From: "Codey" <NO_SPAM AT NO_SPAM DOT com>
Newsgroups: comp.os.msdos.djgpp,comp.programming
References: <9n2t99$sga$1 AT news DOT telecom DOT cz>
Subject: Re: Problem with DJGPP
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Date: Wed, 05 Sep 2001 00:42:10 GMT
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"Rene" <eof AT atlas DOT cz> wrote in message news:9n2t99$sga$1 AT news DOT telecom DOT cz...
> What do I do wrong when the program built in DJGPP exits with General
> protection fault error? For example, this occurs when using the fread()
from
> stdio.h, when I want to put pixel directly into the video memory
> (0xa0000000), etc. In TC++ 3.1 everything goes well.
> I would appreciate any help.
> Rene Puchinger

0xa000000 is a selector in PM, welcome to PM, TC++ is real mode which is why
it works, to get around this in DJGPP you can use this code:

    #include <sys/nearptr.h>

    // to init
    __djgpp_nearptr_enable();
    vRam = (unsigned char *)(__djgpp_conventional_base + 0x0a0000);

    // and when you're finished
    __djgpp_nearptr_disable();

I suggest you do some more reading in the FAQ and about
__djgpp_conventional_base etc.

HTH

Ray.