Re: [AD] Bug when attempting to set GFX_AUTODETECT_WINDOWED in the DOS version of Allegro.

[Andrei Ellman <ae-a-alleg@xxxxxxxxxx>]

Michal Molhanec wrote:
> Andrei Ellman napsal(a):
>
> > When I run the following line from a program compiled with the DOS 
> > version of Allegro 4.2 (compiled with DJGPP):
> >
> > set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);      the 
> > program has been known to crash with a SIGILL error (illegal 
> > instruction). My guess is that because on DOS there are no windowed 
> > modes, the pointer in some vtable or other is set to a dodgy address.
> >
> > If there are no windowed modes available on the platform, then the 
> > set_gfx_mode function should just return gracefully with it's usual 
> > failiure-code.
>
>
> It behaves exactly like that, either you are doing something wrong or 
> the bug is elsewhere (tested with latest SVN 4.2)


Oops. It turned out that there was something wrong in my code - I forgot 
to check the return value of set_gfx_mode() and the app continued on 
regardless. My bad. :-[


AE.