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From: time@ice.com (Tim Endres)
Newsgroups: comp.sys.mac.programmer
Subject: Re: I want to write Add1ResMenu()
Date: Thu, 18 Apr 91 14:41:35 EST
Organization: ICE Engineering, Inc.
Message-ID: <1CE00001.ddgajp2@tbomb.ice.com>
Reply-To: time@ice.com
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In article <1991Apr18.002228.25647@umbc3.umbc.edu>, cs483106@umbc5.umbc.edu (cs483106) writes:
> I don't know if it's sanctioned or not, but I have a simple technique for
> finding out if a resource file is open or not. Simply do an OpenRF on the file
> in question. If the resource file is open, then the Resource manager will have
> write access to the file, and you will not be able to open it(you will get
> an error). If the file isn't open, you can get access. Just remember to do
> an FSClose if you do get access, and you're all set.
> (note that this could fail when trying to open something that's on a server.
>  If another machine, also attached to the server, were to do an OpenResFile
>  in between your OpenRF and your OpenResFile, you could think the file was
>  available, but then get an error when you try to open it. No big thing, in
>  most cases.)


This could be dangerous, as a file opened as READONLY might succeed.

It is simpler to do a PBGetFInfo(). The ioFlAttrib
flags will tell if either or both forks are open and which.

tim.

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