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  • iPhone programming - problem with CoreFoundation forking

    - by Tom
    Hello all, I've been working on an iPhone for several months. It's a 2d shooting game akin to the old Smash TV type games. I'm doing everything alone and it has come out well so far, but now I am getting unpredictable crashes which seem to be related to CoreFoundation forking and not exec()ing, as the message __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONA LITY___YOU_MUST_EXEC__ always shows up somewhere in the debugger. Usually it shows up around a CFRunLoopRunSpecific and is related to either a timer firing or _InitializeTouchTapCount. I cannot figure out exactly what is causing the fork to occur. My main game loop is running on a timer, first updating all the logic and then drawing everything with openGL. There is nothing highly complex or unusual. I understand you cannot make CF calls on the childside of a fork, or access shared memory and things like that. I am not explicitly trying to fork anything. My question is: can anyone tell me what type of activity might cause CoreFoundation to randomly fork like this? I'd really like to finish this game and I don't know how to solve this problem. Thanks for any help.

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  • Programmatical Creation of NSMappingModel

    - by enchilada
    I want to programmatically (without Lightweight Migration) create a mapping model between two models that are exactly the same, except one of the entities (there are a bunch of entities) has different attributes. Let's call this entity "Person". And let's say the destination model has 1) added a new attribute called "address" 2) deleted an attribute called "eyeColor" 3) kept (i.e. not done anything with) an attribute called "name" How would you create an NSMappingModel between these models programmatically? I happen to have some explicit questions that might help me do this by myself: Q1) Do I have to create NSEntityMapping objects for all of the entities other than "Person", even if they remain unchanged? Q2) How do I deal with the "address" attribute in "Person", which is a new one being created? Should I create an NSPropertyMapping for that somehow, that turns nothing into something ("address")? Q3) How do I deal with the "name" attribute in "Person"? Do I have to create an NSPropertyMapping for that, even though it simply stays the same? Q4) For the NSEntityMapping corresponding to "Person", is not creating any NSPropertyMapping for "eyeColor" a proper way to get it deleted? Or should I create an NSPropertyMapping for "eyeColor"? If yes, how would this object be created, i.e. what would determine that its purpose is to get rid of "eyeColor"? Thank you in advance, and I apologize not being able to answer these questions myself, as the documenation really has no good example of how to create NSMappingModels programmatically. Note again that I'm not allowed to use Lightweight Migration. I must do this manually.

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  • Removing all CALayer's sublayers

    - by radex
    Hi. I have trouble with deleting all layer's sublayers. I do this manually, but it's unwanted code clutter. I found many topics about this in google, but no answer. I tried to do something like this: for(CALayer *layer in rootLayer.sublayers) { [layer removeFromSublayer]; } but it didn't work. Also, i tried to clone rootLayer.sublayers into separate NSArray, but result was the same. Any ideas? regards, radex PS. sorry for my English. Edit: I thought it works now, but I was wrong. It works good with CALayers, but it doesn't work with CATextLayers. Any ideas?

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  • Are Multiple Iterators possible in php?

    - by artvolk
    Good day! I know that C# allows multiple iterators using yield, like described here: http://stackoverflow.com/questions/1754041/is-multiple-iterators-is-possible-in-c In PHP there is and Iterator interface. Is it possible to implement more than one iteration scenario for a class? More details (EDIT): For example I have class TreeNode implementing single tree node. The whole tree can be expressed using only one this class. I want to provide iterators for iterating all direct and indirect children of current node, for example using BreadthFirst or DepthFirst order. I can implement this Iterators as separate classes but doing so I need that tree node should expose it's children collection as public. C# pseudocode: public class TreeNode<T> { ... public IEnumerable<T> DepthFirstEnumerator { get { // Some tree traversal using 'yield return' } } public IEnumerable<T> BreadthFirstEnumerator { get { // Some tree traversal using 'yield return' } } }

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  • Updates to NSDictionary attribute in CoreData not saving

    - by sfkaos
    I have created an Entity in CoreData that includes a Transformable attribute type implemented as an NSDictionary. The NSDictionary attribute only contains values of a custom class. The properties of the custom class are all of type NSString. The custom class complies with NSCoding implementing: -(void)encodeWithCoder:(NSCoder*)coder; -(id)initWithCoder:(NSCoder *)coder When saving the Entity for the first time all attributes including the Transformable (NSDictionary) type are properly saved in the DB. When the same Entity is fetched from the DB and updated (including the Transformable attribute) it seems to be updated properly. However, when the app is closed and then reopened fetching the Entity does not show the updated Transformable attribute-type though the rest of the attributes of type NSDate and NSString are up-to-date. The Transformable attribute is the original saved value not the updated value. Is this a problem with KVO or am I missing something else when trying to save an NSDictionary filled with a custom class to CoreData?

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  • AudioQueueOfflineRender returning empty data

    - by hyn
    I'm having problems using AudioQueueOfflineRender to decode AAC data. When I examine the buffer after the call, it is always filled with empty data. I made sure the input buffer is valid and packet descriptions are provided. I searched and found that a few others have had the same problem: http://lists.apple.com/archives/Coreaudio-api/2008/Jul/msg00119.html Also, the inTimestamp argument doesn't make sense to me. Why should the renderer care where in the audio the beginning of the buffer corresponds to? The function throws an error if I pass in NULL, so I pass in the timestamp anyway.

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  • Triggering shouldStartLoadWithRequest with multiple window.location.href calls

    - by AlBeebe
    Im trying to pass multiple things from a webpage inside a UIWebView back to my iPhone app via the shouldStartLoadWithRequest method of the UIWebView. Basically my webpage calls window.location.href = "command://foo=bar" and i am able to intercept that in my app no problem. Now if i create a loop and do multiple window.location.href calls at once, then shouldStartLoadWithRequest only appears to get called on once and the call it gets is the very last firing of window.location.href at the end of the loop. The same thing happens with the webview for Android, only the last window.location.href gets processed.

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  • How to change the font size gradually in a UILabel?

    - by Flocked
    Hello, is there a way to change the font size gradually in a UILabel? I tried it with: [UIView beginAnimations:@"foo" context:nil]; [UIView setAnimationDuration:0.8]; uiLabel.font = [UIFont boldSystemFontOfSize:144]; [UIView commitAnimations]; The problem is that the change of the font size happens instantly.

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  • Objective-C: fetchManagedObjectsForEntity problem

    - by Meko
    Hi.I am trying to get value from CoreData entity name Person with predicate and then comparing with new data in dictionary.But it it returns every time 0 .And it creates about 5 person with same name. NSPredicate *predicate = [NSPredicate predicateWithFormat:@"userName == %@",[flickr usernameForUserID:@"owner"]]; peopleList = (NSMutableArray *)[flickr fetchManagedObjectsForEntity:@"Person" withPredicate:predicate]; NSEnumerator *enumerator = [peopleList objectEnumerator]; Person *person; BOOL exists = FALSE; while (person = [enumerator nextObject]) { NSLog(@" Person is: %@ ", person.userName); NSLog(@"Person ID IS %@",person.userID); NSLog(@"Dict ID is %@",[dict objectForKey:@"owner"]); if([person.userID isEqualToString:[dict objectForKey:@"owner"]]) { exists = TRUE; NSLog(@"-- Person Exists : %@--", person.userName); [newPhoto setPerson:person]; } } Here peopleList returns 0 and the enumerator also 0 and it does not use if and not comparing.In my entity I have Person and Photo entities.In Person I have userName and userID attributes and also one-to many relationship with Photo entity. I think problem in predicate but i cant figure out it .

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  • How to make an NSOutlineView indent multiple columns?

    - by Rinzwind
    What would be the easiest or recommended way for making an NSOutlineView indent multiple columns? By default, it only indents the outline column; and as far as I know there is no built-in support for making it indent other columns. I have an NSOutlineView which shows a comparison between two sets of hierarchical data. For visual appeal, if some item in the outline column is indented, I'd like to indent the item on the same row in another column by the same indentation amount. (There's also a third column which shows the result of comparing the two items, this column should never be indented.) Can this only be achieved by subclassing NSOutlineView? And what would need to be overridden in the subclass? Or is there an easier way to get it to indent multiple columns?

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  • Blending Three Images into Graphics Context Using Alpha Blend Mode kBlendModeOverlay

    - by steganous
    Does kCGBlendModeOverlay not work exactly like Photoshop's Overlay blending mode? I'm trying to overlay three images into a graphic context via: [uiimageGreen drawAtPoint:CGPointMake(x, y) blendMode:kCGBlendModeOverlay alpha:1.0]; [uiimageRed drawAtPoint:CGPointMake(x, y) blendMode:kCGBlendModeOverlay alpha:1.0]; [uiimageBlue drawAtPoint:CGPointMake(x, y) blendMode:kCGBlendModeOverlay alpha:1.0]; In the end, if I overlay just two of the three, the result is much closer to my desired output color in places where both images intersect. Adding the third image, however, causes the first-drawn image's color to be dominant in the resulting mix of colors. (e.g. in the above code, green comes out dominant, when the result should actually be white) Do you get the same result if you try?

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  • Updating a deallocated UIWebView from a background thread

    - by Dan Ray
    As you can see from the title, I've programmed myself into a corner and I've got several things working against me... In a UIViewController subclass that manages a large and complex view. One part of it is a UIWebView that contains output from a web request that I had to build and execute, and manually assemble HTML from. Since it takes a second or two to run, I dropped it into the background by calling self performSelectorInBackground:. Then from that method I call there, I use self performSelectorOnMainThread: to get back to the surface of the thread stack to update the UIWebView with what I just got. Like this (which I've cut down to show only the relevant issues): -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { //then get mapquest directions NSLog(@"Got called to handle new location!"); [manager stopUpdatingLocation]; [self performSelectorInBackground:@selector(getDirectionsFromHere:) withObject:newLocation]; } - (void)getDirectionsFromHere:(CLLocation *)newLocation { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; CLLocationCoordinate2D here = newLocation.coordinate; // assemble a call to the MapQuest directions API in NSString *dirURL // ...cut for brevity NSLog(@"Query is %@", dirURL); NSString *response = [NSString stringWithContentsOfURL:[NSURL URLWithString:dirURL] encoding:NSUTF8StringEncoding error:NULL]; NSMutableString *directionsOutput = [[NSMutableString alloc] init]; // assemble response into an HTML table in NSString *directionsOutput // ...cut for brevity [self performSelectorOnMainThread:@selector(updateDirectionsWithHtml:) withObject:directionsOutput waitUntilDone:NO]; [directionsOutput release]; [pool drain]; [pool release]; } - (void)updateDirectionsWithHtml:(NSString *)directionsOutput { [self.directionsWebView loadHTMLString:directionsOutput baseURL:nil]; } This all works totally great, UNLESS I've backed out of this view controller before CLLocationManager hits its delegate method. If this happens after I've already left this view, I get: 2010-06-07 16:38:08.508 EverWondr[180:760b] bool _WebTryThreadLock(bool), 0x1b6830: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now... Despite what this says, I can repeatably cause this crash when I back out too early. I'm not at all convinced that attempting a UI update from a background thread is really the issue; I think it's that my UIWebView is deallocated. I suspect that the fact I was just IN a background thread makes the runtime suspect something's up about that, but I feel fairly sure that's not it. So how do I tell CLLocationManager not to worry about it, when I'm backing out of that view? I tried [self.locationManager stopUpdatingLocation] inside my viewWillDisappear method, but that didn't do it. (Incidentally, MapQuest's apis are FANTASTIC. Way WAY better than anything Google provides. I can't recommend them highly enough.)

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  • CAShapeLayer slowing down interface rotation

    - by MrMage
    Hi, I am trying to move some custom drawing code from a view into a CAShapeLayer, which then get added as a sublayer to the original view's CALayer. This also works well, but when rotating the device, the animation starts to stutter, e.g. you just see the frame in the original orientation and then the final orientation, with at most one frame in between - not smooth at all. Slide-in and slide-out animations of the corresponding UIViewController are a bit jerky, too (but not that much). All the CAShapeLayer has in its path is one CGPathAddRect, it is set to be opaque, its opacity is 1.0f and the fillColor is set to opaque blue. When drawing the path directly in the views drawRect method, however, the animation is smooth. So I suppose it has something to do with the CAShapeLayer being animated during the rotation. Could you tell me how to either get rid of those jerkiness or just hide the CAShapeLayer when animating? Getting back to just draw CGPaths directly is not an option to me because I rely on the ability of CAShapeLayer to animate its path (it is not animated in my tries with rotating the view). /update: this also happens when the rotating UIViewControllers view contains a view with a subclass of CAGradientLayer as its layerClass (e.g. a view with a gradient layer as background). Cheers MrMage

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  • AudioQueue in-memory playback example

    - by Jonesy
    Does anybody know of any examples using AudioQueue that play from an in-memory source? All the examples I can find play from files (using AudioFileReadPackets) but in my particular case I am generating the data myself in realtime so ideally, I want to enqueue the data myself rather than sucking it out of a file using the callback. Any help much appreciated.

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  • Multiple Condition Coverage Testing

    - by David Relihan
    Hi Folks, When using the White Box method of testing called Multiple Condition Coverage, do we take all conditional statements or just the ones with multiple conditions? Now maybe the clues in the name but I'm not sure. So if I have the following method void someMethod() { if(a && b && (c || (d && e)) ) //Conditional A { } if(z && q) // Conditional B { } } Do I generate the truth table for just "Conditional A", or do I also do Conditional B? Thanks,

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  • How to get objects after CoreData Context merged

    - by Emmettoc
    Hi, I tried to save data and merge with CoreData and multi-thread for iPhone app. But I can't get managed objects in the main thread after merging. I wrote code just like this: [managedObjectContext performSelectorOnMainThread:@selector(mergeChangesFromContextDidSaveNotification:) withObject:notification waitUntilDone:YES]; [self performSelectorOnMainThread:@selector(didMerged:) withObject:objectIds waitUntilDone:YES]; So I tried to pass objectIds to get NSManagedObject instances in the main thread which were generated in another thread. At first I tried "objectWithId" method but it generated fault objects. Then I tried "existingObjectWithID" method but it generated objects partly and others were nil with following Error: [Error] Error Domain=NSCocoaErrorDomain Code=133000 "Operation could not be completed. (Cocoa error 133000.)" What is wrong? Is there any way how to retrieve all objects by objectIds after merging in another thread? Thank you.

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  • NSPredicate acting strange in NSFetchedResultsController

    - by Scott Langendyk
    I feel as if this should be very simple, but it's behaving strangely. I have 3 entities, with a relationship as such Entity A <-- Entity B <<-- Entity C I have an NSFetchedResults controller and I'm trying to filter the results of Entity A using the following predicate. [NSPredicate predicateWithFormat:@"NONE entityB.entityC == %@", self.entityC]; When I try and run the app, the output shows no results. I can alter the predicate slightly to: [NSPredicate predicateWithFormat:@"ANY entityB.entityC == %@", self.entityC]; And it shows me only the results that I want it to filter out. Why is this happening?

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  • How to access pixels of an NSBitmapImageRep?

    - by Paperflyer
    I have an NSBitmapImageRep that is created like this: NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL pixelsWide:waveformSize.width pixelsHigh:waveformSize.height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:YES colorSpaceName:NSCalibratedRGBColorSpace bytesPerRow:0 bitsPerPixel:0]; Now I want to access the pixel data so I get a pointer to the pixel planes using unsigned char *bitmapData; [imageRep getBitmapDataPlanes:&bitmapData]; According to the Documentation this returns a C array of five character pointers. But how can it do that? since the type of the argument is unsigned char **, it can only return an array of chars, but not an array of char pointers. So, this leaves me wondering how to access the individual pixels. Do you have an idea how to do that? (I know there is the method – setColor:atX:y:, but it seems to be pretty slow if invoked for every single pixel of a big bitmap.)

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  • Is there a way to pause a CABasicAnimation?

    - by mclaughlinj
    I have a basic spinning animation of the iPhone. Is there any way that I can "pause" the animation so that the position of the view will be maintained? I guess one way of doing this would be to cause the animation to "complete" instead of calling "remove" on it, how would I do that? CABasicAnimation* rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2]; rotationAnimation.duration = 100; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = HUGE_VALF; rotationAnimation.removedOnCompletion = NO; rotationAnimation.fillMode = kCAFillModeForwards; [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];

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  • Error loading my managedObjectModel

    - by niklassaers
    Hi guys, When I call [myAppDelegate managedObjectModel], in the retain line below, my application will crash (iPhone SDK v3.1.3): - (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel != nil) { return managedObjectModel; } managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; return managedObjectModel; } Here is my crash trace #0 0x905c44e6 in objc_exception_throw #1 0x01e78c3b in +[NSException raise:format:arguments:] #2 0x01e78b9a in +[NSException raise:format:] #3 0x000af99b in _NSArrayRaiseInsertNilException #4 0x0001c360 in -[NSCFArray insertObject:atIndex:] #5 0x0001c274 in -[NSCFArray addObject:] #6 0x01c16a7e in +[NSManagedObjectModel mergedModelFromBundles:] #7 0x00002432 in -[myAppDelegate managedObjectModel] at myAppDelegate.m:102 What is going on here? This is template code that I haven't seen fail before. Cheers Nik

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  • How to find State location from iphone GPS?

    - by Silent
    Hello all I'm trying to add to my program that locates the person in GPS but sets a value to the State that person is in so example: GPS Locates person from his/her iphone then returns the state they are in so say its California then the state variable gets set to California as a string would someone have an example any help is appreciated thanks!

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  • change fillColor of selected CAShapeLayer

    - by Frank
    I'm trying to change the fillColor of a CAShapeLayer when the layer it's contained in is touched. I'm able to change the background color of the tapped layer like this: -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { CALayer *layer = [(CALayer *)self.view.layer.presentationLayer hitTest:point]; layer = layer.modelLayer; layer.backgroundColor = [UIColor blueColor].CGColor; } This turns the background of "layer" blue as expected. My problem is how do I change the color of the CAShapelayer inside "layer"? Thanks!

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  • Problems using wxWidgets (wxMSW) within multiple DLL instances

    Preface I'm developing VST-plugins which are DLL-based software modules and loaded by VST-supporting host applications. To open a VST-plugin the host applications loads the VST-DLL and calls an appropriate function of the plugin while providing a native window handle, which the plugin can use to draw it's GUI. I managed to port my original VSTGUI code to the wxWidgets-Framework and now all my plugins run under wxMSW and wxMac but I still have problems under wxMSW to find a correct way to open and close the plugins and I am not sure if this is a wxMSW-only issue. Problem If I use any VST-host application I can open and close multiple instances of one of my VST-plugins without any problems. As soon as I open another of my VST-plugins besides my first VST-plugin and then close all instances of my first VST-plugin the application crashes after a short amount of time within the wxEventHandlerr::ProcessEvent function telling me that the wxTheApp object isn't valid any longer during execution of wxTheApp-FilterEvent (see below). So it seems to be that the wxTheApp objects was deleted after closing all instances of the first plugin and is no longer available for the second plugin. bool wxEvtHandler::ProcessEvent(wxEvent& event) { // allow the application to hook into event processing if ( wxTheApp ) { int rc = wxTheApp->FilterEvent(event); if ( rc != -1 ) { wxASSERT_MSG( rc == 1 || rc == 0, _T("unexpected wxApp::FilterEvent return value") ); return rc != 0; } //else: proceed normally } .... } Preconditions 1.) All my VST-plugins a dynamically linked against the C-Runtime and wxWidgets libraries. With regard to the wxWidgets forum this seemed to be the best way to run multiple instances of the software side by side. 2.) The DllMain of each VST-Plugin is defined as follows: // WXW #include "wx/app.h" #include "wx/defs.h" #include "wx/gdicmn.h" #include "wx/image.h" #ifdef __WXMSW__ #include <windows.h> #include "wx/msw/winundef.h" BOOL APIENTRY DllMain ( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: { wxInitialize(); ::wxInitAllImageHandlers(); break; } case DLL_THREAD_ATTACH: break; case DLL_THREAD_DETACH: break; case DLL_PROCESS_DETACH: wxUninitialize(); break; } return TRUE; } #endif // __WXMSW__ class Application : public wxApp {}; IMPLEMENT_APP_NO_MAIN(Application) Question How can I prevent this behavior respectively how can I properly handle the wxTheApp object if I have multiple instances of different VST-plugins (DLL-modules), which are dynamically linked against the C-Runtime and wxWidgets libraries? Best reagards, Steffen

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