getver.c

#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)
   {
      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 ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1 )
            printf ("Microsoft Windows XP ");

      // Test for product type.

         if( bOsVersionInfoEx )
         {
            if ( osvi.wProductType == VER_NT_WORKSTATION )
            {
               if( osvi.wSuiteMask & VER_SUITE_PERSONAL )
                  printf ( "Personal " );
               else
                  printf ( "Professional " );
            }

            else if ( osvi.wProductType == VER_NT_SERVER )
            {
               if( osvi.wSuiteMask & VER_SUITE_DATACENTER )
                  printf ( "DataCenter Server " );
               else if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
                  printf ( "Advanced Server " );
               else
                  printf ( "Server " );
            }
         }
         else
         {
            HKEY hKey;
            char szProductType[80];
            DWORD dwBufLen;

            RegOpenKeyEx( HKEY_LOCAL_MACHINE,
               "SYSTEM\\CurrentControlSet\\Control\\ProductOptions",
               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;

      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 Me ");
         } 
         break;

      case VER_PLATFORM_WIN32s:

         printf ("Microsoft Win32s ");
         break;
   }
   return TRUE; 
}

int main(void)
{
    DisplaySystemVersion();
}