bluetoothserver.cpp

《基于symbian os的手机开发与应用》

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

// System include
#include <bt_sock.h>
#include <s32mem.h>

// User include
#include "BluetoothServer.h"
#include "BluetoothAdvertiser.h"
#include "BluetoothChatApplication.h"

/**
* Constructor.
*
* Set observer and flag to indicate not connected
* Add this active object to the scheduler
*
* @param aObserver reference to MBluetoothObserver
**/
CBluetoothServer::CBluetoothServer(MBluetoothObserver& aObserver)
: CActive(CActive::EPriorityStandard),
  iObserver(aObserver),
  iState(EDisconnected)
	{
	CActiveScheduler::Add(this);
	}

/**
* Factory Constructor.
* Only available way to construct class.
* This function can leave L
* @param none
* @return new instance of the CBluetoothServer
*/
CBluetoothServer* CBluetoothServer::NewL(MBluetoothObserver& aObserver)
	{
	CBluetoothServer* self = NewLC(aObserver);
	CleanupStack::Pop(self);
	return self;
	}

/**
* Factory Constructor.
* Only available way to construct class.
* This function can leave L, returning value is on Cleanup Stack C
* @param none
* @return new instance of the CBluetoothServer on Cleanup stack
*/
CBluetoothServer* CBluetoothServer::NewLC(MBluetoothObserver& aObserver)
	{
	CBluetoothServer* self = new (ELeave) CBluetoothServer(aObserver);
	CleanupStack::PushL(self);
	self->ConstructL();
	return self;
	}

/**
* Destructor.
*
* Cancel this active object, and disconnect the Server
* Delete the advertiser
*
* @param none
* @retval none
**/
CBluetoothServer::~CBluetoothServer()
	{
	TRAPD(err,StopL());
    // Panic in debug if this didn't work
    __ASSERT_DEBUG(err == KErrNone, Panic(EErrorStoppingServer));

	Cancel();

	// Close handles
	if (iSecSettingsSession.SubSessionHandle() != 0)
		{
		iSecSettingsSession.Close();
		}
	if (iSecManager.Handle() != 0)
		{
		iSecManager.Close();
		}
	if (iAcceptedSocket.SubSessionHandle() != 0)
		{
		iAcceptedSocket.Close();
		}
	if (iListeningSocket.SubSessionHandle() != 0)
		{
		iListeningSocket.Close();
		}
	if (iSocketServer.Handle() != 0)
		{
		iSocketServer.Close();
		}

	delete iAdvertiser;
	}

/**
* ConstructL
*
* Create the advertiser
*
* @see NewL
* @see NewLC
* @param none
* @return none
**/
void CBluetoothServer::ConstructL()
	{
	iAdvertiser = CBluetoothAdvertiser::NewL();
	}

void CBluetoothServer::DoCancel()
	{
	switch(iState)
		{
		case EDisconnected :
			{
			break;
			}
		case ESettingSecurity :
			{
			iSecSettingsSession.CancelRequest(iStatus);	// not asynch call
			break;
			}
		case EConnecting :
			{
			iListeningSocket.CancelAccept();
			break;
			}
		case EConnected :
			{
			break;
			}
		case EWaitingForMessage :
			{
			iAcceptedSocket.CancelRecv();
			break;
			}
		case ESendData :
			{
			iAcceptedSocket.CancelSend();
			break;
			}
		default:
			{
			break;
			}
		}
	}

/**
* StartServerL.
*
* Connect to Socket Server
* Open a listening socket on the Server on the RFCOMM protocol (KServerTransportName)
* Get a channel to listen on
* Bind the socket to this port, and listen
* Open another socket on the Server
* Issue an asynchronous Accept on the listening socket, passing through the AcceptedSocket
* When the Accept completes the Accepted Socket may be utilised for communication and the listening socket will continue
* listening for connections.
* Set Security options on the Port/Channel
*
* @param none
* @return none
**/
void CBluetoothServer::StartServerL()
	{
	if (iState != EDisconnected)
		{
		User::Leave(KErrInUse);
		}

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

	// Get a channel to listen on - same as the socket's port number
	User::LeaveIfError(iListeningSocket.GetOpt(KRFCOMMGetAvailableServerChannel, KSolBtRFCOMM, iChannel));

	TBTSockAddr listeningAddress;
	listeningAddress.SetPort(iChannel);

	User::LeaveIfError(iListeningSocket.Bind(listeningAddress));
	User::LeaveIfError(iListeningSocket.Listen(KListeningQueSize));

	SetSecurityOnChannelL(EFalse, EFalse, ETrue);
	}

/**
* SetSecurityOnChannelL.
*
* Connect to security manager
* Open a subsession on the security manager used to register settings
* Build the security settings within a TBTServiceSecurity object
* Register these settings
*
* @param aAuthentication true if you wish to enforce authentication
* @param aEncryption true if you wish to enforce encryption on the incomming data
* @param eAuthorisation true if you wish to enforce authorisation.
* @return none
**/
void CBluetoothServer::SetSecurityOnChannelL(TBool aAuthentication, TBool aEncryption, TBool aAuthorisation)
	{
	// connect to the security manager and open a settings session.
	User::LeaveIfError(iSecManager.Connect());
	User::LeaveIfError(iSecSettingsSession.Open(iSecManager));

	// the security settings
	TBTServiceSecurity serviceSecurity(KUidBluetoothChat, KSolBtRFCOMM, 0);

	//Define security requirements
	serviceSecurity.SetAuthentication(aAuthentication);
	serviceSecurity.SetEncryption(aEncryption);
	serviceSecurity.SetAuthorisation(aAuthorisation);

	serviceSecurity.SetChannelID(iChannel);

	// make asynch request
	iSecSettingsSession.RegisterService(serviceSecurity, iStatus);
	iState = ESettingSecurity;
	SetActive();
	}


/**
* AcceptConnectionsL.
*
* Sets the socket which should be used to accept incoming connections at the
* listening socket.
*
* @param none
* @return none
**/
void CBluetoothServer::AcceptConnectionsL()
	{
	iAcceptedSocket.Close();	// close old connection - if any
	User::LeaveIfError(iAcceptedSocket.Open(iSocketServer));	// Open abstract socket

	iState = EConnecting;

	// set the listening socket to accept new connections on
	// the accepted socket.
	iListeningSocket.Accept(iAcceptedSocket, iStatus);

	SetActive();

	// notify the observer that the server has started
	iObserver.ServerStartedL();
	}

/**
* StartAdvertisingL.
*
* Start Advertising
*
* @param none
* @return none
**/
void CBluetoothServer::StartAdvertisingL()
	{
	iAdvertiser->StartAdvertisingL(iChannel);
	iAdvertiser->UpdateAvailabilityL(ETrue);
	}

/**
* StopL.
*
* Stop Advertising
* Close the communication socket
* Close the listening socket
* Close the connection to the socket server
*
* @param none
* @return none
**/
void CBluetoothServer::StopL()
	{
	if (iState != EDisconnected)
		{
		if (iAdvertiser->IsAdvertising())
			{
			iAdvertiser->StopAdvertisingL();
			}

		iAcceptedSocket.Close();
		iListeningSocket.Close();
		iSocketServer.Close();
		}

	iState = EDisconnected;
	}

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

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

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

	iState = ESendData;
	iAcceptedSocket.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 CBluetoothServer::RequestData()
	{
	iMessage.Zero();

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

/**
* RunL
*
* Called when an asynchronous request completes.
* iStatus variable indicates error conditions
* iState indicates present state of the Server
*
* @param none
* @return none
**/
void CBluetoothServer::RunL()
	{
	if (iStatus.Int() == KErrNone)
		{
		switch (iState)
			{
			case ESettingSecurity :
				{
				// cleanup after security settings
				iSecSettingsSession.Close();
				iSecManager.Close();

				// accept connections
				AcceptConnectionsL();
				break;
				}
			case EConnecting:
				{
				iObserver.ConnectedL();
				// do not accept any more connections
				iAdvertiser->StopAdvertisingL();
				RequestData();
				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(EInvalidServerState);
				break;
			}
		}
	else
		{
		StopL();
		iObserver.HandleErrorL(iStatus.Int());
		}
	}

/**
 * Returns information on state of the Bluetooth Server.
 *
 * @param none
 * @returns boolean, true if the server is connected to a client, false otherwise
 */
TBool CBluetoothServer::IsConnected()
	{
	return !(iState == EDisconnected);
	}

/**
 * Returns information on state of the Bluetooth Server.
 *
 * @param none
 * @returns boolean, true if the server is able to send data to the client, false otherwise
 */
TBool CBluetoothServer::AvailableToSend()
	{
	return (iState == EConnected);
	}