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cplgetsymbol.cpp

00001 /******************************************************************************
00002  * $Id: cplgetsymbol_cpp-source.html,v 1.8 2001/07/05 13:24:08 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 1.8  2001/07/05 13:24:08  warmerda
00030  * *** empty log message ***
00030  *
00031  * Revision 1.10  2001/01/19 21:16:41  warmerda
00032  * expanded tabs
00033  *
00034  * Revision 1.9  2000/09/25 19:59:03  warmerda
00035  * look for WIN32 not _WIN32
00036  *
00037  * Revision 1.8  1999/05/20 02:54:38  warmerda
00038  * Added API documentation
00039  *
00040  * Revision 1.7  1999/04/23 13:56:36  warmerda
00041  * added stub implementation.  Don't check for __unix__
00042  *
00043  * Revision 1.6  1999/04/21 20:06:05  warmerda
00044  * Removed incorrect comment.
00045  *
00046  * Revision 1.5  1999/03/02 21:20:00  warmerda
00047  * test for dlfcn.h, not -ldl
00048  *
00049  * Revision 1.4  1999/03/02 21:08:11  warmerda
00050  * autoconf switch
00051  *
00052  * Revision 1.3  1999/01/28 18:35:44  warmerda
00053  * minor windows cleanup.
00054  *
00055  * Revision 1.2  1999/01/27 20:16:03  warmerda
00056  * Added windows implementation.
00057  *
00058  * Revision 1.1  1999/01/11 15:34:57  warmerda
00059  * New
00060  *
00061  */
00062 
00063 #include "cpl_conv.h"
00064 
00065 /* ==================================================================== */
00066 /*                  Unix Implementation                                 */
00067 /* ==================================================================== */
00068 #if defined(HAVE_DLFCN_H)
00069 
00070 #define GOT_GETSYMBOL
00071 
00072 #include <dlfcn.h>
00073 
00074 /************************************************************************/
00075 /*                            CPLGetSymbol()                            */
00076 /************************************************************************/
00077 
00111 void *CPLGetSymbol( const char * pszLibrary, const char * pszSymbolName )
00112 
00113 {
00114     void        *pLibrary;
00115     void        *pSymbol;
00116 
00117     pLibrary = dlopen(pszLibrary, RTLD_LAZY);
00118     if( pLibrary == NULL )
00119     {
00120         CPLError( CE_Failure, CPLE_AppDefined,
00121                   "%s", dlerror() );
00122         return NULL;
00123     }
00124 
00125     pSymbol = dlsym( pLibrary, pszSymbolName );
00126 
00127     if( pSymbol == NULL )
00128     {
00129         CPLError( CE_Failure, CPLE_AppDefined,
00130                   "%s", dlerror() );
00131         return NULL;
00132     }
00133     
00134     return( pSymbol );
00135 }
00136 
00137 #endif /* def __unix__ && defined(HAVE_DLFCN_H) */
00138 
00139 /* ==================================================================== */
00140 /*                 Windows Implementation                               */
00141 /* ==================================================================== */
00142 #ifdef WIN32
00143 
00144 #define GOT_GETSYMBOL
00145 
00146 #include <windows.h>
00147 
00148 /************************************************************************/
00149 /*                            CPLGetSymbol()                            */
00150 /************************************************************************/
00151 
00152 void *CPLGetSymbol( const char * pszLibrary, const char * pszSymbolName )
00153 
00154 {
00155     void        *pLibrary;
00156     void        *pSymbol;
00157 
00158     pLibrary = LoadLibrary(pszLibrary);
00159     if( pLibrary == NULL )
00160     {
00161         CPLError( CE_Failure, CPLE_AppDefined,
00162                   "Can't load requested DLL: %s", pszLibrary );
00163         return NULL;
00164     }
00165 
00166     pSymbol = GetProcAddress( (HINSTANCE) pLibrary, pszSymbolName );
00167 
00168     if( pSymbol == NULL )
00169     {
00170         CPLError( CE_Failure, CPLE_AppDefined,
00171                   "Can't find requested entry point: %s\n", pszSymbolName );
00172         return NULL;
00173     }
00174     
00175     return( pSymbol );
00176 }
00177 
00178 #endif /* def _WIN32 */
00179 
00180 /* ==================================================================== */
00181 /*      Dummy implementation.                                           */
00182 /* ==================================================================== */
00183 
00184 #ifndef GOT_GETSYMBOL
00185 
00186 /************************************************************************/
00187 /*                            CPLGetSymbol()                            */
00188 /*                                                                      */
00189 /*      Dummy implementation.                                           */
00190 /************************************************************************/
00191 
00192 void *CPLGetSymbol(const char *, const char *)
00193 
00194 {
00195     return NULL;
00196 }
00197 #endif

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