From:	Damian Yerrick <MYNAMEISd_yerrick AT hotmail DOT comNO2CANNEDHAM>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: How to create overlays
Organization:	Pin Eight Software http://pineight.8m.com/
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References:	<87n9tr$5r5$1 AT ac1 DOT ewetel DOT de>
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NNTP-Posting-Date:	Mon, 07 Feb 2000 21:00:03 GMT
Distribution:	world
Date:	Mon, 07 Feb 2000 21:00:03 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

On Mon, 7 Feb 2000 21:28:11 +0100, "Thorsten Erdmann"
<thorsten DOT erdmann AT gmx DOT de> wrote:

>Hi,
>
>I want to create a set of routines which should be loaded on demand from the
>main program. These routines are a hardwaredriver for several display types.
>I want to define some routines like putpixel, drawstring etc. These routines
>exist for every display type and should be in a file separated from the main
>program, so the user can exchange these driver files without recompiling the
>main program.
>
>How can I do this? I thought of creating a structure which hold pointers to
>every function. Then I load the driver into memory, initialize that
>structure and then call the routines over that structure. But how do I
>compile that driver module and how do I read where in that file is each
>funtion.

So you want dynamic linking.  Try DLX:
  http://nanosoft.hypermart.net/dlx.html

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