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you may risk choosing a number that you do not think will clash with anybody else s process. I don t recommend it, but I do recognize that it happens. The Symbian OS Connectivity framework for v8.0 and later smartphones solves this problem by using one xed port for the Service Broker (and this xed port number has been allocated by the IANA) and de ning a message protocol that allows other servers to pass dynamically allocated port numbers back to the PC. Problems 2 and 3 are addressed below.
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A socket server works by listening on a port number. The following code is extracted from several different methods of a test socket server that was created to test this chapter.
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class CTestSocketServer : public CActive { public: static CTestSocketServer* NewL(TUint16 aPortNumber, TUint16 aMaxConnections); CTestSocketServer(); void ConstructL(TUint16 aPortNumber, TUint16 aMaxConnections); CTestSocketServer(); void StartL(); public: //from CActive void RunL(); void DoCancel(); TInt RunError(TInt aErr); private: RSocketServ iServer; // Session to the EPOC socket server (ESOCK) RSocket iSocket; // The server socket RSocket iClientSocket; TUint16 iPortNumber; // Port number to listen on TUint16 iMaxConnectionQueue; // Max connections CRx* iRx; CTx* iTx; }; void DoMainL() { CActiveScheduler* p = new (ELeave) CActiveScheduler; CleanupStack::PushL(p); CActiveScheduler::Install(p); CTestSocketServer* server = CTestSocketServer::NewL(3050, 1); CleanupStack::PushL(server); server->StartL(); p->Start(); CleanupStack::PopAndDestroy(server); CleanupStack::PopAndDestroy(p);
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} CTestSocketServer* CTestSocketServer::NewL(TUint16 aPortNumber, TUint16 aMaxConnections) { CTestSocketServer* self = new (ELeave) CTestSocketServer(); CleanupStack::PushL(self); self->ConstructL(aPortNumber, aMaxConnections); CleanupStack::Pop(self); return self; } CTestSocketServer::CTestSocketServer(): CActive(CActive::EPriorityStandard) { } void CTestSocketServer::ConstructL(TUint16 aPortNumber, TUint16 aMaxConnections) { iPortNumber = aPortNumber; iMaxConnectionQueue = aMaxConnections; CActiveScheduler::Add(this); } CTestSocketServer:: CTestSocketServer() { delete iRx; delete iTx; iSocket.Close(); iServer.Close(); } void CTestSocketServer::StartL() { if (!IsActive()) { User::LeaveIfError(iServer.Connect()); User::LeaveIfError(iSocket.Open(iServer, KAfInet, KSockStream, KProtocolInetTcp)); TInetAddr address(KInetAddrAny,iPortNumber); User::LeaveIfError(iSocket.Bind(address)); User::LeaveIfError(iSocket.Listen(iMaxConnectionQueue)); User::LeaveIfError(iClientSocket.Open(iServer)); iSocket.Accept(iClientSocket, iStatus); SetActive(); } }
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I will not go into too much detail on the APIs that have been used they are the standard Symbian OS socket APIs and more details can be found in the SDKs. The result of the above code is to listen on socket 3050. If and when a client attempts to connect on this port number, the CTestSocketServer::RunL() method will be called and the socket server will use additional Active Objects to start communications. Commonly, it
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will create an Active Object to call RSocket::RecvOneOrMore() to wait for commands. Given a socket server on the phone listening on a known port, BAL provides a method of connection. You can connect to a listening port by using the StartGeneralService() method with a service name that is the port number in decimal, pre xed by a # character:
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int serviceError = mPhone.StartGeneralService("#3050", out mAStream);
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If a server is listening on the speci ed port then this will connect to it and return a stream that can be used in the same way as a stream that was used to connect to a named service.
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The nal problem, that of starting the socket server when required, is less easily solved. You could put the socket server in a GUI application on the phone and require the user to start it manually, but that will not be regarded as friendly by the users (it will also get closed down if a backup is triggered which may be a problem for a Connectivity service). You could arrange for your service to be started whenever the Symbian OS smartphone boots up, but this is frowned upon. The available methods involve misusing other APIs; in any case, any running server takes up resources and a smartphone has only a limited amount of resources. What we really want is to start the service from the PC only when we need to use it. This is exactly what the Service Broker provides for registered services from Symbian OS v8.0 onwards, so we need to implement our own service that provides a similar service. We can create a PC Connectivity service (either a custom server or a specialized socket server) with a message protocol that allows us to start another server on the phone. It may sound as though we are having to create a specialized service which we were trying to avoid in the rst place, but, in fact, we are creating a service that can be used to start any number of other servers and that allows us to keep our servers separate from any other PC Connectivity issues. I will not include the custom server code, but the key method is as follows:
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void CStartCSSession::StartServiceL( TInt aMsgId) { TInt nameLength = CConnPack::PeekInt32L(iReadPtr); HBufC* nameBuff = HBufC::NewLC(nameLength); TPtr namePtr(nameBuff->Des()); CConnPack::ReadUNCDataL(namePtr, iReadPtr);
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