TB10.1 Example Applications: examples/Base/IPC/ClientServer/Gettingstarted/transient/src/client.cpp Source File

00001 // Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).
-00002 // All rights reserved.
-00003 // This component and the accompanying materials are made available
-00004 // under the terms of "Eclipse Public License v1.0"
-00005 // which accompanies this distribution, and is available
-00006 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
-00007 //
-00008 // Initial Contributors:
-00009 // Nokia Corporation - initial contribution.
-00010 //
-00011 // Contributors:
-00012 //
-00013 // Description:
-00014 // Transient server example - client interface implementation
-00015 //
-00016 
-00017 #include <t-client.h>
-00018 #include "clientserver.h"
-00019 
-00020 static TInt StartServer()
-00021 //
-00022 // Start the server process. Simultaneous launching
-00023 // of two such processes should be detected when the second one attempts to
-00024 // create the server object, failing with KErrAlreadyExists.
-00025 //
-00026         {
-00027         const TUidType serverUid(KNullUid,KNullUid,KServerUid3);
-00028         RProcess server;
-00029         TInt r=server.Create(KMyServerImg,KNullDesC,serverUid);
-00030         if (r!=KErrNone)
-00031                 return r;
-00032         TRequestStatus stat;
-00033         server.Rendezvous(stat);
-00034         if (stat!=KRequestPending)
-00035                 server.Kill(0);         // abort startup
-00036         else
-00037                 server.Resume();        // logon OK - start the server
-00038         User::WaitForRequest(stat);             // wait for start or death
-00039         // we can't use the 'exit reason' if the server panicked as this
-00040         // is the panic 'reason' and may be '0' which cannot be distinguished
-00041         // from KErrNone
-00042         r=(server.ExitType()==EExitPanic) ? KErrGeneral : stat.Int();
-00043         server.Close();
-00044         return r;
-00045         }
-00046 
-00047 EXPORT_C TInt RMySession::Connect()
-00048 //
-00049 // Connect to the server, attempting to start it if necessary
-00050 //
-00051         {
-00052         TInt retry=2;
-00053         for (;;)
-00054                 {
-00055                 TInt r=CreateSession(KMyServerName,TVersion(0,0,0),1);
-00056                 if (r!=KErrNotFound && r!=KErrServerTerminated)
-00057                         return r;
-00058                 if (--retry==0)
-00059                         return r;
-00060                 r=StartServer();
-00061                 if (r!=KErrNone && r!=KErrAlreadyExists)
-00062                         return r;
-00063                 }
-00064         }
-00065 
-00066 EXPORT_C TInt RMySession::Send(const TDesC& aMessage)
-00067         {
-00068         if (aMessage.Length()>KMaxMyMessage)
-00069                 return KErrArgument;
-00070         return SendReceive(ESend,TIpcArgs(&aMessage));
-00071         }
-00072 
-00073 EXPORT_C void RMySession::Receive(TRequestStatus& aStatus,TDes& aMessage)
-00074         {
-00075         SendReceive(EReceive,TIpcArgs(&aMessage,aMessage.MaxLength()),aStatus);
-00076         }
-00077 
-00078 EXPORT_C void RMySession::CancelReceive()
-00079         {
-00080         SendReceive(ECancelReceive);
-00081         }
-