我用C++改写的在桌面上飘雪特效程序

上个月圣诞节时！有个MM发给我一个程序我运行一看是在桌面飘雪的程序好棒！
昨天下午期末考试刚刚考完！我提前买了火车票还在学校里呆一天所以今下午没事便到delphi盒子上去溜达了一下看到了有刘兄写的飘雪特效的程序代码我载下来研究！用C++和SDK改写了（刘兄也是用SDK写的）此程：我运行的效果图如下：

时间太短！唉！我是画虎不成反类。。。。。只好先放上来下学期来了再整吧！我回家了就没有电脑碰了！代码中的有注译！
#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++;