Check NSURL for UTI / file type

macos, objective-c, video, xcode

Solution

This should work:

NSWorkspace *workspace = [NSWorkspace sharedWorkspace];

for (NSURL *url in urls) {
    NSString *type;
    NSError *error;
    if ([url getResourceValue:&type forKey:NSURLTypeIdentifierKey error:&error]) {
        if ([workspace type:type conformsToType:@"public.movie"]) {
            // the URL points to a movie; do stuff here
        }
    } else {
        // handle error
    }
}

(You can also use `UTTypeConformsTo()` instead of the `NSWorkspace` method.)

Problem

I'm building an app that allows users to drop videos onto it. Given a list of dropped NSURL*s how do I make sure each one conforms to the `public.movie` UTI type? If I had an `NSOpenPanel`, I would just use `openPanel.allowedFileTypes = @[@"public.movie"];` and Cocoa would take care of it for me. Thanks in advance!

Original source

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