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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_base_2_i_p_c_2_client_server_2_gettingstarted_2transient_2src_2client_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Base/IPC/ClientServer/Gettingstarted/transient/src/client.cpp Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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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>
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<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
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<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00004"></a>00004 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00006"></a>00006 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00007"></a>00007 <span class="comment">//</span>
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<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
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<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00010"></a>00010 <span class="comment">//</span>
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<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Description:</span>
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<a name="l00014"></a>00014 <span class="comment">// Transient server example - client interface implementation</span>
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<a name="l00015"></a>00015 <span class="comment">//</span>
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<a name="l00016"></a>00016
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<a name="l00017"></a>00017 <span class="preprocessor">#include &lt;t-client.h&gt;</span>
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<a name="l00018"></a>00018 <span class="preprocessor">#include &quot;clientserver.h&quot;</span>
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<a name="l00019"></a>00019
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<a name="l00020"></a>00020 <span class="keyword">static</span> TInt StartServer()
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<a name="l00021"></a>00021 <span class="comment">//</span>
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<a name="l00022"></a>00022 <span class="comment">// Start the server process. Simultaneous launching</span>
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<a name="l00023"></a>00023 <span class="comment">// of two such processes should be detected when the second one attempts to</span>
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<a name="l00024"></a>00024 <span class="comment">// create the server object, failing with KErrAlreadyExists.</span>
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<a name="l00025"></a>00025 <span class="comment">//</span>
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<a name="l00026"></a>00026         {
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<a name="l00027"></a>00027         <span class="keyword">const</span> TUidType serverUid(KNullUid,KNullUid,KServerUid3);
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<a name="l00028"></a>00028         RProcess server;
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<a name="l00029"></a>00029         TInt r=server.Create(KMyServerImg,KNullDesC,serverUid);
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<a name="l00030"></a>00030         <span class="keywordflow">if</span> (r!=KErrNone)
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<a name="l00031"></a>00031                 <span class="keywordflow">return</span> r;
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<a name="l00032"></a>00032         TRequestStatus stat;
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<a name="l00033"></a>00033         server.Rendezvous(stat);
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<a name="l00034"></a>00034         <span class="keywordflow">if</span> (stat!=KRequestPending)
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<a name="l00035"></a>00035                 server.Kill(0);         <span class="comment">// abort startup</span>
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<a name="l00036"></a>00036         <span class="keywordflow">else</span>
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<a name="l00037"></a>00037                 server.Resume();        <span class="comment">// logon OK - start the server</span>
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<a name="l00038"></a>00038         User::WaitForRequest(stat);             <span class="comment">// wait for start or death</span>
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<a name="l00039"></a>00039         <span class="comment">// we can&#39;t use the &#39;exit reason&#39; if the server panicked as this</span>
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<a name="l00040"></a>00040         <span class="comment">// is the panic &#39;reason&#39; and may be &#39;0&#39; which cannot be distinguished</span>
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<a name="l00041"></a>00041         <span class="comment">// from KErrNone</span>
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<a name="l00042"></a>00042         r=(server.ExitType()==EExitPanic) ? KErrGeneral : stat.Int();
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<a name="l00043"></a>00043         server.Close();
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<a name="l00044"></a>00044         <span class="keywordflow">return</span> r;
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<a name="l00045"></a>00045         }
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<a name="l00046"></a>00046
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<a name="l00047"></a>00047 EXPORT_C TInt RMySession::Connect()
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<a name="l00048"></a>00048 <span class="comment">//</span>
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<a name="l00049"></a>00049 <span class="comment">// Connect to the server, attempting to start it if necessary</span>
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<a name="l00050"></a>00050 <span class="comment">//</span>
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<a name="l00051"></a>00051         {
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<a name="l00052"></a>00052         TInt retry=2;
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<a name="l00053"></a>00053         <span class="keywordflow">for</span> (;;)
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<a name="l00054"></a>00054                 {
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<a name="l00055"></a>00055                 TInt r=CreateSession(KMyServerName,TVersion(0,0,0),1);
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<a name="l00056"></a>00056                 <span class="keywordflow">if</span> (r!=KErrNotFound &amp;&amp; r!=KErrServerTerminated)
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<a name="l00057"></a>00057                         <span class="keywordflow">return</span> r;
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<a name="l00058"></a>00058                 <span class="keywordflow">if</span> (--retry==0)
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<a name="l00059"></a>00059                         <span class="keywordflow">return</span> r;
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<a name="l00060"></a>00060                 r=StartServer();
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<a name="l00061"></a>00061                 <span class="keywordflow">if</span> (r!=KErrNone &amp;&amp; r!=KErrAlreadyExists)
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<a name="l00062"></a>00062                         <span class="keywordflow">return</span> r;
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<a name="l00063"></a>00063                 }
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<a name="l00064"></a>00064         }
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<a name="l00065"></a>00065
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<a name="l00066"></a>00066 EXPORT_C TInt RMySession::Send(<span class="keyword">const</span> TDesC&amp; aMessage)
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<a name="l00067"></a>00067         {
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<a name="l00068"></a>00068         <span class="keywordflow">if</span> (aMessage.Length()&gt;KMaxMyMessage)
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<a name="l00069"></a>00069                 <span class="keywordflow">return</span> KErrArgument;
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<a name="l00070"></a>00070         <span class="keywordflow">return</span> SendReceive(ESend,TIpcArgs(&amp;aMessage));
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<a name="l00071"></a>00071         }
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<a name="l00072"></a>00072
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<a name="l00073"></a>00073 EXPORT_C <span class="keywordtype">void</span> RMySession::Receive(TRequestStatus&amp; aStatus,TDes&amp; aMessage)
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<a name="l00074"></a>00074         {
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<a name="l00075"></a>00075         SendReceive(EReceive,TIpcArgs(&amp;aMessage,aMessage.MaxLength()),aStatus);
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<a name="l00076"></a>00076         }
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<a name="l00077"></a>00077
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<a name="l00078"></a>00078 EXPORT_C <span class="keywordtype">void</span> RMySession::CancelReceive()
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<a name="l00079"></a>00079         {
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<a name="l00080"></a>00080         SendReceive(ECancelReceive);
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<a name="l00081"></a>00081         }
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
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