From:	"Ingo Ruhnke" <grumbel AT gmx DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: allegro bmp/pcx loading problems
Date:	23 Dec 1997 17:05:38 GMT
Organization:	Telemedia News Server
Lines:	105
Message-ID:	<01bd0f19$ed841fa0$0200a8c0@ingo>
References:	<349d836a DOT 0 AT news3 DOT escape DOT ca>
NNTP-Posting-Host:	gtso-m127-87.pool.mediaways.net
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Mark Phillips <bigphil AT solutions DOT mb DOT ca> schrieb im Beitrag
<349d836a DOT 0 AT news3 DOT escape DOT ca>...
> I have a program which uses allegro to load 6 bitmaps, all of size
> 77x105 and i want to keep writing them over top of each other to do
> some crude animation.  However, half of the time when I try to compile
> the program, the compiler gives me the error: "virtual memory
> exhausted" the other half of the time it compiles but i get a general
> protection fault after it has displayed 2 frames.  What am I doing
> wrong? here is the source if you're interested (I am just trying stuff
> out and so I just modified one of the allegro examples). oh yeah by
> the way, i accidentally overwrote allegro example #15 so if someone
> could just post ex15.c that would be great too.
> 

Here is a modified version of your example, this works on my machine.
Watch the comments for explanation

====Begin====
#include <stdlib.h>
#include <stdio.h>

#include <allegro.h>     
/*       ^         ^
  if allegro.h is in your Include directory */

#define MAX_IMAGES 4
/*      ^^^^^^^^^^
   it makes programming easier to define your constants */

   int main()
/* ^^^
  use int, because main must return int */
{
   int i;
   BITMAP *the_image[MAX_IMAGES];
   PALLETE the_pallete[MAX_IMAGES];

   char file_name[MAX_IMAGES][13] = {"run1.bmp",
                           "run2.bmp",
                           "run3.bmp",
                           "run4.bmp"};
  /* this gives you a more flexibility
  */

   allegro_init(); 
   /* you must call allegro_init() before any of the allegro functions!
      maybe this was the cause of the protection fault */
   install_keyboard(); 
   install_timer();
   /* this is needed for rest() */

   /* read in the bitmap files */
   for (i=0; i<MAX_IMAGES; ++i) {
     the_image[i] = load_bitmap(file_name[i], the_pallete[i]);

     if (the_image[i] == NULL) {
       allegro_exit();
       fprintf(stderr, "Error reading bitmap file \"%s\"\n", file_name[i]);
       /* stderr is better for debuging, RHIDE shows this message in a
special window */
       exit(1);
     }
   }

   if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0)!=0)
      exit(1);

   i = 0;
   while(!key[KEY_ESC]) {

     /* select the bitmap pallete */
     set_pallete(the_pallete[i]);

     /* blit the image onto the screen */
     blit(the_image[i], screen, 0, 0, 0, 0, 77, 105);

     rest(100);
  /* ^^^^^^^^^^ it waits for 100 milisecs */

     ++i;
     if (i==MAX_IMAGES)
       i=0;
   }

   for (i=0; i<MAX_IMAGES; i++)
   /* destroy the bitmap */
   destroy_bitmap(the_image[i]);

   readkey();

   allegro_exit(); 
 /* exit allegro before you exit your programm */

   exit(0);
}
=====End=====

Hope this helps

Ingo

-- 
Ingo Ruhnke
grumbel AT gmx DOT de
http://home.pages.de/~grumbel

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