author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Tue, 30 Mar 2010 16:16:55 +0100 | |
changeset 6 | 43e37759235e |
permissions | -rw-r--r-- |
6
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Week 12 contribution of example code"
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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/MemMan/Cleanup/ErrorOnFail/ErrorOnFail.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/MemMan/Cleanup/ErrorOnFail/ErrorOnFail.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2000-2009 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 "Eclipse Public License v1.0"</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 "http://www.eclipse.org/legal/epl-v10.html".</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">// Example shows attempt to construct an object and return an</span> |
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<a name="l00015"></a>00015 <span class="comment">// appropriate error code on failure.</span> |
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<a name="l00016"></a>00016 <span class="comment">// NOTE: the structure of this example is different to standard E32 examples</span> |
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<a name="l00017"></a>00017 <span class="comment">//</span> |
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<a name="l00018"></a>00018 |
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<a name="l00019"></a>00019 |
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<a name="l00020"></a>00020 <span class="preprocessor">#include <e32cons.h></span> |
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<a name="l00021"></a>00021 |
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<a name="l00022"></a>00022 |
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<a name="l00023"></a>00023 <span class="comment">//</span> |
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<a name="l00024"></a>00024 <span class="comment">// Common formats</span> |
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<a name="l00025"></a>00025 <span class="comment">//</span> |
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<a name="l00026"></a>00026 |
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<a name="l00027"></a>00027 |
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<a name="l00028"></a>00028 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KCommonFormat1,<span class="stringliteral">"Value of iInt is %d.\n"</span>); |
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<a name="l00029"></a>00029 |
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<a name="l00030"></a>00030 |
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<a name="l00031"></a>00031 <span class="comment">// All messages written to this</span> |
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<a name="l00032"></a>00032 LOCAL_D CConsoleBase* console; |
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<a name="l00033"></a>00033 |
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<a name="l00034"></a>00034 <span class="comment">// Flag which determines whether the doSomething() member function</span> |
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<a name="l00035"></a>00035 <span class="comment">// of the CExample class should leave when called.</span> |
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<a name="l00036"></a>00036 LOCAL_D TBool leaveFlag = ETrue; |
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<a name="l00037"></a>00037 |
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<a name="l00038"></a>00038 <span class="comment">// Parameter for __UHEAP_SETFAIL</span> |
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<a name="l00039"></a>00039 <span class="comment">// Allocation guaranteed to fail at this number of allocation attempts;</span> |
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<a name="l00040"></a>00040 <span class="comment">// i.e. if set to n, allocation fails on the nth attempt. </span> |
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<a name="l00041"></a>00041 <span class="comment">// NB only used in debug mode</span> |
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<a name="l00042"></a>00042 <span class="preprocessor">#ifdef _DEBUG</span> |
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<a name="l00043"></a>00043 <span class="preprocessor"></span>LOCAL_D TInt allocFailNumber = 1; |
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<a name="l00044"></a>00044 <span class="preprocessor">#endif</span> |
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<a name="l00045"></a>00045 <span class="preprocessor"></span> |
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<a name="l00046"></a>00046 <span class="comment">// Function prototypes</span> |
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<a name="l00047"></a>00047 LOCAL_C TInt doExample(); |
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<a name="l00048"></a>00048 LOCAL_C <span class="keywordtype">void</span> callExampleL(); |
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<a name="l00049"></a>00049 |
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<a name="l00050"></a>00050 |
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<a name="l00051"></a>00051 |
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<a name="l00053"></a>00053 <span class="comment">//</span> |
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<a name="l00054"></a>00054 <span class="comment">// -----> CExample (definition)</span> |
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<a name="l00055"></a>00055 <span class="comment">//</span> |
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<a name="l00056"></a>00056 <span class="comment">// The class is used by the example code</span> |
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<a name="l00057"></a>00057 <span class="comment">//</span> |
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<a name="l00059"></a>00059 <span class="comment"></span><span class="keyword">class </span>CExample : <span class="keyword">public</span> CBase |
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<a name="l00060"></a>00060 { |
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<a name="l00061"></a>00061 <span class="keyword">public</span> : |
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<a name="l00062"></a>00062 <span class="keywordtype">void</span> DoSomethingL(); |
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<a name="l00063"></a>00063 <span class="keyword">public</span> : |
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<a name="l00064"></a>00064 TInt iInt; |
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<a name="l00065"></a>00065 }; |
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<a name="l00066"></a>00066 |
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<a name="l00067"></a>00067 |
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<a name="l00069"></a>00069 <span class="comment">//</span> |
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<a name="l00070"></a>00070 <span class="comment">// -----> CExample (implementation)</span> |
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<a name="l00071"></a>00071 <span class="comment">//</span> |
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<a name="l00073"></a>00073 <span class="comment"></span><span class="keywordtype">void</span> CExample::DoSomethingL() |
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<a name="l00074"></a>00074 { |
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<a name="l00075"></a>00075 <span class="comment">// Leave if the global flag is set</span> |
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<a name="l00076"></a>00076 <span class="keywordflow">if</span> (leaveFlag) |
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<a name="l00077"></a>00077 { |
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<a name="l00078"></a>00078 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgLeaving,<span class="stringliteral">"DoSomethingL leaving.\n"</span>); |
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<a name="l00079"></a>00079 console->Printf(KMsgLeaving); |
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<a name="l00080"></a>00080 User::Leave(KErrGeneral); |
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<a name="l00081"></a>00081 } |
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<a name="l00082"></a>00082 console->Printf(KCommonFormat1,iInt); |
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<a name="l00083"></a>00083 } |
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<a name="l00084"></a>00084 |
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<a name="l00086"></a>00086 <span class="comment">//</span> |
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<a name="l00087"></a>00087 <span class="comment">// Main function called by E32</span> |
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<a name="l00088"></a>00088 <span class="comment">//</span> |
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<a name="l00090"></a>00090 <span class="comment"></span>GLDEF_C TInt E32Main() |
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<a name="l00091"></a>00091 { |
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<a name="l00092"></a>00092 <span class="comment">// Get cleanup stack</span> |
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<a name="l00093"></a>00093 CTrapCleanup* cleanup=CTrapCleanup::New(); |
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98 |
<a name="l00094"></a>00094 |
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99 |
<a name="l00095"></a>00095 <span class="comment">// Some more initialization, then do the example</span> |
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100 |
<a name="l00096"></a>00096 TRAPD(error,callExampleL()); |
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101 |
<a name="l00097"></a>00097 |
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102 |
<a name="l00098"></a>00098 <span class="comment">// callExampleL() should never leave.</span> |
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103 |
<a name="l00099"></a>00099 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgPanicEpoc32ex,<span class="stringliteral">"EPOC32EX"</span>); |
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104 |
<a name="l00100"></a>00100 __ASSERT_ALWAYS(!error,User::Panic(KMsgPanicEpoc32ex,error)); |
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105 |
<a name="l00101"></a>00101 |
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106 |
<a name="l00102"></a>00102 <span class="comment">// destroy the cleanup stack</span> |
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107 |
<a name="l00103"></a>00103 <span class="keyword">delete</span> cleanup; |
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108 |
<a name="l00104"></a>00104 |
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109 |
<a name="l00105"></a>00105 <span class="comment">// return</span> |
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110 |
<a name="l00106"></a>00106 <span class="keywordflow">return</span> 0; |
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111 |
<a name="l00107"></a>00107 } |
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112 |
<a name="l00108"></a>00108 |
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113 |
<a name="l00109"></a>00109 |
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114 |
<a name="l00111"></a>00111 <span class="comment">//</span> |
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115 |
<a name="l00112"></a>00112 <span class="comment">//</span> |
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116 |
<a name="l00113"></a>00113 <span class="comment">//</span> |
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117 |
<a name="l00115"></a>00115 <span class="comment"></span>LOCAL_C <span class="keywordtype">void</span> callExampleL() |
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118 |
<a name="l00116"></a>00116 { |
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119 |
<a name="l00117"></a>00117 <span class="comment">// Initialize and call the example code under cleanup stack</span> |
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120 |
<a name="l00118"></a>00118 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgExampleCode,<span class="stringliteral">"Symbian platform Example Code"</span>); |
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121 |
<a name="l00119"></a>00119 console = Console::NewL(KMsgExampleCode,TSize(KConsFullScreen,KConsFullScreen)); |
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122 |
<a name="l00120"></a>00120 <span class="comment">// Put console onto the cleanup stack</span> |
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123 |
<a name="l00121"></a>00121 CleanupStack::PushL(console); |
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124 |
<a name="l00122"></a>00122 |
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125 |
<a name="l00123"></a>00123 <span class="comment">// Perform the example function</span> |
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126 |
<a name="l00124"></a>00124 TInt retVal; |
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127 |
<a name="l00125"></a>00125 retVal = doExample(); |
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128 |
<a name="l00126"></a>00126 |
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129 |
<a name="l00127"></a>00127 <span class="comment">// Show the value returned from the example</span> |
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130 |
<a name="l00128"></a>00128 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat2,<span class="stringliteral">"Return code=%d.\n"</span>); |
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131 |
<a name="l00129"></a>00129 console->Printf(KFormat2, retVal); |
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132 |
<a name="l00130"></a>00130 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgPressAnyKey,<span class="stringliteral">" [press any key]"</span>); |
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133 |
<a name="l00131"></a>00131 console->Printf(KMsgPressAnyKey); |
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134 |
<a name="l00132"></a>00132 console->Getch(); |
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135 |
<a name="l00133"></a>00133 |
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136 |
<a name="l00134"></a>00134 <span class="comment">// Remove the console object from the cleanupstack</span> |
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137 |
<a name="l00135"></a>00135 <span class="comment">// and destroy it </span> |
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138 |
<a name="l00136"></a>00136 CleanupStack::PopAndDestroy(); |
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139 |
<a name="l00137"></a>00137 } |
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140 |
<a name="l00138"></a>00138 |
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141 |
<a name="l00139"></a>00139 |
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142 |
<a name="l00141"></a>00141 <span class="comment">//</span> |
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143 |
<a name="l00142"></a>00142 <span class="comment">// Do the example</span> |
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144 |
<a name="l00143"></a>00143 <span class="comment">//</span> |
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145 |
<a name="l00145"></a>00145 <span class="comment"></span>TInt doExample() |
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146 |
<a name="l00146"></a>00146 { |
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147 |
<a name="l00147"></a>00147 <span class="comment">// Memory alloc fails on the 'allocFailNumber' attempt.</span> |
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148 |
<a name="l00148"></a>00148 __UHEAP_SETFAIL(RHeap::EDeterministic,allocFailNumber); |
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149 |
<a name="l00149"></a>00149 <span class="comment">// Allocate and test</span> |
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150 |
<a name="l00150"></a>00150 CExample* myExample = <span class="keyword">new</span> CExample; |
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151 |
<a name="l00151"></a>00151 <span class="keywordflow">if</span> (!myExample) <span class="keywordflow">return</span>(KErrNoMemory); |
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152 |
<a name="l00152"></a>00152 <span class="comment">// Do something with the CExample object</span> |
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153 |
<a name="l00153"></a>00153 myExample->iInt = 5; |
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154 |
<a name="l00154"></a>00154 <span class="comment">//</span> |
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155 |
<a name="l00155"></a>00155 console->Printf(KCommonFormat1,myExample->iInt); |
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156 |
<a name="l00156"></a>00156 <span class="comment">// Delete the CExample object</span> |
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157 |
<a name="l00157"></a>00157 <span class="keyword">delete</span> myExample; |
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158 |
<a name="l00158"></a>00158 <span class="comment">// Completed OK</span> |
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159 |
<a name="l00159"></a>00159 <span class="keywordflow">return</span> KErrNone; |
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160 |
<a name="l00160"></a>00160 } |
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161 |
<a name="l00161"></a>00161 |
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162 |
<a name="l00162"></a>00162 |
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163 |
<a name="l00163"></a>00163 |
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164 |
<a name="l00164"></a>00164 |
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165 |
<a name="l00165"></a>00165 |
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166 |
<a name="l00166"></a>00166 |
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167 |
<a name="l00167"></a>00167 |
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168 |
<a name="l00168"></a>00168 |
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169 |
</pre></div></div> |
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170 |
<hr size="1"/><address style="text-align: right;"><small>Generated by |
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171 |
<a href="http://www.doxygen.org/index.html"> |
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172 |
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address> |
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173 |
</body> |
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174 |
</html> |