Testing if an application can open a specific type?

On Mac OS X,开发者_如何学Python how can I tell if a given application opens a specific type?

I have two UTIs that I'm interested in: public.text and public.image and I have a list of applications. I want to filter the list by those two types so I have a list of text viewers and a list of image viewers.

I've seen a related question on SO where it's possible to get a list of all the viewers for a particular document type. I could do that and get the intersection of the set, but I'd rather be able to ask each application individually.

Are there any Cocoa or Carbon calls for that?

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If you want a list of applications for a given document type, use LSCopyAllRoleHandlersForContentType.

If you want a list of document types for a specific application, open the application's Info.plist file and read the CFBundleDocumentTypes key.

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Launch Services is your friend. But I don't think there's any API which gets the UTIs supported by a given app, so I would suggest you to use what you already described, unfortunately.