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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/subscribepe_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/pubsub/subscribepe.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/pubsub/subscribepe.cpp</h1><a href="subscribepe_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2008-2009 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">// Demonstrates the pure event pattern of subscribing to an integer property</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
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<a name="l00018"></a>00018
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<a name="l00023"></a>00023 <span class="preprocessor">#include &quot;<a class="code" href="subscribepe_8h.html">subscribepe.h</a>&quot;</span>
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<a name="l00024"></a>00024
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<a name="l00025"></a>00025 LOCAL_D CConsoleBase* console;
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<a name="l00026"></a>00026
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<a name="l00030"></a>00030 CIntPropertyWatch::CIntPropertyWatch():CActive(EPriority)
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<a name="l00031"></a>00031         {
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<a name="l00032"></a>00032         }
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<a name="l00033"></a>00033
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<a name="l00038"></a>00038 <span class="keywordtype">void</span> CIntPropertyWatch::ConstructL(CConsoleBase* aConsole)
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<a name="l00039"></a>00039         {
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<a name="l00040"></a>00040         User::LeaveIfError(iProperty.Attach(KMyPropertyCat,KMyPropertyName));
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<a name="l00041"></a>00041         iConsole = aConsole;
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<a name="l00042"></a>00042         CActiveScheduler::Add(<span class="keyword">this</span>);
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<a name="l00043"></a>00043         }
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<a name="l00044"></a>00044
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<a name="l00050"></a><a class="code" href="class_c_int_property_watch.html#a1c80ac74f96112ac7da19fff62c8ee03">00050</a> <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>* <a class="code" href="class_c_int_property_watch.html#a1c80ac74f96112ac7da19fff62c8ee03">CIntPropertyWatch::NewL</a>(CConsoleBase* aConsole)
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<a name="l00051"></a>00051         {
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<a name="l00052"></a>00052         <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>;
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<a name="l00053"></a>00053         CleanupStack::PushL(<span class="keyword">self</span>);
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<a name="l00054"></a>00054         <span class="keyword">self</span>-&gt;ConstructL(aConsole);
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<a name="l00055"></a>00055         CleanupStack::Pop(<span class="keyword">self</span>);
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<a name="l00056"></a>00056         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00057"></a>00057         }
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<a name="l00058"></a>00058
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<a name="l00062"></a>00062 CIntPropertyWatch::~CIntPropertyWatch()
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<a name="l00063"></a>00063         {
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<a name="l00064"></a>00064         iProperty.Close();
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<a name="l00065"></a>00065         Cancel();
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<a name="l00066"></a>00066         }
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<a name="l00067"></a>00067
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<a name="l00071"></a>00071 <span class="keywordtype">void</span> CIntPropertyWatch::DoCancel()
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<a name="l00072"></a>00072         {
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<a name="l00073"></a>00073         iProperty.Cancel();
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<a name="l00074"></a>00074         }
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<a name="l00075"></a>00075
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<a name="l00080"></a>00080 <span class="keywordtype">void</span> CIntPropertyWatch::RunL()
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<a name="l00081"></a>00081         {
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<a name="l00082"></a>00082         <span class="comment">// Receive a notification when a value is published</span>
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<a name="l00083"></a>00083         <span class="comment">// The RProperty::Get() function call can be omitted as the published value is of no importance in the pure event pattern</span>
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<a name="l00084"></a>00084         TInt value;
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<a name="l00085"></a>00085         TInt err = iProperty.Get(value);
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<a name="l00086"></a>00086         <span class="keywordflow">if</span> (err == KErrNotFound)
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<a name="l00087"></a>00087                 {
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<a name="l00088"></a>00088                 <span class="comment">// No need to re-subscribe to the property as it has been deleted by the publisher</span>
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<a name="l00089"></a>00089                 CActiveScheduler::Stop();
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<a name="l00090"></a>00090                 }
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<a name="l00091"></a>00091         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (err == KErrNone)
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<a name="l00092"></a>00092                 {
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<a name="l00093"></a>00093                 <span class="comment">// Print the value of the property</span>
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<a name="l00094"></a>00094                 PrintProperty(value);
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<a name="l00095"></a>00095                 <span class="comment">// Re-subscribe to the property</span>
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<a name="l00096"></a>00096                 <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">IssueRequest</a>();
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<a name="l00097"></a>00097                 }
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<a name="l00098"></a>00098         <span class="keywordflow">else</span>
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<a name="l00099"></a>00099                 {
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<a name="l00100"></a>00100                 <span class="comment">// Leave the function in case of any other error</span>
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<a name="l00101"></a>00101                 CActiveScheduler::Stop();
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<a name="l00102"></a>00102                 User::Leave(err);
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<a name="l00103"></a>00103                 }
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<a name="l00104"></a>00104         }
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<a name="l00105"></a>00105
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<a name="l00110"></a>00110 <span class="keywordtype">void</span> CIntPropertyWatch::PrintProperty(TInt aValue)
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<a name="l00111"></a>00111         {
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<a name="l00112"></a>00112         iConsole-&gt;Printf(KTxtValChange,aValue);
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<a name="l00113"></a>00113         }
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<a name="l00114"></a>00114
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<a name="l00119"></a><a class="code" href="class_c_int_property_watch.html#a4d0ef36ddc6bd9c7fc0566656a442e10">00119</a> <span class="keywordtype">void</span> <a class="code" href="class_c_int_property_watch.html#a4d0ef36ddc6bd9c7fc0566656a442e10">CIntPropertyWatch::WatchL</a>()
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<a name="l00120"></a>00120         {
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<a name="l00121"></a>00121         TInt value;
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<a name="l00122"></a>00122         <span class="comment">// Checks if the property exists</span>
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<a name="l00123"></a>00123         TInt res = iProperty.Get(value);
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<a name="l00124"></a>00124         <span class="keywordflow">if</span> (res == KErrNotFound)
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<a name="l00125"></a>00125                 {
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<a name="l00126"></a>00126                 <span class="comment">// Property not defined</span>
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<a name="l00127"></a>00127                 User::Leave(res);
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<a name="l00128"></a>00128                 }
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<a name="l00129"></a>00129         <span class="comment">// Prints the value of the property</span>
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<a name="l00130"></a>00130         <span class="comment">// This is only to illustrate that the value of the property is set by the publisher</span>
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<a name="l00131"></a>00131         <span class="comment">// This value has no significance as the pure event distribution pattern of publish and subscribe is being followed</span>
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<a name="l00132"></a>00132         PrintProperty(value);
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<a name="l00133"></a>00133         <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">IssueRequest</a>();
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<a name="l00134"></a>00134         }
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<a name="l00135"></a>00135
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<a name="l00139"></a><a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">00139</a> <span class="keywordtype">void</span> <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">CIntPropertyWatch::IssueRequest</a>()
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<a name="l00140"></a>00140         {
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<a name="l00141"></a>00141         iProperty.Subscribe(iStatus);
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<a name="l00142"></a>00142         SetActive();
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<a name="l00143"></a>00143         }
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<a name="l00144"></a>00144
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<a name="l00145"></a>00145 <span class="keywordtype">void</span> DoExampleL()
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<a name="l00146"></a>00146         {
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<a name="l00147"></a>00147         CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler();
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<a name="l00148"></a>00148         CleanupStack::PushL(scheduler);
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<a name="l00149"></a>00149         CActiveScheduler::Install(scheduler);
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<a name="l00150"></a>00150
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<a name="l00151"></a>00151         console-&gt;Printf(KTxtPESub);
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<a name="l00152"></a>00152
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<a name="l00153"></a>00153         <span class="comment">// Create the integer property watch active object</span>
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<a name="l00154"></a>00154         <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>* obj = <a class="code" href="class_c_int_property_watch.html#a1c80ac74f96112ac7da19fff62c8ee03">CIntPropertyWatch::NewL</a>(console);
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<a name="l00155"></a>00155         CleanupStack::PushL(obj);
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<a name="l00156"></a>00156
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<a name="l00157"></a>00157         <span class="comment">// Subscribe to the property and start the scheduler</span>
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<a name="l00158"></a>00158         obj-&gt;<a class="code" href="class_c_int_property_watch.html#a4d0ef36ddc6bd9c7fc0566656a442e10">WatchL</a>();
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<a name="l00159"></a>00159         CActiveScheduler::Start();
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<a name="l00160"></a>00160
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<a name="l00161"></a>00161         CleanupStack::PopAndDestroy(obj);
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<a name="l00162"></a>00162         CleanupStack::PopAndDestroy(scheduler);
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<a name="l00163"></a>00163         }
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<a name="l00164"></a>00164
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<a name="l00165"></a><a class="code" href="subscribepe_8cpp.html#a0f358e9c4355138f629b8c4f37310295">00165</a> GLDEF_C TInt E32Main()
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<a name="l00166"></a>00166         {
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<a name="l00167"></a>00167         __UHEAP_MARK;
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<a name="l00168"></a>00168         CTrapCleanup* cleanup = CTrapCleanup::New();
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<a name="l00169"></a>00169
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<a name="l00170"></a>00170         TRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize(KConsFullScreen,KConsFullScreen)));
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<a name="l00171"></a>00171         <span class="keywordflow">if</span> (createError)
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<a name="l00172"></a>00172                 <span class="keywordflow">return</span> createError;
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<a name="l00173"></a>00173
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<a name="l00174"></a>00174         TRAPD(mainError, DoExampleL());
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<a name="l00175"></a>00175         <span class="keywordflow">if</span> (mainError)
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<a name="l00176"></a>00176                 console-&gt;Printf(KTextFailed, mainError);
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<a name="l00177"></a>00177         console-&gt;Printf(KTextPressAnyKey);
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<a name="l00178"></a>00178         console-&gt;Getch();
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<a name="l00179"></a>00179
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<a name="l00180"></a>00180         <span class="keyword">delete</span> console;
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<a name="l00181"></a>00181         <span class="keyword">delete</span> cleanup;
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<a name="l00182"></a>00182         __UHEAP_MARKEND;
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<a name="l00183"></a>00183         <span class="keywordflow">return</span> KErrNone;
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<a name="l00184"></a>00184         }
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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>
MCL/sftools/depl/docscontent