To:	djgpp AT delorie DOT com
Subject:	Problems using allegro
Message-ID:	<19970312.054752.7495.0.fwec@juno.com>
From:	fwec AT juno DOT com (Mark T Logan)
Date:	Wed, 12 Mar 1997 05:49:39 EST

Hello.

I have written a fairly simple program to translate TGA files to
PCX files using allegro.  It crashes.  Here is my source code.

-----------------------------------------------------------------------------------
#include <allegro.h>
#include <string.h>
#include <iostream.h>
#include <dir.h>
#include <dos.h>

int main(int argc, char *argv[])
{
 char infile[13];
 char outfile[13];

 ffblk fileinfo;

 PALETTE pal;
 BITMAP *bitin;

 if(argc != 3) // check the command line arguments.
  {
   cout << "wrong number of args.";
   return 0;
  }

 strcpy(infile, argv[1]);   // copy the arguments into the file name
strings
 strcpy(outfile, argv[2]);

 if(findfirst(infile, &fileinfo, 0)) // make sure that the infile exists!
  {
   cout << "\nFile does not exist, or is a hidden or system file\n";
   return 0;
  }

 bitin = load_tga(infile, pal); // load the TGA file

 save_pcx(outfile, bitin, pal); // save it as a pcx file
}
--------------------------------------------------------------------------------------

This is the command line I used to compile it.

 9:32p c:\gnu\bin>gcc -g -o trans trans.cpp -lalleg -lgpp -lc

This is the dump(symified) that is printed out after I run the program

 9:33p c:\gnu\bin>trans out.tga out.pcx
Exiting due to signal SIGSEGV
Page fault at eip=00002c5a, error=0004
eax=00000000 ebx=00085000 ecx=00000000 edx=00031c00 esi=00030d70
edi=000381e0
ebp=000781b8 esp=00077c2c cs=00a7 ds=00af es=00af fs=008f gs=00bf ss=00af
Call frame traceback EIPs:
  0x00002c5a   _save_pcx+254
  0x00021c87   ___crt1_startup+115

I have no idea what is causing this.  I'm guessing it's something silly I
did wrong because
I have had no trouble with any of these functions in the past when they
were used by
themselves.  (although this is the first time I've used load_tga);

 out.tga is a file that exists in the current directory.
It was created by Polyray version 1.6

Any responses/answers/flames/questions/donations appreciated.

TIA


||                                         Fwec AT juno DOT com
||
|| "Why can they make a potato chip in one second, but it takes us months
to
||   develop software?" - Dilbert's Boss
||

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