rs232transport.cpp

Symbian OS C++ for Mobile Phones Volume 3 源码

// Copyright (c) 2004 - 2007, Symbian Software Ltd. All rights reserved.

#include "rs232transport.h"


CRs232Transport::CRs232Transport(MTransportObserver& aObserver)
/**
	This c'tor is defined to pass the supplied observer to the superclass.

	@param	aObserver		Observer to notify about transport events.
							This is managed by the CTransport superclass.
 */
:	CTransport(aObserver)
	{
	// empty.
	}

void CRs232Transport::ConstructL(
	const TDesC& aCommModuleName, const TDesC& aPortName, TBool aInitListen)
/**
	Attempt to open the described COMM port.

	@param	aCommModuleName	COMM module (CSY) to load with comms server.
	@param	aPortName		Port name to open with RComm.
	@param	aInitListen		Whether the transport should listen for an incoming payload
							after it has been created.  If false, it should wait for its
							owner to give it a payload to send.
 */
	{
	TRAN_LOG3(">CRs232Transport::ConstructL,mod=\"%S\",port=\"%S\",il=%d", &aCommModuleName, &aPortName, aInitListen);
	TInt r;

	// connect to the comms server
	r = iCommServ.Connect();
	TRAN_LOG1("-CRs232Transport::ConstructL,conn=%d", r);
	if (r == KErrNone)
		r = iCommServ.LoadCommModule(aCommModuleName);
	TRAN_LOG1("-CRs232Transport::ConstructL,loadmod=%d", r);

	if (r == KErrNone)
		r = iComm.Open(iCommServ, aPortName, ECommExclusive, ECommRoleDTE);
	TRAN_LOG1("-CRs232Transport::ConstructL,open=%d", r);
	
	TCommConfig ccPckg;
	if (r == KErrNone)
		r = iComm.Config(ccPckg);
	TRAN_LOG1("-CRs232Transport::ConstructL,getconfig=%d", r);
	
	if (r == KErrNone)
		{
		TCommConfigV01& cc = ccPckg();
		cc.iRate = EBps9600;
		r = iComm.SetConfig(ccPckg);
		}
	TRAN_LOG1("-CRs232Transport::ConstructL,setconfig=%d", r);

	User::LeaveIfError(r);
	CTransport::ConstructL(aInitListen);

	TRAN_LOG0("<CRs232Transport::ConstructL");
	}

CRs232Transport::~CRs232Transport()
/**
	Cancel any outstanding operations; close the connection
	with the remote device, and free any resources used by
	this transport.
 */
	{
	FreeResources();
	}

void CRs232Transport::FreeResources()
/**
	Cancel any outstanding operations; close the comm
	subsession, and close the session to the comms server.

	This functionality is provided separately to the
	destructor in a derived class can call it before
	freeing its own resources.

	This function can safely be called multiple times.
 */
	{
	Cancel();

	iComm.Close();
	iCommServ.Close();		// unloads comm module
	}


// -------- implement CTransport --------

void CRs232Transport::DoSendPayloadL()
/**
	Implement CTransport by sending the supplied payload
	to the remote device.
 */
	{
	iPayload8.Copy(iPayload);
	iComm.Write(iStatus, iPayload8);
	// SetActive is called by CTransport::SendPayload
	}

void CRs232Transport::DoLaunchRead()
/**
	Implement CTransport by waiting for an incoming payload.
 */
	{
	iComm.Read(iStatus, iPayload8);
	// SetActive is called by CTransport::LaunchRead
	}


// -------- implement CActive, override CTransport --------

void CRs232Transport::RunL()
/**
	Implement CActive and override CTransport by copying
	the received data into iPayload, widening the text.
 */
	{
	// if successful read then widen into iPayload
	if (iStatus == KErrNone && iListening)
		iPayload.Copy(iPayload8);
	
	CTransport::RunL();
	}

void CRs232Transport::DoCancel()
/**
	Implement CActive by cancelling any outstanding read or write.
 */
	{
	iComm.Cancel();
	}