Objective C，iOS - 收到内存警告
我目前正在开发一个 iOS 项目，该项目取得了良好的进展，但是整个内存问题 在 iOS 上无法正常工作。
iPhone 摄像头记录一个流。我有一个通过队列执行的捕获方法。 摄像机图像转换为灰度图像。它运作良好，但一段时间后会给出一些 内存警告并关闭应用程序，因为内存不足。
我发现这里的错误源
CGColorSpaceRef colorSpaceGray = CGColorSpaceCreateDeviceGray();
CGContextRef newContextGray = CGBitmapContextCreate(baseAddressGray, width, height, 8, width, colorSpaceGray, kCGImageAlphaNone);
CGImageRef GrayImage = CGBitmapContextCreateImage(newContextGray);
UIImage *img= [UIImage imageWithCGImage:GrayImage scale:1.0 orientation:UIImageOrientationRight];
[self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:img waitUntilDone:NO];
free(baseAddressGray);
CGColorSpaceRelease(colorSpaceGray);
CGContextRelease(newContextGray);
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
全部位于自动释放池中，该池随后被耗尽。 根据我的理解，崩溃源所在的行是
CGContextRef newContextGray = CGBitmapContextCreate(baseAddressGray, width, height, 8, width, colorSpaceGray, kCGImageAlphaNone);
，这里应该没有内存问题，因为
CGColorSpaceRelease(colorSpaceGray);
CGContextRelease(newContextGray);
已被释放。
我在这里做错了什么，或者缺少什么？
i am currently working on an iOS project which makes good progress, but the whole memory thing
on iOS is not working properly.
The iphone camera records a a stream. I have a capture method which is executed via a queue.
The camer image is converted to greyscale. It works well but after a while gives some
memory warning and closes the app, because its out of memory.
I have spotted the error source to here
CGColorSpaceRef colorSpaceGray = CGColorSpaceCreateDeviceGray();
CGContextRef newContextGray = CGBitmapContextCreate(baseAddressGray, width, height, 8, width, colorSpaceGray, kCGImageAlphaNone);
CGImageRef GrayImage = CGBitmapContextCreateImage(newContextGray);
UIImage *img= [UIImage imageWithCGImage:GrayImage scale:1.0 orientation:UIImageOrientationRight];
[self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:img waitUntilDone:NO];
free(baseAddressGray);
CGColorSpaceRelease(colorSpaceGray);
CGContextRelease(newContextGray);
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
All lies inside an autorelease pool which is drained afterwards.
The line which is th source for the crash is
CGContextRef newContextGray = CGBitmapContextCreate(baseAddressGray, width, height, 8, width, colorSpaceGray, kCGImageAlphaNone);
From my understanding there should be no memory problem here, because
CGColorSpaceRelease(colorSpaceGray);
CGContextRelease(newContextGray);
are released.
What am i doing wrong here, or what is missing?
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您没有在代码示例的第 4 行中释放
GrayImage。You are not releasing
GrayImagein line 4 of your code sample.