bluetoothclient.cpp

《基于symbian os的手机开发与应用》

/**
*
* @brief Definition of CBluetoothClient
*
* Copyright (c) EMCC Software Ltd 2003
* @version 1.0
*/

// System include
#include <s32mem.h>

// User include
#include "BluetoothClient.h"
#include "BluetoothDefinitions.h"
#include "BluetoothObserver.h"

/**
* Constructor.
*
* Private - must use factory constructor
* Set observer and flag to indicate not connected
* Add this active object to the scheduler
*
* @see NewL
* @param aObserver a reference to the "mix-in" class MBluetoothObserver.
*
**/
CBluetoothClient::CBluetoothClient(MBluetoothObserver& aObserver)
: CActive(CActive::EPriorityStandard),
  iObserver(aObserver),
  iState(EDisconnected)
	{
	CActiveScheduler::Add(this);
	}

/**
* Destructor
*
* Cancel this active object, and disconnect the Client
*
**/
CBluetoothClient::~CBluetoothClient()
	{
	Cancel();
	Disconnect();
	}


/**
* Factory Constructor.
* Only available way to construct class.
* This function can leave L
*
* @see ConstructL
* @param  aObserver reference to the observer to notify
* @return new instance of the CBluetoothClient
*/
CBluetoothClient* CBluetoothClient::NewL(MBluetoothObserver& aObserver)
	{
	CBluetoothClient* self = new (ELeave) CBluetoothClient(aObserver);
	CleanupStack::PushL(self);
	self->ConstructL();
	CleanupStack::Pop(self);
	return self;
	}


/**
* Second Stage Constructor.
* This function can leave L
* @param none
* @see NewL
* @see NewLC
* @param none
* @return none
*/
void CBluetoothClient::ConstructL()
	{
	}

/**
* Disconnect when tidying up this active object.
* @param none
* @return none
**/
void CBluetoothClient::DoCancel()
	{
	Disconnect();
	}

/**
* ConnectToServerL.
* Set up Socket Address from the Bluetooth Address and Port number passed through as parameters.
* Connect to Socket Server
* Open a socket on the Server on the RFCOMM protocol (KServerTransportName)
* Issue an asynchronous Connect on the socket, utilising the remote device address information
*
* @param aBTDevAddr address of the bluetooth device to connect to.
* @param aPort the port to connect to on the device specified
* @return none
**/
void CBluetoothClient::ConnectToServerL(const TBTDevAddr& aBTDevAddr, const TInt aPort)
	{
	iState = EConnecting;

	iSocketAddress.SetBTAddr(aBTDevAddr);
	iSocketAddress.SetPort(aPort);

	User::LeaveIfError(iSocketServer.Connect());
	User::LeaveIfError(iSendingSocket.Open(iSocketServer, KServerTransportName));

	iSendingSocket.Connect(iSocketAddress, iStatus);

#ifdef __WINS__
	User::After(1); // Fix to allow emulator client to connect to server
#endif

	SetActive();
	}

/**
* SendL.
*
* Issue an asynchronous Write on the socket, passing through the message to send
*
* @param aMessage the message to send
* @return none
**/
void CBluetoothClient::Send(const TDesC& aMessage)
	{
	TRAPD(err, SendL(aMessage));
	}

void CBluetoothClient::SendL(const TDesC& aMessage)
	{
	iMessage.Zero();
	TDesBuf buffer;	
	buffer.Set (iMessage);
	
	RWriteStream stream(&buffer);
	CleanupClosePushL(stream);

	stream << aMessage;
	
	CleanupStack::PopAndDestroy();

	iState = ESendData;
	iSendingSocket.Write(iMessage, iStatus);
	SetActive();
	}

/**
* RequestData.
*
* Issue an asynchronous receive function on the socket, passing through a buffer to be populated.
*
* @param none
* @return none
**/
void CBluetoothClient::RequestData()
	{
	iMessage.Zero();

	iState = EWaitingForMessage;
	iSendingSocket.RecvOneOrMore(iMessage, 0, iStatus, iLen);
	SetActive();
	}

/**
* RunL
*
* Called when an asynchronous request completes.
* iStatus variable indicates error conditions
* iState indicates present state of the Client
*
* @param none
* @return none
**/
void CBluetoothClient::RunL()
	{
	if (iStatus.Int() == KErrNone)
		{
		switch (iState)
			{
			case EConnecting:
				{
				iObserver.ConnectedL();
				iState = EConnected;
				break;
				}

			case EWaitingForMessage:
				{
				iState = EConnected;

				TDesBuf buffer;	
				buffer.Set (iMessage);

				RReadStream stream (&buffer);
				CleanupClosePushL(stream);

				TBuf<KMaxMessageLength> rxBuf;

				stream >> rxBuf;

				CleanupStack::PopAndDestroy();
				
				iObserver.DataReceivedL(rxBuf);
				break;
				}

			case ESendData:
				{
				RequestData();
				break;
				}

			default:
				Panic(EInvalidClientState);
				break;
			}
		}
	else
		{
		Disconnect();
		iObserver.HandleErrorL(iStatus.Int());
		}
	}

/**
* Disconnect
*
* Cancel any outstanding requests.
* Close the socket
* Close the connection to the socket server
*
* @param none
* @return none
**/
void CBluetoothClient::Disconnect()
	{
	if (iState != EDisconnected)
		{
		iSendingSocket.CancelAll();
		iSendingSocket.Close();
		iSocketServer.Close();
		}

	iState = EDisconnected;
	}
/**
 * Returns connected state.
 *
 * @param none
 * @retval boolean, true if client is connected.
 */
TBool CBluetoothClient::IsConnected()
	{
	return !(iState == EDisconnected);
	}

/**
 * Returns information on connected state.
 *
 * @param none
 * @retval boolean, true if the client is connected and can send data.
 */
TBool CBluetoothClient::AvailableToSend()
	{
	return (iState == EConnected);
	}