Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/deltaque_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/ArraysAndLists/linkedlist/deltaque/src/deltaque.cpp</h1><a href="deltaque_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">// Contains the E32Main() function, which executes the example.</span>
<a name="l00015"></a>00015 <span class="comment">// The example demonstrates the use of the TDeltaQue class, which represents</span>
<a name="l00016"></a>00016 <span class="comment">// a delta queue.</span>
<a name="l00017"></a>00017 <span class="comment">// An object of the CPeriodic class generates periodic timer events.</span>
<a name="l00018"></a>00018 <span class="comment">// Either the tick count is added to the delta queue or</span>
<a name="l00019"></a>00019 <span class="comment">// elements are removed from the list, depending on the state of the queue.</span>
<a name="l00020"></a>00020 <span class="comment">// The user can stop the generation of timer events by pressing a key.</span>
<a name="l00021"></a>00021 <span class="comment">//</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023
<a name="l00024"></a>00024
<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="_i_p_c_2condvar_2condvarlocal_2inc_2userinterface_8h.html">userinterface.h</a>"</span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 LOCAL_D CConsoleBase* console;
<a name="l00032"></a>00032
<a name="l00033"></a>00033 LOCAL_C <span class="keywordtype">void</span> DoStartL();
<a name="l00034"></a>00034 LOCAL_C <span class="keywordtype">void</span> CallExampleL();
<a name="l00035"></a>00035
<a name="l00036"></a>00036 LOCAL_C <span class="keywordtype">void</span> DoStartL()
<a name="l00037"></a>00037 {
<a name="l00038"></a>00038 <span class="comment">// Create and install the active scheduler.</span>
<a name="l00039"></a>00039 CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler();
<a name="l00040"></a>00040 CleanupStack::PushL(scheduler);
<a name="l00041"></a>00041 CActiveScheduler::Install(scheduler);
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextExample, <span class="stringliteral">"Delta Queue Example\nCreating and starting timer object\n"</span>);
<a name="l00044"></a>00044 console->Printf(KTextExample);
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="comment">// Create an object of the CTimerEntry class.</span>
<a name="l00047"></a>00047 <a class="code" href="class_c_timer_entry.html">CTimerEntry</a>* entry = <a class="code" href="class_c_timer_entry.html#ae9239b3945aa446c00506024551a8268">CTimerEntry::NewL</a>(console);
<a name="l00048"></a>00048 CleanupStack::PushL(entry);
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="comment">// Create an object of the CUserInterface class.</span>
<a name="l00051"></a>00051 <a class="code" href="class_c_user_interface.html">CUserInterface</a>* interface = <a class="code" href="class_c_user_interface.html#acb29c660858994d24137bb413fee4af8">CUserInterface::NewL</a>(console,entry);
<a name="l00052"></a>00052 CleanupStack::PushL(interface);
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="comment">// Wait for a key press from the user.</span>
<a name="l00055"></a>00055 <span class="comment">// Generate an asynchronous read request.</span>
<a name="l00056"></a>00056 interface-><a class="code" href="class_c_user_interface.html#a9f9158c56f74b7c8da6c527f346c9952">ReadFunc</a>();
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">// Start the active scheduler.</span>
<a name="l00059"></a>00059 CActiveScheduler::Start();
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">// Destroy the objects in the cleanup stack.</span>
<a name="l00062"></a>00062 CleanupStack::PopAndDestroy(3,scheduler); <span class="comment">// interface, entry, scheduler.</span>
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064
<a name="l00065"></a>00065 GLDEF_C TInt E32Main() <span class="comment">// main function called by E32</span>
<a name="l00066"></a>00066 {
<a name="l00067"></a>00067 __UHEAP_MARK;
<a name="l00068"></a>00068 CTrapCleanup* cleanup=CTrapCleanup::New(); <span class="comment">// get clean-up stack</span>
<a name="l00069"></a>00069 TRAPD(error, CallExampleL()); <span class="comment">// more initialization, then do example</span>
<a name="l00070"></a>00070 <span class="keyword">delete</span> cleanup; <span class="comment">// destroy clean-up stack</span>
<a name="l00071"></a>00071 __ASSERT_ALWAYS(!error, User::Panic(KTxtEPOC32EX, error));
<a name="l00072"></a>00072 __UHEAP_MARKEND;
<a name="l00073"></a>00073 <span class="keywordflow">return</span> 0; <span class="comment">// and return</span>
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a>00076 LOCAL_C <span class="keywordtype">void</span> CallExampleL() <span class="comment">// initialize and call example code under cleanup stack</span>
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 console=Console::NewL(KTxtExampleCode, TSize(KConsFullScreen, KConsFullScreen));
<a name="l00079"></a>00079 CleanupStack::PushL(console);
<a name="l00080"></a>00080 TRAPD(error, DoStartL()); <span class="comment">// perform example function</span>
<a name="l00081"></a>00081 <span class="keywordflow">if</span> (error)
<a name="l00082"></a>00082 console->Printf(KFormatFailed, error);
<a name="l00083"></a>00083 <span class="keywordflow">else</span>
<a name="l00084"></a>00084 console->Printf(KTxtOK);
<a name="l00085"></a>00085 console->Printf(KTextPressAnyKey);
<a name="l00086"></a>00086 console->Getch(); <span class="comment">// get and ignore character</span>
<a name="l00087"></a>00087 CleanupStack::PopAndDestroy(); <span class="comment">// close console</span>
<a name="l00088"></a>00088 }
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