Path: utzoo!attcan!utgpu!watmath!iuvax!purdue!decwrl!wam.UMD.EDU!russotto
From: russotto@wam.UMD.EDU
Newsgroups: comp.sys.mac.programmer
Subject: Re: HFS Help
Message-ID: <8909210203.AA11172@cscwam.UMD.EDU>
Date: 21 Sep 89 02:03:16 GMT
References: <12562@orstcs.CS.ORST.EDU>
Organization: University of Maryland, College Park
Lines: 21

In article <12562@orstcs.CS.ORST.EDU> borcelf@jacobs.cs.orst.edu (Fernando Borcel) writes:
>Is it [vrefnum] a reliable way to find a file?
>
>Thanks a lot.

No.  the vrefnum is dynamic, and are assigned starting at '-2' and in
descending order.  Use the volume name, directory ID, and file name as the
most reliable way of finding a file across launches of your application.
 For the duration of an application, the
vrefnum, dirID, and file name is safe (if the file is open, the refnum
is enough).  Having just the wdRefNum and file name is probably ok too,
but I don't trust that.




-- 
DISCLAIMER:  Not only does the University not share my opinions, they don't
                         want me sharing my opinions.
	                "This 'Pnews', what does it do?
 Matthew T. Russotto	  russotto@eng.umd.edu	     russotto@wam.umd.edu