判断系统是否为XP的小函数

 

#define PACKVERSION( x, y ) MAKELONG(  x, y )

 BOOL  IsXP(   void ) ...{ return GetWinVersion( ) > PACKVERSION(5, 1) ? TRUE:FALSE}

 DWORD GetWinVersion( void )

...{
       static DWORD c_dwWinVers=0;    // check win version only once (will not change during application)
       if(!c_dwWinVers)
      ...{    
             OSVERSIONINFO osvi;    
             ZeroMemory(&osvi, sizeof(OSVERSIONINFO));    // Initialize the OSVERSIONINFO structure.
            osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
            GetVersionEx(&osvi);
            c_dwWinVers=PACKVERSION(osvi.dwMajorVersion,osvi.dwMinorVersion);
       }
       return c_dwWinVers;
}