Newsgroups:	comp.os.msdos.djgpp
From:	tob AT world DOT std DOT com
Subject:	Re: more with Sprites in Allegro
Message-ID:	<E9qq4r.3LD@world.std.com>
Sender:	tob AT world DOT std DOT com (Tom Breton)
Reply-To:	tob AT world DOT std DOT com
Organization:	BREnterprises
References:	<336cda63 DOT 5017831 AT news DOT primenet DOT com>
Date:	Tue, 6 May 1997 03:38:51 GMT
Lines:	50
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

libolt AT primenet DOT com (Mike McLean) writes:
> Thanks for those who responded to my earlier question.  Now I've got
> the sprite into an allegro data file.  The only problem is I can't
> figure out how to display it.  here is the code i am using
>
>
> #include <allegro.h>
> void main(int argc, char *argv[])
> {
>    char datafile_name[80];
>    int frame;
>    BITMAP *spr;
>    DATAFILE *data;
>    strcpy(datafile_name, argv[0]);
>    strcpy(get_filename(datafile_name), "cool.dat");
>    set_gfx_mode(GFX_AUTODETECT,640,480,0,0);
>    data = load_datafile (datafile_name);
>    set_pallete(data[1].dat);
>    draw_sprite (spr, data[frame].dat,0,0);

Crashes with SIGSEGV, I guess?

You're writing the data to an uninitialized pointer which, even if
initialized, would not be the screen. I didn't look to see if there were
any other problems. Try instead

    draw_sprite (screen, (BITMAP *)data[frame].dat,0,0);

Better, read the docs and try the demos. They all work (for me,
anyways), and they do most of the "tricky" stuff. Compile them. Fool
around with them. See why they do what they do.

        Tom

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