From: vandyrk AT gmx DOT de (Dirk Pawlowski)
Newsgroups: comp.os.msdos.djgpp
Subject: [Allegro] Page fault in my compiled program
Date: 9 Jun 2001 07:32:19 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi...
I am learning c++ and have already worked with gxx and allegro. Normally I 
get no problems by compiling little graphic programs using allegro. But now 
- after a little break of learning - there is a serious problem and I can't 
see any reasons for that. Maybe you can help me.

If I want to compile a program like this (it is only an example):

#include "allegro.h"

int main()
{
   BITMAP *b;
   allegro_init();
   install_keyboard();
   set_gfx_mode(GFX_VGA , 640, 480, 0, 0); // no different if I use 
AUTODETECT
   putpixel(b, 12, 12, 1);
   return 0;
}

After compiling this program (no errors!!!) I start the exe-File and get 
the following error message:

Shutting down Allegro
Exiting due to signal SIGSEGV
Page fault at eip=00001011, error=0006
eax=00000001 ebx=0000000c ecx=0000d370 edx=00000000 esi=0000000c 
edi=49444a44
ebp=000ca134 esp=000ca110 program=C:\DJGPP\TEMP\A.EXE
[snip some register values]
App stack: [000ca178..0004a178]  Exceptn stack: [0004a058..00048118]
Call frame traceback EIPs:
  0x00001011
  0x00001dab
  0x00027ee6

If I remove putpixel, nothing will happen. The program works. But if I add 
any graphical function (rect, circle, etc) my compiled program will not 
run.
I'm a little bit confused, since in former times I make everything in the 
same and it worked. And now I always get this error.
I have already read the FAQ, but I find nothing which can explain or solve 
my problem (If I am blind: sorry, but I have really not find anything!)

Thanx for your effort...
Tot ziens
Dirk
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