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8 <h1>examples/Base/IPC/Async/Fibonacci1/Fibonacci1.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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9 <a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span> |
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10 <a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span> |
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11 <a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span> |
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12 <a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span> |
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13 <a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span> |
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14 <a name="l00007"></a>00007 <span class="comment">//</span> |
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15 <a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span> |
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16 <a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span> |
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17 <a name="l00010"></a>00010 <span class="comment">//</span> |
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18 <a name="l00011"></a>00011 <span class="comment">// Contributors:</span> |
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19 <a name="l00012"></a>00012 <span class="comment">//</span> |
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20 <a name="l00013"></a>00013 <span class="comment">// Description:</span> |
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21 <a name="l00014"></a>00014 <span class="comment">// Example wraps a console in an active object.</span> |
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22 <a name="l00015"></a>00015 <span class="comment">// Calculates Fibonacci number as chosen by the user. Note that, in this</span> |
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23 <a name="l00016"></a>00016 <span class="comment">// example, the calculation is done as part of the console active object's </span> |
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24 <a name="l00017"></a>00017 <span class="comment">// RunL() and can take a long time to complete. It also means that nothing</span> |
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25 <a name="l00018"></a>00018 <span class="comment">// else can happen (including responding to keyboard events) until the </span> |
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26 <a name="l00019"></a>00019 <span class="comment">// calculation is complete. </span> |
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27 <a name="l00020"></a>00020 <span class="comment">//</span> |
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28 <a name="l00021"></a>00021 |
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29 <a name="l00022"></a>00022 |
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30 <a name="l00023"></a>00023 |
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31 <a name="l00024"></a>00024 <span class="preprocessor">#include <e32base.h></span> |
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32 <a name="l00025"></a>00025 <span class="preprocessor">#include <e32cons.h></span> |
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33 <a name="l00026"></a>00026 <span class="preprocessor">#include <e32std.h></span> |
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34 <a name="l00027"></a>00027 |
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35 <a name="l00028"></a>00028 |
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36 <a name="l00029"></a>00029 LOCAL_D CConsoleBase* <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>; |
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37 <a name="l00030"></a>00030 |
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38 <a name="l00031"></a>00031 _LIT(KTxtMainInstructions,<span class="stringliteral">"\n\nPress 'F' to start\n 'ESC' to exit.\n"</span>); |
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39 <a name="l00032"></a>00032 |
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40 <a name="l00034"></a>00034 <span class="comment">//</span> |
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41 <a name="l00035"></a>00035 <span class="comment">// -----> CActiveConsole (definition)</span> |
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42 <a name="l00036"></a>00036 <span class="comment">//</span> |
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43 <a name="l00037"></a>00037 <span class="comment">// An abstract class which provides the facility to issue key requests. </span> |
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44 <a name="l00038"></a>00038 <span class="comment">//</span> |
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45 <a name="l00040"></a>00040 <span class="comment"></span> |
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46 <a name="l00041"></a>00041 <span class="keyword">class </span>CActiveConsole : <span class="keyword">public</span> CActive |
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47 <a name="l00042"></a>00042 { |
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48 <a name="l00043"></a>00043 <span class="keyword">public</span>: |
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49 <a name="l00044"></a>00044 <span class="comment">// Construction</span> |
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50 <a name="l00045"></a>00045 CActiveConsole(CConsoleBase* aConsole); |
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51 <a name="l00046"></a>00046 <span class="keywordtype">void</span> ConstructL(); |
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52 <a name="l00047"></a>00047 |
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53 <a name="l00048"></a>00048 <span class="comment">// Destruction</span> |
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54 <a name="l00049"></a>00049 ~CActiveConsole(); |
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55 <a name="l00050"></a>00050 |
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56 <a name="l00051"></a>00051 <span class="comment">// Issue request</span> |
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57 <a name="l00052"></a>00052 <span class="keywordtype">void</span> RequestCharacter(); |
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58 <a name="l00053"></a>00053 |
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59 <a name="l00054"></a>00054 <span class="comment">// Cancel request.</span> |
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60 <a name="l00055"></a>00055 <span class="comment">// Defined as pure virtual by CActive;</span> |
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61 <a name="l00056"></a>00056 <span class="comment">// implementation provided by this class.</span> |
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62 <a name="l00057"></a>00057 <span class="keywordtype">void</span> DoCancel(); |
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63 <a name="l00058"></a>00058 |
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64 <a name="l00059"></a>00059 <span class="comment">// Service completed request.</span> |
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65 <a name="l00060"></a>00060 <span class="comment">// Defined as pure virtual by CActive;</span> |
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66 <a name="l00061"></a>00061 <span class="comment">// implementation provided by this class,</span> |
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67 <a name="l00062"></a>00062 <span class="keywordtype">void</span> RunL(); |
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68 <a name="l00063"></a>00063 |
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69 <a name="l00064"></a>00064 <span class="comment">// Called from RunL() - an implementation must be provided</span> |
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70 <a name="l00065"></a>00065 <span class="comment">// by derived classes to handle the completed request</span> |
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71 <a name="l00066"></a>00066 <span class="keyword">virtual</span> <span class="keywordtype">void</span> ProcessKeyPress(TChar aChar) = 0; |
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72 <a name="l00067"></a>00067 |
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73 <a name="l00068"></a>00068 <span class="keyword">protected</span>: |
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74 <a name="l00069"></a>00069 <span class="comment">// Data members defined by this class</span> |
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75 <a name="l00070"></a>00070 CConsoleBase* iConsole; <span class="comment">// A console for reading from</span> |
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76 <a name="l00071"></a>00071 }; |
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77 <a name="l00072"></a>00072 |
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78 <a name="l00073"></a>00073 |
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79 <a name="l00075"></a>00075 <span class="comment">//</span> |
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80 <a name="l00076"></a>00076 <span class="comment">// -----> CExampleScheduler (definition)</span> |
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81 <a name="l00077"></a>00077 <span class="comment">//</span> |
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82 <a name="l00079"></a>00079 <span class="comment"></span> |
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83 <a name="l00080"></a>00080 <span class="keyword">class </span>CExampleScheduler : <span class="keyword">public</span> CActiveScheduler |
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84 <a name="l00081"></a>00081 { |
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85 <a name="l00082"></a>00082 <span class="keyword">public</span>: |
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86 <a name="l00083"></a>00083 <span class="keywordtype">void</span> Error (TInt aError) <span class="keyword">const</span>; |
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87 <a name="l00084"></a>00084 <span class="keywordtype">void</span> WaitForAnyRequest(); |
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88 <a name="l00085"></a>00085 <span class="keywordtype">void</span> SetActiveObject(CActiveConsole* aActiveConsole); |
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89 <a name="l00086"></a>00086 <span class="keyword">private</span>: |
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90 <a name="l00087"></a>00087 <span class="comment">// data members defined for this class</span> |
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91 <a name="l00088"></a>00088 CActiveConsole* iActiveConsole; |
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92 <a name="l00089"></a>00089 }; |
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93 <a name="l00090"></a>00090 |
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94 <a name="l00091"></a>00091 |
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95 <a name="l00093"></a>00093 <span class="comment">//</span> |
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96 <a name="l00094"></a>00094 <span class="comment">// -----> TFibonacciEngine (definition)</span> |
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97 <a name="l00095"></a>00095 <span class="comment">//</span> |
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98 <a name="l00096"></a>00096 <span class="comment">// This class provides the fibonacci calculation engine</span> |
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99 <a name="l00097"></a>00097 <span class="comment">//</span> |
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100 <a name="l00099"></a>00099 <span class="comment"></span> |
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101 <a name="l00100"></a>00100 <span class="keyword">class </span>TFibonacciEngine |
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102 <a name="l00101"></a>00101 { |
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103 <a name="l00102"></a>00102 <span class="keyword">public</span>: |
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104 <a name="l00103"></a>00103 <span class="keywordtype">void</span> Calculate (TInt aTerms) ; |
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105 <a name="l00104"></a>00104 |
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106 <a name="l00105"></a>00105 TInt iResult ; |
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107 <a name="l00106"></a>00106 } ; |
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108 <a name="l00107"></a>00107 |
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109 <a name="l00108"></a>00108 |
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110 <a name="l00110"></a>00110 <span class="comment">//</span> |
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111 <a name="l00111"></a>00111 <span class="comment">// -----> CFibonacciApplication (definition)</span> |
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112 <a name="l00112"></a>00112 <span class="comment">//</span> |
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113 <a name="l00113"></a>00113 <span class="comment">// This class encapsulates the fibonacci calculation engine</span> |
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114 <a name="l00114"></a>00114 <span class="comment">//</span> |
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115 <a name="l00116"></a>00116 <span class="comment"></span> |
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116 <a name="l00117"></a>00117 <span class="keyword">class </span>CFibonacciApplication : <span class="keyword">public</span> CActiveConsole |
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117 <a name="l00118"></a>00118 { |
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118 <a name="l00119"></a>00119 <span class="keyword">public</span>: |
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119 <a name="l00120"></a>00120 CFibonacciApplication(CConsoleBase* aConsole) ; |
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120 <a name="l00121"></a>00121 <span class="keywordtype">void</span> ConstructL(); |
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121 <a name="l00122"></a>00122 |
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122 <a name="l00123"></a>00123 <span class="comment">// Static construction</span> |
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123 <a name="l00124"></a>00124 <span class="keyword">static</span> CFibonacciApplication* NewLC(CConsoleBase* aConsole) ; |
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124 <a name="l00125"></a>00125 |
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125 <a name="l00126"></a>00126 <span class="comment">// service request</span> |
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126 <a name="l00127"></a>00127 <span class="keywordtype">void</span> ProcessKeyPress(TChar aChar) ; |
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127 <a name="l00128"></a>00128 |
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128 <a name="l00129"></a>00129 <span class="keyword">private</span>: |
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129 <a name="l00130"></a>00130 CConsoleBase* iConsole ; |
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130 <a name="l00131"></a>00131 TFibonacciEngine iFibonacciEngine ; |
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131 <a name="l00132"></a>00132 }; |
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132 <a name="l00133"></a>00133 |
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133 <a name="l00134"></a>00134 |
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134 <a name="l00136"></a>00136 <span class="comment">//</span> |
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135 <a name="l00137"></a>00137 <span class="comment">// -----> CActiveConsole (implementation)</span> |
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136 <a name="l00138"></a>00138 <span class="comment">//</span> |
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137 <a name="l00140"></a>00140 <span class="comment"></span> |
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138 <a name="l00141"></a>00141 CActiveConsole::CActiveConsole( CConsoleBase* aConsole) |
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139 <a name="l00142"></a>00142 : CActive(CActive::EPriorityUserInput) |
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140 <a name="l00143"></a>00143 <span class="comment">// Construct high-priority active object</span> |
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141 <a name="l00144"></a>00144 { |
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142 <a name="l00145"></a>00145 iConsole = aConsole; |
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143 <a name="l00146"></a>00146 __DECLARE_NAME(_S(<span class="stringliteral">"CActiveConsole"</span>)); |
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144 <a name="l00147"></a>00147 |
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145 <a name="l00148"></a>00148 } |
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146 <a name="l00149"></a>00149 |
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147 <a name="l00150"></a>00150 <span class="keywordtype">void</span> CActiveConsole::ConstructL() |
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148 <a name="l00151"></a>00151 { |
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149 <a name="l00152"></a>00152 <span class="comment">// Add to active scheduler</span> |
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150 <a name="l00153"></a>00153 CActiveScheduler::Add(<span class="keyword">this</span>); |
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151 <a name="l00154"></a>00154 } |
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152 <a name="l00155"></a>00155 |
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153 <a name="l00156"></a>00156 CActiveConsole::~CActiveConsole() |
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154 <a name="l00157"></a>00157 { |
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155 <a name="l00158"></a>00158 <span class="comment">// Make sure we're cancelled</span> |
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156 <a name="l00159"></a>00159 Cancel(); |
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157 <a name="l00160"></a>00160 } |
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158 <a name="l00161"></a>00161 |
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159 <a name="l00162"></a>00162 <span class="keywordtype">void</span> CActiveConsole::DoCancel() |
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160 <a name="l00163"></a>00163 { |
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161 <a name="l00164"></a>00164 iConsole->ReadCancel(); |
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162 <a name="l00165"></a>00165 } |
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163 <a name="l00166"></a>00166 |
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164 <a name="l00167"></a>00167 <span class="keywordtype">void</span> CActiveConsole::RunL() |
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165 <a name="l00168"></a>00168 { |
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166 <a name="l00169"></a>00169 <span class="comment">// Handle completed request</span> |
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167 <a name="l00170"></a>00170 ProcessKeyPress(TChar(iConsole->KeyCode())); |
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168 <a name="l00171"></a>00171 } |
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169 <a name="l00172"></a>00172 |
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170 <a name="l00173"></a>00173 <span class="keywordtype">void</span> CActiveConsole::RequestCharacter() |
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171 <a name="l00174"></a>00174 { |
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172 <a name="l00175"></a>00175 <span class="comment">// A request is issued to the CConsoleBase to accept a</span> |
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173 <a name="l00176"></a>00176 <span class="comment">// character from the keyboard.</span> |
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174 <a name="l00177"></a>00177 iConsole->Read(iStatus); |
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175 <a name="l00178"></a>00178 SetActive(); |
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176 <a name="l00179"></a>00179 } |
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177 <a name="l00180"></a>00180 |
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178 <a name="l00181"></a>00181 |
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179 <a name="l00183"></a>00183 <span class="comment">//</span> |
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180 <a name="l00184"></a>00184 <span class="comment">// -----> CExampleScheduler (implementation)</span> |
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181 <a name="l00185"></a>00185 <span class="comment">//</span> |
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182 <a name="l00187"></a>00187 <span class="comment"></span> |
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183 <a name="l00188"></a>00188 <span class="keywordtype">void</span> CExampleScheduler::Error(TInt aError)<span class="keyword"> const</span> |
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184 <a name="l00189"></a>00189 <span class="keyword"> </span>{ |
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185 <a name="l00190"></a>00190 _LIT(KTxtSchedulerError,<span class="stringliteral">"CExampleScheduler - error"</span>); |
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186 <a name="l00191"></a>00191 User::Panic(KTxtSchedulerError,aError); |
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187 <a name="l00192"></a>00192 } |
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188 <a name="l00193"></a>00193 |
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189 <a name="l00194"></a>00194 <span class="keywordtype">void</span> CExampleScheduler::WaitForAnyRequest() |
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190 <a name="l00195"></a>00195 { |
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191 <a name="l00196"></a>00196 <span class="keywordflow">if</span> (!(iActiveConsole->IsActive())) |
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192 <a name="l00197"></a>00197 iActiveConsole->RequestCharacter(); |
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193 <a name="l00198"></a>00198 CActiveScheduler::WaitForAnyRequest(); |
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194 <a name="l00199"></a>00199 } |
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195 <a name="l00200"></a>00200 |
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196 <a name="l00201"></a>00201 <span class="keywordtype">void</span> CExampleScheduler::SetActiveObject(CActiveConsole* aActiveConsole) |
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197 <a name="l00202"></a>00202 { |
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198 <a name="l00203"></a>00203 iActiveConsole = aActiveConsole; |
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199 <a name="l00204"></a>00204 } |
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200 <a name="l00205"></a>00205 |
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201 <a name="l00206"></a>00206 |
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202 <a name="l00208"></a>00208 <span class="comment">// CFibonacciApplication support routine</span> |
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203 <a name="l00209"></a>00209 <span class="comment">// uses up arrow & down arrow to change number, Enter to select</span> |
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204 <a name="l00211"></a>00211 <span class="comment"></span> |
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205 <a name="l00212"></a>00212 TInt GetValueFromKeyboard (TInt aInitial, TInt aStep, TInt lowerLimit, TInt upperLimit, <span class="keyword">const</span> TDesC& aPrompt, CConsoleBase* aConsole) |
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206 <a name="l00213"></a>00213 { |
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207 <a name="l00214"></a>00214 TChar input ; |
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208 <a name="l00215"></a>00215 TInt value = aInitial ; |
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209 <a name="l00216"></a>00216 |
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210 <a name="l00217"></a>00217 aConsole->Printf(aPrompt) ; |
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211 <a name="l00218"></a>00218 <span class="keywordflow">do</span> |
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212 <a name="l00219"></a>00219 { |
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213 <a name="l00220"></a>00220 aConsole->SetPos(0); |
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214 <a name="l00221"></a>00221 _LIT(KFormat1,<span class="stringliteral">"%d "</span>); |
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215 <a name="l00222"></a>00222 aConsole->Printf(KFormat1, value); |
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216 <a name="l00223"></a>00223 input = aConsole->Getch() ; |
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217 <a name="l00224"></a>00224 <span class="keywordflow">if</span> (input == EKeyUpArrow && value < upperLimit) value = value + aStep ; |
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218 <a name="l00225"></a>00225 <span class="keywordflow">if</span> (input == EKeyDownArrow && value > lowerLimit) value = value - aStep ; |
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219 <a name="l00226"></a>00226 <span class="keywordflow">if</span> (input == <span class="charliteral">'c'</span>) value = -1; |
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220 <a name="l00227"></a>00227 } |
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221 <a name="l00228"></a>00228 <span class="keywordflow">while</span> (input != EKeyEnter && input != <span class="charliteral">'c'</span>) ; |
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222 <a name="l00229"></a>00229 |
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223 <a name="l00230"></a>00230 <span class="keywordflow">return</span> value ; |
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224 <a name="l00231"></a>00231 } |
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225 <a name="l00232"></a>00232 |
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226 <a name="l00233"></a>00233 |
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227 <a name="l00235"></a>00235 <span class="comment">//</span> |
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228 <a name="l00236"></a>00236 <span class="comment">// -----> CFibonacciApplication (implementation)</span> |
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229 <a name="l00237"></a>00237 <span class="comment">//</span> |
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230 <a name="l00239"></a>00239 <span class="comment"></span> |
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231 <a name="l00240"></a>00240 CFibonacciApplication::CFibonacciApplication(CConsoleBase* aConsole ) |
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232 <a name="l00241"></a>00241 : CActiveConsole(aConsole) |
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233 <a name="l00242"></a>00242 <span class="comment">// construct zero-priority active object</span> |
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234 <a name="l00243"></a>00243 { |
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235 <a name="l00244"></a>00244 iConsole = aConsole ; |
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236 <a name="l00245"></a>00245 __DECLARE_NAME(_S(<span class="stringliteral">"CFibonacciApplication"</span>)); |
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237 <a name="l00246"></a>00246 } |
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238 <a name="l00247"></a>00247 |
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239 <a name="l00248"></a>00248 |
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240 <a name="l00249"></a>00249 CFibonacciApplication* CFibonacciApplication::NewLC(CConsoleBase* aConsole ) |
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241 <a name="l00250"></a>00250 { |
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242 <a name="l00251"></a>00251 CFibonacciApplication* <span class="keyword">self</span>=<span class="keyword">new</span> (ELeave) CFibonacciApplication(aConsole); |
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243 <a name="l00252"></a>00252 CleanupStack::PushL(<span class="keyword">self</span>); |
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244 <a name="l00253"></a>00253 <span class="keyword">self</span>->ConstructL(); |
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245 <a name="l00254"></a>00254 <span class="keywordflow">return</span> <span class="keyword">self</span>; |
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246 <a name="l00255"></a>00255 } |
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247 <a name="l00256"></a>00256 |
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248 <a name="l00257"></a>00257 |
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249 <a name="l00258"></a>00258 <span class="keywordtype">void</span> CFibonacciApplication::ConstructL() |
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250 <a name="l00259"></a>00259 { |
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251 <a name="l00260"></a>00260 <span class="comment">// Add to active scheduler</span> |
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252 <a name="l00261"></a>00261 CActiveScheduler::Add(<span class="keyword">this</span>); |
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253 <a name="l00262"></a>00262 <span class="comment">// Make this the active object</span> |
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254 <a name="l00263"></a>00263 ((CExampleScheduler*)(CActiveScheduler::Current()))->SetActiveObject(<span class="keyword">this</span>); |
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255 <a name="l00264"></a>00264 } |
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256 <a name="l00265"></a>00265 |
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257 <a name="l00266"></a>00266 |
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258 <a name="l00267"></a>00267 <span class="keywordtype">void</span> CFibonacciApplication::ProcessKeyPress(TChar aChar) |
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259 <a name="l00268"></a>00268 { |
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260 <a name="l00269"></a>00269 <span class="comment">// if key is ESC </span> |
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261 <a name="l00270"></a>00270 <span class="comment">// cancel any outstanding request</span> |
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262 <a name="l00271"></a>00271 <span class="comment">// stop the scheduler</span> |
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263 <a name="l00272"></a>00272 <span class="keywordflow">if</span> (aChar == EKeyEscape) |
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264 <a name="l00273"></a>00273 { |
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265 <a name="l00274"></a>00274 CActiveScheduler::Stop(); |
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266 <a name="l00275"></a>00275 <span class="keywordflow">return</span>; |
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267 <a name="l00276"></a>00276 } |
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268 <a name="l00277"></a>00277 |
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269 <a name="l00278"></a>00278 <span class="comment">// If key is "f" or "F"</span> |
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270 <a name="l00279"></a>00279 <span class="comment">// cancel any outstanding request</span> |
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271 <a name="l00280"></a>00280 <span class="comment">// issue a fibonacci request.</span> |
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272 <a name="l00281"></a>00281 <span class="keywordflow">if</span> (aChar == <span class="charliteral">'f'</span> || aChar == <span class="charliteral">'F'</span>) |
|
273 <a name="l00282"></a>00282 { |
|
274 <a name="l00283"></a>00283 _LIT(KTxtStartingFibonacci,<span class="stringliteral">"\nStarting Fibonacci.... \n"</span>); |
|
275 <a name="l00284"></a>00284 _LIT(KTxtReturnTermNumber,<span class="stringliteral">"\nENTER selects number, and starts calculation\nUP arrow increases num\nDOWN arrow decreases num\nC cancels\n\n"</span>); |
|
276 <a name="l00285"></a>00285 _LIT(KTxtCalculating,<span class="stringliteral">"\nCalculating...\n"</span>); |
|
277 <a name="l00286"></a>00286 _LIT(KFormat2,<span class="stringliteral">"\nResult : %u \n"</span>); |
|
278 <a name="l00287"></a>00287 _LIT(KTxtCancelled,<span class="stringliteral">"Cancelled"</span>); |
|
279 <a name="l00288"></a>00288 |
|
280 <a name="l00289"></a>00289 iConsole->Printf(KTxtStartingFibonacci); |
|
281 <a name="l00290"></a>00290 |
|
282 <a name="l00291"></a>00291 TInt iterations = GetValueFromKeyboard(5,1,2,46, KTxtReturnTermNumber, iConsole) ; |
|
283 <a name="l00292"></a>00292 <span class="keywordflow">if</span> (iterations == -1) <span class="comment">// convenient if awkward but allows us to indicate a request to cancel.</span> |
|
284 <a name="l00293"></a>00293 { |
|
285 <a name="l00294"></a>00294 iConsole->Printf(KTxtCancelled); |
|
286 <a name="l00295"></a>00295 iConsole->Printf(KTxtMainInstructions); |
|
287 <a name="l00296"></a>00296 <span class="keywordflow">return</span>; |
|
288 <a name="l00297"></a>00297 } |
|
289 <a name="l00298"></a>00298 |
|
290 <a name="l00299"></a>00299 iConsole->Printf(KTxtCalculating); |
|
291 <a name="l00300"></a>00300 iFibonacciEngine.Calculate(iterations); |
|
292 <a name="l00301"></a>00301 |
|
293 <a name="l00302"></a>00302 iConsole->Printf(KFormat2, iFibonacciEngine.iResult) ; |
|
294 <a name="l00303"></a>00303 iConsole->Printf(KTxtMainInstructions); |
|
295 <a name="l00304"></a>00304 <span class="keywordflow">return</span>; |
|
296 <a name="l00305"></a>00305 } |
|
297 <a name="l00306"></a>00306 |
|
298 <a name="l00307"></a>00307 <span class="comment">// any other key ignore</span> |
|
299 <a name="l00308"></a>00308 _LIT(KTxtNotRecognised,<span class="stringliteral">"\nUnwanted key pressed"</span>); |
|
300 <a name="l00309"></a>00309 iConsole->Printf(KTxtNotRecognised); |
|
301 <a name="l00310"></a>00310 iConsole->Printf(KTxtMainInstructions); |
|
302 <a name="l00311"></a>00311 } |
|
303 <a name="l00312"></a>00312 |
|
304 <a name="l00314"></a>00314 <span class="comment">//</span> |
|
305 <a name="l00315"></a>00315 <span class="comment">// -----> TFibonacciEngine (implementation)</span> |
|
306 <a name="l00316"></a>00316 <span class="comment">//</span> |
|
307 <a name="l00318"></a>00318 <span class="comment"></span> |
|
308 <a name="l00319"></a>00319 <span class="keywordtype">void</span> TFibonacciEngine::Calculate (TInt aTerms) |
|
309 <a name="l00320"></a>00320 { |
|
310 <a name="l00321"></a>00321 TInt iterations = aTerms ; |
|
311 <a name="l00322"></a>00322 |
|
312 <a name="l00323"></a>00323 TInt currentTotal = 1 ; |
|
313 <a name="l00324"></a>00324 TInt previousTotal = 0 ; |
|
314 <a name="l00325"></a>00325 _LIT(KTxtTooManyIterations,<span class="stringliteral">"Too many iterations"</span>); |
|
315 <a name="l00326"></a>00326 __ASSERT_ALWAYS(iterations<47,User::Panic(KTxtTooManyIterations,iterations)); |
|
316 <a name="l00327"></a>00327 |
|
317 <a name="l00328"></a>00328 <span class="comment">// if limit not yet reached</span> |
|
318 <a name="l00329"></a>00329 <span class="keywordflow">while</span> (iterations-- > 0) |
|
319 <a name="l00330"></a>00330 { |
|
320 <a name="l00331"></a>00331 <span class="comment">// calculate next number in series</span> |
|
321 <a name="l00332"></a>00332 TInt newTotal = currentTotal + previousTotal ; |
|
322 <a name="l00333"></a>00333 |
|
323 <a name="l00334"></a>00334 <span class="comment">// update variables</span> |
|
324 <a name="l00335"></a>00335 previousTotal = currentTotal ; |
|
325 <a name="l00336"></a>00336 currentTotal = newTotal ; |
|
326 <a name="l00337"></a>00337 |
|
327 <a name="l00338"></a>00338 <span class="comment">// introduce a delay</span> |
|
328 <a name="l00339"></a>00339 User::After(1000000) ; |
|
329 <a name="l00340"></a>00340 } |
|
330 <a name="l00341"></a>00341 |
|
331 <a name="l00342"></a>00342 iResult = currentTotal ; |
|
332 <a name="l00343"></a>00343 |
|
333 <a name="l00344"></a>00344 } |
|
334 <a name="l00345"></a>00345 |
|
335 <a name="l00346"></a>00346 |
|
336 <a name="l00348"></a>00348 <span class="comment">// This section deals with initialisation and ensuring we have a console active</span> |
|
337 <a name="l00350"></a>00350 <span class="comment"></span> |
|
338 <a name="l00351"></a>00351 <span class="keywordtype">void</span> doExampleL () ; |
|
339 <a name="l00352"></a>00352 |
|
340 <a name="l00353"></a>00353 <span class="keywordtype">void</span> SetupConsoleL(); |
|
341 <a name="l00354"></a>00354 |
|
342 <a name="l00355"></a>00355 GLDEF_C TInt <a class="code" href="dbllist_8cpp.html#0f358e9c4355138f629b8c4f37310295">E32Main</a>() <span class="comment">// main function called by E32</span> |
|
343 <a name="l00356"></a>00356 { |
|
344 <a name="l00357"></a>00357 CTrapCleanup* cleanup=CTrapCleanup::New(); <span class="comment">// get clean-up stack</span> |
|
345 <a name="l00358"></a>00358 TRAPD(<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>,SetupConsoleL()); <span class="comment">// more initialization, then do example</span> |
|
346 <a name="l00359"></a>00359 _LIT(KTxtFibonacciExampleError,<span class="stringliteral">"Fibonacci example error"</span>); |
|
347 <a name="l00360"></a>00360 __ASSERT_ALWAYS(!<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>,User::Panic(KTxtFibonacciExampleError,<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>)); |
|
348 <a name="l00361"></a>00361 <span class="keyword">delete</span> cleanup; <span class="comment">// destroy clean-up stack</span> |
|
349 <a name="l00362"></a>00362 <span class="keywordflow">return</span> 0; <span class="comment">// and return</span> |
|
350 <a name="l00363"></a>00363 } |
|
351 <a name="l00364"></a>00364 |
|
352 <a name="l00365"></a>00365 <span class="keywordtype">void</span> SetupConsoleL() <span class="comment">// initialize and call example code under cleanup stack</span> |
|
353 <a name="l00366"></a>00366 { |
|
354 <a name="l00367"></a>00367 _LIT(KTxtFibSingActObj,<span class="stringliteral">"Single Active Object"</span>); |
|
355 <a name="l00368"></a>00368 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>=Console::NewL(KTxtFibSingActObj, TSize(KConsFullScreen,KConsFullScreen)); |
|
356 <a name="l00369"></a>00369 CleanupStack::PushL(<a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>); |
|
357 <a name="l00370"></a>00370 |
|
358 <a name="l00371"></a>00371 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtMainInstructions) ; |
|
359 <a name="l00372"></a>00372 TRAPD(<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>, doExampleL()); <span class="comment">// perform example function</span> |
|
360 <a name="l00373"></a>00373 <span class="keywordflow">if</span> (<a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>) |
|
361 <a name="l00374"></a>00374 { |
|
362 <a name="l00375"></a>00375 _LIT(KFormat3,<span class="stringliteral">"failed: leave code=%d"</span>); |
|
363 <a name="l00376"></a>00376 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KFormat3, <a class="code" href="_camera___app_ui_8cpp.html#711e7d3cb49b7e0de7880fed269134d3">error</a>); |
|
364 <a name="l00377"></a>00377 } |
|
365 <a name="l00378"></a>00378 _LIT(KTxtPressAnyKey,<span class="stringliteral">"[Press any key to exit]"</span>); |
|
366 <a name="l00379"></a>00379 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtPressAnyKey); |
|
367 <a name="l00380"></a>00380 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Getch(); <span class="comment">// get and ignore character</span> |
|
368 <a name="l00381"></a>00381 CleanupStack::PopAndDestroy(); <span class="comment">// close console</span> |
|
369 <a name="l00382"></a>00382 } |
|
370 <a name="l00383"></a>00383 |
|
371 <a name="l00384"></a>00384 |
|
372 <a name="l00386"></a>00386 <span class="comment">//</span> |
|
373 <a name="l00387"></a>00387 <span class="comment">// Do the example</span> |
|
374 <a name="l00388"></a>00388 <span class="comment">//</span> |
|
375 <a name="l00390"></a>00390 <span class="comment"></span><span class="keywordtype">void</span> doExampleL() |
|
376 <a name="l00391"></a>00391 { |
|
377 <a name="l00392"></a>00392 <span class="comment">// Construct and install the active scheduler</span> |
|
378 <a name="l00393"></a>00393 CExampleScheduler* exampleScheduler = <span class="keyword">new</span> (ELeave) CExampleScheduler; |
|
379 <a name="l00394"></a>00394 |
|
380 <a name="l00395"></a>00395 <span class="comment">// Push onto the cleanup stack</span> |
|
381 <a name="l00396"></a>00396 CleanupStack::PushL(exampleScheduler); |
|
382 <a name="l00397"></a>00397 |
|
383 <a name="l00398"></a>00398 <span class="comment">// Install as the active scheduler</span> |
|
384 <a name="l00399"></a>00399 CActiveScheduler::Install(exampleScheduler); |
|
385 <a name="l00400"></a>00400 |
|
386 <a name="l00401"></a>00401 <span class="comment">// Create CFibonacciApplication active object.</span> |
|
387 <a name="l00402"></a>00402 CFibonacciApplication* fibonacci = CFibonacciApplication::NewLC(<a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>); |
|
388 <a name="l00403"></a>00403 |
|
389 <a name="l00404"></a>00404 <span class="comment">// issue initial request</span> |
|
390 <a name="l00405"></a>00405 fibonacci->RequestCharacter() ; |
|
391 <a name="l00406"></a>00406 |
|
392 <a name="l00407"></a>00407 <span class="comment">// Main part of the program:</span> |
|
393 <a name="l00408"></a>00408 <span class="comment">// wait loop that cycles until ActiveScheduler::Stop called</span> |
|
394 <a name="l00409"></a>00409 CActiveScheduler::Start(); |
|
395 <a name="l00410"></a>00410 |
|
396 <a name="l00411"></a>00411 <span class="comment">// Remove from the cleanup stack and destroy:</span> |
|
397 <a name="l00412"></a>00412 <span class="comment">// 1. the CFibonacciApplication active object.</span> |
|
398 <a name="l00413"></a>00413 <span class="comment">// 2. exampleScheduler</span> |
|
399 <a name="l00414"></a>00414 CleanupStack::PopAndDestroy(); |
|
400 <a name="l00415"></a>00415 CleanupStack::PopAndDestroy(); |
|
401 <a name="l00416"></a>00416 } |
|
402 <a name="l00417"></a>00417 |
|
403 </pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Thu Jan 21 10:32:56 2010 for TB10.1 Example Applications by |
|
404 <a href="http://www.doxygen.org/index.html"> |
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405 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.3 </small></address> |
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406 </body> |
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407 </html> |