An example of using load

An example of using load_bitmap

ibse12

Member #22,686

March 2022

I downloaded allegro-4.4.3.1 and I am trying to load bmp file via load_bitmap():

#SelectExpand
 1#include <allegro.h>
 2#include <stdio.h>
 3int main(void)
 4{
 5   BITMAP* b = load_bitmap("/home/ibse/alexlogo.bmp", NULL);
 6   return 0;
 7}

but get Segmentation fault error. The backtrace is

#SelectExpand
  1Program terminated with signal SIGSEGV, Segmentation fault.
  2#0  0x00007f6b7472c204 in create_bitmap_ex (color_depth=8, width=128, height=128) at /home/ibse/Downloads/allegro-4.4.3.1/src/graphics.c:1042
  31042       if (system_driver->create_bitmap)
  4(gdb) bt
  5#0  0x00007f6b7472c204 in create_bitmap_ex (color_depth=8, width=128, height=128) at /home/ibse/Downloads/allegro-4.4.3.1/src/graphics.c:1042
  6#1  0x00007f6b7470a97b in load_bmp_pf (f=f@entry=0x55da0b8775a0, pal=0x7ffdb59aa5e0, pal@entry=0x0) at /home/ibse/Downloads/allegro-4.4.3.1/src/bmp.c:699
  7#2  0x00007f6b7470b58d in load_bmp (filename=<optimized out>, pal=0x0) at /home/ibse/Downloads/allegro-4.4.3.1/src/bmp.c:611
  8#3  0x00007f6b7474e241 in load_bitmap (filename=0x55da0b373bc2 "/home/ibse/alexlogo.bmp", pal=0x0) at /home/ibse/Downloads/allegro-4.4.3.1/src/readbmp.c:81
  9#4  0x000055da0b365e96 in main () at /home/ibse/Downloads/allegro-4.4.3.1/demos/skater/source/skater.c:5

Could anyone provide me with an example of how to use this routine correctly?

Edgar Reynaldo

Major Reynaldo

May 2007

system_driver is NULL, causing the SEGFAULT. You didn't call allegro_init.

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Mark Oates

Member #1,146

March 2001

You need to start with use allegro_init.

If you were using Allegro 5, you would use al_init. An,d because you are loading a PNG image you would need to al_init_image_addon().

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Chris Katko

Member #1,881

January 2002

Please stop using Allegro 4. It was made for DOS games. Like 20 years ago. In 99.99999% of all cases, you can "emulate" the feel of DOS in a proper Windows/Linux/Mac application.

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