Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_dynamic_buffers_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/Base/BufsAndStrings/DynamicBuffers/DynamicBuffers.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">//</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="preprocessor">#include "CommonFramework.h"</span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="comment">//</span>
<a name="l00019"></a>00019 <span class="comment">// Common literal text</span>
<a name="l00020"></a>00020 <span class="comment">//</span>
<a name="l00021"></a>00021 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtNewLine,<span class="stringliteral">"\n"</span>);
<a name="l00022"></a>00022
<a name="l00023"></a>00023 LOCAL_C <span class="keywordtype">void</span> writeBuf(CBufBase* aBuf);
<a name="l00024"></a>00024 LOCAL_C <span class="keywordtype">void</span> standardBufferStuffL(CBufBase* aBuf);
<a name="l00025"></a>00025 LOCAL_C <span class="keywordtype">void</span> showExpandL();
<a name="l00026"></a>00026 LOCAL_C <span class="keywordtype">void</span> waitForKey();
<a name="l00027"></a>00027 <span class="comment">//</span>
<a name="l00028"></a>00028 <span class="comment">// do the example</span>
<a name="l00029"></a>00029 <span class="comment">//</span>
<a name="l00030"></a>00030 LOCAL_C <span class="keywordtype">void</span> doExampleL()
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 <span class="comment">//</span>
<a name="l00033"></a>00033 <span class="comment">// do flat buffer demonstration</span>
<a name="l00034"></a>00034 <span class="comment">//</span>
<a name="l00035"></a>00035 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFlatBufDemo,<span class="stringliteral">"Flat buffer demonstration\n"</span>);
<a name="l00036"></a>00036 console->Printf(KTxtFlatBufDemo);
<a name="l00037"></a>00037 CBufFlat* flatBuf=CBufFlat::NewL(4);
<a name="l00038"></a>00038 CleanupStack::PushL(flatBuf);
<a name="l00039"></a>00039 flatBuf->SetReserveL(32);
<a name="l00040"></a>00040 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFlatBufCapacity,<span class="stringliteral">"flat buffer capacity=%d\n"</span>);
<a name="l00041"></a>00041 console->Printf(KTxtFlatBufCapacity,flatBuf->Capacity());
<a name="l00042"></a>00042 standardBufferStuffL(flatBuf);
<a name="l00043"></a>00043 CleanupStack::PopAndDestroy();
<a name="l00044"></a>00044 waitForKey();
<a name="l00045"></a>00045 <span class="comment">//</span>
<a name="l00046"></a>00046 <span class="comment">// do segmented buffer demonstration</span>
<a name="l00047"></a>00047 <span class="comment">//</span>
<a name="l00048"></a>00048 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtSegBufDemo,<span class="stringliteral">"Segmented buffer demonstration\n"</span>);
<a name="l00049"></a>00049 console->Printf(KTxtSegBufDemo);
<a name="l00050"></a>00050 CBufSeg* segBuf=CBufSeg::NewL(4);
<a name="l00051"></a>00051 CleanupStack::PushL(segBuf);
<a name="l00052"></a>00052 standardBufferStuffL(segBuf);
<a name="l00053"></a>00053 CleanupStack::PopAndDestroy();
<a name="l00054"></a>00054 waitForKey();
<a name="l00055"></a>00055 <span class="comment">//</span>
<a name="l00056"></a>00056 <span class="comment">// show ExpandL() and ResizeL()</span>
<a name="l00057"></a>00057 <span class="comment">//</span>
<a name="l00058"></a>00058 showExpandL();
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060
<a name="l00061"></a>00061
<a name="l00062"></a>00062 LOCAL_C <span class="keywordtype">void</span> standardBufferStuffL(CBufBase* aBuf)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064 <span class="comment">//</span>
<a name="l00065"></a>00065 <span class="comment">// insert text into buffer (6 chars)</span>
<a name="l00066"></a>00066 <span class="comment">//</span>
<a name="l00067"></a>00067 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtHello,<span class="stringliteral">"Hello!"</span>);
<a name="l00068"></a>00068 aBuf->InsertL(0,(TAny*)(&KTxtHello)->Ptr(),(&KTxtHello)->Size());
<a name="l00069"></a>00069 writeBuf(aBuf);
<a name="l00070"></a>00070 <span class="comment">//</span>
<a name="l00071"></a>00071 <span class="comment">// append more text into buffer (another 6 chars)</span>
<a name="l00072"></a>00072 <span class="comment">//</span>
<a name="l00073"></a>00073 <span class="comment">//</span>
<a name="l00074"></a>00074 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtWorld,<span class="stringliteral">" world"</span>);
<a name="l00075"></a>00075 aBuf->InsertL(10,(TAny*)(&KTxtWorld)->Ptr(),(&KTxtWorld)->Size());
<a name="l00076"></a>00076 writeBuf(aBuf);
<a name="l00077"></a>00077 <span class="comment">//</span>
<a name="l00078"></a>00078 <span class="comment">// read the 5 characters starting at character</span>
<a name="l00079"></a>00079 <span class="comment">// position 3 from the buffer into a descriptor.</span>
<a name="l00080"></a>00080 <span class="comment">//</span>
<a name="l00081"></a>00081 <span class="comment">//</span>
<a name="l00082"></a>00082 TBuf<5> des;
<a name="l00083"></a>00083 aBuf->Read(6,(TAny*)des.Ptr(),des.Size());
<a name="l00084"></a>00084 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtRead,<span class="stringliteral">"read: %S\n"</span>);
<a name="l00085"></a>00085 console->Printf(KTxtRead,&des);
<a name="l00086"></a>00086 <span class="comment">//</span>
<a name="l00087"></a>00087 <span class="comment">// [over]write 5 characters at character position 6</span>
<a name="l00088"></a>00088 <span class="comment">//</span>
<a name="l00089"></a>00089 <span class="comment">//</span>
<a name="l00090"></a>00090 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFolks,<span class="stringliteral">"folks"</span>);
<a name="l00091"></a>00091 aBuf->Write(12,(TAny*)(&KTxtFolks)->Ptr(),(&KTxtFolks)->Size());
<a name="l00092"></a>00092 writeBuf(aBuf);
<a name="l00093"></a>00093 <span class="comment">//</span>
<a name="l00094"></a>00094 <span class="comment">// delete characters</span>
<a name="l00095"></a>00095 <span class="comment">//</span>
<a name="l00096"></a>00096 TInt startpos = 5;
<a name="l00097"></a>00097 TInt length = 6;
<a name="l00098"></a>00098 startpos <<= 1;
<a name="l00099"></a>00099 length <<= 1;
<a name="l00100"></a>00100 aBuf->Delete(startpos,length);
<a name="l00101"></a>00101 writeBuf(aBuf);
<a name="l00102"></a>00102 <span class="comment">//</span>
<a name="l00103"></a>00103 <span class="comment">// compress</span>
<a name="l00104"></a>00104 <span class="comment">//</span>
<a name="l00105"></a>00105 aBuf->Compress();
<a name="l00106"></a>00106 writeBuf(aBuf);
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108
<a name="l00109"></a>00109 LOCAL_C <span class="keywordtype">void</span> writeBuf(CBufBase* aBuf)
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="comment">//</span>
<a name="l00112"></a>00112 <span class="comment">// print, segment by segment</span>
<a name="l00113"></a>00113 <span class="comment">//</span>
<a name="l00114"></a>00114 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtBuffer,<span class="stringliteral">"buffer:"</span>);
<a name="l00115"></a>00115 console->Printf(KTxtBuffer);
<a name="l00116"></a>00116 TInt bufpos=0;
<a name="l00117"></a>00117 TPtrC8 bufptr=aBuf->Ptr(bufpos);
<a name="l00118"></a>00118 <span class="keywordflow">while</span> (bufptr.Length()>0)
<a name="l00119"></a>00119 {
<a name="l00120"></a>00120 <span class="comment">//</span>
<a name="l00121"></a>00121 <span class="comment">// write out this segment of the buffer.</span>
<a name="l00122"></a>00122 <span class="comment">// Note that the descriptor 'display' is built differently</span>
<a name="l00123"></a>00123 <span class="comment">// for Unicode; it also assumes an even number of bytes;</span>
<a name="l00124"></a>00124 <span class="comment">// this is valid because the granularity of the buffer is 4.</span>
<a name="l00125"></a>00125 <span class="comment">//</span>
<a name="l00126"></a>00126 TPtrC display;
<a name="l00127"></a>00127 display.Set((TUint16*)bufptr.Ptr(),(bufptr.Length()>>1));
<a name="l00128"></a>00128 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat1,<span class="stringliteral">" [%d,%d] %S"</span>);
<a name="l00129"></a>00129 console->Printf(KFormat1, bufpos, bufptr.Length(), &display);
<a name="l00130"></a>00130 <span class="comment">//</span>
<a name="l00131"></a>00131 <span class="comment">// update position within the buffer</span>
<a name="l00132"></a>00132 <span class="comment">// and the pointer-descriptor.</span>
<a name="l00133"></a>00133 <span class="comment">//</span>
<a name="l00134"></a>00134 bufpos+=bufptr.Length(); <span class="comment">// update position</span>
<a name="l00135"></a>00135 bufptr.Set(aBuf->Ptr(bufpos)); <span class="comment">// should be the next segment</span>
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137 console->Printf(KTxtNewLine);
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139
<a name="l00140"></a>00140
<a name="l00141"></a>00141
<a name="l00142"></a>00142 LOCAL_C <span class="keywordtype">void</span> showExpandL()
<a name="l00143"></a>00143 {
<a name="l00144"></a>00144 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtShowExpand,<span class="stringliteral">"Showing ExpandL()\n"</span>);
<a name="l00145"></a>00145 console->Printf(KTxtShowExpand);
<a name="l00146"></a>00146 <span class="comment">//</span>
<a name="l00147"></a>00147 <span class="comment">// allocate the segmented buffer with </span>
<a name="l00148"></a>00148 <span class="comment">// a granularity of 4</span>
<a name="l00149"></a>00149 <span class="comment">//</span>
<a name="l00150"></a>00150 CBufBase* buf=CBufSeg::NewL(4);
<a name="l00151"></a>00151 CleanupStack::PushL(buf);
<a name="l00152"></a>00152 <span class="comment">//</span>
<a name="l00153"></a>00153 <span class="comment">// insert text into buffer (12 UNICODE chars)</span>
<a name="l00154"></a>00154 <span class="comment">//</span>
<a name="l00155"></a>00155 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtHelloWorld,<span class="stringliteral">"Hello world!"</span>);
<a name="l00156"></a>00156 buf->InsertL(0,(TAny*)(&KTxtHelloWorld)->Ptr(),(&KTxtHelloWorld)->Size());
<a name="l00157"></a>00157 <span class="comment">//</span>
<a name="l00158"></a>00158 <span class="comment">// reserve space for (or 16 16-bit chars (32 bytes))</span>
<a name="l00159"></a>00159 <span class="comment">//</span>
<a name="l00160"></a>00160 buf->ExpandL(12,32); <span class="comment">// expand by 32 - may fail</span>
<a name="l00161"></a>00161 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtBufExpanded,<span class="stringliteral">"Buffer expanded with uninitialized space: "</span>);
<a name="l00162"></a>00162 console->Printf(KTxtBufExpanded);
<a name="l00163"></a>00163 writeBuf(buf);
<a name="l00164"></a>00164 <span class="comment">//</span>
<a name="l00165"></a>00165 <span class="comment">// now insert 16 16-bit characters</span>
<a name="l00166"></a>00166 <span class="comment">// one at time.</span>
<a name="l00167"></a>00167 <span class="comment">//</span>
<a name="l00168"></a>00168 <span class="comment">// This is CLEARLY INEFFICIENT but shows</span>
<a name="l00169"></a>00169 <span class="comment">// how successive calls to Write() can be done</span>
<a name="l00170"></a>00170 <span class="comment">// without risk of failing for lack of memory.</span>
<a name="l00171"></a>00171 <span class="comment">//</span>
<a name="l00172"></a>00172 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtAtoP,<span class="stringliteral">"abcdefghijklmnop"</span>);
<a name="l00173"></a>00173 TBufC<16> source(KTxtAtoP);
<a name="l00174"></a>00174 <span class="keywordflow">for</span> (TInt i=0; i<16; i++)
<a name="l00175"></a>00175 {
<a name="l00176"></a>00176 buf->Write((i+6)<<1,(TAny*)&source[i],2);
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtExpandedFilled,<span class="stringliteral">"expanded space filled: "</span>);
<a name="l00179"></a>00179 console->Printf(KTxtExpandedFilled);
<a name="l00180"></a>00180 writeBuf(buf);
<a name="l00181"></a>00181 <span class="comment">//</span>
<a name="l00182"></a>00182 <span class="comment">// now adjust size down to 18</span>
<a name="l00183"></a>00183 <span class="comment">//</span>
<a name="l00184"></a>00184 buf->ResizeL(18);
<a name="l00185"></a>00185 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtResized,<span class="stringliteral">"resized:"</span>);
<a name="l00186"></a>00186 console->Printf(KTxtResized);
<a name="l00187"></a>00187 writeBuf(buf);
<a name="l00188"></a>00188 <span class="comment">//</span>
<a name="l00189"></a>00189 <span class="comment">// destroy buffer</span>
<a name="l00190"></a>00190 <span class="comment">//</span>
<a name="l00191"></a>00191 CleanupStack::PopAndDestroy();
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193
<a name="l00194"></a>00194 LOCAL_C <span class="keywordtype">void</span> waitForKey()
<a name="l00195"></a>00195 {
<a name="l00196"></a>00196 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtPressAnyKey,<span class="stringliteral">"[press any key]"</span>);
<a name="l00197"></a>00197 console->Printf(KTxtPressAnyKey);
<a name="l00198"></a>00198 console->Getch();
<a name="l00199"></a>00199 console->Printf(KTxtNewLine);
<a name="l00200"></a>00200 }
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