VC实现屏幕截图

HBITMAP CMyBitmapDlg::CopyScreenToBitmap(LPRECT lpRect)

{

HDC hScrDC, hMemDC;

HBITMAP hOldBitmap;

int nX, nY, nX2, nY2;

int nWidth, nHeight;

int xScrn, yScrn;

if (IsRectEmpty(lpRect))

return NULL;

hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);

hMemDC = CreateCompatibleDC(hScrDC);

nX = lpRect->left;

nY = lpRect->top;

nX2 = lpRect->right;

nY2 = lpRect->bottom;

xScrn = GetDeviceCaps(hScrDC, HORZRES);

yScrn = GetDeviceCaps(hScrDC, VERTRES);

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;

hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);

hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

ShowWindow(SW_HIDE);

BitBlt(hMemDC, 0, 0, nWidth, nHeight,hScrDC, nX, nY, SRCCOPY);

hBitmap =(HBITMAP)SelectObject(hMemDC, hOldBitmap);

DeleteDC(hScrDC);

DeleteDC(hMemDC);

ShowWindow(SW_SHOW);

return hBitmap;

}
//开始截图
void CExampleDlg::OnBtnCopyscreen()

{

CRect rc;

GetDesktopWindow()->GetWindowRect(&rc);

hBitmap=CopyScreenToBitmap(&rc);

}
//复制到剪贴板
if (OpenClipboard())

{

EmptyClipboard();

SetClipboardData(CF_BITMAP, hBitmap);

CloseClipboard();

}