Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_c_inverter_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/MessageQueueExample/Inverter/src/CInverter.cpp</h1><a href="_c_inverter_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">// The following class describes the Inverter class which recieves input </span>
<a name="l00015"></a>00015 <span class="comment">// through InverterInq and sends it to InverterOutQ after inverting the recieved words.</span>
<a name="l00016"></a>00016 <span class="comment">// It implements a periodic timer which opens the InverterInq every 10 seconds.</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019
<a name="l00020"></a>00020
<a name="l00025"></a>00025 <span class="preprocessor">#include "CInverter.h"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "e32keys.h"</span> <span class="comment">// for EKeyEscape.</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="comment">//Periodic timer interval of 10 seconds.</span>
<a name="l00029"></a>00029 <span class="keyword">const</span> TInt KPeriodicTimerInterval10Sec(10000000);
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="comment">//Error code to indicate Stop command.</span>
<a name="l00032"></a>00032 <span class="keyword">const</span> TInt KErrStop = -100;
<a name="l00033"></a>00033
<a name="l00037"></a><a class="code" href="class_c_inverter.html#a6a742db9903aabd02203d158e5905135">00037</a> <a class="code" href="class_c_inverter.html#a6a742db9903aabd02203d158e5905135">CInverter::~CInverter</a>()
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 <span class="keywordflow">if</span>(iTimer)
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 <span class="comment">// Calling Cancel without checking if the timer is active is safe</span>
<a name="l00042"></a>00042 iTimer->Cancel();
<a name="l00043"></a>00043 }
<a name="l00044"></a>00044 <span class="keyword">delete</span> iTimer;
<a name="l00045"></a>00045 iInMsgQ.Close();
<a name="l00046"></a>00046 iOutMsgQ.Close();
<a name="l00047"></a>00047 }
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <a class="code" href="class_c_inverter.html">CInverter</a>* CInverter::NewL()
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051 <a class="code" href="class_c_inverter.html">CInverter</a>* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave)<a class="code" href="class_c_inverter.html">CInverter</a>();
<a name="l00052"></a>00052 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00053"></a>00053 <span class="keyword">self</span>->ConstructL();
<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="l00060"></a><a class="code" href="class_c_inverter.html#a79ad184aaf5ee5bf48a8bb724a188614">00060</a> <span class="keywordtype">void</span> <a class="code" href="class_c_inverter.html#a79ad184aaf5ee5bf48a8bb724a188614">CInverter::ConstructL</a>()
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 <span class="comment">// Initialize the periodic timer.</span>
<a name="l00063"></a>00063 iTimer = CPeriodic::NewL(CActive::EPriorityIdle);
<a name="l00064"></a>00064 <span class="comment">// Start the periodic timer, when ever the time elapsed</span>
<a name="l00065"></a>00065 <span class="comment">// the StaticWake() will get called.</span>
<a name="l00066"></a>00066
<a name="l00067"></a>00067 iTimer->Start(KPeriodicTimerInterval10Sec, KPeriodicTimerInterval10Sec,TCallBack(<a class="code" href="class_c_inverter.html#a5eaf28a9caffc96fa285871dd1b52f97">StaticWake</a>, <span class="keyword">this</span>));
<a name="l00068"></a>00068
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070
<a name="l00075"></a><a class="code" href="class_c_inverter.html#a5eaf28a9caffc96fa285871dd1b52f97">00075</a> TInt <a class="code" href="class_c_inverter.html#a5eaf28a9caffc96fa285871dd1b52f97">CInverter::StaticWake</a>(TAny* aAny)
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 <a class="code" href="class_c_inverter.html">CInverter</a>* <span class="keyword">self</span> = <span class="keyword">static_cast<</span><a class="code" href="class_c_inverter.html">CInverter</a>*<span class="keyword">></span>( aAny );
<a name="l00078"></a>00078 TInt ret = <span class="keyword">self</span>->RecieveMsg();
<a name="l00079"></a>00079 <span class="keywordflow">if</span>(ret!= KErrStop) <span class="comment">//KErrStop indicates that system has to be stopped and no more messages to be sent.</span>
<a name="l00080"></a>00080 <span class="keyword">self</span>->SendMsg();
<a name="l00081"></a>00081 <span class="keywordflow">return</span> KErrNone; <span class="comment">// Return value ignored by CPeriodic</span>
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00090"></a><a class="code" href="class_c_inverter.html#a04f57f2574053f65550decfa5f5b0a81">00090</a> TInt <a class="code" href="class_c_inverter.html#a04f57f2574053f65550decfa5f5b0a81">CInverter::RecieveMsg</a>()
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="comment">//Opens the message queue input to the inverter.</span>
<a name="l00094"></a>00094 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KGlobalInverterInQ, <span class="stringliteral">"InverterInQ"</span>);
<a name="l00095"></a>00095 TInt ret = iInMsgQ.OpenGlobal(KGlobalInverterInQ);
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="keywordflow">if</span> (ret == KErrNone)
<a name="l00098"></a>00098 {
<a name="l00099"></a>00099 <span class="comment">//Recieve the message coming from the first process.</span>
<a name="l00100"></a>00100 iMsgQData.Zero();
<a name="l00101"></a>00101 iInMsgQ.ReceiveBlocking(iMsgQData);
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="comment">//If the recieved data indicates stop command, stop the system.</span>
<a name="l00104"></a>00104 <span class="keywordflow">if</span>(iMsgQData[0]==EKeyEscape)
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 this-><a class="code" href="class_c_inverter.html#a5b46657c2749a4a0b364e5fb54a272de">Stop</a>();
<a name="l00107"></a>00107 <span class="keywordflow">return</span> KErrStop;
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110 <span class="keywordflow">return</span> KErrNone;
<a name="l00111"></a>00111 }
<a name="l00112"></a>00112
<a name="l00116"></a><a class="code" href="class_c_inverter.html#afa8f1fa7a66c8f8aa461f84316fe4a0e">00116</a> <span class="keywordtype">void</span> <a class="code" href="class_c_inverter.html#afa8f1fa7a66c8f8aa461f84316fe4a0e">CInverter::SendMsg</a>()
<a name="l00117"></a>00117 {
<a name="l00118"></a>00118 <span class="comment">//Opens the global message Queue named InverterOutQ.</span>
<a name="l00119"></a>00119 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KGlobalInverterOutQ, <span class="stringliteral">"InverterOutQ"</span>);
<a name="l00120"></a>00120 TInt ret = iOutMsgQ.OpenGlobal(KGlobalInverterOutQ);
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">//Sends the inverted words to the opened message queue.</span>
<a name="l00123"></a>00123 <span class="keywordflow">if</span> (ret == KErrNone)
<a name="l00124"></a>00124 {
<a name="l00125"></a>00125 <a class="code" href="class_c_inverter.html#a120fb0b63f1b40f9ec514733724e8824">DoInvert</a>();
<a name="l00126"></a>00126 iOutMsgQ.SendBlocking(idestMsg);
<a name="l00127"></a>00127 }
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
<a name="l00133"></a><a class="code" href="class_c_inverter.html#a120fb0b63f1b40f9ec514733724e8824">00133</a> <span class="keywordtype">void</span> <a class="code" href="class_c_inverter.html#a120fb0b63f1b40f9ec514733724e8824">CInverter::DoInvert</a>()
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135 idestMsg.Zero();
<a name="l00136"></a>00136 TInt i=0;
<a name="l00137"></a>00137 <span class="keywordflow">while</span>(iMsgQData[i]!= <span class="charliteral">'\r'</span>)
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 <span class="keywordflow">while</span>((iMsgQData[i]!= <span class="charliteral">' '</span>)&&(iMsgQData[i]!= <span class="charliteral">'\r'</span>))
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 iwords.Append(iMsgQData[i]);
<a name="l00142"></a>00142 i++;
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 <a class="code" href="class_c_inverter.html#a685b043131942beefd2f4fc886379475">ReverseWord</a>(iwords);
<a name="l00145"></a>00145 idestMsg.Append(itmpWord);
<a name="l00146"></a>00146 idestMsg.Append(<span class="charliteral">' '</span>);
<a name="l00147"></a>00147 <span class="keywordflow">if</span>(iMsgQData[i]== <span class="charliteral">'\r'</span>)
<a name="l00148"></a>00148 {
<a name="l00149"></a>00149 i--;
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151 i++;
<a name="l00152"></a>00152 iwords.Zero();
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155
<a name="l00159"></a><a class="code" href="class_c_inverter.html#a685b043131942beefd2f4fc886379475">00159</a> <span class="keywordtype">void</span> <a class="code" href="class_c_inverter.html#a685b043131942beefd2f4fc886379475">CInverter::ReverseWord</a>(TBuf<20> buf)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 itmpWord.Zero();
<a name="l00162"></a>00162 TInt size = (buf.Size())/2;
<a name="l00163"></a>00163 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=1; i<= size; i++)
<a name="l00164"></a>00164 {
<a name="l00165"></a>00165 itmpWord.Append(buf[size -i]);
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167 }
<a name="l00168"></a>00168
<a name="l00173"></a><a class="code" href="class_c_inverter.html#a5b46657c2749a4a0b364e5fb54a272de">00173</a> <span class="keywordtype">void</span> <a class="code" href="class_c_inverter.html#a5b46657c2749a4a0b364e5fb54a272de">CInverter::Stop</a>()
<a name="l00174"></a>00174 {
<a name="l00175"></a>00175 iTimer->Cancel();
<a name="l00176"></a>00176 <a class="code" href="class_c_inverter.html#a5b46657c2749a4a0b364e5fb54a272de">CActiveScheduler::Stop</a>();
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178
<a name="l00179"></a>00179 LOCAL_C <span class="keywordtype">void</span> DoStartL()
<a name="l00180"></a>00180 {
<a name="l00181"></a>00181
<a name="l00182"></a>00182 CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler();
<a name="l00183"></a>00183 CleanupStack::PushL(scheduler);
<a name="l00184"></a>00184 CActiveScheduler::Install(scheduler);
<a name="l00185"></a>00185
<a name="l00186"></a>00186 <a class="code" href="class_c_inverter.html">CInverter</a>* invert = CInverter::NewL();
<a name="l00187"></a>00187 CleanupStack::PushL(invert);
<a name="l00188"></a>00188
<a name="l00189"></a>00189 <span class="comment">//Start the scheduler for the periodic timer</span>
<a name="l00190"></a>00190 CActiveScheduler::Start();
<a name="l00191"></a>00191
<a name="l00192"></a>00192 CleanupStack::PopAndDestroy(invert);
<a name="l00193"></a>00193 CleanupStack::PopAndDestroy(scheduler);
<a name="l00194"></a>00194 }
<a name="l00195"></a>00195
<a name="l00196"></a><a class="code" href="_c_inverter_8cpp.html#a0f358e9c4355138f629b8c4f37310295">00196</a> GLDEF_C TInt E32Main()
<a name="l00197"></a>00197 {
<a name="l00198"></a>00198 __UHEAP_MARK;
<a name="l00199"></a>00199 CTrapCleanup* cleanup = CTrapCleanup::New();
<a name="l00200"></a>00200 <span class="keywordflow">if</span>(cleanup == NULL)
<a name="l00201"></a>00201 {
<a name="l00202"></a>00202 <span class="keywordflow">return</span> KErrNoMemory;
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204
<a name="l00205"></a>00205
<a name="l00206"></a>00206 TRAPD(mainError, DoStartL());
<a name="l00207"></a>00207 <span class="keywordflow">if</span>(mainError != KErrNone)
<a name="l00208"></a>00208 {
<a name="l00209"></a>00209 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KUserPanic,<span class="stringliteral">"Failed to complete"</span>);
<a name="l00210"></a>00210 User::Panic(KUserPanic, mainError);
<a name="l00211"></a>00211 }
<a name="l00212"></a>00212
<a name="l00213"></a>00213 <span class="keyword">delete</span> cleanup;
<a name="l00214"></a>00214 __UHEAP_MARKEND;
<a name="l00215"></a>00215 <span class="keywordflow">return</span> KErrNone;
<a name="l00216"></a>00216 }
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