C / C++ / MFC

CDC* pDC = GetDC();
CRect rc;
GetClientRect(&ec);

// create a memdc  1.e. hMemDC
// select m_hbitmapScreenShot into it
// nGlassSize  is size of window
// nZoomLevel is zoom level to show i.e. 2

::StretchBlt(pDC->;m_hDC, 0, 0, rc.Width(), rc.Height(), m_hMemDC, nDesX, nDesY, m_nGlassSize /m_nZoomLevel,
			m_nGlassSize / m_nZoomLevel, SRCCOPY);

CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
...
	m_il1.Create(IDR_MAINFRAME1, 32, 0,RGB(128,128,128)); // Load the two toolbar bitmaps
	m_il2.Create(IDR_MAINFRAME2, 32, 0,RGB(128,128,128)); 
...
}

CMainFrame::FlashToolbarButton()
{
// Called from a windows timer
	static bool bSwap = true;
	if(bSwap)
	{
		m_wndToolBar.GetToolBarCtrl().SetImageList(&m_il1);
		bSwap = FALSE;
	}
	else
	{
		m_wndToolBar.GetToolBarCtrl().SetImageList(&m_il2);
		bSwap = TRUE;
	}
	m_wndToolBar.Invalidate(); // Needed to redraw the toolbar
}