#include〈windows.h〉
    #include〈time.h〉
    #include〈stdlib.h〉
    #include〈iostream.h〉

    const int SnowNumber=500; //雪点数量

    struct SnowNode
    {
     POINT postion;  //雪点位置
     int   iColor; //先前的颜色
     int   iSpeed; //下落速度
     int   iMove; //下落距离
     int   iStick; //粘贴度
    };

    SnowNode SnowNodes[SnowNumber]; //雪点数组
    int   hTimer=0;
    int   CrWind=0;
    int   CrStep=0; //当前循环步数(用于限速)
    int   ScreenWidth=0;  //屏幕宽度
    int   ScreenHeight=0;  //屏幕高度

    void GetScreenSize();
    void CALLBACK TimerProc(HANDLE hWnd,UINT uMsg,UINT idEvent,DWORD dwTime);
    void InitSnowNodes();
    void MoveSnowNodes();

    int WINAPI  WinMain(HINSTANCE hInstance,
           HINSTANCE hPrevInstance,
           LPSTR  lpCmdLine,
           int   nCmdShow
           )
    {


     MSG msg; //标准windows消息
     LARGE_INTEGER Frequency; //高性能定时器频率
     LARGE_INTEGER StartCt,EndCt;//高性能定时器计数
    float ElapsedTime;      //时间间隔
     srand((unsigned)time(NULL));
     GetScreenSize();
     InitSnowNodes();
     QueryPerformanceFrequency(&Frequency);
     hTimer=SetTimer(0,0,rand()%5*500,(TIMERPROC)TimerProc);
     if(hTimer==0)
     {
      MessageBox(0,TEXT(“创建定时器失败“),TEXT(“提示“),MB_OK|MB_ICONINFORMATION);
      return -1;
     }
     RegisterHotKey(0,0,MOD_CONTROL,(int)’L’);
     while(1)
     {
      QueryPerformanceCounter(&StartCt); //执行运算前计数值
      if(PeekMessage(&msg,0,0,0,1))
      {
       switch(msg.message)
       {
        case WM_TIMER: TimerProc(0,0,0,0);
            break; //预设风向改变时间已到
        case WM_HOTKEY: KillTimer(0,hTimer);//删除随机风向定时 器
            UnregisterHotKey(0,0);//删除退出热键
            InvalidateRect(0,NULL,true);
            exit(1);
            break;
        case WM_DISPLAYCHANGE:
            GetScreenSize(); //重新取屏幕的尺寸
            InitSnowNodes(); //初始化雪点的数组
            break;
       }

      }
      MoveSnowNodes();
      QueryPerformanceCounter(&EndCt);//执行运算后的计数值
      ElapsedTime=(EndCt.QuadPart-StartCt.QuadPart)/Frequency.QuadPart;
      if((ElapsedTime〈0.0005))
       Sleep(2); //简单限速
      else if(ElapsedTime〈0.0010)
        Sleep(1);
        else if(ElapsedTime〈0.0015)
         Sleep(3);

     }
     //MessageBox(0,TEXT(“消息“),TEXT(“消息“),MB_OK|MB_ICONINFORMATION);
     return 0;
    }
    void GetScreenSize()
    {
     ScreenWidth=GetSystemMetrics(SM_CXSCREEN);
     ScreenHeight=GetSystemMetrics(SM_CYSCREEN);
     return ;
    }

    void CALLBACK TimerProc(HANDLE hWnd,UINT uMsg,UINT idEvent,DWORD dwTime)
    {
    // MessageBox(0,TEXT(“消息“),TEXT(“消息“),MB_OK|MB_ICONINFORMATION);
     srand((unsigned)time(NULL));
     if(hTimer==0)
     {
      MessageBox(0,TEXT(“创建定时器失败“),TEXT(“提示“),MB_OK|MB_ICONINFORMATION);
      return ;
     }
     SetTimer(0,hTimer,((rand()%27+4)*500),(TIMERPROC)TimerProc); //// 重设下次风向改变时间
     //修改风向
     if(CrWind!=0)
      CrWind=0;
     else
         CrWind=rand()%3-1;
     return ;
    }

    void InitSnowNodes()
    {
     HDC hScreenDC=0;
     int j=0;
     hScreenDC=CreateDC(“DISPLAY“,NULL,NULL,NULL);
      if(hScreenDC==NULL)
     {
      MessageBox(0,“获取屏幕DC失败!“,“信息“,MB_OK|MB_ICONERROR);
      return ;
     }
     srand((unsigned)time(NULL));
     for(j=0;j〈SnowNumber;j++)
     {
      SnowNodes[j].postion.x=rand()%ScreenWidth;
      SnowNodes[j].postion.y=rand()%ScreenHeight;
      SnowNodes[j].iColor=GetPixel(hScreenDC,SnowNodes[j].postion.x,SnowNodes[j].postion.y);
      SnowNodes[j].iSpeed=(rand()%5+1);       //每次下落距离（1-5）
      SnowNodes[j].iStick=(30-rand()%SnowNodes[j].iSpeed); //粘贴度（几次循环作一次粘贴连判断
    //  cout〈〈SnowNodes[j].postion.x〈〈“   Y:“〈〈SnowNodes[j].postion.y〈〈endl;

     }
     DeleteDC(hScreenDC);
    }

    void MoveSnowNodes()
    {
    // MessageBox(0,TEXT(“消息“),TEXT(“消息“),MB_OK|MB_ICONINFORMATION);
     HDC hScreenDC=0;
     srand((unsigned)time(NULL));
     int x=0,y=0,i=0;
     hScreenDC=CreateDC(“DISPLAY“,NULL,NULL,NULL);
     if(hScreenDC==NULL)
     {
      MessageBox(0,“获取屏幕DC失败!“,“信息“,MB_OK|MB_ICONERROR);
      return ;
     }
    // TextOut(hScreenDC,0,0,“虽然大检查顺顺藤摸瓜克格勃呀加“,0);
     for(i=0;i〈SnowNumber;i++)
     {
      //控制雪点下降速度
      if((CrStep%SnowNodes[i].iSpeed)!=0)
       continue;
      //恢复上次被覆盖点
      if((GetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y))==0XFFFFFF)
       SetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y,SnowNodes[i].iColor);
      //根据几向作随机飘落
      x=SnowNodes[i].postion.x+rand()%3+CrWind;
      y=SnowNodes[i].postion.y+SnowNodes[i].iMove;

      //积雪（停留）效果处理
      if(  ( (CrStep%SnowNodes[i].iStick)==0)
         &&( (GetPixel(hScreenDC,x,y))!=(GetPixel(hScreenDC,x,y+1)))
         &&( (GetPixel(hScreenDC,x-1,y))!=(GetPixel(hScreenDC,x-1,y+1)))
         &&( (GetPixel(hScreenDC,x+1,y))!=GetPixel(hScreenDC,x+1,y+1))
         )
      {
       //稍稍调整坐标
       if(GetPixel(hScreenDC,x,y-1)==GetPixel(hScreenDC,x,y-2))
       {
        y--;
       }
       else
       {
           if(GetPixel(hScreenDC,x,y-1)==GetPixel(hScreenDC,x,y-2))
         y++;
        x+=CrWind;
       }
       //画三个雪花点
       SetPixel(hScreenDC,x,y,0XFFFFFF);
       SetPixel(hScreenDC,x+1,y+1,0XFFFFFF);
       SetPixel(hScreenDC,x-1,y+1,0XFFFFFF);
       //重生雪点
       SnowNodes[i].postion.x=rand()%ScreenWidth;
       SnowNodes[i].postion.y=rand()%10;
       SnowNodes[i].iColor=GetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y);

      }
      else
      {
       if( (x〈0) || (x〉ScreenWidth) || (y〉ScreenHeight))
       {
        SnowNodes[i].postion.x=(rand()%10);
        SnowNodes[i].postion.y=(rand()%ScreenWidth);
        SnowNodes[i].iColor=GetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y);

       }
       else
       {
        //保存颜色并绘制雪点
        SnowNodes[i].iColor=GetPixel(hScreenDC,x,y);
        SetPixel(hScreenDC,x,y,0XFFFFFF);
        //此时保存新雪点位置
        SnowNodes[i].postion.x=x;
        SnowNodes[i].postion.y=y;
       }
      }


     }
     DeleteDC(hScreenDC);
     CrStep++;
    }