C / C++ / MFC

<br />
CWnd* pWnd = GetDlgItem(IDNAME);<br />
CDC* pControlDC = pWnd->GetDC();<br />
<br />
pWnd->Invalidate();<br />
pWnd->UpdateWindow();<br />
<br />
//do painting here.<br />
pWnd->ReleaseDC(pControlDC);<br />

POSITION pos = pList->GetFirstSelectedItemPosition();
if (pos != NULL)
   while (pos)
      nItem = pList->GetNextSelectedItem(pos);

bool CSerial4::OpenPort(int port)<br />
{<br />
	if(port<1) <br />
	{<br />
		m_sError=_T("Illegal port number");<br />
		m_iPort=0;<br />
		return false;<br />
	}<br />
	if(m_hPort!=INVALID_HANDLE_VALUE)<br />
	{<br />
		return true;<br />
	}<br />
	else<br />
	{<br />
		char strPort[15];<br />
		sprintf(strPort,"\\\\.\\COM%d",port);<br />
		m_hPort = ::CreateFile(strPort,<br />
			GENERIC_READ|GENERIC_WRITE,//access ( read and write)<br />
			0,    //(share) 0:cannot share the COM port                        <br />
			0,    //security  (None)                <br />
			OPEN_EXISTING,// creation : open_existing<br />
			FILE_FLAG_OVERLAPPED,// we want overlapped operation<br />
			0// no templates file for COM port...<br />
			);<br />
		if(m_hPort==INVALID_HANDLE_VALUE )<br />
		{<br />
			m_sError.Format("CommError(%d)",GetLastError());<br />
			return false;<br />
		}<br />
		DCB dcb = {0};<br />
		dcb.DCBlength = sizeof(DCB);<br />
<br />
		if (!::GetCommState (m_hPort,&dcb))<br />
		{<br />
			m_sError.Format("GetCommState: CommError(%d)",GetLastError());<br />
			return false;<br />
		}<br />
<br />
		dcb.fRtsControl	= RTS_CONTROL_ENABLE;<br />
		dcb.fDtrControl	= DTR_CONTROL_ENABLE;<br />
		dcb.BaudRate    = CBR_9600;<br />
		dcb.ByteSize    = 8;<br />
		dcb.Parity      = NOPARITY;<br />
		dcb.StopBits    = ONESTOPBIT;// ONESTOPBIT/ONE5STOPBITS/TWOSTOPBITS 0/1/2<br />
		dcb.EvtChar		= 10;<br />
		dcb.XoffChar	= 19;<br />
		dcb.XoffLim		= 512;<br />
		dcb.XonChar		= 17;<br />
		dcb.XonLim		= 2048;<br />
<br />
<br />
		if (!::SetCommState (m_hPort,&dcb))<br />
		{<br />
			m_sError.Format("SetCommState: CommError(%d)", GetLastError());<br />
			return false;<br />
		}<br />
<br />
		COMMTIMEOUTS timeouts;<br />
		timeouts.ReadIntervalTimeout		= MAXDWORD; <br />
		timeouts.ReadTotalTimeoutMultiplier	= 0;<br />
		timeouts.ReadTotalTimeoutConstant	= 0;<br />
		timeouts.WriteTotalTimeoutMultiplier= 0;<br />
		timeouts.WriteTotalTimeoutConstant	= 0;<br />
<br />
		if (!SetCommTimeouts(m_hPort, &timeouts))<br />
		{<br />
			m_sError.Format("SetCommTimeouts: CommError(%d)",GetLastError());<br />
			return false;<br />
		}<br />
<br />
		DWORD flags=0;<br />
		flags|=EV_RXFLAG;//EV_TXEMPTY|<br />
		if (!::SetCommMask(m_hPort,flags))<br />
		{<br />
			m_sError.Format("SetCommMask: CommError(%d)",GetLastError());<br />
			return false;<br />
		}<br />
<br />
		return true;		//return true;<br />
	}<br />
}<br />
<br />
<br />
bool CSerial4::Request(CString in, CString &out)<br />
{<br />
	DWORD dwSize=in.GetLength();<br />
	DWORD dwBytesWritten=0;<br />
	DWORD dwRead;<br />
	DWORD dwMask;<br />
	char *psp=m_data;<br />
	psp[0]=0;<br />
<br />
	OVERLAPPED ovRead;	<br />
    memset(&ovRead,0,sizeof(OVERLAPPED));<br />
	ovRead.hEvent=::CreateEvent(0,1,0,0); <br />
<br />
	OVERLAPPED ovWrite;	<br />
    memset(&ovWrite,0,sizeof(OVERLAPPED));<br />
//	ovWrite.hEvent=::CreateEvent(0,1,0,0); <br />
<br />
	char* pin=new char[dwSize+1];<br />
	strcpy(pin,in);<br />
	::PurgeComm(m_hPort,PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);<br />
	if(!::WriteFile (m_hPort,pin,dwSize,&dwBytesWritten ,&ovWrite))<br />
	{<br />
		m_sError.Format("Write Failed: CommError(%d)",GetLastError());<br />
//		m_sError.Format("Write Failed: CommError(%d)",GetLastError());<br />
//		m_debugError.Format("0x%8.8x %d %d %d %d",ov.hEvent,ov.Internal,ov.InternalHigh,ov.Offset,ov.OffsetHigh);<br />
		::CloseHandle(ovWrite.hEvent);<br />
		return false;<br />
	}<br />
...<br />
..<br />
.<br />

STARTUPINFO si = { sizeof(STARTUPINFO) };   PROCESS_INFORMATION pi;     // Create the process   if (!::CreateProcess(NULL, "your.exe", NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi)) {       AfxMessageBox("Error starting the process!");       return; }   // Wait till it ends    ::WaitForSingleObject(pi.hProcess, INFINITE);   // Clean up ::CloseHandle(pi.hProcess); ::CloseHandle(pi.hThread);

int main( int argc, char* argv[] )
{
	HANDLE h = ::FindFirstChangeNotification( "d:\\test\\magnus", FALSE, FILE_NOTIFY_CHANGE_FILE_NAME );
	if( h == INVALID_HANDLE_VALUE )
	{
		std::cout << "Error on FFCN: " << ::GetLastError() << std::endl;
		return 0;
	}


	std::cout << "Entering loop" << std::endl;

	for( ;; )
	{
		DWORD dwWaitState = ::WaitForSingleObject( h, INFINITE );
		switch( dwWaitState )
		{
		case WAIT_OBJECT_0:
			std::cout << "Something happened" << std::endl;
			break;
		case WAIT_ABANDONED:
			std::cout << "Error WAIT_ABANDONED" << std::endl;
			break;
		case WAIT_TIMEOUT:
			std::cout << "Error WAIT_TIMEOUT" << std::endl;
			break;
		default:
			std::cout << "Error DEFAULT" << std::endl;
			break;
		}

		if( dwWaitState != WAIT_OBJECT_0 )
			break;

		if( ::FindNextChangeNotification( h ) == 0 )
		{
			std::cout << "Error on FNCN: " << ::GetLastError() << std::endl;
			break;
		}
	}

	::FindCloseChangeNotification( h );
	return 0;
}