From: Thomas Demmer <demmer AT LSTM DOT Ruhr-UNI-Bochum DOT De>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: environment djggp: ALL OK, else NOT :(
Date: Wed, 10 Sep 1997 13:55:19 +0200
Organization: Lehrstuhl fuer Stroemungsmechanik
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The NiBBLeR wrote:
> 
> Hello,
> 
> I'm programming a 3d-engine in djgpp at the moment.
> But now I found something ratherly strange:
> 
> when I have the DJGPP-environment-variable on:
>     SET DJGPP=C:\DJGPP\DJGPP.ENV
> my engine works OK !!!
> 
> but when I want to run this engine (I include cwsdpmi.exe for the dpmi)
> on another computer without djgpp, I get a general protection fault ????
> (btw I tried all kind of different systems, and it only works when djgpp
> is on there... )
> 
> and I would like to spread my engine without the need of WHOLE DJGPP...
> 
> Does somebody know how this is possible, and what the causes may be...
> ???
> THANK YOU VERY MUCH IS ADVANCE!!!
> 
Just a wild guess:
You load some graphics font, screen driver or whatever
from somewhere under /djgpp. And the graphics code searches
under ${DJGPP}/lib or any variable listed in djgpp.env.

If so, the cure will be
  -distribute the exe, cwsdpmi & the fonts
  -at run time, figure out the location of the executable
    This might be tricky, but checking argv[0] usually suffices..
  - Then issue in the program a
      setenv("WHAT_EVER_VAR_IT_NEEDS", path_to_exe, 0);
    This will overwrite WHAT_EVER_VAR_IT_NEEDS only if it
    is not yet set.

  - Hope for the best ;-)

-- 
Ciao
Tom

*************************************************************
* Thomas Demmer                                             *
* Lehrstuhl fuer Stroemungsmechanik                         *
* Ruhr-Uni-Bochum                                           *
* Universitaetsstr. 150                                     *
* D-44780  Bochum                                           *
* Tel: +49 234 700 6434                                     *
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