DynLibLoaderWin.cxx

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// Copyright (C) 2006-2025  CEA, EDF
//
// This library 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 2.1 of the License, or (at your option) any later version.
//
// This library 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
 
#include "DynLibLoaderWin.hxx"
#include <iostream>
#include <Windows.h>
 
using namespace YACS::BASES;
 
const char DynLibLoaderWin::_extForDynLib[]=".dll";
 
DynLibLoaderWin::DynLibLoaderWin(const std::string& libNameWithoutExtension):_libName(libNameWithoutExtension),
                                                                             _handleOnLoadedLib(0)
{
}
 
DynLibLoaderWin::~DynLibLoaderWin()
{
  if(_handleOnLoadedLib)
    FreeLibrary(_handleOnLoadedLib);
}
 
bool DynLibLoaderWin::isLibFileFindable() const
{
  return true;
}
 
std::string DynLibLoaderWin::getLibNameWithoutExt() const
{
  return _libName;
}
 
int DynLibLoaderWin::appendDirInSearchPath(const std::string& dirName)
{
  return 0;
}
 
int DynLibLoaderWin::removeDirInSearchPath(const std::string& dirName)
{
  return 0;
}
 
void *DynLibLoaderWin::getHandleOnSymbolWithName(const std::string& symbName, bool stopOnError)
{
  if(!_handleOnLoadedLib)
    if(!isLibFileFindable())
      {
        std::cerr << "Dynamic library with name " << symbName << _extForDynLib;
        std::cerr << " not existing in paths specified" << std::endl;
        return 0;
      }
    else
      loadLib();
  return resolveSymb(symbName, stopOnError);
}
 
bool DynLibLoaderWin::load()
{
  std::string fullLibName(_libName);
  fullLibName+=_extForDynLib;
#if defined(UNICODE) && defined(WIN32)
  size_t length = strlen(fullLibName.c_str()) + sizeof(char);
  wchar_t* aPath = new wchar_t[length + 1];
  memset(aPath, '\0', length);
  mbstowcs(aPath, fullLibName.c_str(), length);
#else
  const char* aPath = fullLibName.c_str();
#endif
 
  _handleOnLoadedLib=LoadLibrary(aPath);
  return _handleOnLoadedLib != NULL;
}
 
bool DynLibLoaderWin::unload()
{
  if (_handleOnLoadedLib) 
    {
      FreeLibrary(_handleOnLoadedLib);
      _handleOnLoadedLib = NULL;
    }
  return 0;
}
 
bool DynLibLoaderWin::reload()
{
  unload();
  return load();
}
 
void *DynLibLoaderWin::resolveSymb(const std::string& symbName, bool stopOnError)
{
  void *ret=(void*)GetProcAddress(_handleOnLoadedLib,symbName.c_str());
  char *message="Not available here !";
  if(stopOnError && (NULL != message))
    {
      std::cerr << "Error detected on symbol " << symbName << " search in library with name " << _libName << _extForDynLib;
      std::cerr << " with the following internal message"<<  std::endl; 
      std::cerr << message << std::endl;
      return 0;
    }
  else
    return ret;
}
 
const char *DynLibLoaderWin::getExtensionForDynLib()
{
  return _extForDynLib+1;
}