C / C++ / MFC

COLORREF GetPixel(<br />
  HDC hdc,    // handle to DC<br />
  int nXPos,  // x-coordinate of pixel<br />
  int nYPos   // y-coordinate of pixel<br />
);

	CString szWndName,szWndClass;<br />
<br />
	szWndName = "My window";<br />
	szWndClass = "My window's class";<br />
<br />
	HWND hwnd = ::FindWindow(szWndName,szWndClass);<br />
<br />
	::PostMessage(hwnd,WM_PAINT,0,0);<br />
	HDC hDC = ::GetWindowDC(hwnd);<br />
<br />
	CString str;<br />
	int iPixel;<br />
<br />
	iPixel = ::GetPixel(hDC,50,75);<br />
<br />
	str.Format("%d",iPixel);<br />
	AfxMessageBox(str);