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POWhat could cause [UIImage imageWithData] to crash when it comes back
 

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  1. POWhat could cause [UIImage imageWithData] to crash when it comes back
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    <p>I have this code in one of my <code>NSManagedObjects</code>:</p> <pre><code>if (self.tempImageStorage) { return self.tempImageStorage; } else if(self.imageData) { NSLog(@"%@ %d",self.imageData, self.imageData.length); self.tempImageStorage = [UIImage imageWithData:self.imageData]; return self.tempImageStorage; } </code></pre> <p>Occasionally, usually when I'm flipping through the images quickly, it will come back with an <code>EXC_BAD_ACCESS</code> on the 5th line (UIImage imageWithData line), and I can't po (printobject) self in the console, so I assume that the <code>NSMananagedObject</code> itself has been deallocated. What doesn't make sense is that it was able to reference self for the 2 ifs, and I even log the image data and its length just fine right before it. </p> <p>How could the <code>NSManagedObject</code> be deallocated in during that period since this is all happening on the same thread (and it's the main thread)?</p> <p>PS: I have Zombies enabled but it still doesn't let me po self.</p> <p>Code that sets the image data:</p> <pre><code>- (void) processRequest:(ASIHTTPRequest *) request { UIImage * orig = [UIImage imageWithData:[request responseData]]; CGSize targetSize = isPad()?CGSizeMake(446,150):CGSizeMake(320, 108); CGRect fourPanelSize = CGRectMake(0, 0, 1000, 336); CGImageRef imageRef = CGImageCreateWithImageInRect([orig CGImage], fourPanelSize); CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef); CGColorSpaceRef colorSpaceInfo = CGImageGetColorSpace(imageRef); if (bitmapInfo == kCGImageAlphaNone || bitmapInfo == kCGImageAlphaLast) { bitmapInfo = kCGImageAlphaPremultipliedLast; } CGContextRef bitmap; bitmap = CGBitmapContextCreate(NULL, targetSize.width, targetSize.height, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo); CGContextDrawImage(bitmap, CGRectMake(1, 1, targetSize.width-2, targetSize.height-2), imageRef); CGImageRef ref = CGBitmapContextCreateImage(bitmap); UIImage* newImage = [UIImage imageWithCGImage:ref]; CGContextRelease(bitmap); CGImageRelease(ref); NSData * thumbData = UIImagePNGRepresentation(newImage); NSData * imageData = UIImagePNGRepresentation(orig); //Post notification on main thread since it will be updating the UI [[NSOperationQueue mainQueue] addOperationWithBlock:^{ self.tempImageThumbStorage = newImage; self.imageThumbnailData = thumbData; self.tempImageStorage = orig; self.imageData = imageData; [(AppDelegate*)[UIApplication sharedApplication].delegate saveContext]; NSMutableDictionary * userInfo = [[NSMutableDictionary alloc] initWithCapacity:1]; [userInfo setObject:[NSNumber numberWithBool:YES] forKey:@"status"]; [userInfo setObject:self forKey:@"comic"]; [[NSNotificationCenter defaultCenter] postNotificationName:PCRLoadMediahNotification object:self userInfo:userInfo]; strongSelf = nil; }]; } </code></pre>
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    1. PTQuestion
    1. USJay Bhalani
    1. USPhilippe Sabourin
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      1. POWhat could cause [UIImage imageWithData] to crash when it comes back
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      1. VTUpMod
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    1. COYou'll need to post more code about how you are handling the changing of images. Also, your `self.imageData` may not be formatted correctly, and is causing `imageWithData` to return some garbage value.
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      1. POWhat could cause [UIImage imageWithData] to crash when it comes back
      1. USmsgambel
    2. COI've added the code that sets the imagedata. If the imagedata was in the wrong format or incorrect though, it would be a different error, I'm pretty sure. Also, considering that this is happening on the main thread and imageData can only be set on the main thread, I'm not really sure how it would be corrupted. The weird part is that "self" and "imageData" is ok the line above, but then when you come back from the call "self" is no longer a good object.
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      1. POWhat could cause [UIImage imageWithData] to crash when it comes back
      1. USPhilippe Sabourin
 

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