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  • How do you call a generic method on a thread?

    - by cw
    How would I call a method with the below header on a thread? public void ReadObjectAsync<T>(string filename) { // Can't use T in a delegate, moved it to a parameter. ThreadStart ts = delegate() { ReadObjectAcync(filename, typeof(T)); }; Thread th = new Thread(ts); th.IsBackground = true; th.Start(); } private void ReadObjectAcync(string filename, Type t) { // HOW? } public T ReadObject<T>(string filename) { // Deserializes a file to a type. }

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  • C# LINQ Where Predicate Type Arguments

    - by blu
    I have an XElement with values for mock data. I have an expression to query the xml: Expression<Func<XElement, bool>> simpleXmlFunction = b => int.Parse(b.Element("FooId").Value) == 12; used in: var simpleXml = xml.Elements("Foo").Where(simpleXmlFunction).First(); The design time error is: The type arguments for method 'System.Linq.Enumerable.Where(System.Collections.Generic.IEnumerable, System.Func)' cannot be inferred from the usage. Try specifying the type arguments explicitly' The delegate supplied to Where should take in an XElement and return a bool, marking if the item matches the query, I am not sure how to add anything more to the delegate or the where clause to mark the type. Also, the parallel method for the real function against the Entity Framework does not have this issue. What is not correct with the LINQ-to-XML version?

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  • Regarding xml parsing in iphone

    - by Prash.......
    hi... I am developing an applictaion in which i am doing xml parsing i found an error in [xmlparse parse] method. and the error for this is as follows: [NSCFString bytes]: unrecognized selector sent to instance 0x3df6310 2010-04-30 00:09:46.302 SPCiphone2[4234:1003] void SendDelegateMessage(NSInvocation*): delegate () failed to return after waiting 10 seconds. main run loop mode: kCFRunLoopDefaultMode code snippet for this as follows. responseOfWebResultData = [[NSMutableString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; NSLog(@"result: %@", responseOfWebResultData); //starting the XML parsing if(responseOfWebResultData) { @try { xmlParser = [[NSXMLParser alloc] initWithData:responseOfWebResultData]; [xmlParser setDelegate: self]; [xmlParser setShouldResolveExternalEntities: YES]; [xmlParser parse]; [responseOfWebResultData release]; } @catch(NSException *e) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Please " message:[e reason] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; [alert release]; } }

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  • WPF Dispatcher {"The calling thread cannot access this object because a different thread owns it."}

    - by user359446
    first I need to say that I´m noob with WPF and C#. Application: Create Mandelbrot Image (GUI) My disptacher works perfektly this this case: private void progressBarRefresh(){ while ((con.Progress) < 99) { progressBar1.Dispatcher.Invoke(DispatcherPriority.Send, new Action(delegate { progressBar1.Value = con.Progress; } )); } } I get the Message (Title) when tring to do this with the below code: bmp = BitmapSource.Create(width, height, 96, 96, pf, null, rawImage, stride); this.Dispatcher.Invoke(DispatcherPriority.Send, new Action(delegate { img.Source = bmp; ViewBox.Child = img; //vllt am schluss } )); I will try to explain how my program works. I created a new Thread (because GUI dont response) for the calculation of the pixels and the colors. In this Thread(Mehtod) I´m using the Dispatcher to Refresh my Image in the ViewBox after the calculations are ready. When I´m dont put the calculation in a seperate Thread then I can refresh or build my Image.

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  • Rmagick Fails To Manipulate PNG

    - by Tyler DeWitt
    Following the Railscast episode on CarrierWave: I installed ImageMagick on Mountain Lion via homebrew, exported the following path: export PKG_CONFIG_PATH="/opt/local/lib/pkgconfig:$PKG_CONFIG_PATH" Symlinked the following: ln -s /usr/local/include/ImageMagick/wand /usr/local/include/wand ln -s /usr/local/include/ImageMagick/magick /usr/local/include/magick And installed rmagick via bundler. In my uploader I have the following: include CarrierWave::RMagick version :thumb do process :resize_to_limit => [85, 85] end Which creates thumbnails just fine, but not for png files. I've tried a handful of png images and it always fails with this error: Failed to manipulate with rmagick, maybe it is not an image? Original Error: no decode delegate for this image format `<path>/public/uploads/tmp/20121022-2133-9885-3333/thumb_cat_vs_internet.png' @ error/constitute.c/ReadImage/544 jpeg images work just fine. EDIT identify -list format | grep -i png returns nothing, indicating the png decode delegate is probably missing. Now what?

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  • UIActionSheet With PickerView not showing up in iPad

    - by user717452
    I am using the following code to add an actionsheet with a picker view on it to my app. From the iPhone, it displays perfectly, but when viewing on iPad (Universal app), it shows a very small pickerview with none of the other buttons right on the center of the page. UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"Select Chapter" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Select" otherButtonTitles:nil]; // Add the picker UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0,185,0,0)]; pickerView.delegate = self; pickerView.showsSelectionIndicator = YES; // note this is default to NO [menu addSubview:pickerView]; [menu showFromTabBar:self.tabBarController.tabBar]; [menu setBounds:CGRectMake(0,0,320, 700)]; [pickerView release]; [menu release];

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  • Are delegates copied during assignment to an event?

    - by Sir Psycho
    Hi, The following code seems to execute the FileRetrieved event more than once. I thought delegates were a reference type. I was expecting this to execute once. I'm going to take a guess and say that the reference is being passed by value, therefore copied but I don't like guesswork :-) public delegate void DirListEvent<T>(T dirItem); void Main() { DirListEvent<string> printFilename = s => { Console.WriteLine (s); }; var obj = new DirectoryLister(); obj.FileRetrieved += printFilename; obj.FileRetrieved += printFilename; obj.GetDirListing(); } public class DirectoryLister { public event DirListEvent<string> FileRetrieved; public DirectoryLister() { FileRetrieved += delegate {}; } public void GetDirListing() { foreach (var file in Directory.GetFiles(@"C:\")) { FileRetrieved(file); } } }

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  • No events are fired from an imagebrush via ImageOpened/ImageFailed

    - by umlgorithm
    A canvas is received from the server, and an image brush is extracted from the canvas via searching for a bunch of pathes. In summary, Canvas - Path - Path.Fill - ImageBrush. Now, I want to take a snapshot of the ImageBrush using WriteableBitmap when it is loaded and here is what I did var imageBrushes = VisualTreeUtility.FindVisualChildren<Path>(canvas) .Where(i => i.Fill.GetType() == typeof(ImageBrush)) .Select(p => p.Fill); foreach(var image in imageBrushes) { image.ImageOpened += delegate { //never gets here }; image.ImageFailed += delegate { //never gets here either }; // if the image is already loaded if (((BitmapSource)image.ImageSource).PixelWidth != 0) { // never gets here either } } As you can see the comments in the code above, no matter what I try, I can't seem to catch an event from the image. Any suggestions?

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  • VB to C# conversion incongruency with lambdas

    - by Jason
    I have a bit of code that I have been tasked with converting to C# from VB. A snippet of mine seems like it cannot be converted from one to the other, and if so, I just don't know how to do it and am getting a little frustrated. Here's some background: OrderForm is an abstract class, inherited by Invoice (and also PurchaseOrder). The following VB snippet works correctly: Dim Invs As List(Of OrderForm) = GetForms(theOrder.OrderID) .... Dim inv As Invoice = Invs.Find( Function(someInv As Invoice) thePO.SubPONumber = someInv.SubInvoiceNumber) In C#, the best I came to converting this is: List<OrderForm> Invs = GetForms(theOrder.OrderID); .... Invoice inv = Invs.Find( (Invoice someInv) => thePO.SubPONumber == someInv.SubInvoiceNumber); However, I get the following error when I do this: Cannot convert lambda expression to delegate type 'System.Predicate' because the parameter types do not match the delegate parameter types Is there any way to fix this without restructuring my whole codebase?

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  • Most Efficient Alternative Method of Storing Settings for iPhone Apps

    - by JPK
    I am not using the Settings bundle to store the settings for my app, as I prefer to allow the user to access the settings within the app (they may be changed fairly often). I do realize that there is the option to do both, but for now, I am trying to find the most optimal place to store the settings within the app. I have a good number of settings (from what I have read, probably too many for NSUserDefaults), and the two main options I am considering are: 1) storing the settings in a dictionary in the plist, loading the settings into a NSDictionary property in the app delegate and accessing them via the sharedDelegate 2) storing the settings in a Core Data entity (1 row on Settings entity), loading the settings into a Settings object in the app delegate and accessing them via the sharedDelegate Of these two, which would be the optimal method, performance wise?

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  • Why does C# exit when calling the Ada elaboration routine using debug?

    - by erict
    I have a DLL created in Ada using GPS. I am dynamically loading it and calling it successfully both from Ada and from C++. But when I try to call it from C#, the program exits on the call to Elaboration init. What am I missing? The exact same DLL is perfectly happy getting called from C++ and Ada. Edit: If I start the program without Debugging, it also works with C#. But if I run it with the Debugger, then it exits on the call to ElaborationInit. There are no indications in any of the Windows event logs. If the Ada DLL is Pure, and I skip the elaboration init call, the actual function DLL is called correctly, so it has something to do with the elaboration. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace CallingDLLfromCS { class Program { [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern IntPtr LoadLibrary(string dllToLoad); [DllImport("kernel32.dll", CharSet = CharSet.Ansi, SetLastError = true)] public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName); [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern bool FreeLibrary(IntPtr hModule); [UnmanagedFunctionPointer(CallingConvention.StdCall)] delegate int AdaCallable2_dlgt(int val); static AdaCallable2_dlgt fnAdaCallable2 = null; [UnmanagedFunctionPointer(CallingConvention.StdCall)] delegate void ElaborationInit_dlgt(); static ElaborationInit_dlgt ElaborationInit = null; [UnmanagedFunctionPointer(CallingConvention.StdCall)] delegate void AdaFinal_dlgt(); static AdaFinal_dlgt AdaFinal = null; static void Main(string[] args) { int result; bool fail = false; // assume the best IntPtr pDll2 = LoadLibrary("libDllBuiltFromAda.dll"); if (pDll2 != IntPtr.Zero) { // Note the @4 is because 4 bytes are passed. This can be further reduced by the use of a DEF file in the DLL generation. IntPtr pAddressOfFunctionToCall = GetProcAddress(pDll2, "AdaCallable@4"); if (pAddressOfFunctionToCall != IntPtr.Zero) { fnAdaCallable2 = (AdaCallable2_dlgt)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(AdaCallable2_dlgt)); } else fail = true; pAddressOfFunctionToCall = GetProcAddress(pDll2, "DllBuiltFromAdainit"); if (pAddressOfFunctionToCall != IntPtr.Zero) { ElaborationInit = (ElaborationInit_dlgt)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(ElaborationInit_dlgt)); } else fail = true; pAddressOfFunctionToCall = GetProcAddress(pDll2, "DllBuiltFromAdafinal"); if (pAddressOfFunctionToCall != IntPtr.Zero) AdaFinal = (AdaFinal_dlgt)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(AdaFinal_dlgt)); else fail = true; if (!fail) { ElaborationInit.Invoke(); // ^^^^^^^^^^^^^^^^^^^^^^^^^ FAILS HERE result = fnAdaCallable2(50); Console.WriteLine("Return value is " + result.ToString()); AdaFinal(); } FreeLibrary(pDll2); } } } }

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  • C# Converter difficulties

    - by Petr
    Hi, I am trying to fill object[] with List<string> but I cannot figure out how to use ConvertAll. MSDN did not help me. At first I tried to create an instance of Converter but it looks like it expects delegate? Converter<string, object> conv = new Converter<string, object>(??); //why delegate? this.comboBox1.Items.AddRange(Form1.AnimalType.ConvertAll<object>(conv)); Thanks :)

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  • iPhone: Crash When Deleting UITableView Rows

    - by Ajeet Kumar Yadav
    Hi, I am new in iPhone development. I am developing an application that fetches a value from a database and displays it in a table view. I want to delete table rows one by one but the rows do not delete and the application crashes. Here is my row deletion code: - (void)tableView:(UITableView *)tv commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if(editingStyle == UITableViewCellEditingStyleDelete) { SanjeevKapoorAppDelegate *appDelegate =(SanjeevKapoorAppDelegate *)[[UIApplication sharedApplication] delegate]; list *animal =[appDelegate.list1 objectAtIndex:indexPath.row]; [appDelegate deleteCoffee]; [self.tableView reloadData]; //Delete the object from the table. [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } I also delete all rows with this action: -(IBAction)deletebtn:(id)sender{ SanjeevKapoorAppDelegate *appDelegate =(SanjeevKapoorAppDelegate *)[[UIApplication sharedApplication] delegate]; [appDelegate deleteCoffee]; [self.tableView reloadData]; } How do I properly implement delete in an UITableView?

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  • Is this a valid pattern for raising events in C#?

    - by Will Vousden
    Update: For the benefit of anyone reading this, since .NET 4, the lock is unnecessary due to changes in synchronization of auto-generated events, so I just use this now: public static void Raise<T>(this EventHandler<T> handler, object sender, T e) where T : EventArgs { if (handler != null) { handlerCopy(sender, e); } } And to raise it: SomeEvent.Raise(this, new FooEventArgs()); Having been reading one of Jon Skeet's articles on multithreading, I've tried to encapsulate the approach he advocates to raising an event in an extension method like so (with a similar generic version): public static void Raise(this EventHandler handler, object @lock, object sender, EventArgs e) { EventHandler handlerCopy; lock (@lock) { handlerCopy = handler; } if (handlerCopy != null) { handlerCopy(sender, e); } } This can then be called like so: protected virtual void OnSomeEvent(EventArgs e) { this.someEvent.Raise(this.eventLock, this, e); } Are there any problems with doing this? Also, I'm a little confused about the necessity of the lock in the first place. As I understand it, the delegate is copied in the example in the article to avoid the possibility of it changing (and becoming null) between the null check and the delegate call. However, I was under the impression that access/assignment of this kind is atomic, so why is the lock necessary? Update: With regards to Mark Simpson's comment below, I threw together a test: static class Program { private static Action foo; private static Action bar; private static Action test; static void Main(string[] args) { foo = () => Console.WriteLine("Foo"); bar = () => Console.WriteLine("Bar"); test += foo; test += bar; test.Test(); Console.ReadKey(true); } public static void Test(this Action action) { action(); test -= foo; Console.WriteLine(); action(); } } This outputs: Foo Bar Foo Bar This illustrates that the delegate parameter to the method (action) does not mirror the argument that was passed into it (test), which is kind of expected, I guess. My question is will this affect the validity of the lock in the context of my Raise extension method? Update: Here is the code I'm now using. It's not quite as elegant as I'd have liked, but it seems to work: public static void Raise<T>(this object sender, ref EventHandler<T> handler, object eventLock, T e) where T : EventArgs { EventHandler<T> copy; lock (eventLock) { copy = handler; } if (copy != null) { copy(sender, e); } }

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  • Twitter's Bootstrap 2.x popover callback can't focus on element

    - by mozgras
    I've modified bootstrap's popover function to include a callback which works great. But in the callback I cannot programmatically focus on the first form field. Strange, because I can manipulate other elements in the callback function as well as focus on the element at other points. Here's the code to add a callback which I got from another SO question (http://stackoverflow.com/a/14727204/1596547): var tmp = $.fn.popover.Constructor.prototype.show; $.fn.popover.Constructor.prototype.show = function () { tmp.call(this); if (this.options.callback) { this.options.callback(); } } Here's the popover code: $('#a-editor-btn').popover({ html: true, placement: 'bottom', callback: function(){ $('#a-form-point').focus(); //nothing happens console.log('hello'); // works . . }, content: $('#a-form').html() }).parent().delegate('button#insert-point-btn', 'click', function() { insertPoint(); }).delegate('.a-form','keypress', function(e) { if ( e.which == 13 ) { insertPoint(); } });

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  • Using ManualResetEvent to wait for multiple Image.ImageOpened events

    - by umlgorithm
    Dictionary<Image, ManualResetEvent> waitHandleMap = new Dictionary<Image, ManualResetEvent>(); List<Image> images = GetImagesWhichAreAlreadyInVisualTree(); foreach (var image in images) { image.Source = new BitmapImage(new Uri("some_valid_image_url")); waitHandleMap.Add(image, new ManualResetEvent(false)); image.ImageOpened += delegate { waitHandleMap[image].Set(); }; image.ImageFailed += delegate { waitHandleMap[image].Set(); }; } WaitHandle.WaitAll(waitHandleMap.Values.ToArray()); WaitHandle.WaitAll blocks the current UI thread, so ImageOpened/ImageFailed events would never get fired. Could you suggest me an easy workaround to wait for the multiple ui events?

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  • Thread.sleep vs Monitor.Wait vs RegisteredWaitHandle?

    - by Royi Namir
    (the following items has different goals , but im interesting knowing how they "PAUSEd") questions Thread.sleep - Does it impact performance on a system ?does it tie up a thread with its wait ? what about Monitor.Wait ? what is the difference in the way they "wait"? do they tie up a thread with their wait ? what aboutRegisteredWaitHandle ? This method accepts a delegate that is executed when a wait handle is signaled. While it’s waiting, it doesn’t tie up a thread. so some thread are paused and can be woken by a delegate , while others just wait ? spin ? can someone please make things clearer ? edit http://www.albahari.com/threading/part2.aspx

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  • Cannot figure out how to get rid of memory leak

    - by Mark S.
    I'm trying to test for memory leaks in my iphone and I'm not having much luck getting rid of this one. Here is the code that is leaking. - (id)initWithManagedObjectContext:(NSManagedObjectContext *)aMoc delegate:(id)aDelegate runSync:(BOOL)aRunSync { if (self = [super init]) { self.moc = aMoc; self.settingsManager = [[VacaCalcSettingsManager alloc] initWithManagedObjectContext:self.moc]; self.delegate = aDelegate; calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; self.runSync = aRunSync; } return self; } It is leaking on the self.settingsManager = [[VacaCalcSettingsManager alloc] initWithManagedObjectContext:self.moc]; line. The self.settingManager instance variable is released in the dealloc method of the class. I'm not sure what other information would be pertinent. Please let me know and I can provide it. Thanks for any assistance. -Mark

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  • Lamda expression will not compile

    - by John Soer
    I am very confused I have this lamba expression tvPatientPrecriptionsEntities.Sort((p1, p2) => p1.MedicationStartDate.Value.CompareTo(p2.MedicationStartDate.Value)); Visual studio will not compile it and complains about syntax. I converted the lamba expression to an anonymous delegate as so tvPatientPrecriptionsEntities.Sort( delegate(PatientPrecriptionsEntity p1, PatientPrecriptionsEntity p2) { return p1.MedicationStartDate.Value.CompareTo(p2.MedicationStartDate.Value); } ); and it works fine. The project is uses the .net 3.5 framework and I have a reference to system.linq.

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  • How to pass the image from oneview to another view in iphone?

    - by Warrior
    I am new to iphone development.I want to display the image selected in a seperateview.I have used UIImagePickerController to pick the image from device library.On clicking the image i have to navigate to another view and display the image.How can i send the image o another view.I have used delegate methods for accessing string in other views.Is there any possibility to send the image via delegate methods. - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img1 editingInfo:(NSDictionary *)editInfo { [[picker parentViewController] dismissModalViewControllerAnimated:YES]; EmailPictureViewController *email = [[EmailPictureViewController alloc] initWithNibName:@"EmailPictureViewController" bundle:nil]; [self.navigationController pushViewController:email animated:YES]; } From the above code i have to set delegates for img1 which is of type UIImage. Is there any other way to achieve my task.Please help me out.Thanks.

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  • Detect when a UITableView is being reordered

    - by Mike Weller
    I have a UITableView backed by an NSFetchedResultsController which may trigger updates at any time. If the user is currently reordering rows, applying these updates will cause an exception because the table view has temporarily taken over and you get an error like Invalid update: invalid number of rows in section [...] How can I detect when the user has started moving a cell so I can delay updates caused by the fetched results controller? There don't seem to be any table view delegate methods to detect this. This delegate method: - (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath { Doesn't get called when the user initially detaches the first cell, only when they actually move it somewhere else.

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  • Core Animation bad access on device

    - by user1595102
    I'm trying to do a frame by frame animation with CAlayers. I'm doing this with this tutorial http://mysterycoconut.com/blog/2011/01/cag1/ but everything works with disable ARC, when I'm try to rewrite code with ARC, it's works on simulator perfectly but on device I got a bad access memory. Layer Class interface #import <Foundation/Foundation.h> #import <QuartzCore/QuartzCore.h> @interface MCSpriteLayer : CALayer { unsigned int sampleIndex; } // SampleIndex needs to be > 0 @property (readwrite, nonatomic) unsigned int sampleIndex; // For use with sample rects set by the delegate + (id)layerWithImage:(CGImageRef)img; - (id)initWithImage:(CGImageRef)img; // If all samples are the same size + (id)layerWithImage:(CGImageRef)img sampleSize:(CGSize)size; - (id)initWithImage:(CGImageRef)img sampleSize:(CGSize)size; // Use this method instead of sprite.sampleIndex to obtain the index currently displayed on screen - (unsigned int)currentSampleIndex; @end Layer Class implementation @implementation MCSpriteLayer @synthesize sampleIndex; - (id)initWithImage:(CGImageRef)img; { self = [super init]; if (self != nil) { self.contents = (__bridge id)img; sampleIndex = 1; } return self; } + (id)layerWithImage:(CGImageRef)img; { MCSpriteLayer *layer = [(MCSpriteLayer*)[self alloc] initWithImage:img]; return layer ; } - (id)initWithImage:(CGImageRef)img sampleSize:(CGSize)size; { self = [self initWithImage:img]; if (self != nil) { CGSize sampleSizeNormalized = CGSizeMake(size.width/CGImageGetWidth(img), size.height/CGImageGetHeight(img)); self.bounds = CGRectMake( 0, 0, size.width, size.height ); self.contentsRect = CGRectMake( 0, 0, sampleSizeNormalized.width, sampleSizeNormalized.height ); } return self; } + (id)layerWithImage:(CGImageRef)img sampleSize:(CGSize)size; { MCSpriteLayer *layer = [[self alloc] initWithImage:img sampleSize:size]; return layer; } + (BOOL)needsDisplayForKey:(NSString *)key; { return [key isEqualToString:@"sampleIndex"]; } // contentsRect or bounds changes are not animated + (id < CAAction >)defaultActionForKey:(NSString *)aKey; { if ([aKey isEqualToString:@"contentsRect"] || [aKey isEqualToString:@"bounds"]) return (id < CAAction >)[NSNull null]; return [super defaultActionForKey:aKey]; } - (unsigned int)currentSampleIndex; { return ((MCSpriteLayer*)[self presentationLayer]).sampleIndex; } // Implement displayLayer: on the delegate to override how sample rectangles are calculated; remember to use currentSampleIndex, ignore sampleIndex == 0, and set the layer's bounds - (void)display; { if ([self.delegate respondsToSelector:@selector(displayLayer:)]) { [self.delegate displayLayer:self]; return; } unsigned int currentSampleIndex = [self currentSampleIndex]; if (!currentSampleIndex) return; CGSize sampleSize = self.contentsRect.size; self.contentsRect = CGRectMake( ((currentSampleIndex - 1) % (int)(1/sampleSize.width)) * sampleSize.width, ((currentSampleIndex - 1) / (int)(1/sampleSize.width)) * sampleSize.height, sampleSize.width, sampleSize.height ); } @end I create the layer on viewDidAppear and start animate by clicking on button, but after init I got a bad access error -(void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; NSString *path = [[NSBundle mainBundle] pathForResource:@"mama_default.png" ofType:nil]; CGImageRef richterImg = [UIImage imageWithContentsOfFile:path].CGImage; CGSize fixedSize = animacja.frame.size; NSLog(@"wid: %f, heigh: %f", animacja.frame.size.width, animacja.frame.size.height); NSLog(@"%f", animacja.frame.size.width); richter = [MCSpriteLayer layerWithImage:richterImg sampleSize:fixedSize]; animacja.hidden = 1; richter.position = animacja.center; [self.view.layer addSublayer:richter]; } -(IBAction)animacja:(id)sender { if ([richter animationForKey:@"sampleIndex"]) {NSLog(@"jest"); } if (! [richter animationForKey:@"sampleIndex"]) { CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"sampleIndex"]; anim.fromValue = [NSNumber numberWithInt:0]; anim.toValue = [NSNumber numberWithInt:22]; anim.duration = 4; anim.repeatCount = 1; [richter addAnimation:anim forKey:@"sampleIndex"]; } } Have you got any idea how to fix it? Thanks a lot.

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  • iPhone: Using a Singleton with Tabview Controller and Navigation Controller

    - by malleswar
    Hi Friends, I have developed a small iPhone application by using singleton that I use to navigate through the views. Here is a sample method from my singleton class. + (void) loadMenuController:(NSMutableArray *)menuItems{ MenuViewController *menuViewControler = [[MenuViewController alloc] initWithNibName:@"MenuViewController" bundle:nil]; [menuViewControler setMenuItems:menuItems]; RootViewController *root = ( P2MAppDelegate *appDelegate = (P2MAppDelegate*) [[UIApplication sharedApplication] delegate]; UINavigationController *navController = [appDelegate navigationController]; [navController pushViewController:menuViewControler animated:YES]; [menuViewControler release]; } Now my requirement has changed to require a tab view controller . I could change my application delegate to a tabview controller but I still need to navigate inside each tab. I am unable get a clue how to navigate from my singleton class. Please guide me. Please let me know if my query is not clear. Thanks in advance. Regards, Malleswar

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  • Returning NSNull from actionForLayer:forKey

    - by MrHen
    If I implement the CALayer delegate method actionForLayer:forKey I can return [NSNull null] to force the CALayer to not animate any changes. Unfortunately, [NSNull null] doesn't implement the CAAction delegate and XCode kicks out the following warning: warning: class 'NSNull' does not implement the 'CAAction' protocol Here is the method code: - (id<CAAction>)actionForLayer:(CALayer *)theLayer forKey:(NSString *)theKey { //This disables the animations when moving things around //Also, don't animate the selection box. It was doing weird things if(undoGroupStarted || theLayer == self.selectionBox) { return [NSNull null]; } else { return nil; } } Am I doing something wrong? Is returning [NSNull null] bad behavior? If so, what is another way to do what I am trying to do here? If not, how do I make the compiler happy?

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  • How to binding to bit datatype in SQL to Booleans/CheckBoxes in ASP.NET MVC 2 with DataAnnotations

    - by nvtthang
    I've got problem with binding data type boolean to checkbox in MVC 2 data annotations Here's my code sample: label> Is Hot </label> <%=Html.CheckBoxFor(model => model.isHot, new {@class="input" })%> It always raise this error message below at (model=model.isHot). Cannot convert lambda expression to delegate type 'System.Func<Framework.Models.customer,bool>' because some of the return types in the block are not implicitly convertible to the delegate return type Cannot implicitly convert type 'bool?' to 'bool'. An explicit conversion exists (are you missing a cast?) Please suggest me how can I solve this problem? Thanks in advance.

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