截图

HBITMAP CopyScreenToBitmap(int x1, int x2, int y1, int y2)
{
//屏幕和内存设备描述表
HDC hSrcDC, hMemDC;
//位图句柄
HBITMAP hBitmap, hOldBitmap;
//选定区域坐标
int nX, nY, nX2, nY2;
//位图宽度和高度
int nWidth, nHeight;
//屏幕分辨率
int xScrn, yScrn;
/*
//确保选定区域不为空矩形
if(IsRectEmpty(lpRect))
return NULL;*/
//为屏幕创建设备描述表
hSrcDC = CreateDC("DISPLAY", NULL, NULL, NULL);
//为屏幕设备描述表创建兼容的内存设备描述表
hMemDC = CreateCompatibleDC(hSrcDC);
//获得选定区域坐标
nX = x1;
nY = y1;
nX2 = x2;
nY2 = y2;
//获得屏幕分辨率
xScrn = GetDeviceCaps(hSrcDC, HORZRES);
yScrn = GetDeviceCaps(hSrcDC, VERTRES);
//确保选定区域是可见的
if(nX<0)
nX = 0;
if(nY<0)
nY = 0;
if(nX2>xScrn)
nX2 = xScrn;
if(nY2>yScrn)
nY2 = yScrn;
nWidth = nX2 - nX;
nHeight = nY2 - nY;
//创建一个与屏幕设备描述表兼容的位图
hBitmap = CreateCompatibleBitmap(hSrcDC, nWidth, nHeight);
//把新位图选到内存设备描述表中
hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);
//把屏幕设备描述表拷贝到内存设备描述表中
BitBlt(hMemDC, 0, 0, nWidth, nHeight, hSrcDC, nX, nY, SRCCOPY);
//得到屏幕位图的句柄
hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);
//清除
DeleteDC(hSrcDC);
DeleteDC(hMemDC);
//返回位置句柄
return hBitmap;
}

Void CaptureScreen()
{
    int nScreenWidth = GetSystemMetrics(SM_CXSCREEN);
    int nScreenHeight = GetSystemMetrics(SM_CYSCREEN);
    HWND hDesktopWnd = GetDesktopWindow();
    HDC hDesktopDC = GetDC(hDesktopWnd);
    HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);
    HBITMAP hCaptureBitmap =CreateCompatibleBitmap(hDesktopDC,
                            nScreenWidth, nScreenHeight);
    SelectObject(hCaptureDC,hCaptureBitmap);
    BitBlt(hCaptureDC,0,0,nScreenWidth,nScreenHeight,
           hDesktopDC,0,0,SRCCOPY|CAPTUREBLT);
    SaveCapturedBitmap(hCaptureBitmap); //Place holder - Put your code
                                //here to save the captured image to disk
    ReleaseDC(hDesktopWnd,hDesktopDC);
    DeleteDC(hCaptureDC);
    DeleteObject(hCaptureBitmap);
}