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From: Ken Thomas <kst@ecs.soton.ac.uk>
Subject: Re: OpenGl and ADA95 by Aonix
Date: 1998/02/16
Message-ID: <34E80377.41C67EA6@ecs.soton.ac.uk>#1/1
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Date: 1998-02-16T00:00:00+00:00
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Stephen Leake wrote:
> 
> Colson Eric wrote:
> > I've seen in the package  glut.ads for Gnat that the specification for
> > GlutInit is:
> >
> >        procedure glutInit (argcp : access Integer;
> >                            argv  : access Interfaces.C.Strings.Chars_Ptr);
> >        pragma Import (C, glutInit, "glutInit", "glutInit");
> >
> > With Aonix, the problem is the parameters look like not to be recognize. I
> > obtain at the moment of the execution the following message :
> > "exception raised : constraint error
> > exception message : access error"
> >
> 
> This means that you are passing a null pointer. If you post the code
> that calls glutInit, maybe we can help more.
> 
> --
> - Stephe

You might also check that the prototype in C is
    void glutInit(int argcp*, char ***argv)
and not
    int glut(...

Ada cannot ignore the result of a function call as in C.

Ken
-- 
Dr K.S. Thomas
Department of Electronics and Computer Science
University of Southampton
Highfield
Southampton SO17 1BJ
United Kingdom

Telephone : (+44) 01703 592170
Fax :       (+44) 01703 593903

email: kst@ecs.soton.ac.uk