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Check DCD(Data Carrier Detect) using MFC

Posted on 1997-09-19
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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?
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Question by:hbh
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stefanr earned 50 total points
ID: 1306594
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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