抓屏获取QQ窗口的方法

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用拷贝桌面HDC的方法抓不到QQ窗口，经试验，用键盘Print Screen键是可以抓到QQ窗口的，因此用以下方法抓屏:

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HBITMAP copyBitmap(HBITMAP hSourceHbitmap)
{
	CDC sourceDC;
	CDC destDC;
	sourceDC.CreateCompatibleDC(NULL);
	destDC.CreateCompatibleDC(NULL);
	BITMAP bm = { 0 };
	::GetObject(hSourceHbitmap, sizeof(bm), &bm);
 
	HBITMAP hbmResult = ::CreateCompatibleBitmap(CClientDC(NULL), bm.bmWidth, bm.bmHeight);
 
	HBITMAP hbmOldSource = (HBITMAP)::SelectObject(sourceDC.m_hDC, hSourceHbitmap);
	HBITMAP hbmOldDest = (HBITMAP)::SelectObject(destDC.m_hDC, hbmResult);
	destDC.BitBlt(0, 0, bm.bmWidth, bm.bmHeight, &sourceDC, 0, 0, SRCCOPY);
 
	::SelectObject(sourceDC.m_hDC, hbmOldSource);
	::SelectObject(destDC.m_hDC, hbmOldDest);
	::DeleteObject(sourceDC.m_hDC);
	::DeleteObject(destDC.m_hDC);
 
	return hbmResult;
}
 
HBITMAP CSnapDlg::CaptureScreen()
{
	keybd_event((byte)0x2c, 0, 0x0, NULL);    //down
	keybd_event((byte)0x2c, 0, 0x2, NULL);    //up
	Sleep(500);
 
	HBITMAP hBitmap = NULL;
	if (OpenClipboard())
	{
		HBITMAP handle = (HBITMAP)GetClipboardData(CF_BITMAP);
		hBitmap = copyBitmap(handle);
 
		CloseClipboard();
	}
	return hBitmap;
}

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