Message-ID:	<01BBAE2A.8D145500@slip00-17.btx.dtag.de>
From:	Daniel Jungbluth <danju AT t-online DOT de>
To:	"'DJGPP Mailing List'" <djgpp AT delorie DOT com>
Subject:	Re: Simple Questions
Date:	Sun, 29 Sep 1996 17:20:34 +-100
MIME-Version:	1.0

Tim Gunn wrote:

>Secondly how do i test if a program is running under windows?
>and how do i find out the version of the DOS/Windows version.

The following code demonstrates, how to find the Windows version (feel =
free to use it in your program but let me know about your program :)

#include <dos.h>
#include <stdio.h>
#include <dpmi.h>

#define NO_WIN		0x00
#define WIN_386_X		0x01
#define WIN_REAL		0x81
#define WIN_STANDARD	0x82
#define WIN_ENHANCED	0x83

 int windows_version( int *major, int *minor )
{
  __dpmi_regs regs;

  *major =3D 0;
  *minor =3D 0;

/*-- Identifiziere Windows x.y im Erweiterten-Modus -----------------*/

  regs.x.ax =3D 0x1600;                    /* Installationscheck Windows =
*/

  __dpmi_int( 0x2F, &regs );

  switch ( regs.h.al )
  {
    case 0x01:
    case 0xFF:  	*major =3D 2;*minor =3D 0;return WIN_386_X;    /* =
Windows /386 Version 2.x */

    case 0x00:
    case 0x80:  	regs.x.ax =3D 0x4680;           /* Real- u. =
Standardmodus */
__dpmi_int( 0x2F, &regs );
		if ( regs.h.al =3D=3D 0x80 ) return NO_WIN;                  /* =
Windows l"uft nicht */
		else
		{
		 /*-- Windows im Real- oder Standardmodus --------------*/
		  regs.x.ax =3D 0x1605;      /* Initialisierung simulieren */
		  regs.x.bx =3D regs.x.si =3D regs.x.cx =3D regs.x.es =3D regs.x.ds =
=3D 0x0000;
		  regs.x.dx =3D 0x0001;
  __dpmi_int( 0x2F, &regs );
  if ( regs.x.cx =3D=3D 0x0000 )
		  {
		 /*-- Windows im Real-Modus ---------------------------*/
		     regs.x.ax =3D 0x1606;
		    __dpmi_int( 0x2F, &regs );
		     return WIN_REAL;
		  }
		  else return WIN_STANDARD;
		}
		 /*-- Windows im Erweiterten-Modus, ax enth"lt Versionsnummer =
-------*/

		 default: *major =3D regs.h.al;        /* Windows Version ausgeben */
			*minor =3D regs.h.ah;
			return WIN_ENHANCED;        /* Windows im Erweiterten-Modus */
	}
}

int main( void )
{
  int win_mode,hver,lver;

  win_mode =3D windows_version( &hver, &lver );
  switch ( win_mode )
  {
    case NO_WIN: printf( "Windows not active\n" );break;
    case WIN_REAL: printf( "Windows/real-mode detected\n" );break;
    case WIN_STANDARD: printf( "Windows/standard-mode detected\n" =
);break;
    case WIN_386_X: printf( "Windows/386 V 2.x detected" );break;
    case WIN_ENHANCED: printf( "Windows/enhanced-mode v%d.%d =
detected\n",hver, lver );break;
  }
  return( win_mode );
}

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