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Article #6906OpenResFile behavior
From: lsr
Date: Thu, 21 Aug 1986 23:26
Date: Thu, 21 Aug 1986 23:26
21 lines
1279 bytes
1279 bytes
Recently there was a message concerning funny behavior in OpenResFile. I
lost the original message, but the answer is described in Tech Note #78.
On the 64K ROM, there was a patch to OpenResFile that checks to see if the
string being passed is the name of a printer, by inspecting the high bits of
the pointer to the file name. If the high bits indicate a resource, then
the patch will call RecoverHandle on the alleged handle, which will crash if
the pointer is not to a resource..
The fix is to mask off the high-order byte of the address you pass to
OpenResFile, to ensure that it is not flagged as a resource.
--
Larry Rosenstein
Object Specialist
Apple Computer
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Technical Details
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!lll-crg!nike!ucbcad!ucbvax!decvax!decwrl!sun!idi!apple!lsr From: lsr@apple.UUCP Newsgroups: net.micro.mac Subject: OpenResFile behavior Message-ID: <143@apple.UUCP> Date: Thu, 21-Aug-86 19:26:44 EDT Article-I.D.: apple.143 Posted: Thu Aug 21 19:26:44 1986 Date-Received: Sat, 23-Aug-86 22:02:34 EDT Organization: Advanced Development Group, Apple Computer Lines: 21 Keywords: OpenResFile, bug