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