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<CENTER><H3><FONT COLOR="#AOAO99">A communication class for serail port</FONT></H3></CENTER>
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This article was contributed by <A HREF="mailto:remon.spekreijse@ict.nl">Remon Spekreijse</A>.
<br>First posted: Feb,27,98
<H4>Background:</H4>
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!
<H4>Target:</H4>
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.
<H4>Usage:</H4>
In your software you only need to create an instance of the CSerialPort class
and call InitPort.
<PRE><TT><FONT COLOR="#990000">
BOOL CSerialPort::InitPort(CWnd* pPortOwner, // the owner (CWnd) of the port (receives message)
UINT portnr, // portnumber (1..4)
UINT baud, // baudrate
char parity, // parity
UINT databits, // databits
UINT stopbits, // stopbits
DWORD dwCommEvents, // EV_RXCHAR, EV_CTS etc
UINT writebuffersize) // size of the writebuffer
</FONT></TT></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 |):
<PRE><TT><FONT COLOR="#990000">
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.
</FONT></TT></PRE>
<P>Accept the first parameter all parameters are optional. The standard values are:
<PRE><TT><FONT COLOR="#990000">
portnr = 1
baud = 19200
parity = 'N'
databits = 8,
stopsbits = 1,
dwCommEvents = EV_RXCHAR | EV_CTS,
nBufferSize = 512);
</FONT></TT></PRE>
<P>So the follwing code is enough to make communication possible:
<P>in the header of the owner:
<PRE><TT><FONT COLOR="#990000">
CSerialPort m_Serial;
</FONT></TT></PRE>
<P>in the code:
<PRE><TT><FONT COLOR="#990000">
m_Serial.InitPort(this);
m_Serial.StartMonitoring();
</FONT></TT></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><TT><FONT COLOR="#990000">
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()
</FONT></TT></PRE>
and they must be handled:
<PRE><TT><FONT COLOR="#990000">
LONG CCommtestDlg::OnCommunication(WPARAM ch, LPARAM port)
{
// do something with the received character
return 0;
}
</FONT></TT></PRE>
<P>This is it for reading. Writing can be done with WriteChar or WriteToPort
<P><A HREF="commtest.zip">Download sample project</A> 66K
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