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From: brown-t@carp.cis.ohio-state.edu (ted croft brown)
Newsgroups: comp.sys.mac.programmer
Subject: "bus error" on GetPort
Message-ID: <85692@tut.cis.ohio-state.edu>
Date: 6 Nov 90 00:43:07 GMT
Sender: news@tut.cis.ohio-state.edu
Reply-To: ted croft brown <brown-t@cis.ohio-state.edu>
Distribution: usa
Organization: Ohio State University Computer and Information Science
Lines: 44

I have come across a probelem that has me REALLY confused.  I am programming
in THINK C 4.02.  I am in the process of writting my first Macintosh C
program (and it's been *educational*).

Anyway, in writting  Modal dialogs I do...

HandleMenuCommand()
{
	WindowPtr window

.
.
	GetPort(window);
	DoDialogRoutine();
	SetPort(window);
}

My code runs at home on my Mac SE (1 MB) but not on the
IIci (8MB, 80MBHD, Multifinder) here at the lab.
I ran the debugger, and I get a "bus error" at the 
	GetPort(window);  

I set a break point before the GetPort and right after it and it 
"bus error"`s  when I tell it to step to the GetPort.  The WindowPtr is 
not NULL (it consistently came up as AC40000 or something like that I 
can`t remember of the top of my head.  I use the same lines elsewhere and
the WindowPtr there came up as AC000000.


Any idea what might be wrong?  The code works fine on my SE.  I changed the
local window variable to a global gWindow and now it works perfectly on the
SE and the IIci.  It's not so much as it won't work, but I don't 
understand why it works one way and not the other.  The SAME code lines 
work elsewhere in the program on BOTH machines.  
I feel like I must have misunderstood something very basic here and would 
appreciate any help, thoughtfull insight, gratutious donations of money to help ease the mental anguish...


Sorry about wasting the bandwith..but I am CONFUSED.

I hope I have included enough information to get some usefull advise.
I will take help/advise any way I can get it (net/email/etc etc)

Ted Brown