Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_base_2_i_p_c_2_client_server_2_gettingstarted_2transient_2src_2client_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/Base/IPC/ClientServer/Gettingstarted/transient/src/client.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">// Transient server example - client interface implementation</span>
<a name="l00015"></a>00015 <span class="comment">//</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#include <t-client.h></span>
<a name="l00018"></a>00018 <span class="preprocessor">#include "clientserver.h"</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="keyword">static</span> TInt StartServer()
<a name="l00021"></a>00021 <span class="comment">//</span>
<a name="l00022"></a>00022 <span class="comment">// Start the server process. Simultaneous launching</span>
<a name="l00023"></a>00023 <span class="comment">// of two such processes should be detected when the second one attempts to</span>
<a name="l00024"></a>00024 <span class="comment">// create the server object, failing with KErrAlreadyExists.</span>
<a name="l00025"></a>00025 <span class="comment">//</span>
<a name="l00026"></a>00026 {
<a name="l00027"></a>00027 <span class="keyword">const</span> TUidType serverUid(KNullUid,KNullUid,KServerUid3);
<a name="l00028"></a>00028 RProcess server;
<a name="l00029"></a>00029 TInt r=server.Create(KMyServerImg,KNullDesC,serverUid);
<a name="l00030"></a>00030 <span class="keywordflow">if</span> (r!=KErrNone)
<a name="l00031"></a>00031 <span class="keywordflow">return</span> r;
<a name="l00032"></a>00032 TRequestStatus stat;
<a name="l00033"></a>00033 server.Rendezvous(stat);
<a name="l00034"></a>00034 <span class="keywordflow">if</span> (stat!=KRequestPending)
<a name="l00035"></a>00035 server.Kill(0); <span class="comment">// abort startup</span>
<a name="l00036"></a>00036 <span class="keywordflow">else</span>
<a name="l00037"></a>00037 server.Resume(); <span class="comment">// logon OK - start the server</span>
<a name="l00038"></a>00038 User::WaitForRequest(stat); <span class="comment">// wait for start or death</span>
<a name="l00039"></a>00039 <span class="comment">// we can't use the 'exit reason' if the server panicked as this</span>
<a name="l00040"></a>00040 <span class="comment">// is the panic 'reason' and may be '0' which cannot be distinguished</span>
<a name="l00041"></a>00041 <span class="comment">// from KErrNone</span>
<a name="l00042"></a>00042 r=(server.ExitType()==EExitPanic) ? KErrGeneral : stat.Int();
<a name="l00043"></a>00043 server.Close();
<a name="l00044"></a>00044 <span class="keywordflow">return</span> r;
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046
<a name="l00047"></a>00047 EXPORT_C TInt RMySession::Connect()
<a name="l00048"></a>00048 <span class="comment">//</span>
<a name="l00049"></a>00049 <span class="comment">// Connect to the server, attempting to start it if necessary</span>
<a name="l00050"></a>00050 <span class="comment">//</span>
<a name="l00051"></a>00051 {
<a name="l00052"></a>00052 TInt retry=2;
<a name="l00053"></a>00053 <span class="keywordflow">for</span> (;;)
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 TInt r=CreateSession(KMyServerName,TVersion(0,0,0),1);
<a name="l00056"></a>00056 <span class="keywordflow">if</span> (r!=KErrNotFound && r!=KErrServerTerminated)
<a name="l00057"></a>00057 <span class="keywordflow">return</span> r;
<a name="l00058"></a>00058 <span class="keywordflow">if</span> (--retry==0)
<a name="l00059"></a>00059 <span class="keywordflow">return</span> r;
<a name="l00060"></a>00060 r=StartServer();
<a name="l00061"></a>00061 <span class="keywordflow">if</span> (r!=KErrNone && r!=KErrAlreadyExists)
<a name="l00062"></a>00062 <span class="keywordflow">return</span> r;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065
<a name="l00066"></a>00066 EXPORT_C TInt RMySession::Send(<span class="keyword">const</span> TDesC& aMessage)
<a name="l00067"></a>00067 {
<a name="l00068"></a>00068 <span class="keywordflow">if</span> (aMessage.Length()>KMaxMyMessage)
<a name="l00069"></a>00069 <span class="keywordflow">return</span> KErrArgument;
<a name="l00070"></a>00070 <span class="keywordflow">return</span> SendReceive(ESend,TIpcArgs(&aMessage));
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072
<a name="l00073"></a>00073 EXPORT_C <span class="keywordtype">void</span> RMySession::Receive(TRequestStatus& aStatus,TDes& aMessage)
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075 SendReceive(EReceive,TIpcArgs(&aMessage,aMessage.MaxLength()),aStatus);
<a name="l00076"></a>00076 }
<a name="l00077"></a>00077
<a name="l00078"></a>00078 EXPORT_C <span class="keywordtype">void</span> RMySession::CancelReceive()
<a name="l00079"></a>00079 {
<a name="l00080"></a>00080 SendReceive(ECancelReceive);
<a name="l00081"></a>00081 }
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