gsdpclient.cpp

Symbian mobile os C++ GSDP编程

// gsdpclient.cpp
//
// Copyright (c) 2002 Symbian Ltd.  All rights reserved.

#include "gsdpclient.h"
#include "gsdpserver.h"

void Panic(TInt aPanic)
	{
	_LIT(KPanicCategory,"GSDP Client");
	User::Panic(KPanicCategory, aPanic);
	}

/*
	class RGsdpSession
*/

// open/close

EXPORT_C void RGsdpSession::ConnectL(MGsdpPacketHandler& aHandler)
	{
	// connect to server
	TInt err=KErrNone;
	for (TInt tries=0; tries<2; tries++)
		{
		err=CreateSession(KGsdpServerName, TVersion(0,0,0));
		if (!err) break; // connected to existing server - ok
		if (err!=KErrNotFound && err!=KErrServerTerminated)
			break; // problems other than server not here - propagate error
		err=CGsdpScheduler::LaunchFromClient();
		if (!err) continue; // if server launched ok, try again to connect
		if (err==KErrAlreadyExists)
			continue; // if someone else got there first, try again to connect
		break; // server not launched: don't cycle round again
		}
	User::LeaveIfError(err);
	// create active object receive handler and add it to scheduler
	CleanupClosePushL(*this);  // Close if next operation leaves
	iHandler=new (ELeave) CGsdpReceiveHandler(aHandler, *this);
	CleanupStack::Pop(this);
	CActiveScheduler::Add(iHandler);
	}

EXPORT_C void RGsdpSession::Close()
	{
	// destroy receiver-handler
	delete iHandler;
	iHandler=0;
	// destroy server session
	RSessionBase::Close();
	}

// game protocol

EXPORT_C void RGsdpSession::SetGameProtocol(TUint32 aProtocol)
	{
	TInt p[KMaxMessageArguments];
	p[0]=(TInt) aProtocol;
	SendReceive(EGsdpReqSetGameProtocol, p);
	}

EXPORT_C TUint32 RGsdpSession::GetGameProtocol() const
	{
	return SendReceive(EGsdpReqGetGameProtocol, 0);
	}

// set and get GDP protocol

EXPORT_C TInt RGsdpSession::SetGdpProtocol(TUid aProtocol)
	{
	TInt p[KMaxMessageArguments];
	p[0]= aProtocol.iUid;
	return SendReceive(EGsdpReqSetGdpProtocol, p);
	}

EXPORT_C TUid RGsdpSession::GetGdpProtocol() const
	{
	return TUid::Uid(SendReceive(EGsdpReqGetGdpProtocol, 0));
	}

EXPORT_C TBool RGsdpSession::GdpIsNetworked() const
	{
	return SendReceive(EGsdpReqGdpIsNetworked, 0);
	}

EXPORT_C TInt RGsdpSession::CountGdpProtocols() const
	{
	return SendReceive(EGsdpReqCountProtocols, 0);
	}

EXPORT_C TInt RGsdpSession::GetGdpProtocolInfo(TInt aProto, TGdpProtocolInfo& aInfo) const
	{
	TPckg<TGdpProtocolInfo> buf(aInfo);
	TInt p[KMaxMessageArguments];
	p[0] = aProto;
	p[1] = reinterpret_cast<TInt>(&buf);
	return SendReceive(EGsdpReqProtocolInfo, p);
	}

// set and get my port

EXPORT_C void RGsdpSession::SetMyPort(TUint32 aPort)
	{
	TInt p[KMaxMessageArguments];
	p[0]=(TInt) aPort;
	SendReceive(EGsdpReqSetMyPort, p);
	}

EXPORT_C TUint32 RGsdpSession::GetMyPort() const
	{
	return SendReceive(EGsdpReqGetMyPort, 0);
	}

EXPORT_C TUint32 RGsdpSession::AllocMyNextPort()
	{
	return SendReceive(EGsdpReqAllocMyNextPort, 0);
	}

// set and get other address and port

EXPORT_C void RGsdpSession::SetOtherAddress(const TDesC8& aAddress)
	{
	TInt p[KMaxMessageArguments];
	p[0]=(TInt) &aAddress;
	SendReceive(EGsdpReqSetOtherAddress, p);
	}

EXPORT_C void RGsdpSession::GetOtherAddress(TDes8& aAddress) const
	{
	TInt p[KMaxMessageArguments];
	p[0]=(TInt) &aAddress;
	SendReceive(EGsdpReqGetOtherAddress, p);
	}

EXPORT_C void RGsdpSession::SetOtherPort(TUint32 aPort)
	{
	TInt p[KMaxMessageArguments];
	p[0]=(TInt) aPort;
	SendReceive(EGsdpReqSetOtherPort, p);
	}

EXPORT_C TUint32 RGsdpSession::GetOtherPort() const
	{
	return SendReceive(EGsdpReqGetOtherPort, 0);
	}

// main protocol functions

EXPORT_C void RGsdpSession::Listen()
	{
	// kick off receive handler active object to start listening and start a receive
	if (!iHandler->IsActive())
		{
		iHandler->Receive();
		}
	}

EXPORT_C void RGsdpSession::StopListening()
	{
	// tell receive handler to cancel receive and stop listening
	iHandler->Cancel();
	}

EXPORT_C void RGsdpSession::Send(const TDesC8& aData)
	{
	TInt p[KMaxMessageArguments];
	p[0]=(TInt) &aData;
	SendReceive(EGsdpReqSend, p);
	}

// initiate receive-all for "pull" protocols

EXPORT_C void RGsdpSession::ReceiveAll() const
	{
	SendReceive(EGsdpReqReceiveAll, 0);
	}

// private functions in conjunction with CGsdpReceiveHandler

void RGsdpSession::Receive(TDes8& aBuffer, TRequestStatus& aStatus)
	{
	TInt p[KMaxMessageArguments];
	p[0]=(TInt) &aBuffer;
	SendReceive(EGsdpReqReceive, p, aStatus);
	}

void RGsdpSession::CancelReceive()
	{
	SendReceive(EGsdpReqCancelReceive, 0);
	}

/*
	CGsdpReceiveHandler
*/

// construct/destruct

CGsdpReceiveHandler::CGsdpReceiveHandler(MGsdpPacketHandler& aHandler, RGsdpSession& aSession)
	: CActive(0), iSession(aSession), iHandler(aHandler)
	{
	}

CGsdpReceiveHandler::~CGsdpReceiveHandler()
	{
	Cancel();
	}

// operation

void CGsdpReceiveHandler::Receive()
	{
	iSession.Receive(iBuffer, iStatus);
	SetActive();
	}

// from CActive

void CGsdpReceiveHandler::RunL()
	{
	iHandler.GsdpHandleL(iBuffer);
	// initiate next receive
	Receive();
	}

void CGsdpReceiveHandler::DoCancel()
	{
	iSession.CancelReceive();
	}

/*
	DLL harness
*/

EXPORT_C TInt E32Dll(TDllReason)
	{
	return 0;
	}