Re: Problem with C function pointers

[skibochka@yahoo.com (Andrew Skiba)]

After I wrote all answers, I saw the whole message became off-topic.
I'm sorry for that, and I'm ready to continue the duscussion in any
other place, if there are further questions.

> Well, I have learned from many years of posting here never to assume
> the "obvious", but instead to ask for precise details. Often the
> problem is that the poster is assuming something they shouldn't (which
> was the case here :).
I would never have such problem with C++, I mean, I would immediately
know what the problem is, but with Ada I tried to find a black cat in
a dark room, when it wasn't there :)

> > > Have you tried running under gdb, and examining "thiz"?
> > No, I printed it instead :-) It was "null", as you said.
> 
> Learn gdb; it's much better than Put_Line.
I use it for a very long time, may be you heard, that it works for C,
too :) The problem is, DirectFB has issues with debugging on the same
monitor, because it OBVIOUSLY (:-) has exclusive control of the video
card. Usually they are debugging via ssh, or a com-port. For simple
cases put_line isn't that bad.

> Hmm. So it _doesn't_ run under X Windows?
Did I say that? Of course, it runs under X Windows. Try tuxrunner game
for an example what it is. And, there is http://directfb.org/ to find
other cute projects.

> How big is it, compared to X Windows?
Very small. That's the point, after all :-) It does not have to do
much, linux kernel has device /dev/fb (if you configure it right), so
the library only makes memcopy to it. Well, it's oversimplified, but
the principle is right, I hope.

> Now we have a third target for GtkAda :).
Sorry, I did not understand that joke. If you meant to run GTK on
DirectFB, that's done already, as well as mplayer, SDL, FreeVO and so
on. I need it for a project, similar to FreeVO.

Regards,
Andrew Skiba.