NSURL category method to get the UTI of a file

MCURLExtensions.m

@implementation NSURL (MCExtensions)

-(NSString *)UTI
{
    FSRef fileRef;
    Boolean isDirectory;
    NSString *utiString = nil;
    
    if ( !self.isFileURL ) return nil;
    
    if (FSPathMakeRef((const UInt8 *)[self.path fileSystemRepresentation], &fileRef, &isDirectory) == noErr) {
        CFDictionaryRef values = NULL;
        CFStringRef attrs[1] = { kLSItemContentType };
        CFArrayRef attrNames = CFArrayCreate(NULL, (const void **)attrs, 1, NULL);
        
        if (LSCopyItemAttributes(&fileRef, kLSRolesViewer, attrNames, &values) == noErr) {
            if (values != NULL) {
                CFTypeRef uti = CFDictionaryGetValue(values, kLSItemContentType);
                if (uti != NULL) {
                    utiString = [[(id)uti copy] autorelease];
                }                
                CFRelease(values);
            }
        }
        CFRelease(attrNames);
    }
    
    return utiString;
}


@end

After writing this, I realized that NSWorkspace already has a method to get the UTI (typeOfFile:error:). I'll leave this here in case it is useful just to see how you can use the C APIs to work with UTIs.