Description

This article is from the Mac Programming FAQ, by Jon Watte h+@austin.metrowerks.com with numerous contributions by others.

4.9) How do I find the name of a folder for which I only know the dirID and vRefNum? (Files - Mac Programming)

You call (surprise!) PBGetCatInfo! Make ioNamePtr point to an empty
string (but NOT NULL) of length 63 (like, an Str63) and ioFDirIndex
negative (-1 is a given winner) - this makes PBGetCatInfo return
information about the vRefNum/dirID folder instead of the file/folder
specified by vRefNum, parID and name.

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