Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/subscribepe_8cpp_source.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<title>TB9.2 Example Applications: examples/Base/IPC/pubsub/subscribepe.cpp Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link href="doxygen.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<!-- Generated by Doxygen 1.6.2 -->
<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>
<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">// Demonstrates the pure event pattern of subscribing to an integer property</span>
<a name="l00015"></a>00015 <span class="comment">//</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017
<a name="l00018"></a>00018
<a name="l00023"></a>00023 <span class="preprocessor">#include "<a class="code" href="subscribepe_8h.html">subscribepe.h</a>"</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 LOCAL_D CConsoleBase* console;
<a name="l00026"></a>00026
<a name="l00030"></a>00030 CIntPropertyWatch::CIntPropertyWatch():CActive(EPriority)
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 }
<a name="l00033"></a>00033
<a name="l00038"></a>00038 <span class="keywordtype">void</span> CIntPropertyWatch::ConstructL(CConsoleBase* aConsole)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040 User::LeaveIfError(iProperty.Attach(KMyPropertyCat,KMyPropertyName));
<a name="l00041"></a>00041 iConsole = aConsole;
<a name="l00042"></a>00042 CActiveScheduler::Add(<span class="keyword">this</span>);
<a name="l00043"></a>00043 }
<a name="l00044"></a>00044
<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)
<a name="l00051"></a>00051 {
<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>;
<a name="l00053"></a>00053 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00054"></a>00054 <span class="keyword">self</span>->ConstructL(aConsole);
<a name="l00055"></a>00055 CleanupStack::Pop(<span class="keyword">self</span>);
<a name="l00056"></a>00056 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058
<a name="l00062"></a>00062 CIntPropertyWatch::~CIntPropertyWatch()
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064 iProperty.Close();
<a name="l00065"></a>00065 Cancel();
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067
<a name="l00071"></a>00071 <span class="keywordtype">void</span> CIntPropertyWatch::DoCancel()
<a name="l00072"></a>00072 {
<a name="l00073"></a>00073 iProperty.Cancel();
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00080"></a>00080 <span class="keywordtype">void</span> CIntPropertyWatch::RunL()
<a name="l00081"></a>00081 {
<a name="l00082"></a>00082 <span class="comment">// Receive a notification when a value is published</span>
<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>
<a name="l00084"></a>00084 TInt value;
<a name="l00085"></a>00085 TInt err = iProperty.Get(value);
<a name="l00086"></a>00086 <span class="keywordflow">if</span> (err == KErrNotFound)
<a name="l00087"></a>00087 {
<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>
<a name="l00089"></a>00089 CActiveScheduler::Stop();
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (err == KErrNone)
<a name="l00092"></a>00092 {
<a name="l00093"></a>00093 <span class="comment">// Print the value of the property</span>
<a name="l00094"></a>00094 PrintProperty(value);
<a name="l00095"></a>00095 <span class="comment">// Re-subscribe to the property</span>
<a name="l00096"></a>00096 <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">IssueRequest</a>();
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 <span class="keywordflow">else</span>
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 <span class="comment">// Leave the function in case of any other error</span>
<a name="l00101"></a>00101 CActiveScheduler::Stop();
<a name="l00102"></a>00102 User::Leave(err);
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105
<a name="l00110"></a>00110 <span class="keywordtype">void</span> CIntPropertyWatch::PrintProperty(TInt aValue)
<a name="l00111"></a>00111 {
<a name="l00112"></a>00112 iConsole->Printf(KTxtValChange,aValue);
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114
<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>()
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121 TInt value;
<a name="l00122"></a>00122 <span class="comment">// Checks if the property exists</span>
<a name="l00123"></a>00123 TInt res = iProperty.Get(value);
<a name="l00124"></a>00124 <span class="keywordflow">if</span> (res == KErrNotFound)
<a name="l00125"></a>00125 {
<a name="l00126"></a>00126 <span class="comment">// Property not defined</span>
<a name="l00127"></a>00127 User::Leave(res);
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 <span class="comment">// Prints the value of the property</span>
<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>
<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>
<a name="l00132"></a>00132 PrintProperty(value);
<a name="l00133"></a>00133 <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">IssueRequest</a>();
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135
<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>()
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 iProperty.Subscribe(iStatus);
<a name="l00142"></a>00142 SetActive();
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144
<a name="l00145"></a>00145 <span class="keywordtype">void</span> DoExampleL()
<a name="l00146"></a>00146 {
<a name="l00147"></a>00147 CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler();
<a name="l00148"></a>00148 CleanupStack::PushL(scheduler);
<a name="l00149"></a>00149 CActiveScheduler::Install(scheduler);
<a name="l00150"></a>00150
<a name="l00151"></a>00151 console->Printf(KTxtPESub);
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="comment">// Create the integer property watch active object</span>
<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);
<a name="l00155"></a>00155 CleanupStack::PushL(obj);
<a name="l00156"></a>00156
<a name="l00157"></a>00157 <span class="comment">// Subscribe to the property and start the scheduler</span>
<a name="l00158"></a>00158 obj-><a class="code" href="class_c_int_property_watch.html#a4d0ef36ddc6bd9c7fc0566656a442e10">WatchL</a>();
<a name="l00159"></a>00159 CActiveScheduler::Start();
<a name="l00160"></a>00160
<a name="l00161"></a>00161 CleanupStack::PopAndDestroy(obj);
<a name="l00162"></a>00162 CleanupStack::PopAndDestroy(scheduler);
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164
<a name="l00165"></a><a class="code" href="subscribepe_8cpp.html#a0f358e9c4355138f629b8c4f37310295">00165</a> GLDEF_C TInt E32Main()
<a name="l00166"></a>00166 {
<a name="l00167"></a>00167 __UHEAP_MARK;
<a name="l00168"></a>00168 CTrapCleanup* cleanup = CTrapCleanup::New();
<a name="l00169"></a>00169
<a name="l00170"></a>00170 TRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize(KConsFullScreen,KConsFullScreen)));
<a name="l00171"></a>00171 <span class="keywordflow">if</span> (createError)
<a name="l00172"></a>00172 <span class="keywordflow">return</span> createError;
<a name="l00173"></a>00173
<a name="l00174"></a>00174 TRAPD(mainError, DoExampleL());
<a name="l00175"></a>00175 <span class="keywordflow">if</span> (mainError)
<a name="l00176"></a>00176 console->Printf(KTextFailed, mainError);
<a name="l00177"></a>00177 console->Printf(KTextPressAnyKey);
<a name="l00178"></a>00178 console->Getch();
<a name="l00179"></a>00179
<a name="l00180"></a>00180 <span class="keyword">delete</span> console;
<a name="l00181"></a>00181 <span class="keyword">delete</span> cleanup;
<a name="l00182"></a>00182 __UHEAP_MARKEND;
<a name="l00183"></a>00183 <span class="keywordflow">return</span> KErrNone;
<a name="l00184"></a>00184 }
</pre></div></div>
<hr size="1"/><address style="text-align: right;"><small>Generated by
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
</body>
</html>