00001 /****************************************************************************** 00002 * $Id: cplgetsymbol_cpp-source.html,v 1.1 2000/09/25 20:50:11 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 1.1 2000/09/25 20:50:11 warmerda 00030 * New 00030 * 00031 * Revision 1.8 1999/05/20 02:54:38 warmerda 00032 * Added API documentation 00033 * 00034 * Revision 1.7 1999/04/23 13:56:36 warmerda 00035 * added stub implementation. Don't check for __unix__ 00036 * 00037 * Revision 1.6 1999/04/21 20:06:05 warmerda 00038 * Removed incorrect comment. 00039 * 00040 * Revision 1.5 1999/03/02 21:20:00 warmerda 00041 * test for dlfcn.h, not -ldl 00042 * 00043 * Revision 1.4 1999/03/02 21:08:11 warmerda 00044 * autoconf switch 00045 * 00046 * Revision 1.3 1999/01/28 18:35:44 warmerda 00047 * minor windows cleanup. 00048 * 00049 * Revision 1.2 1999/01/27 20:16:03 warmerda 00050 * Added windows implementation. 00051 * 00052 * Revision 1.1 1999/01/11 15:34:57 warmerda 00053 * New 00054 * 00055 */ 00056 00057 #include "cpl_conv.h" 00058 00059 /* ==================================================================== */ 00060 /* Unix Implementation */ 00061 /* ==================================================================== */ 00062 #if defined(HAVE_DLFCN_H) 00063 00064 #define GOT_GETSYMBOL 00065 00066 #include <dlfcn.h> 00067 00068 /************************************************************************/ 00069 /* CPLGetSymbol() */ 00070 /************************************************************************/ 00071 00105 void *CPLGetSymbol( const char * pszLibrary, const char * pszSymbolName ) 00106 00107 { 00108 void *pLibrary; 00109 void *pSymbol; 00110 00111 pLibrary = dlopen(pszLibrary, RTLD_LAZY); 00112 if( pLibrary == NULL ) 00113 { 00114 CPLError( CE_Failure, CPLE_AppDefined, 00115 "%s", dlerror() ); 00116 return NULL; 00117 } 00118 00119 pSymbol = dlsym( pLibrary, pszSymbolName ); 00120 00121 if( pSymbol == NULL ) 00122 { 00123 CPLError( CE_Failure, CPLE_AppDefined, 00124 "%s", dlerror() ); 00125 return NULL; 00126 } 00127 00128 return( pSymbol ); 00129 } 00130 00131 #endif /* def __unix__ && defined(HAVE_DLFCN_H) */ 00132 00133 /* ==================================================================== */ 00134 /* Windows Implementation */ 00135 /* ==================================================================== */ 00136 #ifdef _WIN32 00137 00138 #define GOT_GETSYMBOL 00139 00140 #include <windows.h> 00141 00142 /************************************************************************/ 00143 /* CPLGetSymbol() */ 00144 /************************************************************************/ 00145 00146 void *CPLGetSymbol( const char * pszLibrary, const char * pszSymbolName ) 00147 00148 { 00149 void *pLibrary; 00150 void *pSymbol; 00151 00152 pLibrary = LoadLibrary(pszLibrary); 00153 if( pLibrary == NULL ) 00154 { 00155 CPLError( CE_Failure, CPLE_AppDefined, 00156 "Can't load requested DLL: %s", pszLibrary ); 00157 return NULL; 00158 } 00159 00160 pSymbol = GetProcAddress( (HINSTANCE) pLibrary, pszSymbolName ); 00161 00162 if( pSymbol == NULL ) 00163 { 00164 CPLError( CE_Failure, CPLE_AppDefined, 00165 "Can't find requested entry point: %s\n", pszSymbolName ); 00166 return NULL; 00167 } 00168 00169 return( pSymbol ); 00170 } 00171 00172 #endif /* def _WIN32 */ 00173 00174 /* ==================================================================== */ 00175 /* Dummy implementation. */ 00176 /* ==================================================================== */ 00177 00178 #ifndef GOT_GETSYMBOL 00179 00180 /************************************************************************/ 00181 /* CPLGetSymbol() */ 00182 /* */ 00183 /* Dummy implementation. */ 00184 /************************************************************************/ 00185 00186 void *CPLGetSymbol(const char *, const char *) 00187 00188 { 00189 return NULL; 00190 } 00191 #endif