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/******************************************************************************
* $Id: gbgetsymbol.cpp,v 1.3 2001/09/06 14:03:21 warmerda Exp $
*
* Project: GDAL Bridge
* Purpose: Fetch a function pointer from a shared library / DLL.
* Author: Frank Warmerdam, warmerda@home.com
*
* Adapted from cplgetsymbol.cpp.
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************
*
* $Log: gbgetsymbol.cpp,v $
* Revision 1.3 2001/09/06 14:03:21 warmerda
* upgrade bridge error reporting
*
* Revision 1.2 2000/09/27 13:22:07 warmerda
* also allow for unix in check
*
* Revision 1.1 1999/04/21 23:01:31 warmerda
* New
*
*/
#include <stdio.h>
#include "gdalbridge.h"
/* ==================================================================== */
/* Unix Implementation */
/* ==================================================================== */
#if defined(__unix__) || defined(unix)
#include <dlfcn.h>
/************************************************************************/
/* GBGetSymbol() */
/* */
/* Note that this function doesn't: */
/* o prevent the reference count on the library from going up */
/* for every request, or given any opportunity to unload */
/* the library. */
/* o Attempt to look for the library in non-standard */
/* locations. */
/* o Attempt to try variations on the symbol name, like */
/* pre-prending or post-pending an underscore. */
/************************************************************************/
void *GBGetSymbol( const char * pszLibrary, const char * pszSymbolName )
{
void *pLibrary;
void *pSymbol;
pLibrary = dlopen(pszLibrary, RTLD_LAZY);
if( pLibrary == NULL )
{
return NULL;
}
pSymbol = dlsym( pLibrary, pszSymbolName );
if( pSymbol == NULL )
{
fprintf( stderr, "GBGetSymbol(): %s\n", dlerror() );
return NULL;
}
return( pSymbol );
}
#endif /* def __unix__ && defined(HAVE_DLFCN_H) */
/* ==================================================================== */
/* Windows Implementation */
/* ==================================================================== */
#ifdef _WIN32
#include <windows.h>
/************************************************************************/
/* GBGetSymbol() */
/* */
/* Note that this function doesn't: */
/* o prevent the reference count on the library from going up */
/* for every request, or given any opportunity to unload */
/* the library. */
/* o Attempt to look for the library in non-standard */
/* locations. */
/* o Attempt to try variations on the symbol name, like */
/* pre-prending or post-pending an underscore. */
/************************************************************************/
void *GBGetSymbol( const char * pszLibrary, const char * pszSymbolName )
{
void *pLibrary;
void *pSymbol;
pLibrary = LoadLibrary(pszLibrary);
if( pLibrary == NULL )
{
return NULL;
}
pSymbol = GetProcAddress( (HINSTANCE) pLibrary, pszSymbolName );
if( pSymbol == NULL )
{
fprintf( stderr,
"GBGetSymbol(): Can't find requested entry point: %s\n",
pszSymbolName );
return NULL;
}
return( pSymbol );
}
#endif /* def _WIN32 */
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