From: Bjorn Hansen <viking AT xyz DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: what's wrong with this code?
Date: Sat, 01 Aug 1998 12:02:52 -0800
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To: djgpp AT delorie DOT com
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I know that this must be something simple that I am missing but when I
try to compile this:

#include <stdio.h>
#include <sys/farptr.h>

main()
{
 char v;
 v=_farpeekb(_dos_ds,0xA0000);
 printf("%c",v);
}

I get a Error of '_dos_ds' undeclared
what am I doing wrong or not doing?


d info files I finally achieved
>for the monitor to give me a sign that it actually changed to a mode 13h --
>the graphics mode.  However it will not show a pixel, a box or a line.
>[...]Here is the program that I am trying to work with:
[...]
>void GrLine(int x1,int y1,int x2,int y2,GrColor c)
etc...

why don't you use the Allego library, and use:

void do_line(BITMAP *bmp, int x1, y1, x2, y2, int d, void (*proc)());
Calculates all the points along a line from point (x1, y1) to (x2,
y2), calling the supplied function for each one. This will be
passed a copy of the bmp parameter, the x and y position, and a copy
of the d parameter, so it is suitable for use with
putpixel(). 

there are lots of other good graphics routines in it.

cheers