Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_read_data_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/SysLibs/ResourceFiles/ReadData/ReadData.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>
<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">// This example shows how to load data from resource files</span>
<a name="l00015"></a>00015 <span class="comment">// into a class.</span>
<a name="l00016"></a>00016 <span class="comment">// It loads the resource identified as resource FIRST from the resource</span>
<a name="l00017"></a>00017 <span class="comment">// file. This is a simple resource of type DATA.</span>
<a name="l00018"></a>00018 <span class="comment">// The example constructs a CResData object to hold the </span>
<a name="l00019"></a>00019 <span class="comment">// individual items corresponding to the items in a </span>
<a name="l00020"></a>00020 <span class="comment">// DATA struct.</span>
<a name="l00021"></a>00021 <span class="comment">// The CResData object can also display the individual</span>
<a name="l00022"></a>00022 <span class="comment">// items at the test console. All WORD, BYTE and LONG</span>
<a name="l00023"></a>00023 <span class="comment">// are interpreted as signed values</span>
<a name="l00024"></a>00024 <span class="comment">//</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#include "CommonToResourceFilesEx.h"</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include "ReadData.h"</span>
<a name="l00031"></a>00031 <span class="preprocessor">#include <readdata.rsg></span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="comment">// Construct a new CResData object and place </span>
<a name="l00034"></a>00034 <span class="comment">// on the cleanup stack</span>
<a name="l00035"></a>00035 <a class="code" href="class_c_res_data.html">CResData</a>* CResData::NewLC(TResourceReader& aReader)
<a name="l00036"></a>00036 {
<a name="l00037"></a>00037 <a class="code" href="class_c_res_data.html">CResData</a>* <span class="keyword">self</span>=<span class="keyword">new</span> (ELeave) <a class="code" href="class_c_res_data.html">CResData</a>;
<a name="l00038"></a>00038 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00039"></a>00039 <span class="keyword">self</span>->ConstructL(aReader);
<a name="l00040"></a>00040 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00041"></a>00041 }
<a name="l00042"></a>00042
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="comment">// Complete the construction of the </span>
<a name="l00045"></a>00045 <span class="comment">// CResData object using the supplied</span>
<a name="l00046"></a>00046 <span class="comment">// reource reader representing the resource data.</span>
<a name="l00047"></a>00047 <span class="comment">// The structure of the data is assumed to be</span>
<a name="l00048"></a>00048 <span class="comment">// defined by the resource struct DATA in "ReadData.rh"</span>
<a name="l00049"></a>00049 <span class="keywordtype">void</span> CResData::ConstructL(TResourceReader& aReader)
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051 <span class="comment">// Interpret next bytes as a TInt16</span>
<a name="l00052"></a>00052 iWrd = aReader.ReadInt16();
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="comment">// Interpret next bytes as a TInt16</span>
<a name="l00055"></a>00055 iFlags = aReader.ReadInt16();
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="comment">// Interpret next bytes as a TInt32</span>
<a name="l00058"></a>00058 iLng = aReader.ReadInt32();
<a name="l00059"></a>00059
<a name="l00060"></a>00060 iTxt = aReader.ReadTPtrC();
<a name="l00061"></a>00061 <span class="comment">// Interpret the next byte as the length</span>
<a name="l00062"></a>00062 <span class="comment">// of text. The text itself follows</span>
<a name="l00063"></a>00063 <span class="comment">// this byte.</span>
<a name="l00064"></a>00064 iLtxt = aReader.ReadHBufC16L();
<a name="l00065"></a>00065 <span class="comment">// Interpret the next byte as a TInt8</span>
<a name="l00066"></a>00066 iByt = aReader.ReadInt8();
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="comment">// Interpret next bytes as a TReal</span>
<a name="l00069"></a>00069 iDbl = aReader.ReadReal64();
<a name="l00070"></a>00070
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="comment">// Destructor needs to ensure that </span>
<a name="l00075"></a>00075 <span class="comment">// the HBufC descriptor iLtxt is destroyed.</span>
<a name="l00076"></a>00076 CResData::~CResData()
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 <span class="keywordflow">if</span> (iLtxt)
<a name="l00079"></a>00079 <span class="keyword">delete</span> iLtxt;
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="comment">// Show the individual resource itens</span>
<a name="l00084"></a>00084 <span class="comment">// at the test console.</span>
<a name="l00085"></a>00085 <span class="keywordtype">void</span> CResData::ShowData(<span class="keyword">const</span> TInt aStructNum)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KResourceItems,<span class="stringliteral">"Resource items (struct #%d):\n"</span>);
<a name="l00088"></a>00088 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KResourceItems2,<span class="stringliteral">"Resource items:\n"</span>);
<a name="l00089"></a>00089 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KWrdFormat,<span class="stringliteral">"wrd = %d\n"</span>);
<a name="l00090"></a>00090 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFlags,<span class="stringliteral">"flags = "</span>);
<a name="l00091"></a>00091 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KEFlagItem,<span class="stringliteral">"EFlagItem"</span>);
<a name="l00092"></a>00092 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KNewline,<span class="stringliteral">"\n"</span>);
<a name="l00093"></a>00093 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KLngFormat,<span class="stringliteral">"lng = %d\n"</span>);
<a name="l00094"></a>00094 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KBytFormat,<span class="stringliteral">"byt = %d\n"</span>);
<a name="l00095"></a>00095 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDblFormat,<span class="stringliteral">"dbl = %S\n"</span>);
<a name="l00096"></a>00096 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat,<span class="stringliteral">"txt = %S\n"</span>);
<a name="l00097"></a>00097 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KLtxtFormat,<span class="stringliteral">"ltxt = %S\n"</span>);
<a name="l00098"></a>00098
<a name="l00099"></a>00099 TBuf<16> temp;
<a name="l00100"></a>00100 TRealFormat format(16,2);
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="keywordflow">if</span> (aStructNum)
<a name="l00103"></a>00103 console->Printf(KResourceItems,
<a name="l00104"></a>00104 aStructNum
<a name="l00105"></a>00105 );
<a name="l00106"></a>00106 <span class="keywordflow">else</span>
<a name="l00107"></a>00107 console->Printf(KResourceItems2);
<a name="l00108"></a>00108
<a name="l00109"></a>00109 <span class="comment">// * * * * * * * * *</span>
<a name="l00110"></a>00110 console->Printf(KWrdFormat,iWrd);
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">// * * * * * * * * *</span>
<a name="l00113"></a>00113 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KLtxt,<span class="stringliteral">"ltxt = \n"</span>);
<a name="l00114"></a>00114 console->Printf(KFlags);
<a name="l00115"></a>00115 TUint mask = 1;
<a name="l00116"></a>00116 TBuf<256> temp2;
<a name="l00117"></a>00117 <span class="keywordflow">for</span> (TInt ii = 0 ; ii < 16; ii++)
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119 <span class="keywordflow">if</span> (iFlags & mask)
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121 temp2.Append(KEFlagItem);
<a name="l00122"></a>00122 temp2.AppendNum(ii+1);
<a name="l00123"></a>00123 temp2.Append(<span class="charliteral">'+'</span>);
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 mask <<= 1;
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127 <span class="keywordflow">if</span> (temp2.Length())
<a name="l00128"></a>00128 temp2.SetLength(temp2.Length()-1);
<a name="l00129"></a>00129 console->Printf(temp2);
<a name="l00130"></a>00130 console->Printf(KNewline);
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="comment">// * * * * * * * * *</span>
<a name="l00133"></a>00133 console->Printf(KLngFormat,iLng);
<a name="l00134"></a>00134 <span class="comment">// * * * * * * * * *</span>
<a name="l00135"></a>00135 console->Printf(KTxtFormat,&iTxt);
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="comment">// * * * * * * * * * </span>
<a name="l00138"></a>00138 <span class="keywordflow">if</span> (iLtxt)
<a name="l00139"></a>00139 console->Printf(KLtxtFormat,iLtxt);
<a name="l00140"></a>00140 <span class="keywordflow">else</span>
<a name="l00141"></a>00141 console->Printf(KLtxt);
<a name="l00142"></a>00142 <span class="comment">// * * * * * * * * *</span>
<a name="l00143"></a>00143 console->Printf(KBytFormat,iByt);
<a name="l00144"></a>00144
<a name="l00145"></a>00145 <span class="comment">// * * * * * * * * *</span>
<a name="l00146"></a>00146 temp.Num(iDbl,format);
<a name="l00147"></a>00147 console->Printf(KDblFormat,&temp);
<a name="l00148"></a>00148
<a name="l00149"></a>00149 }
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="comment">// Do the example(s)</span>
<a name="l00154"></a>00154
<a name="l00155"></a>00155 LOCAL_C <span class="keywordtype">void</span> doExampleL()
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <span class="comment">// Declare a resource file</span>
<a name="l00158"></a>00158 RResourceFile resourceFile;
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="comment">// open resource file on the emulator(__WINS__ is defined for the Windows emulator)</span>
<a name="l00161"></a>00161 <span class="comment">//(leave if error)</span>
<a name="l00162"></a>00162 <span class="preprocessor"> #if defined(__WINS__)</span>
<a name="l00163"></a>00163 <span class="preprocessor"></span> <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KZSystemDataRsc,<span class="stringliteral">"Z:\\Resource\\Apps\\ReadData.rsc"</span>);
<a name="l00164"></a>00164 resourceFile.OpenL(fsSession, KZSystemDataRsc);
<a name="l00165"></a>00165 <span class="preprocessor"> #endif</span>
<a name="l00166"></a>00166 <span class="preprocessor"></span>
<a name="l00167"></a>00167 <span class="comment">// open a resource file on the target phone</span>
<a name="l00168"></a>00168 <span class="comment">// ( __EPOC32__ is defined for all target hardware platforms regardless of processor type/hardware architecture)</span>
<a name="l00169"></a>00169 <span class="preprocessor"> #if defined(__EPOC32__)</span>
<a name="l00170"></a>00170 <span class="preprocessor"></span> <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KCSystemDataRsc,<span class="stringliteral">"Z:\\Resource\\Apps\\ReadData.rsc"</span>);
<a name="l00171"></a>00171 resourceFile.OpenL(fsSession, KCSystemDataRsc);
<a name="l00172"></a>00172 <span class="preprocessor"> #endif</span>
<a name="l00173"></a>00173 <span class="preprocessor"></span>
<a name="l00174"></a>00174 <span class="comment">// Read the first resource & construct a resource reader</span>
<a name="l00175"></a>00175 HBufC8* res = resourceFile.AllocReadLC(FIRST);
<a name="l00176"></a>00176
<a name="l00177"></a>00177 TResourceReader theReader;
<a name="l00178"></a>00178 theReader.SetBuffer(res);
<a name="l00179"></a>00179
<a name="l00180"></a>00180 <span class="comment">// construct a CResData object to contain</span>
<a name="l00181"></a>00181 <span class="comment">// the simple resource of type DATA.</span>
<a name="l00182"></a>00182 <a class="code" href="class_c_res_data.html">CResData</a>* resData = CResData::NewLC(theReader);
<a name="l00183"></a>00183
<a name="l00184"></a>00184 <span class="comment">// Can now remove resData from the cleanup stack</span>
<a name="l00185"></a>00185 CleanupStack::Pop();
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="comment">// finished with res</span>
<a name="l00188"></a>00188 CleanupStack::PopAndDestroy();
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="comment">// display data</span>
<a name="l00191"></a>00191 resData->ShowData();
<a name="l00192"></a>00192
<a name="l00193"></a>00193 <span class="comment">// destroy the CResData </span>
<a name="l00194"></a>00194 <span class="keyword">delete</span> resData;
<a name="l00195"></a>00195
<a name="l00196"></a>00196 <span class="comment">// finished with resource file, so close it.</span>
<a name="l00197"></a>00197 resourceFile.Close();
<a name="l00198"></a>00198 }
<a name="l00199"></a>00199
<a name="l00200"></a>00200
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