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3 <title>TB10.1 Example Applications: examples/Base/BufsAndStrings/DynamicBuffers/DynamicBuffers.cpp Source File</title> |
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8 <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> |
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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">//</span> |
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22 <a name="l00015"></a>00015 |
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23 <a name="l00016"></a>00016 <span class="preprocessor">#include "CommonFramework.h"</span> |
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24 <a name="l00017"></a>00017 |
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25 <a name="l00018"></a>00018 <span class="comment">//</span> |
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26 <a name="l00019"></a>00019 <span class="comment">// Common literal text</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 _LIT(KTxtNewLine,<span class="stringliteral">"\n"</span>); |
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29 <a name="l00022"></a>00022 |
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30 <a name="l00023"></a>00023 LOCAL_C <span class="keywordtype">void</span> writeBuf(CBufBase* aBuf); |
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31 <a name="l00024"></a>00024 LOCAL_C <span class="keywordtype">void</span> standardBufferStuffL(CBufBase* aBuf); |
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32 <a name="l00025"></a>00025 LOCAL_C <span class="keywordtype">void</span> showExpandL(); |
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33 <a name="l00026"></a>00026 LOCAL_C <span class="keywordtype">void</span> waitForKey(); |
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34 <a name="l00027"></a>00027 <span class="comment">//</span> |
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35 <a name="l00028"></a>00028 <span class="comment">// do the example</span> |
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36 <a name="l00029"></a>00029 <span class="comment">//</span> |
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37 <a name="l00030"></a>00030 LOCAL_C <span class="keywordtype">void</span> doExampleL() |
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38 <a name="l00031"></a>00031 { |
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39 <a name="l00032"></a>00032 <span class="comment">//</span> |
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40 <a name="l00033"></a>00033 <span class="comment">// do flat buffer demonstration</span> |
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41 <a name="l00034"></a>00034 <span class="comment">//</span> |
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42 <a name="l00035"></a>00035 _LIT(KTxtFlatBufDemo,<span class="stringliteral">"Flat buffer demonstration\n"</span>); |
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43 <a name="l00036"></a>00036 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtFlatBufDemo); |
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44 <a name="l00037"></a>00037 CBufFlat* flatBuf=CBufFlat::NewL(4); |
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45 <a name="l00038"></a>00038 CleanupStack::PushL(flatBuf); |
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46 <a name="l00039"></a>00039 flatBuf->SetReserveL(32); |
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47 <a name="l00040"></a>00040 _LIT(KTxtFlatBufCapacity,<span class="stringliteral">"flat buffer capacity=%d\n"</span>); |
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48 <a name="l00041"></a>00041 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtFlatBufCapacity,flatBuf->Capacity()); |
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49 <a name="l00042"></a>00042 standardBufferStuffL(flatBuf); |
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50 <a name="l00043"></a>00043 CleanupStack::PopAndDestroy(); |
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51 <a name="l00044"></a>00044 waitForKey(); |
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52 <a name="l00045"></a>00045 <span class="comment">//</span> |
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53 <a name="l00046"></a>00046 <span class="comment">// do segmented buffer demonstration</span> |
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54 <a name="l00047"></a>00047 <span class="comment">//</span> |
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55 <a name="l00048"></a>00048 _LIT(KTxtSegBufDemo,<span class="stringliteral">"Segmented buffer demonstration\n"</span>); |
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56 <a name="l00049"></a>00049 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtSegBufDemo); |
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57 <a name="l00050"></a>00050 CBufSeg* segBuf=CBufSeg::NewL(4); |
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58 <a name="l00051"></a>00051 CleanupStack::PushL(segBuf); |
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59 <a name="l00052"></a>00052 standardBufferStuffL(segBuf); |
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60 <a name="l00053"></a>00053 CleanupStack::PopAndDestroy(); |
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61 <a name="l00054"></a>00054 waitForKey(); |
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62 <a name="l00055"></a>00055 <span class="comment">//</span> |
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63 <a name="l00056"></a>00056 <span class="comment">// show ExpandL() and ResizeL()</span> |
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64 <a name="l00057"></a>00057 <span class="comment">//</span> |
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65 <a name="l00058"></a>00058 showExpandL(); |
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66 <a name="l00059"></a>00059 } |
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67 <a name="l00060"></a>00060 |
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68 <a name="l00061"></a>00061 |
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69 <a name="l00062"></a>00062 LOCAL_C <span class="keywordtype">void</span> standardBufferStuffL(CBufBase* aBuf) |
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70 <a name="l00063"></a>00063 { |
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71 <a name="l00064"></a>00064 <span class="comment">//</span> |
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72 <a name="l00065"></a>00065 <span class="comment">// insert text into buffer (6 chars)</span> |
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73 <a name="l00066"></a>00066 <span class="comment">//</span> |
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74 <a name="l00067"></a>00067 _LIT(KTxtHello,<span class="stringliteral">"Hello!"</span>); |
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75 <a name="l00068"></a>00068 aBuf->InsertL(0,(TAny*)(&KTxtHello)->Ptr(),(&KTxtHello)->Size()); |
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76 <a name="l00069"></a>00069 writeBuf(aBuf); |
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77 <a name="l00070"></a>00070 <span class="comment">//</span> |
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78 <a name="l00071"></a>00071 <span class="comment">// append more text into buffer (another 6 chars)</span> |
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79 <a name="l00072"></a>00072 <span class="comment">//</span> |
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80 <a name="l00073"></a>00073 <span class="comment">//</span> |
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81 <a name="l00074"></a>00074 _LIT(KTxtWorld,<span class="stringliteral">" world"</span>); |
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82 <a name="l00075"></a>00075 aBuf->InsertL(10,(TAny*)(&KTxtWorld)->Ptr(),(&KTxtWorld)->Size()); |
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83 <a name="l00076"></a>00076 writeBuf(aBuf); |
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84 <a name="l00077"></a>00077 <span class="comment">//</span> |
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85 <a name="l00078"></a>00078 <span class="comment">// read the 5 characters starting at character</span> |
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86 <a name="l00079"></a>00079 <span class="comment">// position 3 from the buffer into a descriptor.</span> |
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87 <a name="l00080"></a>00080 <span class="comment">//</span> |
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88 <a name="l00081"></a>00081 <span class="comment">//</span> |
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89 <a name="l00082"></a>00082 TBuf<5> des; |
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90 <a name="l00083"></a>00083 aBuf->Read(6,(TAny*)des.Ptr(),des.Size()); |
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91 <a name="l00084"></a>00084 _LIT(KTxtRead,<span class="stringliteral">"read: %S\n"</span>); |
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92 <a name="l00085"></a>00085 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtRead,&des); |
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93 <a name="l00086"></a>00086 <span class="comment">//</span> |
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94 <a name="l00087"></a>00087 <span class="comment">// [over]write 5 characters at character position 6</span> |
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95 <a name="l00088"></a>00088 <span class="comment">//</span> |
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96 <a name="l00089"></a>00089 <span class="comment">//</span> |
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97 <a name="l00090"></a>00090 _LIT(KTxtFolks,<span class="stringliteral">"folks"</span>); |
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98 <a name="l00091"></a>00091 aBuf->Write(12,(TAny*)(&KTxtFolks)->Ptr(),(&KTxtFolks)->Size()); |
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99 <a name="l00092"></a>00092 writeBuf(aBuf); |
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100 <a name="l00093"></a>00093 <span class="comment">//</span> |
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101 <a name="l00094"></a>00094 <span class="comment">// delete characters</span> |
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102 <a name="l00095"></a>00095 <span class="comment">//</span> |
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103 <a name="l00096"></a>00096 TInt startpos = 5; |
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104 <a name="l00097"></a>00097 TInt length = 6; |
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105 <a name="l00098"></a>00098 startpos <<= 1; |
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106 <a name="l00099"></a>00099 length <<= 1; |
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107 <a name="l00100"></a>00100 aBuf->Delete(startpos,length); |
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108 <a name="l00101"></a>00101 writeBuf(aBuf); |
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109 <a name="l00102"></a>00102 <span class="comment">//</span> |
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110 <a name="l00103"></a>00103 <span class="comment">// compress</span> |
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111 <a name="l00104"></a>00104 <span class="comment">//</span> |
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112 <a name="l00105"></a>00105 aBuf->Compress(); |
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113 <a name="l00106"></a>00106 writeBuf(aBuf); |
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114 <a name="l00107"></a>00107 } |
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115 <a name="l00108"></a>00108 |
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116 <a name="l00109"></a>00109 LOCAL_C <span class="keywordtype">void</span> writeBuf(CBufBase* aBuf) |
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117 <a name="l00110"></a>00110 { |
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118 <a name="l00111"></a>00111 <span class="comment">//</span> |
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119 <a name="l00112"></a>00112 <span class="comment">// print, segment by segment</span> |
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120 <a name="l00113"></a>00113 <span class="comment">//</span> |
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121 <a name="l00114"></a>00114 _LIT(KTxtBuffer,<span class="stringliteral">"buffer:"</span>); |
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122 <a name="l00115"></a>00115 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtBuffer); |
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123 <a name="l00116"></a>00116 TInt bufpos=0; |
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124 <a name="l00117"></a>00117 TPtrC8 bufptr=aBuf->Ptr(bufpos); |
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125 <a name="l00118"></a>00118 <span class="keywordflow">while</span> (bufptr.Length()>0) |
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126 <a name="l00119"></a>00119 { |
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127 <a name="l00120"></a>00120 <span class="comment">//</span> |
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128 <a name="l00121"></a>00121 <span class="comment">// write out this segment of the buffer.</span> |
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129 <a name="l00122"></a>00122 <span class="comment">// Note that the descriptor 'display' is built differently</span> |
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130 <a name="l00123"></a>00123 <span class="comment">// for Unicode; it also assumes an even number of bytes;</span> |
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131 <a name="l00124"></a>00124 <span class="comment">// this is valid because the granularity of the buffer is 4.</span> |
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132 <a name="l00125"></a>00125 <span class="comment">//</span> |
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133 <a name="l00126"></a>00126 TPtrC display; |
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134 <a name="l00127"></a>00127 display.Set((TUint16*)bufptr.Ptr(),(bufptr.Length()>>1)); |
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135 <a name="l00128"></a>00128 _LIT(KFormat1,<span class="stringliteral">" [%d,%d] %S"</span>); |
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136 <a name="l00129"></a>00129 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KFormat1, bufpos, bufptr.Length(), &display); |
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137 <a name="l00130"></a>00130 <span class="comment">//</span> |
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138 <a name="l00131"></a>00131 <span class="comment">// update position within the buffer</span> |
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139 <a name="l00132"></a>00132 <span class="comment">// and the pointer-descriptor.</span> |
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140 <a name="l00133"></a>00133 <span class="comment">//</span> |
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141 <a name="l00134"></a>00134 bufpos+=bufptr.Length(); <span class="comment">// update position</span> |
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142 <a name="l00135"></a>00135 bufptr.Set(aBuf->Ptr(bufpos)); <span class="comment">// should be the next segment</span> |
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143 <a name="l00136"></a>00136 } |
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144 <a name="l00137"></a>00137 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtNewLine); |
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145 <a name="l00138"></a>00138 } |
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146 <a name="l00139"></a>00139 |
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147 <a name="l00140"></a>00140 |
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148 <a name="l00141"></a>00141 |
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149 <a name="l00142"></a>00142 LOCAL_C <span class="keywordtype">void</span> showExpandL() |
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150 <a name="l00143"></a>00143 { |
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151 <a name="l00144"></a>00144 _LIT(KTxtShowExpand,<span class="stringliteral">"Showing ExpandL()\n"</span>); |
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152 <a name="l00145"></a>00145 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtShowExpand); |
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153 <a name="l00146"></a>00146 <span class="comment">//</span> |
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154 <a name="l00147"></a>00147 <span class="comment">// allocate the segmented buffer with </span> |
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155 <a name="l00148"></a>00148 <span class="comment">// a granularity of 4</span> |
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156 <a name="l00149"></a>00149 <span class="comment">//</span> |
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157 <a name="l00150"></a>00150 CBufBase* buf=CBufSeg::NewL(4); |
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158 <a name="l00151"></a>00151 CleanupStack::PushL(buf); |
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159 <a name="l00152"></a>00152 <span class="comment">//</span> |
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160 <a name="l00153"></a>00153 <span class="comment">// insert text into buffer (12 UNICODE chars)</span> |
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161 <a name="l00154"></a>00154 <span class="comment">//</span> |
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162 <a name="l00155"></a>00155 _LIT(KTxtHelloWorld,<span class="stringliteral">"Hello world!"</span>); |
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163 <a name="l00156"></a>00156 buf->InsertL(0,(TAny*)(&KTxtHelloWorld)->Ptr(),(&KTxtHelloWorld)->Size()); |
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164 <a name="l00157"></a>00157 <span class="comment">//</span> |
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165 <a name="l00158"></a>00158 <span class="comment">// reserve space for (or 16 16-bit chars (32 bytes))</span> |
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166 <a name="l00159"></a>00159 <span class="comment">//</span> |
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167 <a name="l00160"></a>00160 buf->ExpandL(12,32); <span class="comment">// expand by 32 - may fail</span> |
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168 <a name="l00161"></a>00161 _LIT(KTxtBufExpanded,<span class="stringliteral">"Buffer expanded with uninitialized space: "</span>); |
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169 <a name="l00162"></a>00162 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtBufExpanded); |
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170 <a name="l00163"></a>00163 writeBuf(buf); |
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171 <a name="l00164"></a>00164 <span class="comment">//</span> |
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172 <a name="l00165"></a>00165 <span class="comment">// now insert 16 16-bit characters</span> |
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173 <a name="l00166"></a>00166 <span class="comment">// one at time.</span> |
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174 <a name="l00167"></a>00167 <span class="comment">//</span> |
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175 <a name="l00168"></a>00168 <span class="comment">// This is CLEARLY INEFFICIENT but shows</span> |
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176 <a name="l00169"></a>00169 <span class="comment">// how successive calls to Write() can be done</span> |
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177 <a name="l00170"></a>00170 <span class="comment">// without risk of failing for lack of memory.</span> |
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178 <a name="l00171"></a>00171 <span class="comment">//</span> |
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179 <a name="l00172"></a>00172 _LIT(KTxtAtoP,<span class="stringliteral">"abcdefghijklmnop"</span>); |
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180 <a name="l00173"></a>00173 TBufC<16> source(KTxtAtoP); |
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181 <a name="l00174"></a>00174 <span class="keywordflow">for</span> (TInt i=0; i<16; i++) |
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182 <a name="l00175"></a>00175 { |
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183 <a name="l00176"></a>00176 buf->Write((i+6)<<1,(TAny*)&source[i],2); |
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184 <a name="l00177"></a>00177 } |
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185 <a name="l00178"></a>00178 _LIT(KTxtExpandedFilled,<span class="stringliteral">"expanded space filled: "</span>); |
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186 <a name="l00179"></a>00179 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtExpandedFilled); |
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187 <a name="l00180"></a>00180 writeBuf(buf); |
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188 <a name="l00181"></a>00181 <span class="comment">//</span> |
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189 <a name="l00182"></a>00182 <span class="comment">// now adjust size down to 18</span> |
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190 <a name="l00183"></a>00183 <span class="comment">//</span> |
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191 <a name="l00184"></a>00184 buf->ResizeL(18); |
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192 <a name="l00185"></a>00185 _LIT(KTxtResized,<span class="stringliteral">"resized:"</span>); |
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193 <a name="l00186"></a>00186 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtResized); |
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194 <a name="l00187"></a>00187 writeBuf(buf); |
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195 <a name="l00188"></a>00188 <span class="comment">//</span> |
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196 <a name="l00189"></a>00189 <span class="comment">// destroy buffer</span> |
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197 <a name="l00190"></a>00190 <span class="comment">//</span> |
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198 <a name="l00191"></a>00191 CleanupStack::PopAndDestroy(); |
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199 <a name="l00192"></a>00192 } |
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200 <a name="l00193"></a>00193 |
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201 <a name="l00194"></a>00194 LOCAL_C <span class="keywordtype">void</span> waitForKey() |
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202 <a name="l00195"></a>00195 { |
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203 <a name="l00196"></a>00196 _LIT(KTxtPressAnyKey,<span class="stringliteral">"[press any key]"</span>); |
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204 <a name="l00197"></a>00197 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtPressAnyKey); |
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205 <a name="l00198"></a>00198 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Getch(); |
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206 <a name="l00199"></a>00199 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtNewLine); |
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207 <a name="l00200"></a>00200 } |
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208 </pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Thu Jan 21 10:32:55 2010 for TB10.1 Example Applications by |
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209 <a href="http://www.doxygen.org/index.html"> |
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210 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.3 </small></address> |
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211 </body> |
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212 </html> |