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3 <title>TB10.1 Example Applications: examples/PIPS/HelloWorldExample/src/helloworldexeexample/helloworldexeexample.c Source File</title> |
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8 <h1>examples/PIPS/HelloWorldExample/src/helloworldexeexample/helloworldexeexample.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// helloworldexeexample.c</span> |
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9 <a name="l00002"></a>00002 <span class="comment">//</span> |
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10 <a name="l00003"></a>00003 <span class="comment">// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).</span> |
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11 <a name="l00004"></a>00004 <span class="comment">// All rights reserved.</span> |
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12 <a name="l00005"></a>00005 <span class="comment">// This component and the accompanying materials are made available</span> |
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13 <a name="l00006"></a>00006 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span> |
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14 <a name="l00007"></a>00007 <span class="comment">// which accompanies this distribution, and is available</span> |
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15 <a name="l00008"></a>00008 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span> |
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16 <a name="l00009"></a>00009 <span class="comment">//</span> |
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17 <a name="l00010"></a>00010 <span class="comment">// Initial Contributors:</span> |
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18 <a name="l00011"></a>00011 <span class="comment">// Nokia Corporation - initial contribution.</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">// Contributors:</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 <span class="comment">// Description:</span> |
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23 <a name="l00016"></a>00016 <span class="comment">//</span> |
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24 <a name="l00017"></a>00017 |
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25 <a name="l00018"></a>00018 |
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26 <a name="l00019"></a>00019 <span class="comment">/* This example is a simple PIPS STDEXE application. It loads the DLL and calls its exported function. </span> |
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27 <a name="l00020"></a>00020 <span class="comment">The application implements the dynamic lookup by name mechanism of the exported function using the libdl APIs.</span> |
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28 <a name="l00021"></a>00021 <span class="comment">*/</span> |
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29 <a name="l00022"></a>00022 |
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30 <a name="l00023"></a>00023 <span class="comment">// Include files.</span> |
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31 <a name="l00024"></a>00024 <span class="preprocessor">#include <stdio.h></span> |
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32 <a name="l00025"></a>00025 <span class="preprocessor">#include <dlfcn.h></span> |
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33 <a name="l00026"></a>00026 <span class="preprocessor">#include <stdlib.h></span> |
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34 <a name="l00027"></a>00027 |
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35 <a name="l00031"></a>00031 <span class="keywordtype">void</span> PressAKey() |
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36 <a name="l00032"></a>00032 { |
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37 <a name="l00033"></a>00033 fflush(stdout); |
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38 <a name="l00034"></a>00034 getchar(); |
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39 <a name="l00035"></a>00035 } |
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40 <a name="l00040"></a>00040 <span class="keywordtype">int</span> DisplayErrorMessage() |
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41 <a name="l00041"></a>00041 { |
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42 <a name="l00042"></a>00042 <span class="comment">// Obtain the last error occurred using the libdl API, dlerror().</span> |
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43 <a name="l00043"></a>00043 <span class="keyword">const</span> <span class="keywordtype">char</span> *q = dlerror(); |
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44 <a name="l00044"></a>00044 |
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45 <a name="l00045"></a>00045 <span class="comment">// Prints the error message.</span> |
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46 <a name="l00046"></a>00046 printf(<span class="stringliteral">"%s"</span>,q); |
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47 <a name="l00047"></a>00047 PressAKey(); |
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48 <a name="l00048"></a>00048 |
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49 <a name="l00049"></a>00049 <span class="comment">// returns the failure code.</span> |
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50 <a name="l00050"></a>00050 <span class="keywordflow">return</span> EXIT_FAILURE; |
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51 <a name="l00051"></a>00051 } |
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52 <a name="l00052"></a>00052 |
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53 <a name="l00053"></a>00053 <span class="keywordtype">int</span> main() |
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54 <a name="l00054"></a>00054 { |
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55 <a name="l00055"></a>00055 <span class="keywordtype">int</span> result; |
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56 <a name="l00056"></a>00056 |
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57 <a name="l00057"></a>00057 <span class="comment">// Handle to load the dynamic library.</span> |
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58 <a name="l00058"></a>00058 <span class="keywordtype">void</span>* handleToDll; |
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59 <a name="l00059"></a>00059 |
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60 <a name="l00060"></a>00060 <span class="keyword">typedef</span> void (*PrintHelloWorldFunction)(void); |
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61 <a name="l00061"></a>00061 PrintHelloWorldFunction PrintHelloWorld; |
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62 <a name="l00062"></a>00062 |
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63 <a name="l00063"></a>00063 <span class="comment">// Contains name of the DLL file.</span> |
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64 <a name="l00064"></a>00064 <span class="keywordtype">char</span> dllFileName[] = <span class="stringliteral">"helloworlddllexample.dll"</span>; |
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65 <a name="l00065"></a>00065 |
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66 <a name="l00071"></a>00071 handleToDll = dlopen(dllFileName, RTLD_LAZY); |
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67 <a name="l00072"></a>00072 |
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68 <a name="l00073"></a>00073 <span class="comment">// Check the descriptor value.If it is null, the error message is printed.</span> |
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69 <a name="l00074"></a>00074 <span class="keywordflow">if</span> (!handleToDll) |
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70 <a name="l00075"></a>00075 { |
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71 <a name="l00076"></a>00076 DisplayErrorMessage(); |
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72 <a name="l00077"></a>00077 } |
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73 <a name="l00078"></a>00078 |
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74 <a name="l00079"></a>00079 <span class="comment">// Print the message to start the example application.</span> |
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75 <a name="l00080"></a>00080 printf(<span class="stringliteral">" Press enter key to step through the example application\n"</span>); |
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76 <a name="l00081"></a>00081 PressAKey(); |
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77 <a name="l00082"></a>00082 |
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78 <a name="l00088"></a>00088 PrintHelloWorld = (PrintHelloWorldFunction)dlsym(handleToDll, <span class="stringliteral">"PrintHelloWorld"</span>); |
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79 <a name="l00089"></a>00089 |
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80 <a name="l00090"></a>00090 <span class="comment">// Check the symbol address value. If this is null, the error message is printed.</span> |
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81 <a name="l00091"></a>00091 <span class="keywordflow">if</span>(!PrintHelloWorld) |
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82 <a name="l00092"></a>00092 { |
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83 <a name="l00093"></a>00093 DisplayErrorMessage(); |
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84 <a name="l00094"></a>00094 } |
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85 <a name="l00095"></a>00095 |
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86 <a name="l00096"></a>00096 <span class="comment">// Call the loaded DLL's exported function.</span> |
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87 <a name="l00097"></a>00097 PrintHelloWorld(); |
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88 <a name="l00098"></a>00098 |
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89 <a name="l00105"></a>00105 result= dlclose(handleToDll); |
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90 <a name="l00106"></a>00106 |
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91 <a name="l00107"></a>00107 <span class="comment">// Check the return value. If this is -1, the error message is printed.</span> |
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92 <a name="l00108"></a>00108 <span class="keywordflow">if</span>(result == -1) |
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93 <a name="l00109"></a>00109 { |
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94 <a name="l00110"></a>00110 DisplayErrorMessage(); |
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95 <a name="l00111"></a>00111 } |
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96 <a name="l00112"></a>00112 |
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97 <a name="l00113"></a>00113 <span class="comment">// Print the message to exit from the example application.</span> |
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98 <a name="l00114"></a>00114 printf(<span class="stringliteral">" Press enter key to exit from the example application"</span>); |
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99 <a name="l00115"></a>00115 PressAKey(); |
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100 <a name="l00116"></a>00116 |
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101 <a name="l00117"></a>00117 <span class="comment">// returns the success code.</span> |
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102 <a name="l00118"></a>00118 <span class="keywordflow">return</span> EXIT_SUCCESS; |
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103 <a name="l00119"></a>00119 } |
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104 <a name="l00120"></a>00120 |
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105 <a name="l00121"></a>00121 |
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106 <a name="l00122"></a>00122 |
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107 </pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Thu Jan 21 10:33:00 2010 for TB10.1 Example Applications by |
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109 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.3 </small></address> |
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