加载带有ContentsOfFile的NSImage后如何查找文件类型 [英] How can i find the file type after loading NSImage withContentsOfFile

问题描述

我需要知道在我用 initWithContentsOfFie加载的文件中使用了哪种图像文件类型，因为我不想信任文件扩展名。

I need to know which image file type was used in the file i loaded with "initWithContentsOfFie" because i don't want to trust the file extension.

不幸的是我在NSImage和NSImageRep中找不到有关格式的任何信息，

Unfortunately i can't find anything about the format in NSImage and NSImageRep,

推荐答案

NSImage 不会保留该信息，因为它不再有用。您需要下拉至 CGImageSource 以获得所需的信息。

NSImage doesn't keep that information, because it's of no further use. You'll need to drop down to CGImageSource to get the info you want.

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