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Check DCD(Data Carrier Detect) using MFC

hbh
hbh asked
on
Medium Priority
473 Views
Last Modified: 2013-11-19
I want to check the DCD in a program which used for RS232
communication and written by MFC.
I can set DTR and RTS control via the data the structure
DCB. But there is no DCD checking parameter in DCB
structure. Can anyone tell me how to check DCD status?
Comment
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Commented:
You could user the WIN32 API function GetCommModemStatus, like this:

BOOL CComPort::GetCD() const
{
   DWORD dwModemStat = 0;

   if (!::GetCommModemStatus(m_hFile, &dwModemStat))
      TRACE("Warning: Failed to retrieve Modem Status. Error Code %lu\n", ::GetLastError());

   return (dwModemStat & MS_RLSD_ON) == MS_RLSD_ON;
}

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