NSSavePanel，CGImageDestinationFinalize和OS X沙箱 [英] NSSavePanel, CGImageDestinationFinalize and OS X sandbox
问题描述
我正在使用NSSavePanel让用户选择要保存到我的应用程序中的图像。一切正常，直到我启用了应用程序沙箱和授权。选择一个已经存在的文件会出现问题。我的代码是这样的：
I'm using NSSavePanel to let user select image to save to in my app. Everything worked fine until I enabled app sandboxing and entitlements. The problem occurs with selection of an already existing file. My code is like this:
//创建指向文件目标的URL和CGImageDestination保存。
CGImageDestinationRef imageDestination = CGImageDestinationCreateWithURL（（CFURLRef）[savePanel URL]，（CFStringRef）newUTType，1，NULL）;
CGImageDestinationAddImage（imageDestination，cgimage，（CFDictionaryRef）metaData）;
const bool结果= CGImageDestinationFinalize（imageDestination）;
// Create a URL to our file destination and a CGImageDestination to save to. CGImageDestinationRef imageDestination = CGImageDestinationCreateWithURL((CFURLRef)[savePanel URL], (CFStringRef)newUTType, 1, NULL); CGImageDestinationAddImage(imageDestination, cgimage, (CFDictionaryRef)metaData); const bool result = CGImageDestinationFinalize(imageDestination);
在选择新文件保存图像时可以使用，但是当我选择现有文件时会创建奇怪的命名文件除了现有文件，而且无法覆盖目标网址的内容。更糟糕的是，我没有得到任何回报，也无法检测到故障。这是CoreGraphics还是我的代码中的错误？
It works when selecting new file to save the image, but when I select existing file it creates strange named file besides existing file and fails to overwrite the contents of destination url. And even worse, I get no error in return and cannot detect the failure. Is this a bug in CoreGraphics or in my code? Is there any workaround for this issue?
推荐答案
最后，我发现核心图形调用的组合覆盖了已在其中运行的现有图像。沙盒环境： CGDataConsumerCreateWithURL ，后跟 CGImageDestinationCreateWithDataConsumer 。因此，启用了沙箱的 CGImageDestinationCreateWithURL 似乎已损坏（至少在 OS X Lion 10.7.1 中）。
Finally I have discovered combination of core graphics calls to overwrite an already existing image working in sandboxed environment: CGDataConsumerCreateWithURL followed by CGImageDestinationCreateWithDataConsumer. So it seems CGImageDestinationCreateWithURL is broken (at least in OS X Lion 10.7.1) with sandbox enabled.
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