Crash because of data file

no-reply@allegro.cc (yipster) — Fri, 28 Apr 2006 01:25:21 +0000

I had a whole bunch of images and midi files, and decided to try using a data file. It's all fine and dandy when compiling, but crashes when it tries to 'draw_sprite()'.

I've commented what I think is relevant. As the code shown here was done in the heat of the moment, and I just did whatever popped into my brain for x's and o's. So any tips on fixing it up or efficiency is welcome.
[Note: I've attached everything in a rar]

Here is a snippet: (max post size is 64k so I just cut and pasted the relevant stuff)

1#include 
2 
3DATAFILE *data;
4BITMAP *x_pic;
5 
6 
7data = load_datafile ("game.dat");
8    
9x_pic = (BITMAP *)data[0].dat;
10 
11else if(key[KEY_ENTER] && squares[location] != 1 && squares[location] != 2)
12               {
13                if(turn == 1)
14                        {
15                         draw_sprite( screen, x_pic, x, y); 
16                         squares[location] = turn;
17                         count++;
18                        }
19                else if(turn == 2)
20                        {
21                         draw_sprite( screen, o_pic, x, y);
22                         squares[location] = turn;
23                         count++;
24                         }
25                
26                  check_win();                     
27               }

no-reply@allegro.cc (Michael Faerber) — Fri, 28 Apr 2006 01:28:20 +0000

Have you checked if x_pic is zero? Have you properly initialized everything?

no-reply@allegro.cc (yipster) — Fri, 28 Apr 2006 01:47:14 +0000

Well I've added

DATAFILE *data = NULL;
BITMAP *x_pic = NULL;

Still crashes when it tries to draw_sprite().

no-reply@allegro.cc (BAF) — Fri, 28 Apr 2006 02:36:10 +0000

Did oyu make sure data isn't null?

no-reply@allegro.cc (Kitty Cat) — Fri, 28 Apr 2006 02:38:46 +0000

Are you sure the sprite is the first object in the datafile?

no-reply@allegro.cc (yipster) — Fri, 28 Apr 2006 02:58:46 +0000

BAF said:

Did oyu make sure data isn't null?

Not sure what you mean. I've intialized data and made sure it was NULL. And then "data = load_datafile ("game.dat");"

Kitty Cat said:

Are you sure the sprite is the first object in the datafile?

Hmm...I used the grabber, and the 'x' picture is at the top. So unless the grabber index's the last item as '0' , then I'm pretty sure the 'x' picture is at the top.

no-reply@allegro.cc (scriptX) — Fri, 28 Apr 2006 02:59:58 +0000

Maybe it's failing to load?

if (!(data = load_datafile ("game.dat"))) {
  printf("error loading data file!\n");
  return -1;
}

// --- or ---

data = load_datafile ("game.dat");
if (!data) {
  printf("error loading data file!\n");
  return -1;
}

no-reply@allegro.cc (BAF) — Fri, 28 Apr 2006 03:08:06 +0000

Quote:

Not sure what you mean. I've intialized data and made sure it was NULL. And then "data = load_datafile ("game.dat");"

I meant what scriptX meant in the example he posted.

no-reply@allegro.cc (yipster) — Fri, 28 Apr 2006 03:09:04 +0000

I did something like this to make sure and commented out all the game function calls. Compiled and ran, result: data file did not fail to load.

1int main(){
2    allegro_init();
3    install_keyboard();
4    install_sound(0,MIDI_AUTODETECT,0);
5    set_color_depth(16);
6    set_gfx_mode( GFX_AUTODETECT, 640, 480, 0, 0);
7 
8    data = load_datafile ("game.dat");
9 
10    if (!data) {
11 
12    textout_centre_ex( screen, font, "error loading",  320, 240, makecol( 255, 255, 255), makecol(0, 0, 0));
13      return -1;
14      
15 
16      }
17      
18      readkey();
19}

no-reply@allegro.cc (BAF) — Fri, 28 Apr 2006 03:23:16 +0000

What is o_pic in your original source?

no-reply@allegro.cc (yipster) — Fri, 28 Apr 2006 03:27:22 +0000

x_pic represents the bitmap for 'X'
o_pic represents the bitmap for 'O'

no-reply@allegro.cc (BAF) — Fri, 28 Apr 2006 03:30:33 +0000

Is it trying to draw o_pic and failing because it is null? (I dont see anything regarding it in your source so I cant be sure).

no-reply@allegro.cc (yipster) — Fri, 28 Apr 2006 03:32:27 +0000

At the start of the game, X goes first. So I'm pretty sure it has nothing to do with o_pic. As for the code posted at the beginning, there just snippets of what I thought was relevant. The entire source is attached.

1	#include
2
3	DATAFILE *data;
4	BITMAP *x_pic;
5
6
7	data = load_datafile ("game.dat");
8
9	x_pic = (BITMAP *)data[0].dat;
10
11	else if(key[KEY_ENTER] && squares[location] != 1 && squares[location] != 2)
12	{
13	if(turn == 1)
14	{
15	draw_sprite( screen, x_pic, x, y);
16	squares[location] = turn;
17	count++;
18	}
19	else if(turn == 2)
20	{
21	draw_sprite( screen, o_pic, x, y);
22	squares[location] = turn;
23	count++;
24	}
25
26	check_win();
27	}

1	int main(){
2	allegro_init();
3	install_keyboard();
4	install_sound(0,MIDI_AUTODETECT,0);
5	set_color_depth(16);
6	set_gfx_mode( GFX_AUTODETECT, 640, 480, 0, 0);
7
8	data = load_datafile ("game.dat");
9
10	if (!data) {
11
12	textout_centre_ex( screen, font, "error loading", 320, 240, makecol( 255, 255, 255), makecol(0, 0, 0));
13	return -1;
14
15
16	}
17
18	readkey();
19	}