DEVELOPING AN SMS MANAGEMENT CONNECTIVITY SERVICE in VS .NET

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DEVELOPING AN SMS MANAGEMENT CONNECTIVITY SERVICE
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TInt msgCount = eventEntrySelection->Count(); TBool gotData = EFalse; // goes true if we have an SMS message for (TInt jj = 0; jj < msgCount; jj++) { TMsvId id = eventEntrySelection->At(jj); // For deletion - don t check type, for others do if(aEvent == MMsvSessionObserver::EMsvEntriesDeleted) { CConnPack::WriteInt32L(id, aBuffer); gotData = ETrue; } else { TMsvEntry msgEntry; TMsvId owningServiceId; User::LeaveIfError(iMsvSession->GetEntry(id, owningServiceId, msgEntry)); // Check that it is an SMS message if((msgEntry.iType == KUidMsvMessageEntry) && (msgEntry.iMtm == KUidMsgTypeSMS)) { CConnPack::WriteInt32L(id, aBuffer); gotData = ETrue; } }// endif }// endfor if(gotData) { // Write terminating null ID CConnPack::WriteInt32L(0, aBuffer); // If a moved event then we have extra data in arg2 and arg3 if(aEvent == MMsvSessionObserver::EMsvEntriesMoved) { CConnPack::WriteInt32L(*(TInt32*)arg2, aBuffer); CConnPack::WriteInt32L(*(TInt32*)arg3, aBuffer); } } else { // No real data (messages were not SMS messages) so reset back // the offset TInt newLength = aBuffer.Length()-startLength; aBuffer.Delete(startLength-1,newLength); }
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One point to note is that we might be tempted to get all the message data in this routine, but this would be a mistake. As a rule, we should not do too much work in any event handler, so I do not want to do anything more than unpack the event details. Also, experience shows that we may get several events for the same message in quick succession. If we get message data for each event then we will be sending the same data repeatedly. Instead, we just send the raw event details, and the PC
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PUTTING THE MESSAGING CODE IN A CONNECTIVITY PLUG-IN
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client will be responsible for ltering out repeated events and retrieving the data only once.
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10.7 Putting the Messaging Code in a Connectivity Plug-in
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The previous sections have shown the messaging code. We also need the code in the custom server or socket server to invoke these methods. Most of the commands are straightforward. We need to identify the incoming command, call a messaging method and return a response. For a socket server the factory does this, but for a custom server we build our own code this is a standard pattern.
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void CRSmsCSSession::ReadCompleteL(TDes8* /*aPdu*/) { TRSmsCmdCode aCmd = (TRSmsCmdCode)CConnPack::ReadInt32L(iReadPtr); TInt msgId = CConnPack::ReadInt32L(iReadPtr); TRAPD(retVal, DoServiceL(aCmd, msgId)); if(retVal != KErrNone) { WriteErrorL(retVal, msgId); } } void CRSmsCSSession::DoServiceL(TRSmsCmdCode aCmd, TInt aMsgId) { switch(aCmd) { case ERSmsCmdQueryVersion: QueryVersionL(aMsgId); break; case ERSmsCmdGetAllSms: GetAllSmsL(aMsgId); break; case ERSmsCmdGetMoreSms : GetMoreSmsL(aMsgId); break; case ERSmsCmdGetSmsById: GetSmsByIdL(aMsgId); break; case ERSmsCmdDeleteSms: DeleteSmsL(aMsgId); break; case ERSmsCmdSendSms: SendSmsL(aMsgId); break; default: break; //Do Nothing } return; }
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We call the service routine via a TRAP so we can catch errors and return an error PDU to the PC client.
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DEVELOPING AN SMS MANAGEMENT CONNECTIVITY SERVICE
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Then the individual service routines here call one of the messaging routines and return the response. They are all quite similar, so I will just show one here.
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void CRSmsCSSession::GetSmsByIdL(TInt aMsgId) { TInt msgId = CConnPack::ReadInt32L(iReadPtr); // Start a PDU with a response iWritePtr.Zero(); CConnPack::WriteInt32L(ERSmsCmdReceiveInitialSms, iWritePtr); CConnPack::WriteInt32L(aMsgId, iWritePtr); iMsgUtil->GetSmsByIdL(msgId, iWritePtr); Write(&iWritePtr); }
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The one aspect missing from this PC Connectivity plug-in is the handling of Message Server events. The connection (for the custom server and the socket server) cannot be used for reading and writing simultaneously. Therefore, we will need a second connection just for the events. In fact, we could avoid this by caching event details and requesting them on a regular basis, but that would impose a delay on receiving incoming messages. Therefore, we have de ned the command to put a connection into event reporting mode. We are supposed to have only one Message Server session per thread, and both the connections will share the same thread (certainly in the case of a custom server). Therefore, we have made the CMsvSession owned by the top-level server. When an event handling command comes in, the server is informed that this session is to be used for event reporting. Subsequently, when an event occurs, it is redirected to the relevant session.
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void CRSmsCSServer::SetEventSession(CRSmsCSSession* aEventSession) { iEventSession = aEventSession; } ... void CRSmsCSSession::DoServiceL(TRSmsCmdCode aCmd, TInt aMsgId) { switch(aCmd) { case ERSmsCmdQueryVersion: QueryVersionL(aMsgId); break; case ERSmsCmdGetAllSms: GetAllSmsL(aMsgId); break; case ERSmsCmdGetMoreSms :
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