How to find Bundle Identifier from known PID?

Question

I have the pid (process identifier) of an arbitrary running process. How can I find the bundle identifier (if any) of the associated application?

Answer 1

I've found an answer which works on 10.6 only:

[[NSRunningApplication runningApplicationWithProcessIdentifier:pid] bundleIdentifier]

Answer 2

Here's a way that works in 10.2 and later: First call GetProcessForPID to turn the pid into a ProcessSerialNumber. Then call ProcessInformationCopyDictionary to get the bundle ID.