From - Wed Sep 17 07:19:58 1997
From: "Sanford Hayes" <shayes@plainfield.bypass.com.SpamBlock>
Subject: Re: Serial Port Programming
Newsgroups: comp.os.ms-windows.programmer.nt.kernel-mode
References: <5vmq85$fup@epx.cis.umn.edu>
Organization: vWare Systems
Message-ID: <01bcc30b$51395660$01000064@shayes.bypass.com>
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Date: 17 Sep 97 01:44:47 GMT
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Setting up a working event driver serial port is Close to Black Magic

This is a code snippet which is from a working Initialize routine for a
serial port which uses overlapped reads & Writes

    	SetCommMask(m_hCommFile,(EV_ERR | EV_RXCHAR)) ;

	  // setup device buffers

	  SetupComm(m_hCommFile, 4096, 4096 ) ;

	  // purge any information in the buffer

	PurgeComm(m_hCommFile, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR |
PURGE_RXCLEAR ) ;

	// set up for overlapped non-blocking I/O

	m_CommTimeOuts.ReadIntervalTimeout			= 0;
	m_CommTimeOuts.ReadTotalTimeoutMultiplier		= 0 ;
	m_CommTimeOuts.ReadTotalTimeoutConstant		= 0 ;
	m_CommTimeOuts.WriteTotalTimeoutMultiplier		= 0 ;
	m_CommTimeOuts.WriteTotalTimeoutConstant 		= 5000 ;
      		
    	SetCommTimeouts(m_hCommFile,&m_CommTimeOuts ) ;

Best Regards
Sanford Hayes
vWare Systems
http://www.globalconnect.net/vware