How to open an HFS+ file by file ID?

Question

Given an HFS+/HFS volume and the catalog node ID (CNID) of a file it should be possible to open that file, and technote 1150 describes the algorithm for doing just that, yet nowhere can I find the corresponding API call.

As far as I can tell, the whole API requires either the file's name or its parent catalog node ID.

What gives?

Answer 1

Have you seen the volfs? http://developer.apple.com/qa/qa2001/qa1113.html