How to find multiple apps with same bundle identifier?

Question

Does anyone know of a good way to find (in the filesystem) every app with a given bundle identifier? NSWorkspace and Launch Services let you look for an app by bundle identifier, but only return a single result. I suspect Spotlight (NSMetadataQuery) might help, but I'm a bit unclear on its API, so I'm not sure if there's an appropriate key.

There's the command-line lsregister tool (inside LaunchServices.framework), which can be told to (re)register everything on the system and then dump a report on everything it knows about. Relying on that seems less than ideal, since it's undocumented and parsing its output could be a pain.

(Background: I'm building an app for game modding, and want to provide UI for quickly choosing from a short list of supported games rather than requiring the user to dig through the whole filesystem in an Open panel. However, I expect it's quite likely for a user to have multiple copies of a game installed: release and beta, extra copies for modding, etc.)

Answer 1

You want the kMDItemCFBundleIdentifier Spotlight/metadata key.

pierre$39> mdfind "kMDItemCFBundleIdentifier == 'org.videolan.vlc'"
/Applications/VLC.app
/Applications/vlc-0.8.6c/VLC.app

From there it should just be a matter of making the right calls to the file metadata APIs (pick your poison, Carbon or Cocoa). Interestingly enough, this key is not very well documented: it is not in File Metadata Attributes Reference, though it is in MDItem Reference.

Once again, it goes to show that game modding tools raise use cases few other kind of apps raise, and that sometimes aren't very well served by Apple… </soapbox>

Addendum: once you have your list, in my opinion the best way to present it to the user would be to list the version (kMDItemVersion) of each item you found; you might also show the path, but the version is likely going to be the most useful thing to the user (after all, he likely keeps different instances in order to have specific versions).