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Get QuickLook preview for file

Is there a way to get a preview image for a file?

I am looking for something like this:

NSImage *image = [QuickLookPreviewer quickLookPreviewForFile:path];

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2 answers

See the QLThumbnailRequestdocs: https://developer.apple.com/library/mac/#documentation/UserExperience/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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In Swift, I got something like this (unpacking should be replaced):

let options = [
  kQLThumbnailOptionIconModeKey: false
]

let ref = QLThumbnailCreate(
  kCFAllocatorDefault,
  url as NSURL,
  CGSize(width: 150, height: 150),
  options as CFDictionary
)

let thumbnail = ref!.takeRetainedValue()
let cgImageRef = QLThumbnailCopyImage(thumbnail)
let cgImage = cgImageRef!.takeRetainedValue()
let image = NSImage(cgImage: cgImage, size: CGSize(width: cgImage.width, height: cgImage.height))
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