得到当前操作系统的版本的

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

#define BUFSIZE 80

int main()
{
   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)) )
   {
      osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
      if (! GetVersionEx ( (OSVERSIONINFO *) &osvi) )
         return FALSE;
   }

   switch (osvi.dwPlatformId)
   {
      // Test for the Windows NT product family.
      case VER_PLATFORM_WIN32_NT:

         // Test for the specific product family.
         if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2 )
            printf ("Microsoft Windows Server 2003 family, ");

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

         if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0 )
            printf ("Microsoft Windows 2000 ");

         if ( osvi.dwMajorVersion <= 4 )
            printf("Microsoft Windows NT ");

         // Test for specific product on Windows NT 4.0 SP6 and later.
         if( bOsVersionInfoEx )
         {
            // Test for the workstation type.
            if ( osvi.wProductType == VER_NT_WORKSTATION )
            {
               if( osvi.dwMajorVersion == 4 )
                  printf ( "Workstation 4.0 " );
               else if( osvi.wSuiteMask & VER_SUITE_PERSONAL )
                  printf ( "Home Edition " );
               else
                  printf ( "Professional " );
            }
           
            // Test for the server type.
            else if ( osvi.wProductType == VER_NT_SERVER ||
                      osvi.wProductType == VER_NT_DOMAIN_CONTROLLER )
            {
               if( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2 )
               {
                  if( osvi.wSuiteMask & VER_SUITE_DATACENTER )
                     printf ( "Datacenter Edition " );
                  else if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
                     printf ( "Enterprise Edition " );
                  else if ( osvi.wSuiteMask == VER_SUITE_BLADE )
                     printf ( "Web Edition " );
                  else
                     printf ( "Standard Edition " );
               }

               else if( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0 )
               {
                  if( osvi.wSuiteMask & VER_SUITE_DATACENTER )
                     printf ( "Datacenter Server " );
                  else if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
                     printf ( "Advanced Server " );
                  else
                     printf ( "Server " );
               }

               else  // Windows NT 4.0
               {
                  if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
                     printf ("Server 4.0, Enterprise Edition " );
                  else
                     printf ( "Server 4.0 " );
               }
            }
         }
         else  // Test for specific product on Windows NT 4.0 SP5 and earlier
         {
            HKEY hKey;
            char szProductType[BUFSIZE];
            DWORD dwBufLen=BUFSIZE;
            LONG lRet;

            lRet = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
               "SYSTEM//CurrentControlSet//Control//ProductOptions",
               0, KEY_QUERY_VALUE, &hKey );
            if( lRet != ERROR_SUCCESS )
               return FALSE;

            lRet = RegQueryValueEx( hKey, "ProductType", NULL, NULL,
               (LPBYTE) szProductType, &dwBufLen);
            if( (lRet != ERROR_SUCCESS) || (dwBufLen > BUFSIZE) )
               return FALSE;

            RegCloseKey( hKey );

            if ( lstrcmpi( "WINNT", szProductType) == 0 )
               printf( "Workstation " );
            if ( lstrcmpi( "LANMANNT", szProductType) == 0 )
               printf( "Server " );
            if ( lstrcmpi( "SERVERNT", szProductType) == 0 )
               printf( "Advanced Server " );

            printf( "%d.%d ", osvi.dwMajorVersion, osvi.dwMinorVersion );
         }

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

         if( osvi.dwMajorVersion == 4 &&
             lstrcmpi( osvi.szCSDVersion, "Service Pack 6" ) == 0 )
         {
            HKEY hKey;
            LONG lRet;

            // Test for SP6 versus SP6a.
            lRet = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
               "SOFTWARE//Microsoft//Windows NT//CurrentVersion//Hotfix//Q246009",
               0, KEY_QUERY_VALUE, &hKey );
            if( lRet == ERROR_SUCCESS )
               printf( "Service Pack 6a (Build %d)/n", osvi.dwBuildNumber & 0xFFFF );        
            else // Windows NT 4.0 prior to SP6a
            {
               printf( "%s (Build %d)/n",
                  osvi.szCSDVersion,
                  osvi.dwBuildNumber & 0xFFFF);
            }

            RegCloseKey( hKey );
         }
         else // Windows NT 3.51 and earlier or Windows 2000 and later
         {
            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/n");
         }
         break;

      case VER_PLATFORM_WIN32s:

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