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From: stevec@Apple.COM (Steve Christensen)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Help With File Manager
Message-ID: <48193@apple.Apple.COM>
Date: 17 Jan 91 02:13:42 GMT
References: <3087.2794333E@blkcat.fidonet.org>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 36

Ken.Knight@f421.n109.z1.fidonet.org (Ken Knight) writes:
>lasky@iris.ucdavis.EDU (Ty Lasky) Asks:
>>1.  If I am using SFGetFile to allow the user to select a file, then I
>>believe I have the name and the volume reference number (or is it the
>>working directory ID?). Now, how do I get the volume name?
> 
>SFGetFile() gives you a volume reference number. What you then need is
>the working directory ID which you can get with a call to GetWDInfo().
>Like this:
>  err = GetWDInfo(0,&(reply.vRefNum),&dirID,&procID);
>  if (err == noErr) {
>     err = HOpen(reply.vRefNum,dirId,reply.fName,permission,refNum);
>     .... /* Permission is the read/write access to want for the file. */
>     .... /* do you thing. */
>  }

Actually SFGetFile() returns a working directory reference number.  To get
the volume reference number, you can either call

	err = GetVRefNum(reply.vRefNum,&volumeRefNum);	[high-level only]

or

	pb.ioNamePtr = nil;
	pb.ioVRefNum = reply.vRefNum;	// working directory refNum
	pb.ioVolIndex = 0;
	err = PBHGetVInfo(&pb,false);
	volumeRefNum = pb.ioVRefNum;	// volume reference number

steve

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Steve Christensen	|  Apple Computer, Inc.		|  Disclaimer:
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  stevec@apple.com	|  Cupertino, CA  95014		|   a lie...or not.