Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_stream_in_store_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/Stores/StreamInStore/StreamInStore.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">// Example to demonstrate stream creation in a non persistent store. </span>
<a name="l00015"></a>00015 <span class="comment">// The example:</span>
<a name="l00016"></a>00016 <span class="comment">// constructs two different types of object,</span>
<a name="l00017"></a>00017 <span class="comment">// writes them to a single stream contained in</span>
<a name="l00018"></a>00018 <span class="comment">// the in-memory store (a CBufStore),</span>
<a name="l00019"></a>00019 <span class="comment">// displays the contents of the objects,</span>
<a name="l00020"></a>00020 <span class="comment">// deletes them from memory,</span>
<a name="l00021"></a>00021 <span class="comment">// restores them from the store,</span>
<a name="l00022"></a>00022 <span class="comment">// displays the contents of the restored objects</span>
<a name="l00023"></a>00023 <span class="comment">//</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="preprocessor">#include "CommonStreamStore.h"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <s32file.h></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <s32mem.h></span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00032"></a>00032 <span class="comment">// Format types and the newline character</span>
<a name="l00033"></a>00033 <span class="comment">//</span>
<a name="l00034"></a>00034 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtNewLine,<span class="stringliteral">"\n"</span>);
<a name="l00035"></a>00035 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormatType1,<span class="stringliteral">"\n%S, "</span>);
<a name="l00036"></a>00036 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormatType2,<span class="stringliteral">"%d, "</span>);
<a name="l00037"></a>00037 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormatType3,<span class="stringliteral">"%u, "</span>);
<a name="l00038"></a>00038 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormatType4,<span class="stringliteral">"%u "</span>);
<a name="l00039"></a>00039 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormatType5,<span class="stringliteral">"%f "</span>);
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <span class="comment">// Constructs an object of type CClassA and an object</span>
<a name="l00042"></a>00042 <span class="comment">// of type CClassB, externalizes them to a</span>
<a name="l00043"></a>00043 <span class="comment">// non-persistent store and then destroys the</span>
<a name="l00044"></a>00044 <span class="comment">// CClassA object. </span>
<a name="l00045"></a>00045 <span class="keyword">static</span> <span class="keywordtype">void</span> doMakeAndStoreL(CStreamStore& aStore,TStreamId& anId);
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="comment">// Constructs "empty" CClassA and CClassB objects and</span>
<a name="l00048"></a>00048 <span class="comment">// restores them from the in-memory store.</span>
<a name="l00049"></a>00049 <span class="keyword">static</span> <span class="keywordtype">void</span> doRestoreL(CStreamStore& aStore,<span class="keyword">const</span> TStreamId& anId);
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="comment">// Displays the contents of a CClassA object</span>
<a name="l00052"></a>00052 <span class="keyword">class </span><a class="code" href="class_c_class_a.html">CClassA</a>;
<a name="l00053"></a>00053 <span class="keyword">static</span> <span class="keywordtype">void</span> doShow(<span class="keyword">const</span> TDesC& aHeading,<span class="keyword">const</span> <a class="code" href="class_c_class_a.html">CClassA</a>& anA);
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment">// Displays the contents of a CClassB object</span>
<a name="l00056"></a>00056 <span class="keyword">class </span>CClassB;
<a name="l00057"></a>00057 <span class="keyword">static</span> <span class="keywordtype">void</span> doShow(<span class="keyword">const</span> TDesC& aHeading,<span class="keyword">const</span> CClassB& aB);
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="comment">// definition of CClassA</span>
<a name="l00060"></a>00060 <span class="keyword">class </span><a class="code" href="class_c_class_a.html">CClassA</a> : <span class="keyword">public</span> CBase
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 <span class="keyword">public</span> :
<a name="l00063"></a>00063 <span class="keyword">static</span> <a class="code" href="class_c_class_a.html">CClassA</a>* NewLC();
<a name="l00064"></a>00064 ~<a class="code" href="class_c_class_a.html">CClassA</a>();
<a name="l00065"></a>00065 <span class="keywordtype">void</span> SetTextL(<span class="keyword">const</span> TDesC& aData);
<a name="l00066"></a>00066 <span class="keywordtype">void</span> ExternalizeL(RWriteStream& aStream) <span class="keyword">const</span>;
<a name="l00067"></a>00067 <span class="keywordtype">void</span> InternalizeL(RReadStream& aStream);
<a name="l00068"></a>00068 <span class="keyword">public</span> :
<a name="l00069"></a>00069 HBufC* iVarBuffer;
<a name="l00070"></a>00070 TInt iIntValue;
<a name="l00071"></a>00071 TUint iUintValue;
<a name="l00072"></a>00072 };
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="comment">// definition of CClassB</span>
<a name="l00075"></a>00075 <span class="keyword">class </span>CClassB : <span class="keyword">public</span> CBase
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 <span class="keyword">public</span> :
<a name="l00078"></a>00078 <span class="keyword">static</span> CClassB* NewLC();
<a name="l00079"></a>00079 <span class="keywordtype">void</span> ExternalizeL(RWriteStream& aStream) <span class="keyword">const</span>;
<a name="l00080"></a>00080 <span class="keywordtype">void</span> InternalizeL(RReadStream& aStream);
<a name="l00081"></a>00081 <span class="keyword">public</span> :
<a name="l00082"></a>00082 TBuf<32> iFixBuffer;
<a name="l00083"></a>00083 TUint iUintValue;
<a name="l00084"></a>00084 TInt iIntValue;
<a name="l00085"></a>00085 TReal iRealValue;
<a name="l00086"></a>00086 };
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="comment">// Do the example</span>
<a name="l00089"></a>00089 <span class="keyword">static</span> <span class="keywordtype">void</span> doExampleL()
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091 <span class="comment">// The stream id, kept in memory and used</span>
<a name="l00092"></a>00092 <span class="comment">// to access the (one and only stream) in the</span>
<a name="l00093"></a>00093 <span class="comment">// non-persistent store</span>
<a name="l00094"></a>00094 TStreamId theId;
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">// construct a CBufStore, an in-memory </span>
<a name="l00097"></a>00097 <span class="comment">// non-persistent store.</span>
<a name="l00098"></a>00098 CStreamStore* store = CBufStore::NewLC(2 <span class="comment">/*granularity*/</span>);
<a name="l00099"></a>00099
<a name="l00100"></a>00100 doMakeAndStoreL(*store,theId);
<a name="l00101"></a>00101 doRestoreL(*store,theId);
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="comment">// destroy the CBufStore object</span>
<a name="l00104"></a>00104 CleanupStack::PopAndDestroy();
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="keyword">static</span> <span class="keywordtype">void</span> doMakeAndStoreL(CStreamStore& aStore,TStreamId& anId)
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109 <span class="comment">// Construct an object of type CClassA and put some </span>
<a name="l00110"></a>00110 <span class="comment">// data into it</span>
<a name="l00111"></a>00111 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtForClassA,<span class="stringliteral">"Text for CClassA"</span>);
<a name="l00112"></a>00112 <a class="code" href="class_c_class_a.html">CClassA</a>* theA = CClassA::NewLC();
<a name="l00113"></a>00113 theA->SetTextL(KTxtForClassA);
<a name="l00114"></a>00114 theA->iIntValue = -1;
<a name="l00115"></a>00115 theA->iUintValue = 2;
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="comment">// Construct an object of type CClassB and put some </span>
<a name="l00118"></a>00118 <span class="comment">// data into it</span>
<a name="l00119"></a>00119 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtForClassB,<span class="stringliteral">"Text for CClassB"</span>);
<a name="l00120"></a>00120 CClassB* theB = CClassB::NewLC();
<a name="l00121"></a>00121 theB->iFixBuffer = KTxtForClassB;
<a name="l00122"></a>00122 theB->iIntValue = -3;
<a name="l00123"></a>00123 theB->iUintValue = 4;
<a name="l00124"></a>00124 theB->iRealValue = 5.6;
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="comment">// Show contents of the CClassA object</span>
<a name="l00127"></a>00127 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtClassAContent,<span class="stringliteral">"CClassA content ..."</span>);
<a name="l00128"></a>00128 doShow(KTxtClassAContent,*theA);
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="comment">// Show contents of the CClassB object</span>
<a name="l00131"></a>00131 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtClassBContent,<span class="stringliteral">"CClassB content ..."</span>);
<a name="l00132"></a>00132 doShow(KTxtClassBContent,*theB);
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="comment">// Construct the output stream.</span>
<a name="l00135"></a>00135 <span class="comment">// The stream id (there is only one) is kept</span>
<a name="l00136"></a>00136 <span class="comment">// in memory.</span>
<a name="l00137"></a>00137 RStoreWriteStream outstream;
<a name="l00138"></a>00138 anId = outstream.CreateLC(aStore);
<a name="l00139"></a>00139
<a name="l00140"></a>00140 <span class="comment">// Stream out the CClassA object first</span>
<a name="l00141"></a>00141 outstream << *theA;
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <span class="comment">// Stream out the CClassB object second</span>
<a name="l00144"></a>00144 outstream << *theB;
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="comment">// Equally we could have done:</span>
<a name="l00147"></a>00147 <span class="comment">// outstream << *theA << *theB;</span>
<a name="l00148"></a>00148 <span class="comment">// to the same effect</span>
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="comment">// Commit changes to the stream</span>
<a name="l00151"></a>00151 outstream.CommitL();
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="comment">// Cleanup the stream object.</span>
<a name="l00154"></a>00154 <span class="comment">// Destroy the CClassB object,</span>
<a name="l00155"></a>00155 <span class="comment">// Destroy the CClassA object,</span>
<a name="l00156"></a>00156 CleanupStack::PopAndDestroy(3);
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158
<a name="l00159"></a>00159 <span class="keyword">static</span> <span class="keywordtype">void</span> doRestoreL(CStreamStore& aStore,<span class="keyword">const</span> TStreamId& anId)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 <span class="comment">// Construct "empty" CClassA and CClassB objects</span>
<a name="l00162"></a>00162 <a class="code" href="class_c_class_a.html">CClassA</a>* theA = CClassA::NewLC();
<a name="l00163"></a>00163 CClassB* theB = CClassB::NewLC();
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="comment">// Construct and open the input stream.</span>
<a name="l00166"></a>00166 <span class="comment">// We want to access the one and only </span>
<a name="l00167"></a>00167 <span class="comment">// stream from the in-memory store.</span>
<a name="l00168"></a>00168 RStoreReadStream instream;
<a name="l00169"></a>00169 instream.OpenLC(aStore,anId);
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="comment">// Stream in the CClassA object first and </span>
<a name="l00172"></a>00172 <span class="comment">// then stream in the CClassB object. This is the order</span>
<a name="l00173"></a>00173 <span class="comment">// in which the objects were streamed out.</span>
<a name="l00174"></a>00174 <span class="comment">//</span>
<a name="l00175"></a>00175 <span class="comment">// NB the order in which the objects are streamed OUT to </span>
<a name="l00176"></a>00176 <span class="comment">// a single stream is arbitrary BUT, whatever the order </span>
<a name="l00177"></a>00177 <span class="comment">// chosen, the objects must be streamed in, in the SAME order</span>
<a name="l00178"></a>00178 <span class="comment">// </span>
<a name="l00179"></a>00179 <span class="comment">// In this example, streaming in has assignment semantics.</span>
<a name="l00180"></a>00180
<a name="l00181"></a>00181 instream >> *theA;
<a name="l00182"></a>00182 instream >> *theB;
<a name="l00183"></a>00183
<a name="l00184"></a>00184 <span class="comment">// Equally we could have done:</span>
<a name="l00185"></a>00185 <span class="comment">// outstream >> *theA >> *theB;</span>
<a name="l00186"></a>00186 <span class="comment">// to the same effect</span>
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="comment">// Cleanup the stream object</span>
<a name="l00189"></a>00189 CleanupStack::PopAndDestroy();
<a name="l00190"></a>00190
<a name="l00191"></a>00191 <span class="comment">// Show restored contents of the CClassA object</span>
<a name="l00192"></a>00192 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtRestoredClassA,<span class="stringliteral">"Restored CClassA content ..."</span>);
<a name="l00193"></a>00193 doShow(KTxtRestoredClassA,*theA);
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="comment">// Show restored contents of the CClassB object</span>
<a name="l00196"></a>00196 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtRestoredClassB,<span class="stringliteral">"Restored CClassB content ..."</span>);
<a name="l00197"></a>00197 doShow(KTxtRestoredClassB,*theB);
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="comment">// Destroy the CClassB object, </span>
<a name="l00200"></a>00200 <span class="comment">// Destroy the CClassA object, </span>
<a name="l00201"></a>00201 CleanupStack::PopAndDestroy(2);
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="keyword">static</span> <span class="keywordtype">void</span> doShow(<span class="keyword">const</span> TDesC& aHeading,<span class="keyword">const</span> <a class="code" href="class_c_class_a.html">CClassA</a>& anA)
<a name="l00205"></a>00205 {
<a name="l00206"></a>00206 console->Printf(KTxtNewLine);
<a name="l00207"></a>00207 console->Printf(aHeading);
<a name="l00208"></a>00208 console->Printf(KFormatType1,anA.iVarBuffer);
<a name="l00209"></a>00209 console->Printf(KFormatType2,anA.iIntValue);
<a name="l00210"></a>00210 console->Printf(KFormatType4,anA.iUintValue);
<a name="l00211"></a>00211 console->Printf(KTxtNewLine);
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213
<a name="l00214"></a>00214 <span class="keyword">static</span> <span class="keywordtype">void</span> doShow(<span class="keyword">const</span> TDesC& aHeading,<span class="keyword">const</span> CClassB& aB)
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216 console->Printf(KTxtNewLine);
<a name="l00217"></a>00217 console->Printf(aHeading);
<a name="l00218"></a>00218 console->Printf(KFormatType1,&aB.iFixBuffer);
<a name="l00219"></a>00219 console->Printf(KFormatType2,aB.iIntValue);
<a name="l00220"></a>00220 console->Printf(KFormatType3,aB.iUintValue);
<a name="l00221"></a>00221 console->Printf(KFormatType5,aB.iRealValue);
<a name="l00222"></a>00222 console->Printf(KTxtNewLine);
<a name="l00223"></a>00223 }
<a name="l00224"></a>00224
<a name="l00225"></a>00225
<a name="l00226"></a>00226 <span class="comment">//***************************************************************</span>
<a name="l00227"></a>00227 <span class="comment">//***************************************************************</span>
<a name="l00228"></a>00228 <a class="code" href="class_c_class_a.html">CClassA</a>* CClassA::NewLC()
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230 <a class="code" href="class_c_class_a.html">CClassA</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_class_a.html">CClassA</a>;
<a name="l00231"></a>00231 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00232"></a>00232 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234
<a name="l00235"></a>00235 CClassA::~CClassA()
<a name="l00236"></a>00236 {
<a name="l00237"></a>00237 <span class="keyword">delete</span> iVarBuffer;
<a name="l00238"></a>00238 }
<a name="l00239"></a>00239
<a name="l00240"></a>00240 <span class="keywordtype">void</span> CClassA::SetTextL(<span class="keyword">const</span> TDesC& aData)
<a name="l00241"></a>00241 {
<a name="l00242"></a>00242 iVarBuffer = aData.AllocL();
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244
<a name="l00245"></a>00245 <span class="keywordtype">void</span> CClassA::ExternalizeL(RWriteStream& aStream)<span class="keyword"> const</span>
<a name="l00246"></a>00246 <span class="keyword"> </span>{
<a name="l00247"></a>00247 aStream.WriteInt32L(iVarBuffer->Des().MaxLength());
<a name="l00248"></a>00248 aStream << *iVarBuffer;
<a name="l00249"></a>00249 aStream.WriteInt32L(iIntValue);
<a name="l00250"></a>00250 aStream.WriteUint32L(iUintValue);
<a name="l00251"></a>00251 }
<a name="l00252"></a>00252
<a name="l00253"></a>00253 <span class="keywordtype">void</span> CClassA::InternalizeL(RReadStream& aStream)
<a name="l00254"></a>00254 {
<a name="l00255"></a>00255 TInt maxlen;
<a name="l00256"></a>00256 maxlen = aStream.ReadInt32L();
<a name="l00257"></a>00257 iVarBuffer = HBufC::NewL(aStream,maxlen);
<a name="l00258"></a>00258 iIntValue = aStream.ReadInt32L();
<a name="l00259"></a>00259 iUintValue = aStream.ReadUint32L();
<a name="l00260"></a>00260 }
<a name="l00261"></a>00261
<a name="l00262"></a>00262
<a name="l00263"></a>00263 <span class="comment">//***************************************************************</span>
<a name="l00264"></a>00264 <span class="comment">//***************************************************************</span>
<a name="l00265"></a>00265 CClassB* CClassB::NewLC()
<a name="l00266"></a>00266 {
<a name="l00267"></a>00267 CClassB* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) CClassB;
<a name="l00268"></a>00268 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00269"></a>00269 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00270"></a>00270 }
<a name="l00271"></a>00271
<a name="l00272"></a>00272 <span class="keywordtype">void</span> CClassB::ExternalizeL(RWriteStream& aStream)<span class="keyword"> const</span>
<a name="l00273"></a>00273 <span class="keyword"> </span>{
<a name="l00274"></a>00274 aStream << iFixBuffer;
<a name="l00275"></a>00275 aStream.WriteInt32L(iIntValue);
<a name="l00276"></a>00276 aStream.WriteUint32L(iUintValue);
<a name="l00277"></a>00277 aStream.WriteReal64L(iRealValue);
<a name="l00278"></a>00278 }
<a name="l00279"></a>00279
<a name="l00280"></a>00280 <span class="keywordtype">void</span> CClassB::InternalizeL(RReadStream& aStream)
<a name="l00281"></a>00281 {
<a name="l00282"></a>00282 aStream >> iFixBuffer;
<a name="l00283"></a>00283 iIntValue = aStream.ReadInt32L();
<a name="l00284"></a>00284 iUintValue = aStream.ReadUint32L();
<a name="l00285"></a>00285 iRealValue = aStream.ReadReal64L();
<a name="l00286"></a>00286 }
<a name="l00287"></a>00287
<a name="l00288"></a>00288
<a name="l00289"></a>00289
<a name="l00290"></a>00290
<a name="l00291"></a>00291
<a name="l00292"></a>00292
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