Path: utzoo!attcan!lsuc!maccs!johns
From: johns@maccs.dcss.mcmaster.ca (Conan the Barbarian)
Newsgroups: comp.sys.atari.st
Subject: Re: v_opnwk() and v_opnvwk()
Keywords: metafiles, v_opnwk(), v_opnvwk()
Message-ID: <2669E353.24833@maccs.dcss.mcmaster.ca>
Date: 4 Jun 90 04:28:03 GMT
References: <2661949C.29268@maccs.dcss.mcmaster.ca>
Organization: McMaster University, Hamilton, Ontario, Canada
Lines: 29

In article <2661949C.29268@maccs.dcss.mcmaster.ca> johns@maccs.dcss.mcmaster.ca (Conan the Barbarian) writes:
>
>	I'm trying to do some GEM programming and I'm having a few problems.
>Does anyone else have any experience they can share in doing this?
>
>	This is what happens.  When I compile and run the program with 
>v_opnvwk(), the handle comes back zero and it crashes when I try to call
>v_clsvwk().  When I instead use v_opnwk(), it writes a 68 byte file to disk
>called GEMFILE.GEM and then crashes.  I get 2 bombs and it does not come
>back from that command.  
>

	I haven't figured it out yet, but after going through the code 
with a debugger for some hours, I found something that might or might not be
usefull.  

	For some reason or other, the code segment where it crashes, it 
seems to be looking for a pointer at f9ee which turns out to be NULL.  I
don't know why this is, but that is the reason for the bus error.

	What is at f9ee?  Is this something a user program should know? 
Somehow I doubt it.

	Thanks for any input.
-- 
John Schmitt
johns@maccs.dcss.mcmaster.ca
...!unet!utai!utgpu!maccs!johns
SCHMITTJ@SCIvax.McMaster.ca