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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_m_classes3_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/Basics/MClasses3/MClasses3.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/Basics/MClasses3/MClasses3.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 1997-2009 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">// Demonstrate use of M classes, or mixins - the</span>
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<a name="l00015"></a>00015 <span class="comment">// only use of multiple inheritance that has been</span>
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<a name="l00016"></a>00016 <span class="comment">// sanctioned by the E32 architecture team</span>
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<a name="l00017"></a>00017 <span class="comment">// This example shows how mixins can be used to</span>
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<a name="l00018"></a>00018 <span class="comment">// pass some protocol, and an associated object, from</span>
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<a name="l00019"></a>00019 <span class="comment">// a protocol provider to an protocol user.  The user</span>
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<a name="l00020"></a>00020 <span class="comment">// is not supposed to know everything about the provider,</span>
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<a name="l00021"></a>00021 <span class="comment">// only about the protocol it&#39;s interested in.</span>
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<a name="l00022"></a>00022 <span class="comment">// In this specific example, the provider is derived from</span>
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<a name="l00023"></a>00023 <span class="comment">// an appropriate base class, and a mixin class representing</span>
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<a name="l00024"></a>00024 <span class="comment">// the protocol. The benefits of the method shown in example EUTYPEM2</span>
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<a name="l00025"></a>00025 <span class="comment">// are  thus gained, without the inconvenience of intermediary</span>
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<a name="l00026"></a>00026 <span class="comment">// classes.</span>
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<a name="l00027"></a>00027 <span class="comment">//</span>
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<a name="l00028"></a>00028
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<a name="l00029"></a>00029
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<a name="l00030"></a>00030
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<a name="l00031"></a>00031 <span class="preprocessor">#include &quot;CommonFramework.h&quot;</span>
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<a name="l00032"></a>00032
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<a name="l00034"></a>00034 <span class="comment">//</span>
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<a name="l00035"></a>00035 <span class="comment">// -----&gt; CProtocol (definition)</span>
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<a name="l00036"></a>00036 <span class="comment">//</span>
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<a name="l00037"></a>00037 <span class="comment">// A protocol class for mixing in</span>
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<a name="l00038"></a>00038 <span class="comment">//</span>
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<a name="l00040"></a>00040 <span class="comment"></span><span class="keyword">class </span>MProtocol
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<a name="l00041"></a>00041         {
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<a name="l00042"></a>00042 <span class="keyword">public</span>:
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<a name="l00043"></a>00043         <span class="keyword">virtual</span> <span class="keywordtype">void</span> HandleEvent(TInt aEventCode)=0;
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<a name="l00044"></a>00044         };
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<a name="l00045"></a>00045
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<a name="l00046"></a>00046
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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">// -----&gt; CProtocolUser (definition)</span>
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<a name="l00050"></a>00050 <span class="comment">//</span>
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<a name="l00051"></a>00051 <span class="comment">// Define a protocol user which uses this protocol</span>
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<a name="l00052"></a>00052 <span class="comment">//</span>
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<a name="l00054"></a>00054 <span class="comment"></span><span class="keyword">class </span>CProtocolUser : <span class="keyword">public</span> CBase
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<a name="l00055"></a>00055         {
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<a name="l00056"></a>00056 <span class="keyword">public</span>:
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<a name="l00057"></a>00057           <span class="comment">// Construction</span>
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<a name="l00058"></a>00058         <span class="keyword">static</span> CProtocolUser* NewLC();
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<a name="l00059"></a>00059         <span class="keyword">static</span> CProtocolUser* NewL();
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<a name="l00060"></a>00060
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<a name="l00061"></a>00061           <span class="comment">// Destruction</span>
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<a name="l00062"></a>00062         ~CProtocolUser();
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<a name="l00063"></a>00063
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<a name="l00064"></a>00064           <span class="comment">// Some function which uses a protocol</span>
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<a name="l00065"></a>00065         <span class="keywordtype">void</span> DoSomething(MProtocol* aProtocol);
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<a name="l00066"></a>00066
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<a name="l00067"></a>00067 <span class="keyword">protected</span>:
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<a name="l00068"></a>00068           <span class="comment">// Construction assistance</span>
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<a name="l00069"></a>00069         <span class="keywordtype">void</span> ConstructL();
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<a name="l00070"></a>00070         };
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<a name="l00071"></a>00071
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<a name="l00072"></a>00072
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<a name="l00074"></a>00074 <span class="comment">//</span>
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<a name="l00075"></a>00075 <span class="comment">// -----&gt; CProtocolProvider (definition)</span>
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<a name="l00076"></a>00076 <span class="comment">//</span>
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<a name="l00077"></a>00077 <span class="comment">// A simple class which uses the mixin</span>
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<a name="l00078"></a>00078 <span class="comment">//</span>
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<a name="l00080"></a>00080 <span class="comment"></span><span class="keyword">class </span>CProtocolProvider : <span class="keyword">public</span> CBase, <span class="keyword">public</span> MProtocol
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<a name="l00081"></a>00081         {
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<a name="l00082"></a>00082 <span class="keyword">public</span>:
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<a name="l00083"></a>00083           <span class="comment">// Construction</span>
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<a name="l00084"></a>00084         <span class="keyword">static</span> CProtocolProvider* NewLC();
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<a name="l00085"></a>00085
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<a name="l00086"></a>00086           <span class="comment">// Destruction</span>
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<a name="l00087"></a>00087         ~CProtocolProvider();
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<a name="l00088"></a>00088
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<a name="l00089"></a>00089           <span class="comment">// Calls the protocol user</span>
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<a name="l00090"></a>00090         <span class="keywordtype">void</span> CallProtocolUser();
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<a name="l00091"></a>00091
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<a name="l00092"></a>00092           <span class="comment">// Implement the protocol (handles the protocol)</span>
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<a name="l00093"></a>00093         <span class="keywordtype">void</span> HandleEvent(TInt aEventCode);
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<a name="l00094"></a>00094
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<a name="l00095"></a>00095 <span class="keyword">protected</span>:
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<a name="l00096"></a>00096           <span class="comment">// Construction assistance</span>
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<a name="l00097"></a>00097         <span class="keywordtype">void</span> ConstructL();
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<a name="l00098"></a>00098
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<a name="l00099"></a>00099 <span class="keyword">private</span>:
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<a name="l00100"></a>00100           <span class="comment">// data members defined by this class</span>
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<a name="l00101"></a>00101         CProtocolUser*     iProtocolUser;
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<a name="l00102"></a>00102         };
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<a name="l00103"></a>00103
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<a name="l00104"></a>00104
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<a name="l00106"></a>00106 <span class="comment">//</span>
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<a name="l00107"></a>00107 <span class="comment">// -----&gt; CProtocolUser (implementation)</span>
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<a name="l00108"></a>00108 <span class="comment">//</span>
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<a name="l00110"></a>00110 <span class="comment"></span>CProtocolUser* CProtocolUser::NewLC()
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   113
 
<a name="l00111"></a>00111         {
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<a name="l00112"></a>00112         CProtocolUser* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave) CProtocolUser;
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<a name="l00113"></a>00113         CleanupStack::PushL(<span class="keyword">self</span>);
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<a name="l00114"></a>00114         <span class="keyword">self</span>-&gt;ConstructL();
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<a name="l00115"></a>00115         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00116"></a>00116         }
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<a name="l00117"></a>00117
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<a name="l00118"></a>00118 CProtocolUser* CProtocolUser::NewL()
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<a name="l00119"></a>00119         {
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<a name="l00120"></a>00120         CProtocolUser* <span class="keyword">self</span>=NewLC();
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<a name="l00121"></a>00121         CleanupStack::Pop();
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<a name="l00122"></a>00122         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00123"></a>00123         }
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<a name="l00124"></a>00124
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<a name="l00125"></a>00125 CProtocolUser::~CProtocolUser()
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<a name="l00126"></a>00126         {
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<a name="l00127"></a>00127         }
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<a name="l00128"></a>00128
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<a name="l00129"></a>00129 <span class="keywordtype">void</span> CProtocolUser::ConstructL()
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<a name="l00130"></a>00130         {
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<a name="l00131"></a>00131         }
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<a name="l00132"></a>00132
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<a name="l00133"></a>00133 <span class="keywordtype">void</span> CProtocolUser::DoSomething(MProtocol* aProtocol)
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<a name="l00134"></a>00134         {
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<a name="l00135"></a>00135           <span class="comment">// Do something that requires a protocol</span>
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<a name="l00136"></a>00136         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtExtSystemDoing,<span class="stringliteral">&quot;External system doing something\n&quot;</span>);
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<a name="l00137"></a>00137         console-&gt;Printf(KTxtExtSystemDoing);
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<a name="l00138"></a>00138         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtInvokingProtocol,<span class="stringliteral">&quot;invoking protocol - event 3\n&quot;</span>);
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<a name="l00139"></a>00139         console-&gt;Printf(KTxtInvokingProtocol);
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<a name="l00140"></a>00140           <span class="comment">// Handle an event</span>
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<a name="l00141"></a>00141         aProtocol-&gt;HandleEvent(3);
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<a name="l00142"></a>00142         }
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<a name="l00143"></a>00143
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<a name="l00144"></a>00144
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<a name="l00146"></a>00146 <span class="comment">//</span>
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<a name="l00147"></a>00147 <span class="comment">// -----&gt; CProtocolProvider (implementation)</span>
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<a name="l00148"></a>00148 <span class="comment">//</span>
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<a name="l00150"></a>00150 <span class="comment"></span>CProtocolProvider* CProtocolProvider::NewLC()
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   151
 
<a name="l00151"></a>00151         {
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<a name="l00152"></a>00152         CProtocolProvider* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave) CProtocolProvider;
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<a name="l00153"></a>00153         CleanupStack::PushL(<span class="keyword">self</span>);
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<a name="l00154"></a>00154         <span class="keyword">self</span>-&gt;ConstructL();
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<a name="l00155"></a>00155         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00156"></a>00156         };
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<a name="l00157"></a>00157
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<a name="l00158"></a>00158 CProtocolProvider::~CProtocolProvider()
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   159
 
<a name="l00159"></a>00159         {
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<a name="l00160"></a>00160         <span class="keyword">delete</span> iProtocolUser;
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<a name="l00161"></a>00161         }
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<a name="l00162"></a>00162
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<a name="l00163"></a>00163 <span class="keywordtype">void</span> CProtocolProvider::ConstructL()
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<a name="l00164"></a>00164         {
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<a name="l00165"></a>00165         iProtocolUser=CProtocolUser::NewL();
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<a name="l00166"></a>00166         }
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<a name="l00167"></a>00167
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<a name="l00168"></a>00168 <span class="keywordtype">void</span> CProtocolProvider::CallProtocolUser()
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<a name="l00169"></a>00169         {
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<a name="l00170"></a>00170           <span class="comment">// Call the protocol user to do some work</span>
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<a name="l00171"></a>00171         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtCallProtUser,<span class="stringliteral">&quot;CProtocolProvider calling protocol user\n&quot;</span>);
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<a name="l00172"></a>00172         console-&gt;Printf(KTxtCallProtUser);
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<a name="l00173"></a>00173         iProtocolUser-&gt;DoSomething(<span class="keyword">this</span>);
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   174
 
<a name="l00174"></a>00174          <span class="comment">// pass ourselves, disguised as our mixin</span>
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<a name="l00175"></a>00175          <span class="comment">// protocol base, to the protocol user</span>
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<a name="l00176"></a>00176         }
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<a name="l00177"></a>00177
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<a name="l00178"></a>00178 <span class="keywordtype">void</span> CProtocolProvider::HandleEvent(TInt aEventCode)
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<a name="l00179"></a>00179         {
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<a name="l00180"></a>00180           <span class="comment">// A concrete implementation of the abstract protocol.</span>
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<a name="l00181"></a>00181           <span class="comment">// Handle an event in the protocol user</span>
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<a name="l00182"></a>00182         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat1,<span class="stringliteral">&quot;CProtocolProvider handling event %d\n&quot;</span>);
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<a name="l00183"></a>00183         console-&gt;Printf(KFormat1,aEventCode);
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<a name="l00184"></a>00184         }
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<a name="l00185"></a>00185
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<a name="l00186"></a>00186
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<a name="l00188"></a>00188 <span class="comment">//</span>
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   188
 
<a name="l00189"></a>00189 <span class="comment">// Do the example</span>
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<a name="l00190"></a>00190 <span class="comment">//</span>
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<a name="l00192"></a>00192 <span class="comment"></span>LOCAL_C <span class="keywordtype">void</span> doExampleL()
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   191
 
<a name="l00193"></a>00193     {
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   192
 
<a name="l00194"></a>00194           <span class="comment">// show use of mixin with simple class</span>
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<a name="l00195"></a>00195         CProtocolProvider* simpleProvider=CProtocolProvider::NewLC();
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<a name="l00196"></a>00196           <span class="comment">// call protocol user</span>
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<a name="l00197"></a>00197         simpleProvider-&gt;CallProtocolUser();
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   196
 
<a name="l00198"></a>00198           <span class="comment">// Remove simpleProvider from cleanup stack and destroy</span>
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<a name="l00199"></a>00199         CleanupStack::PopAndDestroy();
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<a name="l00200"></a>00200         }
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   199
 
</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>
MCL/sftools/depl/docscontent