#include "stdafx.h"
//#include<windows.h>
//如果有错误将上面的注释取消
#define NUM 300

int main(int argc, char* argv[])
{
     // TODO: Place code here.
    static int iKeep[NUM][4];
    HDC hdcScr, hdcMem;
    int cx,cy;
    HBITMAP hBitmap;
    HWND hWnd;
    int i,j,x1,y1,x2,y2;
    //MSG msg;
    //HACCEL hAccelTable;
    if(LockWindowUpdate(hWnd = GetDesktopWindow()))                                      //将所有窗口的更新锁定
    {
        hdcScr   =     GetDCEx(hWnd,NULL,DCX_CACHE | DCX_LOCKWINDOWUPDATE);              //获得屏幕的设备
        hdcMem   =     CreateCompatibleDC(hdcScr);                                       //创建一个屏幕设备
        cx       =     GetSystemMetrics(SM_CXSCREEN)/10;                                 //取得屏幕的宽的10之1
        cy       =     GetSystemMetrics(SM_CYSCREEN)/10;                                 //取得屏幕的高的10之1
        hBitmap  =     CreateCompatibleBitmap(hdcScr,cx,cy);
        SelectObject(hdcMem,hBitmap);                                                    //创建一个位图
        srand((int)GetCurrentTime());                                                    //取得时间
        for(i = 0; i < 2; i++)
        for(j = 0; j < NUM; j++)
        {
            if(i == 0)
            {
                iKeep[j][0] = x1 = cx * (rand()%10);
                iKeep[j][1] = y1 = cy * (rand()%10);
                iKeep[j][2] = x2 = cx * (rand()%10);
                iKeep[j][3] = y2 = cy * (rand()%10);
            }
            else
            {
                x1 = iKeep[NUM - 1 - j][0];
                y1 = iKeep[NUM - 1 - j][1];
                x2 = iKeep[NUM - 1 - j][2];
                y1 = iKeep[NUM - 1 - j][3];

            }
            BitBlt(hdcMem,0,0,cx,cy,hdcScr,x1,y1,SRCCOPY);                             //将屏幕上的图像复制到自创的设备上
            BitBlt(hdcScr,x1,y1,cx,cy,hdcScr,x2,y2,SRCCOPY);                           //将屏幕上的图像复制到自身屏幕上
            BitBlt(hdcScr,x2,y2,cx,cy,hdcScr,0,0,SRCCOPY);                             //同上
            Sleep(10);
        }
    DeleteDC(hdcMem);
    ReleaseDC(hWnd,hdcScr);
    DeleteObject(hBitmap);
    LockWindowUpdate(NULL);                                                            //解除屏幕锁定
    }
    return 0;
}