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From: olson@harvard.UUCP
Newsgroups: net.micro.mac
Subject: Re: Directory name from DirID?
Message-ID: <20@harvard.UUCP>
Date: Mon, 16-Jun-86 07:23:33 EDT
Article-I.D.: harvard.20
Posted: Mon Jun 16 07:23:33 1986
Date-Received: Tue, 17-Jun-86 23:45:38 EDT
References: <157@zyx.UUCP> <158@zyx.UUCP>
Sender: news@harvard.UUCP
Reply-To: olson@endor.UUCP (Eric Olson)
Organization: Aiken Comp Lab, Harvard
Lines: 36
Keywords: HFS

In article <158@zyx.UUCP> grzm@zyx.UUCP (Gunnar Blomberg) writes:
>In article <157@zyx.UUCP> grzm@zyx.UUCP (me) writes:
>>
>>	Is there a way to get the directory name from the directory id,
>>without searching through the directory tree or going to disk yourself?
>
>	Yes, well, I just found out how to do it (after some serious
>macsbugging...).  It seems that if you pass -1 as the FDirIndex to
>_GetCatInfo it will ignore the filename you gave it and give back info
>about the directory (including the name, of course...).  Is this documented
>anywhere?
>	Sorry to have bothered you all, but I was rather desperate (not
>to mention tired...).
>-- 
>Gunnar Blomberg, ZYX, +46 8 653205, ...mcvax!enea!zyx!grzm

Unfortunately, this only works if you are referencing the directory with
a WDRefNum (essentially, a VRefNum-like number that refers to a volume AND
a directory).  That is to say:

	fname[0]=0;
	pb.ioCompletion=NIL;
	pb.ioNamePtr=fname;
	pb.ioVRefNum= <a WDRefNum, such as returned by SFGetFile>;
	pb.ioFDirIndex=-1;
	pb.ioDirID=0;

	PBGetCatInfo(&pb,FALSE);

will stuff the name of the directory referred to by the WD/VRefNum into
fname, it's DirID into ioDirID, and it's parent directory's DirID into
ioParID.

It will not, however, give you a directory's name from it's DirID.

-Eric