Path: utzoo!attcan!uunet!husc6!think!ames!amdahl!nsc!voder!apple!lsr
From: lsr@Apple.COM (Larry Rosenstein)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Reading a resource from an already open file
Message-ID: <16730@apple.Apple.COM>
Date: 7 Sep 88 15:46:29 GMT
References: <29389@bbn.COM>
Reply-To: lsr@apple.com.UUCP (Larry Rosenstein)
Organization: Advanced Technology Group, Apple Computer
Lines: 24

In article <29389@bbn.COM> levin@BBN.COM (Joel B Levin) writes:
>I would like to read a resource out of the Desktop file.
>Unfortunately, under multifinder it is always open and OpenResFile
>always returns error -49.  (This is not a problem if I do this in an

You can open it read-only using OpenRFPerm (Inside Mac volume 4).  This is
not available on 64K ROM machines, however.

The danger is that the Finder will still have the Desktop file open
read-write and therefore there are 2 copies of the resource map in memory.
If the Finder changes the desktop file (which changes the location of
resources on the disk) then your copy of the resource map will be invalid.

You can minimize the danger by opening the file only when you need it.
Unfortunately the Desktop file can be large and opening it can take a couple
of seconds.



		 Larry Rosenstein,  Object Specialist
 Apple Computer, Inc.  20525 Mariani Ave, MS 46-B  Cupertino, CA 95014
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