有什么方法可以快速查看文件的预览图像吗？
我正在寻找这样的东西：
NSImage *image = [QuickLookPreviewer quickLookPreviewForFile:path];
See QLThumbnailRequest在文档中：https://developer.apple.com/library/mac/#documentation/User Experience/Reference/QLThumbnailRequest_Ref/Reference/reference.html
NSURL *path = aFileUrl;
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:(NSString *)kQLThumbnailOptionIconModeKey];
CGImageRef ref = QLThumbnailImageCreate(kCFAllocatorDefault, (CFURLRef)path, CGSizeMake(600, 800 /* Or whatever size you want */), (CFDictionaryRef)options);
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