From: "Attala" <atle DOT knutsen AT c2i DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Newbie problem
Date: Tue, 26 Jan 1999 20:04:05 +0100
Organization: Tele2 Norway Public Access
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

OK, I'm a real newbie at this C++ thing, but I really enjoy experimenting.
I started out in one of the examples that follow Allegro, and wanted to
write a program that displays a sprite and moves it. (Silly? Well, I told
you I was a newbie).
As you may have guessed it didn't work. I have included the source so that
maybe a kind soul could tell me what I should do to make it work.
The error message told me it exited because of signal from SIGSEV, (what is
that?)
I know I probably can find a good source code for moving sprites somewhere,
but I would really like to know what is wrong with my own.

Thanks

The source code:

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

#include "man.h"
#include "allegro.h"

DATAFILE *man_data;

int card, w, h;
int frame_number;

BITMAP *sprite_buffer;

int next;
int xpos;
int ypos;
int *file_attr;

void animate ()
{
 vsync(); vsync();
 blit (sprite_buffer, screen, 0, 0, 120, 80, 85, 85);
 clear (sprite_buffer);
 next = FALSE;
 if (key[KEY_SPACE]) next = TRUE;
 if (frame_number == 5) { frame_number = 0; } else { frame_number++; }
 if (xpos == 400) { xpos = 0; } else { xpos++; }
 if (ypos == 400) { ypos = 0; } else { ypos++; }
 }
 int main (int argc, char *argv[])
 {
 char datafile_name[256];
 replace_filename(datafile_name, argv[0], "man.dat", sizeof(datafile_name));

 allegro_init();
 install_keyboard();
 install_mouse();

 clear_keybuf();
 card = GFX_AUTODETECT;
 w = 800;
 h = 600;
 xpos = 0;
 ypos = 0;
 frame_number = 0;
 set_gfx_mode(card, w, h, 0, 0);
 man_data = load_datafile(datafile_name);
 sprite_buffer = create_bitmap (85, 85);
 clear (sprite_buffer);
       do
       {
       draw_sprite (sprite_buffer, man_data[frame_number].dat, xpos, ypos);
       animate();
       }
       while (next == FALSE);
 clear_keybuf(); rectfill(screen, 0, 190, 800, 600, 0);
 textout (screen, font, "It works!!", 1, 190, 15);
 unload_datafile(man_data);
 allegro_exit();
 readkey();
 return 0;
}