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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/fileaccessexample_8c_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/PIPS/FileAccessExample/fileaccessexample.c Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/PIPS/FileAccessExample/fileaccessexample.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// fileaccessexample.c</span>
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<a name="l00002"></a>00002 <span class="comment">//</span>
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<a name="l00003"></a>00003 <span class="comment">// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00004"></a>00004 <span class="comment">// All rights reserved.</span>
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<a name="l00005"></a>00005 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00006"></a>00006 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00007"></a>00007 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00008"></a>00008 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00009"></a>00009 <span class="comment">//</span>
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<a name="l00010"></a>00010 <span class="comment">// Initial Contributors:</span>
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<a name="l00011"></a>00011 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Contributors:</span>
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<a name="l00014"></a>00014 <span class="comment">//</span>
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<a name="l00015"></a>00015 <span class="comment">// Description:</span>
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<a name="l00016"></a>00016 <span class="comment">// Component description file</span>
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<a name="l00017"></a>00017 <span class="comment">//</span>
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<a name="l00018"></a>00018
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<a name="l00019"></a>00019 <span class="comment">// This example demonstrates the Symbian platform Platform Security model.</span>
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<a name="l00020"></a>00020 <span class="comment">// This shows the restrictions on the directories that can be accessed by a program, </span>
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<a name="l00021"></a>00021 <span class="comment">// depending on the capabilities that the program has.</span>
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<a name="l00022"></a>00022
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<a name="l00023"></a>00023 <span class="comment">// Include files</span>
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<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
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<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;errno.h&gt;</span>
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<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
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<a name="l00027"></a>00027 <span class="preprocessor">#include &lt;unistd.h&gt;</span>
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<a name="l00028"></a>00028 <span class="preprocessor">#include &lt;sys/stat.h&gt;</span>
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<a name="l00029"></a>00029
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<a name="l00033"></a>00033 <span class="keywordtype">void</span> PressAKey()
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<a name="l00034"></a>00034         {
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<a name="l00035"></a>00035         fflush(stdout);
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<a name="l00036"></a>00036         getchar();
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<a name="l00037"></a>00037         }
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<a name="l00042"></a>00042 <span class="keywordtype">int</span> DisplayErrorMessage(<span class="keywordtype">char</span> msg[])
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<a name="l00043"></a>00043         {
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<a name="l00044"></a>00044         printf(<span class="stringliteral">&quot;%s [Error NUMBER = %d]\n&quot;</span>,msg,errno);
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<a name="l00045"></a>00045         PressAKey();
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<a name="l00046"></a>00046         <span class="keywordflow">return</span> EXIT_FAILURE;
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<a name="l00047"></a>00047         }
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<a name="l00052"></a>00052 <span class="keywordtype">void</span> CreateASecureDirectory()
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<a name="l00053"></a>00053         {
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<a name="l00054"></a>00054         <span class="keywordtype">int</span> result;
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<a name="l00055"></a>00055
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<a name="l00061"></a>00061         result = mkdir(<span class="stringliteral">&quot;mydirectory&quot;</span>,S_IWUSR);
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<a name="l00062"></a>00062         <span class="keywordflow">if</span>(result == 0)
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<a name="l00063"></a>00063                 {
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<a name="l00064"></a>00064                 printf(<span class="stringliteral">&quot; A secure directory for the program is created successfully\n&quot;</span>);
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<a name="l00065"></a>00065                 PressAKey();
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<a name="l00066"></a>00066                 }
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<a name="l00067"></a>00067         <span class="keywordflow">else</span>
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<a name="l00068"></a>00068                 {
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<a name="l00069"></a>00069                 DisplayErrorMessage(<span class="stringliteral">&quot;\nError in creating directory\n&quot;</span>);
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<a name="l00070"></a>00070                 PressAKey();
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<a name="l00071"></a>00071                 }
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<a name="l00072"></a>00072         }
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<a name="l00077"></a>00077 <span class="keywordtype">void</span> WriteDataToAFile(<span class="keywordtype">char</span> FileName[])
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<a name="l00078"></a>00078         {
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<a name="l00079"></a>00079         FILE* fp= NULL;
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<a name="l00080"></a>00080
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<a name="l00086"></a>00086         fp = fopen(FileName, <span class="stringliteral">&quot;w&quot;</span>);
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<a name="l00087"></a>00087         <span class="keywordflow">if</span> (fp== NULL)
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<a name="l00088"></a>00088                 {
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<a name="l00089"></a>00089                 DisplayErrorMessage(<span class="stringliteral">&quot;\nError in writing data in to the file=%d&quot;</span>);
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<a name="l00090"></a>00090                 PressAKey();
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<a name="l00091"></a>00091                 }
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<a name="l00092"></a>00092         <span class="keywordflow">else</span>
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<a name="l00093"></a>00093                 {
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<a name="l00094"></a>00094                 fprintf(fp,<span class="stringliteral">&quot;%s&quot;</span>,<span class="stringliteral">&quot;hello&quot;</span>);
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<a name="l00095"></a>00095                 fflush(fp);
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<a name="l00096"></a>00096                 fclose(fp);
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<a name="l00097"></a>00097                 printf(<span class="stringliteral">&quot; Writing data in to the file from the secure directory is successful&quot;</span>);
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<a name="l00098"></a>00098                 }
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<a name="l00099"></a>00099         }
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<a name="l00100"></a>00100
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<a name="l00105"></a>00105 <span class="keywordtype">void</span> ReadDataFromAFile(<span class="keywordtype">char</span> FileName[])
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<a name="l00106"></a>00106         {
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<a name="l00107"></a>00107         FILE* fp= NULL;
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<a name="l00108"></a>00108
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<a name="l00114"></a>00114         fp = fopen(FileName, <span class="stringliteral">&quot;r&quot;</span>);
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<a name="l00115"></a>00115         <span class="keywordflow">if</span> (fp == NULL)
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<a name="l00116"></a>00116                 {
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<a name="l00117"></a>00117         DisplayErrorMessage(<span class="stringliteral">&quot;\nError in reading data from the file = %d&quot;</span>);
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<a name="l00118"></a>00118         printf(<span class="stringliteral">&quot; Press any key to exit from the example&quot;</span>);
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<a name="l00119"></a>00119         PressAKey();
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<a name="l00120"></a>00120                 }
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<a name="l00121"></a>00121         <span class="keywordflow">else</span>
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<a name="l00122"></a>00122                 {
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<a name="l00123"></a>00123                 <span class="keywordtype">char</span> x[30];
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<a name="l00124"></a>00124
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<a name="l00125"></a>00125                 <span class="comment">// Seek to the beginning of the file</span>
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<a name="l00126"></a>00126         fseek(fp, SEEK_SET, 0);
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<a name="l00127"></a>00127
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<a name="l00128"></a>00128         <span class="comment">// Get the data present in file from the beginning </span>
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<a name="l00129"></a>00129                 fscanf(fp,<span class="stringliteral">&quot;%s&quot;</span>,x);
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   106
 
<a name="l00130"></a>00130                 printf(<span class="stringliteral">&quot;\n Data present in the file is : %s&quot;</span>,x);
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   107
 
<a name="l00131"></a>00131                 fclose(fp);
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diff changeset 
   108
 
<a name="l00132"></a>00132                 printf(<span class="stringliteral">&quot;\n Reading data of the file from the directory is successful\n&quot;</span>);
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   109
 
<a name="l00133"></a>00133                 }
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<a name="l00134"></a>00134         }
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diff changeset 
   111
 
<a name="l00139"></a>00139 <span class="keywordtype">void</span> RemoveADirectory(<span class="keywordtype">char</span> FileName[])
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diff changeset 
   112
 
<a name="l00140"></a>00140         {
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   113
 
<a name="l00141"></a>00141         <span class="keywordtype">int</span> result;
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diff changeset 
   114
 
<a name="l00142"></a>00142
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   115
 
<a name="l00148"></a>00148         result = <span class="keyword">remove</span>(FileName);
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   116
 
<a name="l00149"></a>00149         <span class="keywordflow">if</span>(result == 0)
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   117
 
<a name="l00150"></a>00150                         {
43e37759235e Week 12 contribution of example code"
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   118
 
<a name="l00151"></a>00151                         printf(<span class="stringliteral">&quot; Removing the file from the directory is successful\n&quot;</span>);
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   119
 
<a name="l00152"></a>00152                         }
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   120
 
<a name="l00153"></a>00153                 <span class="keywordflow">else</span>
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diff changeset 
   121
 
<a name="l00154"></a>00154                         {
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   122
 
<a name="l00155"></a>00155                         DisplayErrorMessage(<span class="stringliteral">&quot; Error in removing the file from the directory=%d&quot;</span>);
43e37759235e Week 12 contribution of example code"
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   123
 
<a name="l00156"></a>00156                         PressAKey();
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   124
 
<a name="l00157"></a>00157                         }
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   125
 
<a name="l00163"></a>00163         result = rmdir(<span class="stringliteral">&quot;mydirectory&quot;</span>);
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diff changeset 
   126
 
<a name="l00164"></a>00164
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   127
 
<a name="l00165"></a>00165         <span class="keywordflow">if</span>(result == 0)
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diff changeset 
   128
 
<a name="l00166"></a>00166                 {
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   129
 
<a name="l00167"></a>00167                 printf(<span class="stringliteral">&quot; Removing the the directory is successful\n&quot;</span>);
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   130
 
<a name="l00168"></a>00168                 PressAKey();
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   131
 
<a name="l00169"></a>00169                 }
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   132
 
<a name="l00170"></a>00170         <span class="keywordflow">else</span>
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diff changeset 
   133
 
<a name="l00171"></a>00171                 {
43e37759235e Week 12 contribution of example code"
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diff changeset 
   134
 
<a name="l00172"></a>00172                 DisplayErrorMessage(<span class="stringliteral">&quot; Error in removing the directory=%d&quot;</span>);
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   135
 
<a name="l00173"></a>00173                 PressAKey();
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   136
 
<a name="l00174"></a>00174                 }
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   137
 
<a name="l00175"></a>00175         }
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   138
 
<a name="l00180"></a>00180 <span class="keywordtype">void</span> WriteDataToFileOfAnotherProgram(<span class="keywordtype">char</span> FileName[])
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   139
 
<a name="l00181"></a>00181         {
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   140
 
<a name="l00182"></a>00182         FILE* fp= NULL;
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diff changeset 
   141
 
<a name="l00183"></a>00183
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diff changeset 
   142
 
<a name="l00189"></a>00189         fp = fopen(FileName, <span class="stringliteral">&quot;w&quot;</span>);
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   143
 
<a name="l00190"></a>00190
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diff changeset 
   144
 
<a name="l00191"></a>00191         <span class="keywordflow">if</span> (fp == NULL)
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diff changeset 
   145
 
<a name="l00192"></a>00192                 {
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diff changeset 
   146
 
<a name="l00193"></a>00193                 printf(<span class="stringliteral">&quot; Writing data to files in a private directory belonging to another program is not possible&quot;</span>);
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<a name="l00194"></a>00194         }
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   148
 
<a name="l00195"></a>00195         <span class="keywordflow">else</span>
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diff changeset 
   149
 
<a name="l00196"></a>00196                 {
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diff changeset 
   150
 
<a name="l00197"></a>00197                 printf(<span class="stringliteral">&quot;\n Writing data to files in a private directory belonging to another program is possible&quot;</span>);
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parents:
diff changeset 
   151
 
<a name="l00198"></a>00198                 PressAKey();
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   152
 
<a name="l00199"></a>00199                 }
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   153
 
<a name="l00200"></a>00200         }
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   154
 
<a name="l00205"></a>00205 <span class="keywordtype">void</span> ReadDataFromFileOfAnotherProgram(<span class="keywordtype">char</span> FileName[])
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   155
 
<a name="l00206"></a>00206         {
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   156
 
<a name="l00207"></a>00207         FILE* fp= NULL;
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diff changeset 
   157
 
<a name="l00208"></a>00208
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   158
 
<a name="l00214"></a>00214         fp = fopen(FileName, <span class="stringliteral">&quot;r&quot;</span>);
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   159
 
<a name="l00215"></a>00215
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   160
 
<a name="l00216"></a>00216         <span class="keywordflow">if</span> (fp == NULL)
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diff changeset 
   161
 
<a name="l00217"></a>00217                 {
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diff changeset 
   162
 
<a name="l00218"></a>00218                 printf(<span class="stringliteral">&quot;\n Reading data from files in a private directory belonging to another program is not possible&quot;</span>);
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diff changeset 
   163
 
<a name="l00219"></a>00219                 PressAKey();
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diff changeset 
   164
 
<a name="l00220"></a>00220                 }
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   165
 
<a name="l00221"></a>00221         <span class="keywordflow">else</span>
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diff changeset 
   166
 
<a name="l00222"></a>00222                 {
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diff changeset 
   167
 
<a name="l00223"></a>00223                 printf(<span class="stringliteral">&quot;\n Reading data from files in a private directory belonging to another program is possible&quot;</span>);
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   168
 
<a name="l00224"></a>00224                 PressAKey();
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   169
 
<a name="l00225"></a>00225                 }
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<a name="l00226"></a>00226         }
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   171
 
<a name="l00231"></a>00231 <span class="keywordtype">void</span> WriteDataToFileOfSysBin(<span class="keywordtype">char</span> FileName[])
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diff changeset 
   172
 
<a name="l00232"></a>00232         {
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<a name="l00233"></a>00233         FILE* fp= NULL;
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diff changeset 
   174
 
<a name="l00234"></a>00234
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   175
 
<a name="l00240"></a>00240         fp = fopen(FileName, <span class="stringliteral">&quot;w&quot;</span>);
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   176
 
<a name="l00241"></a>00241
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   177
 
<a name="l00242"></a>00242         <span class="keywordflow">if</span> (fp == NULL)
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   178
 
<a name="l00243"></a>00243                 {
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   179
 
<a name="l00244"></a>00244                 printf(<span class="stringliteral">&quot;\n Writing data to files in the sys/bin directory is not possible&quot;</span>);
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   180
 
<a name="l00245"></a>00245                 }
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   181
 
<a name="l00246"></a>00246         <span class="keywordflow">else</span>
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diff changeset 
   182
 
<a name="l00247"></a>00247                 {
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diff changeset 
   183
 
<a name="l00248"></a>00248                 printf(<span class="stringliteral">&quot;\n Writing data to files in the sys/bin directory is possible&quot;</span>);
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   184
 
<a name="l00249"></a>00249                 PressAKey();
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diff changeset 
   185
 
<a name="l00250"></a>00250                 }
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   186
 
<a name="l00251"></a>00251         }
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   187
 
<a name="l00256"></a>00256 <span class="keywordtype">void</span> ReadDataToFileOfSysBin(<span class="keywordtype">char</span> FileName[])
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diff changeset 
   188
 
<a name="l00257"></a>00257         {
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   189
 
<a name="l00258"></a>00258         FILE* fp = NULL;
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diff changeset 
   190
 
<a name="l00259"></a>00259
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diff changeset 
   191
 
<a name="l00265"></a>00265         fp = fopen(FileName, <span class="stringliteral">&quot;r&quot;</span>);
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<a name="l00266"></a>00266
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diff changeset 
   193
 
<a name="l00267"></a>00267         <span class="keywordflow">if</span> (fp == NULL)
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diff changeset 
   194
 
<a name="l00268"></a>00268                 {
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diff changeset 
   195
 
<a name="l00269"></a>00269                 printf(<span class="stringliteral">&quot;\n Reading data from files in the sys/bin directory is not possible&quot;</span>);
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diff changeset 
   196
 
<a name="l00270"></a>00270                 PressAKey();
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diff changeset 
   197
 
<a name="l00271"></a>00271                 }
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diff changeset 
   198
 
<a name="l00272"></a>00272         <span class="keywordflow">else</span>
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diff changeset 
   199
 
<a name="l00273"></a>00273                 {
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diff changeset 
   200
 
<a name="l00274"></a>00274                 printf(<span class="stringliteral">&quot;\n Reading data from files in the sys/bin directory is possible&quot;</span>);
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parents:
diff changeset 
   201
 
<a name="l00275"></a>00275                 printf(<span class="stringliteral">&quot; Press any key to exit from the example&quot;</span>);
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parents:
diff changeset 
   202
 
<a name="l00276"></a>00276                 PressAKey();
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diff changeset 
   203
 
<a name="l00277"></a>00277                 }
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   204
 
<a name="l00278"></a>00278         }
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   205
 
<a name="l00279"></a>00279
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   206
 
<a name="l00280"></a>00280 <span class="keywordtype">int</span> <a class="code" href="redirectprintf_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>()
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diff changeset 
   207
 
<a name="l00281"></a>00281 {
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   208
 
<a name="l00282"></a>00282         <span class="keywordtype">char</span> ownFileName[50] = <span class="stringliteral">&quot;\\private\\e80000c9\\mydirectory\\myownfile.txt&quot;</span>;
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<a name="l00283"></a>00283         <span class="keywordtype">char</span> otherFileName[40] = <span class="stringliteral">&quot;\\private\\e80000c8\\otherfile.txt&quot;</span>;
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<a name="l00284"></a>00284         <span class="keywordtype">char</span> sysBinFileName[30] = <span class="stringliteral">&quot;\\sys\\bin\\euser.dll&quot;</span>;
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   211
 
<a name="l00285"></a>00285
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   212
 
<a name="l00286"></a>00286         printf(<span class="stringliteral">&quot;\n Welcome to the file access example using POSIX APIs\n&quot;</span>);
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diff changeset 
   213
 
<a name="l00287"></a>00287
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<a name="l00288"></a>00288         <span class="comment">// Print the message to start the example application.</span>
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<a name="l00289"></a>00289         printf(<span class="stringliteral">&quot;\n Press enter key to step through the example\n&quot;</span>);
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<a name="l00290"></a>00290         PressAKey();
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<a name="l00291"></a>00291
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<a name="l00292"></a>00292         <span class="comment">// Call CreateASecureDirectory() function to create a secure directory for the program.</span>
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<a name="l00293"></a>00293         CreateASecureDirectory();
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<a name="l00294"></a>00294
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<a name="l00295"></a>00295         <span class="comment">// Call WriteDataToAFile() function to write data in to a file from the created directory.</span>
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<a name="l00296"></a>00296         WriteDataToAFile(ownFileName);
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<a name="l00297"></a>00297
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<a name="l00298"></a>00298         <span class="comment">// Call WriteDataToAFile() function to write data in to a file from the created directory.</span>
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<a name="l00299"></a>00299         ReadDataFromAFile(ownFileName);
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<a name="l00300"></a>00300
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<a name="l00301"></a>00301         <span class="comment">// Call RemoveADirectory() function to remove the directory.</span>
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<a name="l00302"></a>00302         RemoveADirectory(ownFileName);
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<a name="l00303"></a>00303
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<a name="l00304"></a>00304         <span class="comment">// Call WriteDataToFileOfAnotherProgram() function to write data in to a file of another program.</span>
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<a name="l00305"></a>00305         WriteDataToFileOfAnotherProgram(otherFileName);
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<a name="l00306"></a>00306
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<a name="l00307"></a>00307         <span class="comment">// Call ReadDataFromFileOfAnotherProgram() function to read data from a file of another program.</span>
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<a name="l00308"></a>00308         ReadDataFromFileOfAnotherProgram(otherFileName);
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<a name="l00309"></a>00309
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<a name="l00310"></a>00310         <span class="comment">// Call WriteDataToFileOfSysBin() function to write data in to a file of sys/bin directory.</span>
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<a name="l00311"></a>00311         WriteDataToFileOfSysBin(sysBinFileName);
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<a name="l00312"></a>00312
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<a name="l00313"></a>00313         <span class="comment">// Call ReadDataFromFileOfSysBin() function to read data from a file in the sys/bin directory.</span>
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<a name="l00314"></a>00314         ReadDataToFileOfSysBin(sysBinFileName);
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<a name="l00315"></a>00315
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<a name="l00316"></a>00316         <span class="comment">// Print the message to exit from the example application.</span>
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<a name="l00317"></a>00317         printf(<span class="stringliteral">&quot;\n Press enter key to exit from the example application&quot;</span>);
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<a name="l00318"></a>00318         PressAKey();
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<a name="l00319"></a>00319
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<a name="l00320"></a>00320         <span class="comment">// returns the success code.</span>
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<a name="l00321"></a>00321         <span class="keywordflow">return</span> EXIT_SUCCESS;
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<a name="l00322"></a>00322 }
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<a name="l00323"></a>00323
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<a name="l00324"></a>00324
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
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