Path: utzoo!attcan!uunet!maverick.ksu.ksu.edu!ux1.cso.uiuc.edu!resnick
From: resnick@cogsci.uiuc.edu (Pete Resnick)
Newsgroups: comp.sys.mac.programmer
Subject: Re: popup hiermenu in cdev bombs later...
Message-ID: <1990Oct29.003508.8747@ux1.cso.uiuc.edu>
Date: 29 Oct 90 00:35:08 GMT
References: <1990Oct28.153715.29247@digibd.com>
Sender: news@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 35

merlyn@digibd.com (Brian Westley (Merlyn LeRoy)) writes:

>I'm updating ZoomBar to version 1.6, but I've noticed a bug in the cdev
>part that I can't seem to fix: if you pop up the hiermenu, then switch to
>another cdev, then back to ZoomBar, the popup menu will eventually cause
>a crash.  It seems to think that the resources for the menu are still loaded
>and valid, and chokes on invalid data.  I DeleteMenu() the popup stuff, and
>ReleaseResource() the handles, but that doesn't seem to make any difference.
>I check if GetMenu() is returning a null handle (which it isn't, even before
>it crashes).  I'm using Think C 4.0.3, using their object-oriented cdev
>starter.  Any help will be much appreciated.

I had exactly the same problems. I did the following which seems to
have cured it:

1. Set the "System Heap" attribute on the menu if you are reading it
in from a resouce. I happen to have also check "Preload", but that
depends on what you do.

2. Lock the MenuHandle before calling PopUpMenuSelect. I don't know
why this should help in the least. PopUpMenuSelect should know enough
to not move memory while the handle is unlocked, but I have found
circumstantial evidence to the contrary.

I have tested neither of these moves to see why exactly they work. I
just know that my cdev no longer crashes. Anyone seen any method behind
this madness?

pr
--
Pete Resnick             (...so what is a mojo, and why would one be rising?)
Graduate assistant - Philosophy Department, Gregory Hall, UIUC
System manager - Cognitive Science Group, Beckman Institute, UIUC
Internet/ARPAnet/EDUnet  : resnick@cogsci.uiuc.edu
BITNET (if no other way) : FREE0285@UIUCVMD