Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!decwrl!pyramid!voder!apple!darin
From: darin@Apple.COM (Darin Adler)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Opening Working Directories
Message-ID: <8316@apple.Apple.Com>
Date: 15 Apr 88 07:35:07 GMT
References: <1988Apr13.115044.1591@mntgfx.mentor.com>
Reply-To: darin@apple.UUCP (Darin Adler)
Organization: Apple
Lines: 12
Keywords: vrefnum, directory, working

In article <1988Apr13.115044.1591@mntgfx.mentor.com> tomc@mntgfx.mentor.com (Tom Carstensen) writes:
> I can't just go closing that last one I opened, it may 
> have a file in it that I opened.

Once you have opened a file, the working directory no longer needs to be open.
HFS extracts the volume and directory information from the WDRefNum when the
Open call is made. You should always open working directories for as short a
time as possible, closing them after using them. As a matter of fact, you can
avoid opening working directories at all by using the PBH calls, which take
vRefNums and dirIDs to specify the directory and volume a file is in.
-- 
Darin Adler, Apple Computer                          AppleLink:Adler4
UUCP: {sun,voder,nsc,mtxinu,dual}!apple!darin  CSNET: darin@Apple.com