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<hr><h1>cplgetsymbol.cpp</h1><div class="fragment"><pre>00001 <font class="comment">/******************************************************************************</font>
00002 <font class="comment"> * $Id: cplgetsymbol_cpp-source.html,v 1.10 2002/04/16 13:11:48 warmerda Exp $</font>
00003 <font class="comment"> *</font>
00004 <font class="comment"> * Project: Common Portability Library</font>
00005 <font class="comment"> * Purpose: Fetch a function pointer from a shared library / DLL.</font>
00006 <font class="comment"> * Author: Frank Warmerdam, warmerda@home.com</font>
00007 <font class="comment"> *</font>
00008 <font class="comment"> ******************************************************************************</font>
00009 <font class="comment"> * Copyright (c) 1999, Frank Warmerdam</font>
00010 <font class="comment"> *</font>
00011 <font class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</font>
00012 <font class="comment"> * copy of this software and associated documentation files (the "Software"),</font>
00013 <font class="comment"> * to deal in the Software without restriction, including without limitation</font>
00014 <font class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</font>
00015 <font class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</font>
00016 <font class="comment"> * Software is furnished to do so, subject to the following conditions:</font>
00017 <font class="comment"> *</font>
00018 <font class="comment"> * The above copyright notice and this permission notice shall be included</font>
00019 <font class="comment"> * in all copies or substantial portions of the Software.</font>
00020 <font class="comment"> *</font>
00021 <font class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS</font>
00022 <font class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</font>
00023 <font class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</font>
00024 <font class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</font>
00025 <font class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</font>
00026 <font class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</font>
00027 <font class="comment"> * DEALINGS IN THE SOFTWARE.</font>
00028 <font class="comment"> ******************************************************************************</font>
00029 <font class="comment"> *</font>
00030 <font class="comment"> * $Log: cplgetsymbol_cpp-source.html,v $
00030 <font class="comment"> * Revision 1.10 2002/04/16 13:11:48 warmerda
00030 <font class="comment"> * updated
00030 <font class="comment"> *</font>
00031 <font class="comment"> * Revision 1.11 2001/07/18 04:00:49 warmerda</font>
00032 <font class="comment"> * added CPL_CVSID</font>
00033 <font class="comment"> *</font>
00034 <font class="comment"> * Revision 1.10 2001/01/19 21:16:41 warmerda</font>
00035 <font class="comment"> * expanded tabs</font>
00036 <font class="comment"> *</font>
00037 <font class="comment"> * Revision 1.9 2000/09/25 19:59:03 warmerda</font>
00038 <font class="comment"> * look for WIN32 not _WIN32</font>
00039 <font class="comment"> *</font>
00040 <font class="comment"> * Revision 1.8 1999/05/20 02:54:38 warmerda</font>
00041 <font class="comment"> * Added API documentation</font>
00042 <font class="comment"> *</font>
00043 <font class="comment"> * Revision 1.7 1999/04/23 13:56:36 warmerda</font>
00044 <font class="comment"> * added stub implementation. Don't check for __unix__</font>
00045 <font class="comment"> *</font>
00046 <font class="comment"> * Revision 1.6 1999/04/21 20:06:05 warmerda</font>
00047 <font class="comment"> * Removed incorrect comment.</font>
00048 <font class="comment"> *</font>
00049 <font class="comment"> * Revision 1.5 1999/03/02 21:20:00 warmerda</font>
00050 <font class="comment"> * test for dlfcn.h, not -ldl</font>
00051 <font class="comment"> *</font>
00052 <font class="comment"> * Revision 1.4 1999/03/02 21:08:11 warmerda</font>
00053 <font class="comment"> * autoconf switch</font>
00054 <font class="comment"> *</font>
00055 <font class="comment"> * Revision 1.3 1999/01/28 18:35:44 warmerda</font>
00056 <font class="comment"> * minor windows cleanup.</font>
00057 <font class="comment"> *</font>
00058 <font class="comment"> * Revision 1.2 1999/01/27 20:16:03 warmerda</font>
00059 <font class="comment"> * Added windows implementation.</font>
00060 <font class="comment"> *</font>
00061 <font class="comment"> * Revision 1.1 1999/01/11 15:34:57 warmerda</font>
00062 <font class="comment"> * New</font>
00063 <font class="comment"> *</font>
00064 <font class="comment"> */</font>
00065
00066 <font class="preprocessor">#include "<a class="code" href="cpl_conv_h.html">cpl_conv.h</a>"</font>
00067
00068 CPL_CVSID(<font class="stringliteral">"$Id: cplgetsymbol_cpp-source.html,v 1.10 2002/04/16 13:11:48 warmerda Exp $"</font>);
00069
00070 <font class="comment">/* ==================================================================== */</font>
00071 <font class="comment">/* Unix Implementation */</font>
00072 <font class="comment">/* ==================================================================== */</font>
00073 <font class="preprocessor">#if defined(HAVE_DLFCN_H)</font>
00074 <font class="preprocessor"></font>
00075 <font class="preprocessor">#define GOT_GETSYMBOL</font>
00076 <font class="preprocessor"></font>
00077 <font class="preprocessor">#include <dlfcn.h></font>
00078
00079 <font class="comment">/************************************************************************/</font>
00080 <font class="comment">/* CPLGetSymbol() */</font>
00081 <font class="comment">/************************************************************************/</font>
00082
00116 <font class="keywordtype">void</font> *<a class="code" href="cpl_conv_h.html#a8">CPLGetSymbol</a>( <font class="keyword">const</font> <font class="keywordtype">char</font> * pszLibrary, <font class="keyword">const</font> <font class="keywordtype">char</font> * pszSymbolName )<font class="keyword"></font>
00117 <font class="keyword"></font>
00118 <font class="keyword"></font>{
00119 <font class="keywordtype">void</font> *pLibrary;
00120 <font class="keywordtype">void</font> *pSymbol;
00121
00122 pLibrary = dlopen(pszLibrary, RTLD_LAZY);
00123 <font class="keywordflow">if</font>( pLibrary == NULL )
00124 {
00125 <a class="code" href="cpl_error_h.html#a17">CPLError</a>( CE_Failure, CPLE_AppDefined,
00126 <font class="stringliteral">"%s"</font>, dlerror() );
00127 <font class="keywordflow">return</font> NULL;
00128 }
00129
00130 pSymbol = dlsym( pLibrary, pszSymbolName );
00131
00132 <font class="keywordflow">if</font>( pSymbol == NULL )
00133 {
00134 <a class="code" href="cpl_error_h.html#a17">CPLError</a>( CE_Failure, CPLE_AppDefined,
00135 <font class="stringliteral">"%s"</font>, dlerror() );
00136 <font class="keywordflow">return</font> NULL;
00137 }
00138
00139 <font class="keywordflow">return</font>( pSymbol );
00140 }
00141
00142 <font class="preprocessor">#endif </font><font class="comment">/* def __unix__ && defined(HAVE_DLFCN_H) */</font>
00143
00144 <font class="comment">/* ==================================================================== */</font>
00145 <font class="comment">/* Windows Implementation */</font>
00146 <font class="comment">/* ==================================================================== */</font>
00147 <font class="preprocessor">#ifdef WIN32</font>
00148 <font class="preprocessor"></font>
00149 <font class="preprocessor">#define GOT_GETSYMBOL</font>
00150 <font class="preprocessor"></font>
00151 <font class="preprocessor">#include <windows.h></font>
00152
00153 <font class="comment">/************************************************************************/</font>
00154 <font class="comment">/* CPLGetSymbol() */</font>
00155 <font class="comment">/************************************************************************/</font>
00156
00157 <font class="keywordtype">void</font> *<a class="code" href="cpl_conv_h.html#a8">CPLGetSymbol</a>( <font class="keyword">const</font> <font class="keywordtype">char</font> * pszLibrary, <font class="keyword">const</font> <font class="keywordtype">char</font> * pszSymbolName )<font class="keyword"></font>
00158 <font class="keyword"></font>
00159 <font class="keyword"></font>{
00160 <font class="keywordtype">void</font> *pLibrary;
00161 <font class="keywordtype">void</font> *pSymbol;
00162
00163 pLibrary = LoadLibrary(pszLibrary);
00164 <font class="keywordflow">if</font>( pLibrary == NULL )
00165 {
00166 <a class="code" href="cpl_error_h.html#a17">CPLError</a>( CE_Failure, CPLE_AppDefined,
00167 <font class="stringliteral">"Can't load requested DLL: %s"</font>, pszLibrary );
00168 <font class="keywordflow">return</font> NULL;
00169 }
00170
00171 pSymbol = GetProcAddress( (HINSTANCE) pLibrary, pszSymbolName );
00172
00173 <font class="keywordflow">if</font>( pSymbol == NULL )
00174 {
00175 <a class="code" href="cpl_error_h.html#a17">CPLError</a>( CE_Failure, CPLE_AppDefined,
00176 <font class="stringliteral">"Can't find requested entry point: %s\n"</font>, pszSymbolName );
00177 <font class="keywordflow">return</font> NULL;
00178 }
00179
00180 <font class="keywordflow">return</font>( pSymbol );
00181 }
00182
00183 <font class="preprocessor">#endif </font><font class="comment">/* def _WIN32 */</font>
00184
00185 <font class="comment">/* ==================================================================== */</font>
00186 <font class="comment">/* Dummy implementation. */</font>
00187 <font class="comment">/* ==================================================================== */</font>
00188
00189 <font class="preprocessor">#ifndef GOT_GETSYMBOL</font>
00190 <font class="preprocessor"></font>
00191 <font class="comment">/************************************************************************/</font>
00192 <font class="comment">/* CPLGetSymbol() */</font>
00193 <font class="comment">/* */</font>
00194 <font class="comment">/* Dummy implementation. */</font>
00195 <font class="comment">/************************************************************************/</font>
00196
00197 <font class="keywordtype">void</font> *<a class="code" href="cpl_conv_h.html#a8">CPLGetSymbol</a>(<font class="keyword">const</font> <font class="keywordtype">char</font> *, <font class="keyword">const</font> <font class="keywordtype">char</font> *)<font class="keyword"></font>
00198 <font class="keyword"></font>
00199 <font class="keyword"></font>{
00200 <font class="keywordflow">return</font> NULL;
00201 }
00202 <font class="preprocessor">#endif</font>
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