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      <H3><FONT color=#a0a099>A Communication Class for Serial Port 
      </FONT></H3></CENTER>
      <HR>
      This article was contributed by <A 
      href="mailto:[e-mail]">Remon Spekreijse</A>. 
      <H3>Background:</H3>I've searched for a good communication class for a 
      while and could not find one. That's when I decided to write my own and it 
      should be one that's easy to use. 
      <P>In the newgroups there are many questions about serial communication so 
      I thought: make it public! It's freeware. The only thing I expect from 
      users is that they drop me a mail. All modifications on this class are 
      free, but please let me know if it solves a bug or adds some good 
      features. Also comment your code and don't let me solve your bugs! 
      <H3>Target:</H3>The class is not intended to use as a baseclass for 
      modemcommunication but more for driving hardware or reading hardware via 
      the serial port. 
      <P>From the classes included there is only one class important: 
      CSerialPort. The other classes are only there to illustrate the use of 
      this class. 
      <H3>Usage:</H3>In your software you only need to create an instance of the 
      CSerialPort class and call InitPort. <PRE><FONT color=#008000>// the owner (CWnd) of the port (receives message)</FONT>

BOOL CSerialPort::InitPort(CWnd* pPortOwner,  
 UINT  portnr,   <FONT color=#008000>// portnumber (1..4)</FONT>
 UINT  baud,    <FONT color=#008000>// baudrate</FONT>
 char  parity,   <FONT color=#008000>// parity </FONT>
 UINT  databits,   <FONT color=#008000>// databits </FONT>
 UINT  stopbits,   <FONT color=#008000>// stopbits </FONT>
 DWORD dwCommEvents,  <FONT color=#008000>// EV_RXCHAR, EV_CTS etc</FONT>
 UINT  writebuffersize) <FONT color=#008000>// size of the writebuffer</FONT>
</PRE>
      <P>The dwCommEvents flag can be used for communication with the owner of 
      this class. 
      <P>The flags can be one of the following (or combined with |): 
      <UL>
        <LI>WM_COMM_BREAK_DETECTED A break was detected on input. 
        <LI>WM_COMM_CTS_DETECTED The CTS (clear-to-send) signal changed state. 
        <LI>WM_COMM_DSR_DETECTED The DSR (data-set-ready) signal changed state. 
        <LI>WM_COMM_ERR_DETECTED A line-status error occurred. Line-status 
        errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY. 
        <LI>WM_COMM_RING_DETECTED A ring indicator was detected. 
        <LI>WM_COMM_RLSD_DETECTED The RLSD (receive-line-signal-detect) signal 
        changed state. 
        <LI>WM_COMM_RXCHAR A character was received and placed in the input 
        buffer. 
        <LI>WM_COMM_RXFLAG_DETECTED The event character was received and placed 
        in the input buffer. </LI></UL>
      <P>Accept the first parameter all parameters are optional. The standard 
      values are: <PRE>portnr  = 1
baud  = 19200
parity  = 'N'
databits  = 8, 
stopsbits = 1, 
dwCommEvents = EV_RXCHAR | EV_CTS,
nBufferSize = 512);
</PRE>
      <P>So the follwing code is enough to make communication possible: 
      <P>in the header of the owner: <PRE> CSerialPort m_Serial;
</PRE>
      <P>in the code: <PRE> m_Serial.InitPort(this);
 m_Serial.StartMonitoring();
</PRE>
      <P>Then the tread that watches the port is started and all events on the 
      port are send to the owner. The receive a character the owner needs a 
      messageentry in the messagemap: <PRE>BEGIN_MESSAGE_MAP(CCommtestDlg, CDialog)
 <FONT color=#008000>//{{AFX_MSG_MAP(CCommtestDlg)</FONT>
 ON_MESSAGE(WM_COMM_RXCHAR, OnCommunication)
 ON_MESSAGE(WM_COMM_CTS_DETECTED, OnCTSDetected)
 <FONT color=#008000>//}}AFX_MSG_MAP</FONT>
END_MESSAGE_MAP()
</PRE>and they must be handled: <PRE>LONG CCommtestDlg::OnCommunication(WPARAM ch, LPARAM port)
{
 <FONT color=#008000>// do something with the received character</FONT>

 return 0;
}
</PRE>
      <P>This is it for reading. Writing can be done with WriteChar or 
      WriteToPort 
      <H3>Downloads</H3><A 
      href="http://www.codeguru.com/network/serialport_demo.zip">Download sample 
      project - 66K</A> 
      <H3>History</H3>Date Posted: February 27, 1998<BR><!--comments-->
      <H3>Comments:</H3>
      <UL><!--startlist-->
        <LI><A 
        href="http://www.codeguru.com/mfc/comments/31593.shtml">Handshaking</A> 
        - Fred (2002/01/10) 
        <LI><A href="http://www.codeguru.com/mfc/comments/31592.shtml">please 
        help me</A> - nurul (2002/01/10) 
        <LI><A href="http://www.codeguru.com/mfc/comments/30377.shtml">I cannot 
        shutdown port correctly! URGENT!</A> - pine Tan (2001/12/18) 
        <LI><A href="http://www.codeguru.com/mfc/comments/30044.shtml">How To 
        send &lt;Ctrl&gt;+&lt;Z&gt; to Serial Port </A>- ZYX (2001/12/05) 
        <LI><A href="http://www.codeguru.com/mfc/comments/30041.shtml">RECEIVING 
        SERIAL DATA(SETTING COM TIMEOUTS)URGENT</A> - BAMZAI (2001/12/04) 
        <LI><A href="http://www.codeguru.com/mfc/comments/29918.shtml">A way to