From: eglebbk AT dds DOT nl (Evert Glebbeek)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problems with Allegro
Date: Mon, 31 Jul 2000 00:06:30 GMT
Organization: Physics student, University of Amsterdam
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Newsgroup: comp.os.msdos.djgpp
 From: "Carlos Alfredo Barahona FrenÁNdez" <CARLOSABF AT terra DOT es>
 On Sun, 30 Jul 2000 21:51:08 GMT

>Hi, my name is Carlos Barahona,i´m working in my final career´s project and
>i´m using DJGPP with ALLEGRO libraries, and i´m in a trouble:
Which versions?
>I´m using a Pentium 200 MMX with a 1M video card,and i´m working on MS-DOS,
>and when i compile and run an Allegro´s program i have a Segmentation
>Fault.It happens inside Allegro code, always in set_gfx_mode, i have
>followed the trace and i when i arrive to 88th line in vga.c file, it
>crashes.
Only for mode 13h, or also for text mode?
>
>Here is a piece of my code:
Post the smallest sampleprogram that reproduces the error instead.
That way, other people can run it and try to reproduce your problem.
>void main(void){
should be int main
>int eleccion,color=0;
>PALETTE defecto;
>allegro_init();
>eleccion='0'&0xFF;
>
>while((eleccion=='1'&0xFF) || (eleccion=='0'&0xFF))
>  {
>   install_keyboard();
>   printf("\n\nVAMOS A CAMBIAR EL MODO GRµFICO ...\n\n");
>   printf("\nQue modo desea poner:\n\t\t0->Modo Texto\n\t\t1->Modo
>13\n\t\tCualquiera->Salir\n\t\t");
>   eleccion=readkey();
>   if((eleccion & 0xff)=='0')
>        modo_texto();
>     else if((eleccion & 0xff)=='1')
>             modo_13();
>   else
>     {
>  modo_texto();
>  allegro_exit();
>     }
>  }
>}
>END_OF_MAIN();
>void modo_texto(void)
>{
>int error=0;
>error=set_gfx_mode(GFX_TEXT,0,0,0,0);
>if(error==-1)
>  {
>  printf("\nNO SE HA PODIDO PONER EL MODO TEXTO\n");
>  remove_keyboard();
>  }
>else
>    {
>    remove_keyboard();
>    printf("\nSE HA PUESTO CON EXITO EL MODO TEXTO\n");
>    }
>getch();
>clrscr();
>}
>
>void modo_13(void)
>{
>int error=0,onda=0,opval=0,i=0,j=0;
>PALETTE defecto;
>error=set_gfx_mode(GFX_VGA,320,200,0,0);//Here it crashes
Looks fine to me.
>      r.x.ax = 0x13;
>      __dpmi_int(0x10, &r);//Here it crashes
Strange to say the least. It sounds to me like you're dealing with
corrupted memory, but without seeing all of your code, I can't say for
sure.
>Sorry for my bad English(i have forgotten it as you can read)
Quite alright. Feel free to post in Spanish if you prefer to do so.
Most posts in non-english languages get answered anyway.

Regards,

Evert Glebbeek