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From: bdenh@caen.engin.umich.edu (Brian J Denheyer)
Newsgroups: comp.sys.atari.st
Subject: Using user-define AES objects
Keywords: AES GEM user-defined
Message-ID: <436aa488.14e01@elwood.engin.umich.edu>
Date: 24 May 89 17:28:00 GMT
Distribution: usa
Organization: U of M Engineering, Ann Arbor, Mich.
Lines: 23

Here's a question to the GEM/AES experts out there.  I'm trying
to use the object type G_USERDEF which is associated with the 
following structure (MWC 3.0) :

typedef struct {
  long ub_code;
  long ub_parm;
} USERBLK;

I've constructed the tree which incorporates a user-defined object
and I have the object calling some VDI routines when I execute
objc_draw on the tree. So in effect it works.

My question (finally) is : how do I get a hold of ub_parm which is
supposedly a pointer to the parameter you want passed ?  It would be
very useful to me if I could have a pointer passed to the routine pointed
to by ub_code.  I can't figure out how this works.

Thanks in advance

Brian J. Denheyer

#include <help.h>