C / C++ / MFC

int count = 0;
void CMonitorTestDlg::OnBnClickedButtonFlashAll()
{
	CMonitor monitor;
	CMonitors monitors;

	CString cstr[2];
	

	for ( int i = 0; i < monitors.GetCount(); i++ )
	{		
		count = i+1;
		monitor = monitors.GetMonitor( i );
		FlashMonitor( monitor);
		Sleep( 500 );
	}
}
void CMonitorTestDlg::FlashMonitor( CMonitor& monitor, bool WorkSpace)
{
	CRect rect;

	if ( WorkSpace )
		//get the work area rect of the monitor this window is on
		monitor.GetWorkAreaRect( &rect );
	else
		monitor.GetMonitorRect( &rect );

	CMonitorDC dc( &monitor );
	
	if(count ==1)
	{
		// create and select a solid blue brush
		CBrush brushBlue(RGB(0, 255, 0));
		CBrush* pOldBrush = dc.SelectObject(&brushBlue);
						
		rect.DeflateRect(200,200);
		dc.Rectangle(&rect);

		COLORREF clr1 = RGB(0,0,0);
		dc.SetTextColor(clr1);
		dc.DrawText("Primary Monitor",17,&rect,1);

		// put back the old objects
		dc.SelectObject(pOldBrush);		
	}
	else
	{

		// create and select a solid blue brush
		/*CBrush brushBlue(RGB(0, 0, 255));
		CBrush* pOldBrush = dc.SelectObject(&brushBlue);
						
		rect.DeflateRect(200,200);
		dc.Rectangle(&rect);

		COLORREF clr1 = RGB(0,0,0);
		dc.SetTextColor(clr1);
		dc.DrawText("Secondary Monitor",17,&rect,1);

		// put back the old objects
		dc.SelectObject(pOldBrush);*/

                /*How can i send a bitmap image or a image buffer to second
                monitor.I have tried to use Bltblt but create compatibleDc
                need a CDC object not the CMonitor dc.*/
	}

	Sleep( 2000 );

	::InvalidateRect( NULL, &rect, TRUE );
}

// load IDB_BITMAP1 from our resources
CBitmap bmp;
if (bmp.LoadBitmap(IDB_BITMAP1))
{
                 // Get the size of the bitmap
                 BITMAP bmpInfo;
		  bmp.GetBitmap(&bmpInfo);		  

		  // Create an in-memory DC compatible with the
		  // display DC we're using to paint				  

		  CDC dcMemory;
		  //dcMemory.CreateCompatibleDC(dc);	// Cant do this CMonitorDC * to CDC *  

		  // Select the bitmap into the in-memory DC
		  CBitmap* pOldBitmap = dcMemory.SelectObject(&bmp);

		  // Find a centerpoint for the bitmap in the client area
		  CRect rect1;
		  GetClientRect(&rect1);
		  int nX = rect.left + (rect1.Width() - bmpInfo.bmWidth) / 2;
		  int nY = rect.top + (rect1.Height() - bmpInfo.bmHeight) / 2;

		  // Copy the bits from the in-memory DC into the on-
		  // screen DC to actually do the painting. Use the centerpoint
		  // we computed for the target offset.
		  dc.BitBlt(nX, nY, bmpInfo.bmWidth, bmpInfo.bmHeight, &dcMemory, 
			 0, 0, SRCCOPY);

		  dcMemory.SelectObject(pOldBitmap);
}

CCriticalSection mySection;<br />
<br />
mySection.Lock();<br />
....<br />
mySection.Unlock();

<br />
CCriticalSection mySection<br />
CSingleLock  myLock(&mySection);<br />
<br />
myLock.Lock();<br />
....<br />
myLock.Unlock();