#include <windows.h>
#include <stdio.h>


BOOL DisplaySystemVersion()
{
   OSVERSIONINFOEX osvi;
   BOOL bOsVersionInfoEx;


   // Try calling GetVersionEx using the OSVERSIONINFOEX structure.
   // If that fails, try using the OSVERSIONINFO structure.


   ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
   osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

   if( !(bOsVersionInfoEx = GetVersionEx ((OSVERSIONINFO *) &osvi)) )
   {
      // If OSVERSIONINFOEX doesn't work, try OSVERSIONINFO.
      osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
      if (! GetVersionEx ( (OSVERSIONINFO *) &osvi) ) 
         return FALSE;
   }


   switch (osvi.dwPlatformId)
   {
      // Tests for Windows NT product family.
      case VER_PLATFORM_WIN32_NT:
      // Test for the product.
         if ( osvi.dwMajorVersion <= 4 )

            printf("Microsoft Windows NT ");



         if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0 )

            printf ("Microsoft Windows 2000 ");




         if( bOsVersionInfoEx )  // Use information from GetVersionEx.
         { 
         // Test for the workstation type.
            if ( osvi.wProductType == VER_NT_WORKSTATION )
            {
               if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1 )
                  printf ("Microsoft Windows XP ");


               if( osvi.wSuiteMask & VER_SUITE_PERSONAL )
                  printf ( "Home Edition " );
               else
                  printf ( "Professional " );
            }


         // Test for the server type.
            else if ( osvi.wProductType == VER_NT_SERVER )
            {
               if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1 )

                  printf ("Microsoft Windows .NET ");



               if( osvi.wSuiteMask & VER_SUITE_DATACENTER )

                  printf ( "DataCenter Server " );

               else if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )

                  if( osvi.dwMajorVersion == 4 )

                     printf ("Advanced Server " );

                  else

                     printf ( "Enterprise Server " );

               else if ( osvi.wSuiteMask == VER_SUITE_BLADE )

                  printf ( "Web Server " );

               else

                  printf ( "Server " );

            }

         }

         else   // Use the registry on early versions of Windows NT.

         {

            HKEY hKey;

            char szProductType[80];

            DWORD dwBufLen;



            RegOpenKeyEx( HKEY_LOCAL_MACHINE,

               "SYSTEMCurrentControlSetControlProductOptions",

               0, KEY_QUERY_VALUE, &hKey );

            RegQueryValueEx( hKey, "ProductType", NULL, NULL,

               (LPBYTE) szProductType, &dwBufLen);

            RegCloseKey( hKey );

            if ( lstrcmpi( "WINNT", szProductType) == 0 )

               printf( "Professional " );

            if ( lstrcmpi( "LANMANNT", szProductType) == 0 )

               printf( "Server " );

            if ( lstrcmpi( "SERVERNT", szProductType) == 0 )

               printf( "Advanced Server " );

         }



      // Display version, service pack (if any), and build number.



         if ( osvi.dwMajorVersion <= 4 )

         {

            printf ("version %d.%d %s (Build %d)n",

               osvi.dwMajorVersion,

               osvi.dwMinorVersion,

               osvi.szCSDVersion,

               osvi.dwBuildNumber & 0xFFFF);

         }

         else

         {

            printf ("%s (Build %d)n",

               osvi.szCSDVersion,

               osvi.dwBuildNumber & 0xFFFF);

         }

         break;



      // Test for the Windows 95 product family.

      case VER_PLATFORM_WIN32_WINDOWS:



         if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 0)

         {

             printf ("Microsoft Windows 95 ");

             if ( osvi.szCSDVersion[1] == 'C' || osvi.szCSDVersion[1] == 'B' )

                printf("OSR2 " );

         }



         if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 10)

         {

             printf ("Microsoft Windows 98 ");

             if ( osvi.szCSDVersion[1] == 'A' )

                printf("SE " );

         }



         if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 90)

         {

             printf ("Microsoft Windows Millennium Edition ");

         }

         break;

   }

   return TRUE;

}