gdpbt.cpp

《SymbianOSC手机应用开发》源码

// gdpbt.cpp
//
// Bluetooth implentation of GDP
//
// Copyright (c) 2000-2002 Symbian Ltd.  All rights reserved

#include <btmanclient.h>
#include <gdp.h>
#include "gdpbt.h"
#include <ImplementationProxy.h>
#include <ecom.h>


// Beep then wait a second before carrying on...
#define HIGHBEEP //User::Beep(990,250000); User::After(2000000);
#define BEEP //User::Beep(330,250000); User::After(2000000);
#define SLOW_DEBUG_PRINT(text) //User::InfoPrint(text); User::After(2000000);
#define DEBUG_PRINT(text) //User::InfoPrint(text); User::After(500000);

/**************** GdpBTComms ****************/

CGdpBTComms::CGdpBTComms()
	{
	}

CGdpBTComms::~CGdpBTComms()
	{
	REComSession::DestroyedImplementation(iDtor_ID_Key);
		// Delete all the things we created in OpenL()
	delete iSender;
	delete iReceiver;
	delete iResMan;
	}

CGdpSession* CGdpBTComms::NewL()
	{
	return new (ELeave) CGdpBTComms();
	}


void CGdpBTComms::OpenL(MGdpPacketHandler* aHandler)
	{
DEBUG_PRINT(_L("Entering CGdpBTComms::OpenL"));
	// Make sure we haven't already got a sender; if we do, Panic!
	__ASSERT_ALWAYS(iSender == NULL, GdpUtil::Fault(GdpUtil::EProtocolAlreadyOpen));
	// Create a new Resource manager...
	iResMan = new(ELeave) CGdpBTResourceManager();
	// ...and open it - no params, it just stores info for us
	// 5 beeps in here
	iResMan->OpenL(); 
BEEP
	// Create a new Sender...
	iSender = new(ELeave) CGdpBTSender(*iResMan);
	// ...and open it - no params as it just sends whatever is passed to it
BEEP
	iSender->OpenL(*aHandler);	//Inform handler of successful send
BEEP
	// Create a new Receiver...
	iReceiver = new(ELeave) CGdpBTReceiver(*iResMan);
	// ...and open it - needs to know where to put packets it receives
BEEP
	iReceiver->OpenL(*aHandler);	// route packets up to the handler passed to us
BEEP
DEBUG_PRINT(_L("Leaving CGdpBTComms::OpenL"));
	}


void CGdpBTComms::SendL(const TDesC8& aToAddress, const TDesC8& aData)
// Sends info received from GSDP out to the other Bluetooth device
// specified by the address passed in
	{
	//Make sure we've got the sender set up before we use it...
	__ASSERT_ALWAYS(iSender != NULL, GdpUtil::Fault(GdpUtil::EProtocolNotOpen));
	//...to send the message to the specified address
	iSender->SendL(aToAddress, aData);
	}

TInt CGdpBTComms::ReceiveAll()
//
// Do Nothing! IR uses async. notifications to receive
//
	{
	// Make sure we've got a receiver - is this neccessaruy??? doesn't hurt...
	__ASSERT_ALWAYS(iReceiver != NULL, GdpUtil::Fault(GdpUtil::EProtocolNotOpen));
	return KErrNone;
	}

TInt CGdpBTComms::GetMaxPacketLength() const
	{
	return KGdpBTMaxPacketLength;
	// We should check LMP frame size, if there
	// were any chance we would otherwise exceed it.
	}

TBool CGdpBTComms::IsNetworked() const
	{
	return ETrue; // Uses addressing so is in effect, networked
	}


/**************** GdpBTStateMachine ****************/

CGdpBTStateMachine::CGdpBTStateMachine(CGdpBTResourceManager& aResMan)
: CGdpStateMachine(EPriorityStandard), iResMan(aResMan)	
	{
	}


/**************** GdpBTSender ****************/

#pragma warning(disable:4355) // Disable "C4355: 'this' used in member initialization". 

CGdpBTSender::CGdpBTSender(CGdpBTResourceManager& aResMan)
	// Initialise the parent state machine
	: CGdpBTStateMachine(aResMan),
	// Make sure our member states know who owns them
	iConnectState(*this),
	iWriteState(*this)
	{
	}

#pragma warning(default:4355) // Turn C4355 back on.

CGdpBTSender::~CGdpBTSender()
	{
	// Close everything down before we die
DEBUG_PRINT(_L("Entering CGdpBTSender::~CGdpBTSender"));
	Close();
DEBUG_PRINT(_L("Leaving CGdpBTSender::~CGdpBTSender"));
	}

void CGdpBTSender::OpenL(MGdpPacketHandler& aHandler)
	{
DEBUG_PRINT(_L("Entering CGdpBTSender::OpenL"));
	// Just reset ourselves, the state machine will take care of the rest
	iHandler = &aHandler;
	Reset();
DEBUG_PRINT(_L("Leaving CGdpBTSender::OpenL"));
	}

void CGdpBTSender::Close()
	{
	// Cancel any outstanding requests...
	Cancel();
	// ...and then close the socket down
	iWriteSocket.Close();
	}

void CGdpBTSender::SendL(const TDesC8& aAddress, const TDesC8& aData)
	{

	TLex8 lex(aAddress);
	lex.Mark();
	if (!(lex.Get() == '0' && lex.Get() == 'x'))
		lex.UnGetToMark();

	TInt64 addr;
	User::LeaveIfError(lex.Val(addr, EHex));
	
	iAddr.SetBTAddr(TBTDevAddr(addr));

	// Check the size of the data we're trying to send:
	//   - if it's bigger than the maximum we can store in our member 
	//     variable then call GdpUtil::Fault()
	__ASSERT_ALWAYS(aData.Size() <= iPacket.MaxSize(), GdpUtil::Fault(GdpUtil::EBadSendDescriptor));
	// If the current state is NULL then panic as we're not ready
	__ASSERT_DEBUG(CurrentState() != NULL, GdpUtil::Panic(GdpUtil::ESenderNotReady));
	// If we're already waiting for another packet to be sent, we can't 
	// send another one but we don't leave, we just quietly drop the
	// overflow packet and quit this send
	if (IsActive())
		return;	
	// We're still here so it's OK to send the packet.
	iPacket.Copy(aData); // Buffer packet until needed
	// Set the number of retries to the maximum allowed
	iRetries = KGdpBTSendRetries;
	ReEnterCurrentState(); // Kick us off again but remain connected...
	}

CGdpStateMachine::TState* CGdpBTSender::ErrorOnStateEntry(TInt /*aError*/)
//
// Failed to init a request. Can't really help it: Give up!
//
	{
	Reset();
	return NULL; // Give up
	}

CGdpStateMachine::TState* CGdpBTSender::ErrorOnStateExit(TInt /*aError*/)
//
// Request failed -- reset and re-enter current state if appropriate, 
// decrementing number of retries so we don't continuously retry
//
	{
	Reset();
	if (--iRetries < 0)
		return NULL;
	return CurrentState();
	}

void CGdpBTSender::Reset()
	{
DEBUG_PRINT(_L("Entering CGdpBTSender::Reset"));
	// Start the state machine off in the 'connect' state.
	// N.B. Was Discover State for GDP-IR but there's not one in BT implementation
	// and as we need a fully operational SDP to do what IrDA did with the 'query' 
	// state we've skipped that one too
	SetNextState(&iConnectState);
DEBUG_PRINT(_L("Leaving CGdpBTSender::Reset"));
	}

/**************** GdpBTSender State transitions ****************/

CGdpBTSender::TSenderState::TSenderState(CGdpBTSender& aSender)
// Just set the sender to be whatever was passed in
: iSender(aSender)
	{
	}

CGdpStateMachine::TState* CGdpBTSender::TSenderState::ErrorL(TInt aCode)
//
// Sender default -- leave, giving the error code.
//
	{
	User::Leave(aCode);
	return NULL; // Never actually hit
	}

//--------------- Sender Connect State ---------------//

CGdpBTSender::TConnectState::TConnectState(CGdpBTSender& aSender)
: TSenderState(aSender)
	{
	}

void CGdpBTSender::TConnectState::EnterL()
	{
DEBUG_PRINT(_L("Entering CGdpBTSender::TConnectState::EnterL"));

	// What are we going to attempt to connect to?
	TProtocolDesc& desc = iSender.iResMan.ProtocolDesc();

	// Close the socket, just in case it's already open
	iSender.iWriteSocket.Close();
	
	// Now open the socket according to what the Resource Manager told us
	User::LeaveIfError(
		iSender.iWriteSocket.Open (iSender.iResMan.SocketServer(), 
							  desc.iAddrFamily, 
							  desc.iSockType, 
							  desc.iProtocol)
					   );

	// Use this hard-coded port num for GDP
	// GDP will be port 11, 1 = SDP, 3 = RFCOMM, etc
	iSender.iAddr.SetPort(0x000b);	
	
	// Send the connect request out of the socket!
	iSender.iWriteSocket.Connect(iSender.iAddr, iSender.iStatus);
	// and wait until we're connected...
	iSender.SetActive();
DEBUG_PRINT(_L("Leaving CGdpBTSender::TConnectState::EnterL"));
	}

CGdpStateMachine::TState* CGdpBTSender::TConnectState::CompleteL()
	{
	// The connect worked, so now we want to write same data 
	//  - go into the write state
	return &(iSender.iWriteState);
	}

void CGdpBTSender::TConnectState::Cancel()
	{
	// Cancel any connect requests for the socket
	iSender.iWriteSocket.CancelConnect();
	}

//--------------- Sender Write State ---------------//

CGdpBTSender::TWriteState::TWriteState(CGdpBTSender& aSender)
: TSenderState(aSender)
	{
	}

void CGdpBTSender::TWriteState::EnterL()
	{
	// Initiate a write...
	iSender.iWriteSocket.Write(iSender.iPacket, iSender.iStatus);
	// and wait...
	iSender.SetActive();
	}