KeosDynLib.cpp

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/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA, or go to
 * http://www.gnu.org/copyleft/lesser.txt.
 *
 */

#include "KeosDynLib.h"
#include "KeosException.h"
#include "KeosLogger.h"

#if KEOS_PLATFORM == KEOS_PLATFORM_WIN32
#   define WIN32_LEAN_AND_MEAN
#   include <windows.h>
#endif

namespace Keos
{
  //=======================================================================
  // CDynLib implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  CDynLib::CDynLib( const String& strName )
  {
    m_strName = strName;
    m_hInst = NULL;
  }

  //-----------------------------------------------------------------------
  CDynLib::~CDynLib()
  {}

  //-----------------------------------------------------------------------
  void CDynLib::Load()
  {
    // Log library load
    ILogger::Log("Loading library %s", m_strName.c_str());

    String strName = m_strName;
#if KEOS_PLATFORM == KEOS_PLATFORM_LINUX
    // dlopen() does not add .so to the filename, like windows does for .dll
    if (strName.substr(strName.length() - 3, 3) != ".so")
      strName += ".so";
#endif
    m_hInst = (DYNLIB_HANDLE)DYNLIB_LOAD( strName.c_str() );

    if ( !m_hInst )
    {
      DYNLIB_EXCEPT(m_strName,
                    "Could not load dynamic library " + m_strName +  "\nSystem Error: " + DynlibError(),
                    "CDynLib::Load");
    }
  }

  //-----------------------------------------------------------------------
  void CDynLib::Unload()
  {
    // Log library load
    ILogger::Log("Unloading library %s", m_strName.c_str());

    if ( DYNLIB_UNLOAD( m_hInst ) )
    {
      DYNLIB_EXCEPT(m_strName,
                    "Could not unload dynamic library " + m_strName +  "\nSystem Error: " + DynlibError(),
                    "CDynLib::Unload");
    }
  }

  //-----------------------------------------------------------------------
  void* CDynLib::GetSymbol( const String& strName ) const throw()
  {
    return (void*)DYNLIB_GETSYM( m_hInst, strName.c_str() );
  }

  //-----------------------------------------------------------------------
  String CDynLib::DynlibError( void )
  {
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
    LPVOID lpMsgBuf;
    FormatMessage(
      FORMAT_MESSAGE_ALLOCATE_BUFFER |
      FORMAT_MESSAGE_FROM_SYSTEM |
      FORMAT_MESSAGE_IGNORE_INSERTS,
      NULL,
      GetLastError(),
      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
      (LPTSTR) &lpMsgBuf,
      0,
      NULL
    );
    String ret = (char*)lpMsgBuf;
    // Free the buffer.
    LocalFree( lpMsgBuf );
    return ret;
#elif OGRE_PLATFORM == OGRE_PLATFORM_LINUX
    return String(dlerror());
#elif OGRE_PLATFORM == OGRE_PLATFORM_APPLE
    return String(mac_errorBundle());
#else
    return String("");
#endif
  }
} // namespace Keos

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