table view cell - this works.. BUT the color of the navigation bar's background is what you'd expect normally (gray), not the different color as noted above?! More interesting, if I click the search bar to start a search, then click Cancel, all is fixed!!! The background along the whole tableview cell when the search bar is, is the same!!?! Thanks for any tips.

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• IEnumerable<T> and reflection

  - by Aren B

  Background Working in .NET 2.0 Here, reflecting lists in general. I was originally using t.IsAssignableFrom(typeof(IEnumerable)) to detect if a Property I was traversing supported the IEnumerable Interface. (And thus I could cast the object to it safely) However this code was not evaluating to True when the object is a BindingList<T>. Next I tried to use t.IsSubclassOf(typeof(IEnumerable)) and didn't have any luck either. Code /// <summary> /// Reflects an enumerable (not a list, bad name should be fixed later maybe?) /// </summary> /// <param name="o">The Object the property resides on.</param> /// <param name="p">The Property We're reflecting on</param> /// <param name="rla">The Attribute tagged to this property</param> public void ReflectList(object o, PropertyInfo p, ReflectedListAttribute rla) { Type t = p.PropertyType; //if (t.IsAssignableFrom(typeof(IEnumerable))) if (t.IsSubclassOf(typeof(IEnumerable))) { IEnumerable e = p.GetValue(o, null) as IEnumerable; int count = 0; if (e != null) { foreach (object lo in e) { if (count >= rla.MaxRows) break; ReflectObject(lo, count); count++; } } } } The Intent I want to basically tag lists i want to reflect through with the ReflectedListAttribute and call this function on the properties that has it. (Already Working) Once inside this function, given the object the property resides on, and the PropertyInfo related, get the value of the property, cast it to an IEnumerable (assuming it's possible) and then iterate through each child and call ReflectObject(...) on the child with the count variable.

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• "You do not have permissions to do this operation. Ask your website administrator to change your pem

  - by user288728

  I need some help regarding the above title. After applying SP1 pack on our SharePoint Server 2007 (MOSS 3.0) the workflows aren't working anymmore on one of the WebApplications (located in SSP2) Workflows work, however on other existing applications (on SSP1 or SSP2) or newly created applications (on SSP1 or SSP2). Details of error: 1. Default / Built in SharePoint Workflows are not starting 2. Sharepoint Designer Workflows throwing the following error message: "You do not have permissions to do this operation. Ask your website administrator to change your pemissions and then try again, or log on with another account that has this permission. To log on with another user account click ok. " 3. Before applying the SP1 on MOSS the workflows were working perfectly fine on this WebApplication. so far: 1. I am logged in as Administrator (bot on Sharepoint site or when working with Sharepoint Designer). 2. Administrator is included in the list Site Collection Administrators 3. I noticed in Sharepoint designer that the username used for creating the workflow is 'converted' into SHAREPOINT\system (in the Modified By Column). Has anybody come accross/fixed this error? Any help much appreciated. Thanks D

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• Is HttpContextWrapper all that....useful?

  - by bakasan

  I've been going through the process of cleaning up our controller code to make each action as testable. Generally speaking, this hasn't been too difficult--where we have opportunity to use a fixed object, like say FormsAuthentication, we generally introduce some form of wrapper as appropriate and be on our merry way. For reasons not particularly germaine to this conversation, when it came to dealing with usage of HttpContext, we decided to use the newly created HttpContextWrapper class rather than inventing something homegrown. One thing we did introduce was the ability to swap in a HttpContextWrapper (like say, for unit testing). This was wholly inspired by the way Oren Eini handles unit testing with DateTimes (see article, a pattern we also use) public static class FooHttpContext { public static Func<HttpContextWrapper> Current = () => new HttpContextWrapper(HttpContext.Current); public static void Reset() { Current = () => new HttpContextWrapper(HttpContext.Current); } } Nothing particularly fancy. And it works just fine in our controller code. The kicker came when we go to write unit tests. We're using Moq as our mocking framework, but alas var context = new Mock<HttpContextWrapper>() breaks since HttpContextWrapper doesn't have a parameterless ctor. And what does it take as a ctor parameter? A HttpContext object. So I find myself in a catch 22. I'm using the prescribed way to decouple HttpContext--but I can't mock a value in because the original HttpContext object was sealed and therefore difficult to test. I can map HttpContextBase, which both derive from--but that doesn't really get me what I'm after. Am I just missing the point somewhere with regard to HttpContextWrapper? I can find ways to work around the issue, but we are kind of fond of remaining consistent in decoupling using the Function delegate pattern--but it seems like we're not fully grokking intent of the wrapper.

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• Android custom media controller using vidtry

  - by Mathias Lin

  I want to use a custom media controller in my Android app and therefore looking at the vidtry code (http://github.com/commonsguy/vidtry), especially Player.java: The sample works fine as it comes. But I want the sample to play the fixed video automatically on app startup (so I don't want to enter a URL). I added: @Override public void onStart() { super.onStart(); address.setText("/sdcard/mydata/category/1/video_agkkr6me.mp4"); go.setEnabled(true); onGo.onClick(go); } Strange thing here is that if I run the app, the audio of the video plays but the image doesn't show. Everything else works fine (progress bar, etc.). I can't figure out the difference between the manual click on the go-button and the programmatic one. I looked at the code and didn't see any difference that might occur between manual and programmatic click. I checked if any elements (esp. surface) might be hidden, but it's not. I even tried a surface.setVisibility(View.INVISIBLE); surface.setVisibility(View.VISIBLE); in case some issue with the redrawing, but no difference. The video image does show when I manually hit the go button, but just not on start up automatically.

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• Code Golf: Collatz Conjecture

  - by Earlz

  Inspired by http://xkcd.com/710/ here is a code golf for it. The Challenge Given a positive integer greater than 0, print out the hailstone sequence for that number. The Hailstone Sequence See Wikipedia for more detail.. If the number is even, divide it by two. If the number is odd, triple it and add one. Repeat this with the number produced until it reaches 1. (if it continues after 1, it will go in an infinite loop of 1 -> 4 -> 2 -> 1...) Sometimes code is the best way to explain, so here is some from Wikipedia function collatz(n) show n if n > 1 if n is odd call collatz(3n + 1) else call collatz(n / 2) This code works, but I am adding on an extra challenge. The program must not be vulnerable to stack overflows. So it must either use iteration or tail recursion. Also, bonus points for if it can calculate big numbers and the language does not already have it implemented. (or if you reimplement big number support using fixed-length integers) Test case Number: 21 Results: 21 -> 64 -> 32 -> 16 -> 8 -> 4 -> 2 -> 1 Number: 3 Results: 3 -> 10 -> 5 -> 16 -> 8 -> 4 -> 2 -> 1 Also, the code golf must include full user input and output.

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• __doPostBack is not working in firefox

  - by Dan Williams

  The __doPostBack is not working in firefox 3 (have not checked 2). Everything is working great in IE 6&7 and it even works in Chrome?? It's a simple asp:LinkButton with an OnClick event <asp:LinkButton ID="DeleteAllPicturesLinkButton" Enabled="False" OnClientClick="javascript:return confirm('Are you sure you want to delete all pictures? \n This action cannot be undone.');" OnClick="DeletePictureLinkButton_Click" CommandName="DeleteAll" CssClass="button" runat="server"> The javascript confirm is firing so I know the javascript is working, it's specirically the __doPostBack event. There is a lot more going on on the page, just didn't know if it's work it to post the entire page. I enable the control on the page load event. Any ideas? I hope this is the correct way to do this, but I found the answer. I figured I'd put it up here rather then in a stackoverflow "answer" Seems it had something to do with nesting ajax toolkit UpdatePanel. When I removed the top level panel it was fixed. Hope this helps if anyone else has the same problem. I still don't know what specifically was causing the problem, but that was the solution for me.

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• Max Value of a Multiway Tree in OCaml

  - by Trigork

  I'm an IT Student and kind of a newbie to OCaml Recently, studying for an exam I found this exercise. Given: type 'a tree = Tree of 'a * 'a tree list Define a function mtree : 'a tree -'a, that returns the greatest value of all the nodes in a multiway tree, following the usual order relation in OCaml (<=) I've come to do something like this below, which, of course, is not working. let rec mtree (Tree (r, sub)) = let max_node (Tree(a, l1)) (Tree(b, l2)) = if a >= b then (Tree(a, l1)) else (Tree(b, l2)) in List.fold_left max_node r sub;; After reading an answer to this I'm posting the fixed code. let rec mtree (Tree(r,sub)) = let max_node (Tree(a, l1)) (Tree(b, l2)) = if a >= b then a else b in List.fold_left (max_node) r (List.map mtree sub);; The idea is the same, fold the list comparing the nodes making use of my local function to do so and travel through the tree by calling the function itself over the nodes lists of the consecutive levels. Is still not working, though. Now complains about max_node in the fold_left part. Error: This expression has type 'a tree -> 'a tree -> 'a but an expression was expected of type 'a tree -> 'a tree -> 'a tree And here I'm definitely lost because I can't see why does it expects to return an 'a tree

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