Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/subscribestd_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/pubsub/subscribestd.cpp</h1><a href="subscribestd_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 standard state pattern of subscribing to a byte-array 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="subscribe_8h.html">subscribe.h</a>"</span>
<a name="l00024"></a>00024 LOCAL_D CConsoleBase* console;
<a name="l00025"></a>00025
<a name="l00029"></a>00029 CArrayPropertyWatch::CArrayPropertyWatch():CActive(EPriority)
<a name="l00030"></a>00030 {
<a name="l00031"></a>00031 }
<a name="l00032"></a>00032
<a name="l00037"></a>00037 <span class="keywordtype">void</span> CArrayPropertyWatch::ConstructL(CConsoleBase* aConsole)
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 User::LeaveIfError(iProperty.Attach(KMyPropertyCat,KMyPropertyName));
<a name="l00040"></a>00040 iConsole = aConsole;
<a name="l00041"></a>00041 CActiveScheduler::Add(<span class="keyword">this</span>);
<a name="l00042"></a>00042 }
<a name="l00043"></a>00043
<a name="l00049"></a>00049 <a class="code" href="class_c_array_property_watch.html">CArrayPropertyWatch</a>* <a class="code" href="class_c_array_property_watch.html#a54b576da65400b50b8845f0ea8ad5c8e">CArrayPropertyWatch::NewL</a>(CConsoleBase* aConsole)
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051 <a class="code" href="class_c_array_property_watch.html">CArrayPropertyWatch</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_array_property_watch.html">CArrayPropertyWatch</a>;
<a name="l00052"></a>00052 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00053"></a>00053 <span class="keyword">self</span>->ConstructL(aConsole);
<a name="l00054"></a>00054 CleanupStack::Pop(<span class="keyword">self</span>);
<a name="l00055"></a>00055 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057
<a name="l00061"></a>00061 CArrayPropertyWatch::~CArrayPropertyWatch()
<a name="l00062"></a>00062 {
<a name="l00063"></a>00063 iProperty.Close();
<a name="l00064"></a>00064 Cancel();
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066
<a name="l00070"></a>00070 <span class="keywordtype">void</span> CArrayPropertyWatch::DoCancel()
<a name="l00071"></a>00071 {
<a name="l00072"></a>00072 iProperty.Cancel();
<a name="l00073"></a>00073 }
<a name="l00074"></a>00074
<a name="l00079"></a>00079 <span class="keywordtype">void</span> CArrayPropertyWatch::RunL()
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081 <span class="comment">// Get the value of the property</span>
<a name="l00082"></a>00082 TBuf16<KArraySize> buf;
<a name="l00083"></a>00083 TInt err = iProperty.Get(buf);
<a name="l00084"></a>00084 <span class="keywordflow">if</span>(err == KErrNotFound)
<a name="l00085"></a>00085 {
<a name="l00086"></a>00086 <span class="comment">// Leave the function if the property is not defined</span>
<a name="l00087"></a>00087 CActiveScheduler::Stop();
<a name="l00088"></a>00088 User::Leave(err);
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090 <span class="keywordflow">else</span>
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092 <span class="keywordflow">if</span>(buf == KStop)
<a name="l00093"></a>00093 {
<a name="l00094"></a>00094 CActiveScheduler::Stop();
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096 <span class="keywordflow">else</span>
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098 <span class="comment">// Re-subscribe to the property</span>
<a name="l00099"></a>00099 <a class="code" href="class_c_array_property_watch.html#afd703433c800398b4e9b82aa348a3164">WatchL</a>();
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103
<a name="l00108"></a>00108 <span class="keywordtype">void</span> CArrayPropertyWatch::PrintProperty(TDes16& aBuf)
<a name="l00109"></a>00109 {
<a name="l00110"></a>00110 iConsole->Printf(KTxtArray);
<a name="l00111"></a>00111 TInt bufLength = aBuf.Length();
<a name="l00112"></a>00112 <span class="keywordflow">for</span>(TInt ix = 0; ix < bufLength;ix++)
<a name="l00113"></a>00113 {
<a name="l00114"></a>00114 iConsole->Printf(KTxtArrayElement,aBuf[ix]);
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116 iConsole->Printf(KTxtNewLine);
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00122"></a><a class="code" href="class_c_array_property_watch.html#afd703433c800398b4e9b82aa348a3164">00122</a> <span class="keywordtype">void</span> <a class="code" href="class_c_array_property_watch.html#afd703433c800398b4e9b82aa348a3164">CArrayPropertyWatch::WatchL</a>()
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 <span class="comment">// Get the value of the property</span>
<a name="l00125"></a>00125 TBuf16<KArraySize> buf;
<a name="l00126"></a>00126 TInt err = iProperty.Get(buf);
<a name="l00127"></a>00127 <span class="keywordflow">if</span>(err == KErrNotFound)
<a name="l00128"></a>00128 {
<a name="l00129"></a>00129 <span class="comment">// Leave if the property is not found</span>
<a name="l00130"></a>00130 User::Leave(err);
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 PrintProperty(buf);
<a name="l00133"></a>00133 <span class="comment">// Subscribe to the property</span>
<a name="l00134"></a>00134 iProperty.Subscribe(iStatus);
<a name="l00135"></a>00135 <span class="comment">// Issue an outstanding request</span>
<a name="l00136"></a>00136 SetActive();
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="keywordtype">void</span> DoExampleL()
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler();
<a name="l00142"></a>00142 CleanupStack::PushL(scheduler);
<a name="l00143"></a>00143 CActiveScheduler::Install(scheduler);
<a name="l00144"></a>00144
<a name="l00145"></a>00145 console->Printf(KTxtSpecSt);
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="comment">// Create the byte-array property watch active object</span>
<a name="l00148"></a>00148 <a class="code" href="class_c_array_property_watch.html">CArrayPropertyWatch</a>* obj = <a class="code" href="class_c_array_property_watch.html#a54b576da65400b50b8845f0ea8ad5c8e">CArrayPropertyWatch::NewL</a>(console);
<a name="l00149"></a>00149 CleanupStack::PushL(obj);
<a name="l00150"></a>00150
<a name="l00151"></a>00151 <span class="comment">// Subscribe to the property and start the scheduler</span>
<a name="l00152"></a>00152 obj-><a class="code" href="class_c_array_property_watch.html#afd703433c800398b4e9b82aa348a3164">WatchL</a>();
<a name="l00153"></a>00153 CActiveScheduler::Start();
<a name="l00154"></a>00154
<a name="l00155"></a>00155 CleanupStack::PopAndDestroy(obj);
<a name="l00156"></a>00156 CleanupStack::PopAndDestroy(scheduler);
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158
<a name="l00159"></a><a class="code" href="subscribestd_8cpp.html#a0f358e9c4355138f629b8c4f37310295">00159</a> GLDEF_C TInt E32Main()
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 __UHEAP_MARK;
<a name="l00162"></a>00162 CTrapCleanup* cleanup = CTrapCleanup::New();
<a name="l00163"></a>00163
<a name="l00164"></a>00164 TRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize(KConsFullScreen,KConsFullScreen)));
<a name="l00165"></a>00165 <span class="keywordflow">if</span> (createError)
<a name="l00166"></a>00166 <span class="keywordflow">return</span> createError;
<a name="l00167"></a>00167
<a name="l00168"></a>00168 TRAPD(mainError, DoExampleL());
<a name="l00169"></a>00169 <span class="keywordflow">if</span> (mainError)
<a name="l00170"></a>00170 console->Printf(KTextFailed, mainError);
<a name="l00171"></a>00171 console->Printf(KTextPressAnyKey);
<a name="l00172"></a>00172 console->Getch();
<a name="l00173"></a>00173
<a name="l00174"></a>00174 <span class="keyword">delete</span> console;
<a name="l00175"></a>00175 <span class="keyword">delete</span> cleanup;
<a name="l00176"></a>00176 __UHEAP_MARKEND;
<a name="l00177"></a>00177 <span class="keywordflow">return</span> KErrNone;
<a name="l00178"></a>00178 }
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