Message-Id: <199807070014.BAA14407@sable.ox.ac.uk>
Comments: Authenticated sender is <mert0407 AT sable DOT ox DOT ac DOT uk>
From: George Foot <george DOT foot AT merton DOT oxford DOT ac DOT uk>
To: Oliver Batchelor <batch AT netaccess DOT co DOT nz>
Date: Tue, 7 Jul 1998 01:13:05 +0000
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Subject: Re: Data files.... Again... Won't identify things inside the da
Reply-to: george DOT foot AT merton DOT oxford DOT ac DOT uk
CC: djgpp AT delorie DOT com
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On  6 Jul 98 at 5:52, Oliver Batchelor wrote:

> Hello,
> When I load my data file called tile.dat it works fine. (this is the start
> of an editor for a game I am making)
> When I go to put an image from the data file (16 bit compiled sprite and 16
> bit bitmap)
> It tells me that I have undeclared Idifiers even when I use the exact names
> from the data file. eg.   (If you need to see the whole thing (quite short
> 1k) its attached)

If you want to use the datafile in this way you must tell the grabber 
or dat utility to output a header file along with the datafile.  You 
then include this header file in any source files that refer to the 
datafile objects.  The header file defines things like `TILE1_TGA' to 
the objects' indices in the datafile.


For more information, see:

    Allegro documentation: `allegro/allegro.txt', section "Datafile 
        routines" (line 3602 in my copy)

    Grabber documentation: `allegro/tools/grabber.txt', section 
        "Accessing Datafiles" (line 413 in my copy) which goes into 
        much more detail

    Allegro Vivace, subsection 10.3.1 ("Loading an entire datafile"). 
        [I know this is a strange place to talk about using the 
        datafile; when I get some time I'll sort this out.]


-- 
george DOT foot AT merton DOT oxford DOT ac DOT uk