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5 <title>TB9.2 Example Applications: examples/Base/IPC/pubsub/subscribepe.cpp Source File</title> |
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11 <h1>examples/Base/IPC/pubsub/subscribepe.cpp</h1><a href="subscribepe_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> |
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12 <a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span> |
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13 <a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span> |
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14 <a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span> |
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15 <a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span> |
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16 <a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span> |
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17 <a name="l00007"></a>00007 <span class="comment">//</span> |
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18 <a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span> |
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19 <a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span> |
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20 <a name="l00010"></a>00010 <span class="comment">//</span> |
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21 <a name="l00011"></a>00011 <span class="comment">// Contributors:</span> |
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22 <a name="l00012"></a>00012 <span class="comment">//</span> |
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23 <a name="l00013"></a>00013 <span class="comment">// Description:</span> |
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24 <a name="l00014"></a>00014 <span class="comment">// Demonstrates the pure event pattern of subscribing to an integer property</span> |
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25 <a name="l00015"></a>00015 <span class="comment">//</span> |
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26 <a name="l00016"></a>00016 |
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27 <a name="l00017"></a>00017 |
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28 <a name="l00018"></a>00018 |
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29 <a name="l00023"></a>00023 <span class="preprocessor">#include "<a class="code" href="subscribepe_8h.html">subscribepe.h</a>"</span> |
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30 <a name="l00024"></a>00024 |
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31 <a name="l00025"></a>00025 LOCAL_D CConsoleBase* console; |
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32 <a name="l00026"></a>00026 |
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33 <a name="l00030"></a>00030 CIntPropertyWatch::CIntPropertyWatch():CActive(EPriority) |
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34 <a name="l00031"></a>00031 { |
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35 <a name="l00032"></a>00032 } |
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36 <a name="l00033"></a>00033 |
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37 <a name="l00038"></a>00038 <span class="keywordtype">void</span> CIntPropertyWatch::ConstructL(CConsoleBase* aConsole) |
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38 <a name="l00039"></a>00039 { |
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39 <a name="l00040"></a>00040 User::LeaveIfError(iProperty.Attach(KMyPropertyCat,KMyPropertyName)); |
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40 <a name="l00041"></a>00041 iConsole = aConsole; |
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41 <a name="l00042"></a>00042 CActiveScheduler::Add(<span class="keyword">this</span>); |
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42 <a name="l00043"></a>00043 } |
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43 <a name="l00044"></a>00044 |
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44 <a name="l00050"></a><a class="code" href="class_c_int_property_watch.html#a1c80ac74f96112ac7da19fff62c8ee03">00050</a> <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>* <a class="code" href="class_c_int_property_watch.html#a1c80ac74f96112ac7da19fff62c8ee03">CIntPropertyWatch::NewL</a>(CConsoleBase* aConsole) |
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45 <a name="l00051"></a>00051 { |
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46 <a name="l00052"></a>00052 <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>; |
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47 <a name="l00053"></a>00053 CleanupStack::PushL(<span class="keyword">self</span>); |
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48 <a name="l00054"></a>00054 <span class="keyword">self</span>->ConstructL(aConsole); |
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49 <a name="l00055"></a>00055 CleanupStack::Pop(<span class="keyword">self</span>); |
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50 <a name="l00056"></a>00056 <span class="keywordflow">return</span> <span class="keyword">self</span>; |
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51 <a name="l00057"></a>00057 } |
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52 <a name="l00058"></a>00058 |
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53 <a name="l00062"></a>00062 CIntPropertyWatch::~CIntPropertyWatch() |
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54 <a name="l00063"></a>00063 { |
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55 <a name="l00064"></a>00064 iProperty.Close(); |
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56 <a name="l00065"></a>00065 Cancel(); |
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57 <a name="l00066"></a>00066 } |
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58 <a name="l00067"></a>00067 |
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59 <a name="l00071"></a>00071 <span class="keywordtype">void</span> CIntPropertyWatch::DoCancel() |
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60 <a name="l00072"></a>00072 { |
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61 <a name="l00073"></a>00073 iProperty.Cancel(); |
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62 <a name="l00074"></a>00074 } |
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63 <a name="l00075"></a>00075 |
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64 <a name="l00080"></a>00080 <span class="keywordtype">void</span> CIntPropertyWatch::RunL() |
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65 <a name="l00081"></a>00081 { |
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66 <a name="l00082"></a>00082 <span class="comment">// Receive a notification when a value is published</span> |
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67 <a name="l00083"></a>00083 <span class="comment">// The RProperty::Get() function call can be omitted as the published value is of no importance in the pure event pattern</span> |
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68 <a name="l00084"></a>00084 TInt value; |
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69 <a name="l00085"></a>00085 TInt err = iProperty.Get(value); |
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70 <a name="l00086"></a>00086 <span class="keywordflow">if</span> (err == KErrNotFound) |
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71 <a name="l00087"></a>00087 { |
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72 <a name="l00088"></a>00088 <span class="comment">// No need to re-subscribe to the property as it has been deleted by the publisher</span> |
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73 <a name="l00089"></a>00089 CActiveScheduler::Stop(); |
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74 <a name="l00090"></a>00090 } |
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75 <a name="l00091"></a>00091 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (err == KErrNone) |
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76 <a name="l00092"></a>00092 { |
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77 <a name="l00093"></a>00093 <span class="comment">// Print the value of the property</span> |
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78 <a name="l00094"></a>00094 PrintProperty(value); |
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79 <a name="l00095"></a>00095 <span class="comment">// Re-subscribe to the property</span> |
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80 <a name="l00096"></a>00096 <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">IssueRequest</a>(); |
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81 <a name="l00097"></a>00097 } |
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82 <a name="l00098"></a>00098 <span class="keywordflow">else</span> |
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83 <a name="l00099"></a>00099 { |
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84 <a name="l00100"></a>00100 <span class="comment">// Leave the function in case of any other error</span> |
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85 <a name="l00101"></a>00101 CActiveScheduler::Stop(); |
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86 <a name="l00102"></a>00102 User::Leave(err); |
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87 <a name="l00103"></a>00103 } |
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88 <a name="l00104"></a>00104 } |
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89 <a name="l00105"></a>00105 |
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90 <a name="l00110"></a>00110 <span class="keywordtype">void</span> CIntPropertyWatch::PrintProperty(TInt aValue) |
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91 <a name="l00111"></a>00111 { |
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92 <a name="l00112"></a>00112 iConsole->Printf(KTxtValChange,aValue); |
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93 <a name="l00113"></a>00113 } |
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94 <a name="l00114"></a>00114 |
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95 <a name="l00119"></a><a class="code" href="class_c_int_property_watch.html#a4d0ef36ddc6bd9c7fc0566656a442e10">00119</a> <span class="keywordtype">void</span> <a class="code" href="class_c_int_property_watch.html#a4d0ef36ddc6bd9c7fc0566656a442e10">CIntPropertyWatch::WatchL</a>() |
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96 <a name="l00120"></a>00120 { |
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97 <a name="l00121"></a>00121 TInt value; |
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98 <a name="l00122"></a>00122 <span class="comment">// Checks if the property exists</span> |
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99 <a name="l00123"></a>00123 TInt res = iProperty.Get(value); |
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100 <a name="l00124"></a>00124 <span class="keywordflow">if</span> (res == KErrNotFound) |
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101 <a name="l00125"></a>00125 { |
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102 <a name="l00126"></a>00126 <span class="comment">// Property not defined</span> |
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103 <a name="l00127"></a>00127 User::Leave(res); |
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104 <a name="l00128"></a>00128 } |
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105 <a name="l00129"></a>00129 <span class="comment">// Prints the value of the property</span> |
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106 <a name="l00130"></a>00130 <span class="comment">// This is only to illustrate that the value of the property is set by the publisher</span> |
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107 <a name="l00131"></a>00131 <span class="comment">// This value has no significance as the pure event distribution pattern of publish and subscribe is being followed</span> |
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108 <a name="l00132"></a>00132 PrintProperty(value); |
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109 <a name="l00133"></a>00133 <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">IssueRequest</a>(); |
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110 <a name="l00134"></a>00134 } |
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111 <a name="l00135"></a>00135 |
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112 <a name="l00139"></a><a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">00139</a> <span class="keywordtype">void</span> <a class="code" href="class_c_int_property_watch.html#a0bb923fa4b2d26e334fc4a647f486357">CIntPropertyWatch::IssueRequest</a>() |
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113 <a name="l00140"></a>00140 { |
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114 <a name="l00141"></a>00141 iProperty.Subscribe(iStatus); |
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115 <a name="l00142"></a>00142 SetActive(); |
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116 <a name="l00143"></a>00143 } |
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117 <a name="l00144"></a>00144 |
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118 <a name="l00145"></a>00145 <span class="keywordtype">void</span> DoExampleL() |
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119 <a name="l00146"></a>00146 { |
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120 <a name="l00147"></a>00147 CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler(); |
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121 <a name="l00148"></a>00148 CleanupStack::PushL(scheduler); |
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122 <a name="l00149"></a>00149 CActiveScheduler::Install(scheduler); |
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123 <a name="l00150"></a>00150 |
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124 <a name="l00151"></a>00151 console->Printf(KTxtPESub); |
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125 <a name="l00152"></a>00152 |
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126 <a name="l00153"></a>00153 <span class="comment">// Create the integer property watch active object</span> |
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127 <a name="l00154"></a>00154 <a class="code" href="class_c_int_property_watch.html">CIntPropertyWatch</a>* obj = <a class="code" href="class_c_int_property_watch.html#a1c80ac74f96112ac7da19fff62c8ee03">CIntPropertyWatch::NewL</a>(console); |
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128 <a name="l00155"></a>00155 CleanupStack::PushL(obj); |
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129 <a name="l00156"></a>00156 |
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130 <a name="l00157"></a>00157 <span class="comment">// Subscribe to the property and start the scheduler</span> |
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131 <a name="l00158"></a>00158 obj-><a class="code" href="class_c_int_property_watch.html#a4d0ef36ddc6bd9c7fc0566656a442e10">WatchL</a>(); |
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132 <a name="l00159"></a>00159 CActiveScheduler::Start(); |
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133 <a name="l00160"></a>00160 |
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134 <a name="l00161"></a>00161 CleanupStack::PopAndDestroy(obj); |
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135 <a name="l00162"></a>00162 CleanupStack::PopAndDestroy(scheduler); |
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136 <a name="l00163"></a>00163 } |
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137 <a name="l00164"></a>00164 |
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138 <a name="l00165"></a><a class="code" href="subscribepe_8cpp.html#a0f358e9c4355138f629b8c4f37310295">00165</a> GLDEF_C TInt E32Main() |
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139 <a name="l00166"></a>00166 { |
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140 <a name="l00167"></a>00167 __UHEAP_MARK; |
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141 <a name="l00168"></a>00168 CTrapCleanup* cleanup = CTrapCleanup::New(); |
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142 <a name="l00169"></a>00169 |
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143 <a name="l00170"></a>00170 TRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize(KConsFullScreen,KConsFullScreen))); |
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144 <a name="l00171"></a>00171 <span class="keywordflow">if</span> (createError) |
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145 <a name="l00172"></a>00172 <span class="keywordflow">return</span> createError; |
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146 <a name="l00173"></a>00173 |
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147 <a name="l00174"></a>00174 TRAPD(mainError, DoExampleL()); |
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148 <a name="l00175"></a>00175 <span class="keywordflow">if</span> (mainError) |
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149 <a name="l00176"></a>00176 console->Printf(KTextFailed, mainError); |
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150 <a name="l00177"></a>00177 console->Printf(KTextPressAnyKey); |
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151 <a name="l00178"></a>00178 console->Getch(); |
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152 <a name="l00179"></a>00179 |
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153 <a name="l00180"></a>00180 <span class="keyword">delete</span> console; |
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154 <a name="l00181"></a>00181 <span class="keyword">delete</span> cleanup; |
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155 <a name="l00182"></a>00182 __UHEAP_MARKEND; |
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156 <a name="l00183"></a>00183 <span class="keywordflow">return</span> KErrNone; |
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157 <a name="l00184"></a>00184 } |
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158 </pre></div></div> |
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