Date:	Fri, 15 Dec 2000 16:55:13 +0100 (MET)
From:	Martin Stromberg <eplmst AT lu DOT erisoft DOT se>
Message-Id:	<200012151555.QAA16750@lws256.lu.erisoft.se>
To:	djgpp-workers AT delorie DOT com
Subject:	(fwd) Re: Getting the Windows NT version from DOS
Newsgroups:	comp.os.msdos.programmer
Reply-To:	djgpp-workers AT delorie DOT com

Hello.

I saw this on comp.os.msdos.programmer. It's source code to get
WINDOZE version, apparantly making it possible to discern between NT
and 2000.

Can we use this?


Right,

						MartinS

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From: "Joe Hagen" <jdhagen AT chorus DOT net>
Newsgroups: comp.os.msdos.programmer
Subject: Re: Getting the Windows NT version from DOS
Date: Tue, 12 Dec 2000 15:38:33 -0600
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Here is some sample code.

The 16-bit app is vdd16.c.

It was compiled with VC++ 1.52.

It loads the VDD "on demand", which is used
to call GetVersionEx.

The 16-bit program passes a buffer to
the VDD, which is filled in with the
version info.

The _emit lines contain the BOP codes.

VDDX.C was built with VC++ 6.0, and
is the 32-bit side.  It creates VDDX.DLL.

The output of vdd16.exe on my system is:

     4 0 Service Pack 6

===============================
vdd16.c
===============================

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

typedef struct _OSVERSIONINFO{
  unsigned long dwOSVersionInfoSize;
  unsigned long dwMajorVersion;
  unsigned long dwMinorVersion;
  unsigned long dwBuildNumber;
  unsigned long dwPlatformId;
  char szCSDVersion[ 128 ];
} OSVERSIONINFO;

int docall(OSVERSIONINFO *pOSV)
{
   unsigned short handle;
   unsigned short osvsize;
   int errcode=0;
   char *pfilename="VDDX.DLL";
   char *pinitfunc="VDDInit";
   char *pdispfunc="VDDDispatch";

   osvsize=sizeof(*pOSV);

   __asm {
         push  es
         push  ds
         push  si
         push  di
         push  bx

         mov   ax,ss
         mov   es,ax
         mov   ds,ax

         mov   si,word ptr[pfilename]
         mov   di,word ptr[pinitfunc]
         mov   bx,word ptr[pdispfunc]

      ; Invoke "RegisterModule"

         _emit 0c4h
         _emit 0c4h
         _emit 58h
         _emit 00h

         jnc    a_1

         mov   word ptr[errcode],ax
         jmp   done

a_1:
         mov   word ptr[handle],ax

         mov     cx,osvsize
         mov     si,word ptr[pOSV]

         ; Invoke "DispatchCall"

         _emit 0c4h
         _emit 0c4h
         _emit 58h
         _emit 02h

         ; Invoke "UnregisterModule"

         mov     ax,word ptr[handle]

         _emit 0c4h
         _emit 0c4h
         _emit 58h
         _emit 01h
   }

done:
   __asm {

         pop   bx
         pop   di
         pop   si
         pop   ds
         pop   es
   }

   return errcode;
}



int main(void)
{
   int result;
   OSVERSIONINFO osv;

   osv.dwOSVersionInfoSize=sizeof(osv);

   result=docall(&osv);

   if (result==0)
   {
      printf("%lu %lu
%s\n",osv.dwMajorVersion,osv.dwMinorVersion,osv.szCSDVersion);
   }
   else
   {
      printf("ERROR: code=%d\n",result);
   }

   return 0;
}

===============================
vddx.c  (32-bit code)
===============================
#include <windows.h>
#include <vddsvc.h>

/*
 *
 * VDDInitialize
 *
 * Arguments:
 *     DllHandle - Identifies this VDD
 *     Reason - Attach or Detach
 *     Context - Not Used
 *
 * Return Value:
 *     TRUE: SUCCESS
 *     FALSE: FAILURE
 *
 */
 BOOL VDDInitialize(
    IN PVOID DllHandle,
    IN ULONG Reason,
    IN PCONTEXT Context OPTIONAL
    )
{

   switch(Reason)
   {

      case DLL_PROCESS_ATTACH:
         OutputDebugString("ATTACH\n");
         break;

      case DLL_PROCESS_DETACH:
         OutputDebugString("DETACH\n");
         break;

      default:
         break;
   }

   return TRUE;
}


/*
 *
 * VDDTerminateVDM
 *
 */
VOID VDDTerminateVDM( VOID )
{
   OutputDebugString("VDDTERMINATE\n");
   return;
}


/*
 *
 * VDDInit
 *
 */
VOID VDDInit( VOID )
{
   OutputDebugString("VDDINIT\n");
   setCF( 0 );
}


/*
 *
 * VDDDispatch
 *
 * Arguments:
 *     CX=size of buffer
*      DS:SI pointer to buffer
 * Return Value:
 *     clears carry flag
 *     buffer filled with results of GetVersionEx
 *
 */

 VOID VDDDispatch( VOID )
{
   USHORT  PassCX;
   PCHAR Buffer;

   setCF(0);

   PassCX = getCX();

   Buffer = (PCHAR)
GetVDMPointer((ULONG)(getDS()<<16|getSI()),PassCX,FALSE);

   GetVersionEx((OSVERSIONINFO *) Buffer);
}



Joe Hagen
jdhagen AT chorus DOT net

<martin_payne AT my-deja DOT com> wrote in message
news:915j8b$jf4$1 AT nnrp1 DOT deja DOT com...
> Sounds good. What VDD do you access? Could you provide some sample code?
>

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