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POAdding images to an array memory issue
 

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  1. POAdding images to an array memory issue
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    <p>I'm currently facing the following issue:</p> <p>My app dynamically creates images (320 x 480 pixels) and adds them to a NSMutableArray. I need those images inside that array in order to allow users to browse through them back and forth. I only need to keep the latest 5 images. So I wrote a method like below:</p> <pre><code>- (void)addImageToArray:(UIImage*)theImage { if ([myMutableArray count] &lt; 5) { [myMutableArray addObject:theImage]; } else { [myMutableArray removeObjectAtIndex:0]; [myMutableArray addObject:theImage]; } } </code></pre> <p>This method basically does what it's supposed to do. However, in instruments I can see, that memory usage is permanently incrementing. At some point, even though I do not have any memory leaks, the app finally crashes. The way I see it, XCode does remove the image from my array, but does not release it. Is there a way I can make sure, that the object I want to remove from my array will also get released? Maybe my approach is completely wrong and I need to find a different way.</p> <p>Any help appreciated. Thanks in advance</p> <p>[EDIT:]</p> <p>As requested, I'm adding part of my code, which creates the image:</p> <pre><code>-(UIImage*)getGL { unsigned char buffer[320*480*4]; glReadPixels(0,0,320,480,GL_RGBA,GL_UNSIGNED_BYTE,&amp;buffer); CGDataProviderRef ref = CGDataProviderCreateWithData(NULL, &amp;buffer, 320*480*4, NULL); CGImageRef iref = CGImageCreate(320,480,8,32,320*4,CGColorSpaceCreateDeviceRGB(),kCGBitmapByteOrderDefault,ref,NULL,true,kCGRenderingIntentDefault); size_t width = CGImageGetWidth(iref); size_t height = CGImageGetHeight(iref); size_t length = width*height*4; uint32_t *pixels = (uint32_t *)malloc(length); CGContextRef _context = CGBitmapContextCreate(pixels, width, height, 8, width*4, CGImageGetColorSpace(iref), kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big); CGContextTranslateCTM(_context, 0.0, height); CGContextScaleCTM(_context, 1.0, -1.0); CGContextDrawImage(_context, CGRectMake(0.0, 0.0, width, height), iref); CGImageRef outputRef = CGBitmapContextCreateImage(_context); UIImage *outputImage = [UIImage imageWithCGImage:outputRef]; CGDataProviderRelease(ref); CGImageRelease(iref); CGImageRelease(outputRef); CGContextRelease(_context); return outputImage; } </code></pre> <p>So, now I can do something like this:</p> <pre><code>[self addImageToArray:[self getGL]]; </code></pre> <p>Hope, this helps. Thanks again.</p>
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    1. COHave you *disabled* NSZombie?
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    2. COThe problem may lie with the way you initialize theImage. Include that section of your code in your question too.
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    3. COI don't remember enabling it in the first place. Is it switched on by default?
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