From:	"Ike" <drone AT ismi DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	BITMAP pointers w/ Allegro.
Date:	Sun, 1 Aug 1999 15:19:23 -0700
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

    I've got a beginners question about the BITMAP pointer.  I have a
program that is generally structured like so:

main(void)
{
   BITMAP *bmp;
   function(bmp);
}

function(BITMAP *bmp)
{
   bmp = create_bitmap(320, 240);
}

   This small program seems to make 2 bitmap data structures when I only
want one, because whenever I try and use the newly created bitmap later in
the main() function,  it gives me crazy values which seem uninitalized.  How
do I pass the bitmap by reference so I can edit its value in sub-functions?
What am I doing wrong?  Thanks for any comments!
            -Ike

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