The dwCommEvents flag can be used for communication with the owner of this class.

The flags can be one of the following (or combined with |):

• WM_COMM_BREAK_DETECTED A break was detected on input.
• WM_COMM_CTS_DETECTED The CTS (clear-to-send) signal changed state.
• WM_COMM_DSR_DETECTED The DSR (data-set-ready) signal changed state.
• WM_COMM_ERR_DETECTED A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY.
• WM_COMM_RING_DETECTED A ring indicator was detected.
• WM_COMM_RLSD_DETECTED The RLSD (receive-line-signal-detect) signal changed state.
• WM_COMM_RXCHAR A character was received and placed in the input buffer.
• WM_COMM_RXFLAG_DETECTED The event character was received and placed in the input buffer.

Accept the first parameter all parameters are optional. The standard values are:

portnr  = 1
baud  = 19200
parity  = 'N'
databits  = 8,
stopsbits = 1,
dwCommEvents = EV_RXCHAR | EV_CTS,
nBufferSize = 512);

So the follwing code is enough to make communication possible:

in the header of the owner:

 CSerialPort m_Serial;

in the code:

 m_Serial.InitPort(this);
 m_Serial.StartMonitoring();

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:

BEGIN_MESSAGE_MAP(CCommtestDlg, CDialog)
 //{{AFX_MSG_MAP(CCommtestDlg)
 ON_MESSAGE(WM_COMM_RXCHAR, OnCommunication)
 ON_MESSAGE(WM_COMM_CTS_DETECTED, OnCTSDetected)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

LONG CCommtestDlg::OnCommunication(WPARAM ch, LPARAM port)
{
 // do something with the received character

 return 0;
}

This is it for reading. Writing can be done with WriteChar or WriteToPort

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