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From: raylau@dasys1.UUCP (Raymond Lau)
Newsgroups: comp.sys.mac
Subject: Re: Getting a vRefNum from a DirID
Message-ID: <1803@dasys1.UUCP>
Date: Sun, 25-Oct-87 12:08:17 EST
Article-I.D.: dasys1.1803
Posted: Sun Oct 25 12:08:17 1987
Date-Received: Wed, 28-Oct-87 00:47:23 EST
References: <1006@mntgfx.MENTOR.COM>
Organization: The Big Electric Cat
Lines: 13
Summary: getting a WD from vol/dirID

In article <1006@mntgfx.MENTOR.COM>, tomc@mntgfx.MENTOR.COM (Tom Carstensen) writes:
> Put simply, how do you get a volume reference number
> (like that return from a SFGetFile), from a directory
> ID?  

The vRefNum returned by SFGetFile may actually be a volume ref num or it
may be a working directory reference number.  WD's were created so that pre-
HFS applications can refer to folders w/one number.
To create a WD given a vRefNum and a DirID, use PBOpenWD...and the Proc ID or
'ERIK' so that the Finder will dispose of unneeded WDs.  (There is a limit
of 40 WDs at any given time on current systems)
To refer to the root of a volume (DirID}i = 2), just use the volume
reference number.