Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!brutus.cs.uiuc.edu!apple!oracle!news
From: omullarn@oracle.oracle.com (Oliver Mullarney)
Newsgroups: comp.sys.mac.programmer
Subject: Re: HLock
Message-ID: <1989Dec19.001739.17771@oracle.com>
Date: 19 Dec 89 00:17:39 GMT
References: <3331@hub.UUCP> <9313@hoptoad.uucp>
Reply-To: omullarn@oracle.com (Oliver Mullarney)
Organization: Oracle Corporation, Belmont, CA
Lines: 21

In article <9313@hoptoad.uucp> tim@hoptoad.UUCP (Tim Maroney) writes:
>
>Rect r;
>r = (*theControl)->contrlRect;
>RectRgn(myRgn, &r);
>
as a way of avoiding using HLock and HUnlock. Not in this case. What you
are handing to RectRgn is a pointer into a relocatable block. It may look
like a legitimate pointer, but it is not, so this *can* crap out.

HLock and HUnlock are probably the best solution in this case, or the
HGetState and HSetState calls. 

| Oliver Mullarney     |  "I have knowledge of Digital Watches,  and soon I   |
| Oracle Corporation   |   shall have knowledge of Video Cassette Recorders"  |
| omullarn@oracle.com  |                                      Time Bandits    |
 --------------- "Universally acknowledged to work just fine" ----------------
| Oliver Mullarney     |  "I have knowledge of Digital Watches,  and soon I   |
| Oracle Corporation   |   shall have knowledge of Video Cassette Recorders"  |
| omullarn@oracle.com  |                                      Time Bandits    |
 --------------- "Universally acknowledged to work just fine" ----------------