From:	Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: "load_bitmap" newbie...
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Date:	Sun, 25 Jun 2000 04:04:48 GMT
To:	djgpp AT delorie DOT com
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On Sat, 24 Jun 2000 17:08:40 -0500, "23yrold3yrold" <cbarry AT pangea DOT ca>
wrote:

>I'm having trouble using some functions in Allegro; I think the documents
>assume a little too much (or I'm just dense). I've been trying to learn by
>reading bloddy near every source of Allegro tutorials on the Net but I get
>things like the following. I know it should work (according to Allegro's
>accompanying documentation) and it's copied exactly as is out of a tutorial.
>I also know I'm missing something simple, and hope someone will be kind
>enough to share. I have a bitmap called Test.bmp and it's 32 x 32, in the
>same folder as the executable, but I can't figure out where in the program
>the name of it should go (knowing my luck I have to put it a few places).
>The compiler gets this far before it stops and returns an error. Much thanx
>to whomever schools me in this.
>
>#include <stdlib.h>
>#include <stdio.h>
>
>#include "allegro.h"

If you did a "make install" it should be
#include <allegro.h>

>BITMAP *pic;
>PALETTE pal;
>
>int x,y;
>
>main(void)

Best to specify the return type of main()

int main(void)

or better yet, to leave yourself open for commandline arguments and/or
drag-and-drop files onto your icon:

int main(const int argc, const char **argv)


>{
>allegro_init();

install_timer() should always be the first routine you call after
allegro_init().  The keyboard and mouse routines depend on it.

> install_keyboard();
> set_color_depth(16);
> set_gfx_mode(GFX_AUTODETECT,640,480,0,0);

On systems (X, Windows) where the OS provides input via events, the
keyboard should be started _after_ the graphics mode is set.  Think
portability.

> load_bitmap(pic,pal);
>
>Error: passing 'BITMAP *' as argument 1 of 'load_bitmap(char*, RGB*)'

pic = load_bitmap("precious_moments.pcx", pal);

Then finish the program:

  blit(pic, screen, 0, 0, 0, 0, pic->w, pic->h);
  destroy_bitmap(pic); // equivalent of free() for BITMAP *
  readkey();
  return 0;
} END_OF_MAIN();

Some systems (Eunuchs, Windows) require END_OF_MAIN() (an Allegro
3.9.x feature) immediately following the closing brace of main().
Again, portability.

-- 
Damian Yerrick
"I refuse to listen to those who refuse to listen to reason."
See the whole sig: http://www.rose-hulman.edu/~yerricde/sig.html

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