On Dec 17, 2011, at 8:02 PM, C.W. Betts wrote:
> This is how I have my code set up: an Objective-C protocol that has a class
> function that returns an NSArray of UTIs that it can handle, and a member
> function that handles the file type:
>
> @protocol PcsxrFileHandle <NSObject>
>
> + (NSArray *)utisCanHandle;
> - (BOOL)handleFile:(NSString *)theFile;
>
> @end
>
> However, as my code is currently set up, the UTIs are used in a few special
> cases and are not called in determining what UTI opens what file. The code is
> set up like so:
>
> - (BOOL)application:(NSApplication *)theApplication openFile:(NSString
> *)filename
> {
> NSString *utiFile = [[NSWorkspace sharedWorkspace] typeOfFile:filename
> error:nil];
> NSObject<PcsxrFileHandle> *hand = nil;
> BOOL isHandled = NO;
> if(UTTypeEqual(CFSTR("com.codeplex.pcsxr.plugin"),
> (CFStringRef)utiFile)) {
> hand = [[PcsxrPluginHandler alloc] init];
> isHandled = [hand handleFile:filename];
> } else if(UTTypeEqual(CFSTR("com.codeplex.pcsxr.memcard"),
> (CFStringRef)utiFile)) {
> hand = [[PcsxrMemCardHandler alloc] init];
> isHandled = [hand handleFile:filename];
> } else if(UTTypeEqual(CFSTR("com.codeplex.pcsxr.freeze"),
> (CFStringRef)utiFile)) {
> hand = [[PcsxrFreezeStateHandler alloc] init];
> isHandled = [hand handleFile:filename];
> } else if(UTTypeEqual(CFSTR("com.alcohol-soft.mdfdisc"),
> (CFStringRef)utiFile) || UTTypeEqual(CFSTR("com.apple.disk-image-ndif"),
> (CFStringRef)utiFile) || UTTypeEqual(CFSTR("public.iso-image"),
> (CFStringRef)utiFile) || UTTypeEqual(CFSTR("com.codeplex.pcsxr.cuefile"),
> (CFStringRef)utiFile)) {
> hand = [[PcsxrDiscHandler alloc] init];
> isHandled = [hand handleFile:HandleBinCue(filename)];
> }
> if (hand) [hand release];
> return isHandled;
> }
>
> The PcsxrPluginHandler, PcsxrMemCardHandler, PcsxrFreezeStateHandler, and
> PcsxrDiscHandler all implement the PcsxrFileHandle protocol.
> Is there a way to put classes into some sort of array to go through and check
> if the UTI of a file matches up to any of the UTIs that the class can handle?
Chris already answered your main question, but I’d just like to add that it’s
probably better to use UTTypeConformsTo() instead of UTTypeEqual() to test
UTIs. This way, in the hypothetical case that you encounter a subtype of one of
those types, things will still work, whereas with the code above, it won’t.
Also, something like ‘supportedTypes’ or ‘supportedUTIs’ would probably be a
clearer name than ‘utisCanHandle’.
Charles_______________________________________________
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