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cplgetsymbol.cpp

00001 /******************************************************************************
00002  * $Id: cplgetsymbol_cpp-source.html,v 1.5 2000/11/06 04:49:01 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 1.5  2000/11/06 04:49:01  warmerda
00030  * *** empty log message ***
00030  *
00031  * Revision 1.9  2000/09/25 19:59:03  warmerda
00032  * look for WIN32 not _WIN32
00033  *
00034  * Revision 1.8  1999/05/20 02:54:38  warmerda
00035  * Added API documentation
00036  *
00037  * Revision 1.7  1999/04/23 13:56:36  warmerda
00038  * added stub implementation.  Don't check for __unix__
00039  *
00040  * Revision 1.6  1999/04/21 20:06:05  warmerda
00041  * Removed incorrect comment.
00042  *
00043  * Revision 1.5  1999/03/02 21:20:00  warmerda
00044  * test for dlfcn.h, not -ldl
00045  *
00046  * Revision 1.4  1999/03/02 21:08:11  warmerda
00047  * autoconf switch
00048  *
00049  * Revision 1.3  1999/01/28 18:35:44  warmerda
00050  * minor windows cleanup.
00051  *
00052  * Revision 1.2  1999/01/27 20:16:03  warmerda
00053  * Added windows implementation.
00054  *
00055  * Revision 1.1  1999/01/11 15:34:57  warmerda
00056  * New
00057  *
00058  */
00059 
00060 #include "cpl_conv.h"
00061 
00062 /* ==================================================================== */
00063 /*                  Unix Implementation                                 */
00064 /* ==================================================================== */
00065 #if defined(HAVE_DLFCN_H)
00066 
00067 #define GOT_GETSYMBOL
00068 
00069 #include <dlfcn.h>
00070 
00071 /************************************************************************/
00072 /*                            CPLGetSymbol()                            */
00073 /************************************************************************/
00074 
00108 void *CPLGetSymbol( const char * pszLibrary, const char * pszSymbolName )
00109 
00110 {
00111     void        *pLibrary;
00112     void        *pSymbol;
00113 
00114     pLibrary = dlopen(pszLibrary, RTLD_LAZY);
00115     if( pLibrary == NULL )
00116     {
00117         CPLError( CE_Failure, CPLE_AppDefined,
00118                   "%s", dlerror() );
00119         return NULL;
00120     }
00121 
00122     pSymbol = dlsym( pLibrary, pszSymbolName );
00123 
00124     if( pSymbol == NULL )
00125     {
00126         CPLError( CE_Failure, CPLE_AppDefined,
00127                   "%s", dlerror() );
00128         return NULL;
00129     }
00130     
00131     return( pSymbol );
00132 }
00133 
00134 #endif /* def __unix__ && defined(HAVE_DLFCN_H) */
00135 
00136 /* ==================================================================== */
00137 /*                 Windows Implementation                               */
00138 /* ==================================================================== */
00139 #ifdef WIN32
00140 
00141 #define GOT_GETSYMBOL
00142 
00143 #include <windows.h>
00144 
00145 /************************************************************************/
00146 /*                            CPLGetSymbol()                            */
00147 /************************************************************************/
00148 
00149 void *CPLGetSymbol( const char * pszLibrary, const char * pszSymbolName )
00150 
00151 {
00152     void        *pLibrary;
00153     void        *pSymbol;
00154 
00155     pLibrary = LoadLibrary(pszLibrary);
00156     if( pLibrary == NULL )
00157     {
00158         CPLError( CE_Failure, CPLE_AppDefined,
00159                   "Can't load requested DLL: %s", pszLibrary );
00160         return NULL;
00161     }
00162 
00163     pSymbol = GetProcAddress( (HINSTANCE) pLibrary, pszSymbolName );
00164 
00165     if( pSymbol == NULL )
00166     {
00167         CPLError( CE_Failure, CPLE_AppDefined,
00168                   "Can't find requested entry point: %s\n", pszSymbolName );
00169         return NULL;
00170     }
00171     
00172     return( pSymbol );
00173 }
00174 
00175 #endif /* def _WIN32 */
00176 
00177 /* ==================================================================== */
00178 /*      Dummy implementation.                                           */
00179 /* ==================================================================== */
00180 
00181 #ifndef GOT_GETSYMBOL
00182 
00183 /************************************************************************/
00184 /*                            CPLGetSymbol()                            */
00185 /*                                                                      */
00186 /*      Dummy implementation.                                           */
00187 /************************************************************************/
00188 
00189 void *CPLGetSymbol(const char *, const char *)
00190 
00191 {
00192     return NULL;
00193 }
00194 #endif

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