vc++ 设置64位编译器

   SYSTEM_INFO si;
    GetNativeSystemInfo(&si);
    if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 ||   
        si.wProcessorArchitecture != PROCESSOR_ARCHITECTURE_IA64 )
    {
        //64 位操作系统
        MessageBox(NULL,"64位操作系统","系统检测",MB_OK);
        return TRUE;
    }
    else
    {
        // 32 位操作系统
        MessageBox(NULL,"32位操作系统","系统检测",MB_OK);
        return FALSE;
    }