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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) 2008-2010 ZenJu (zhnmju123 AT gmx.de) *
// **************************************************************************
//
#include "dll_loader.h"
#include <wx/msw/wrapwin.h> //includes "windows.h"
#include <map>
#include <cassert>
namespace
{
class DllHandler //dynamically load "kernel32.dll"
{
public:
static DllHandler& getInstance()
{
static DllHandler instance;
return instance;
}
HINSTANCE getHandle(const std::wstring& libraryName)
{
HandleMap::const_iterator foundEntry = handles.find(libraryName);
if (foundEntry == handles.end())
{
HINSTANCE newHandle = ::LoadLibrary(libraryName.c_str());
if (newHandle != NULL)
handles.insert(std::make_pair(libraryName, newHandle));
return newHandle;
}
else
return foundEntry->second;
}
private:
DllHandler() {}
~DllHandler()
{
for (HandleMap::const_iterator i = handles.begin(); i != handles.end(); ++i)
::FreeLibrary(i->second);
}
typedef std::map<std::wstring, HINSTANCE> HandleMap;
HandleMap handles; //only valid handles here!
};
}
void* util::loadSymbol(const std::wstring& libraryName, const std::string& functionName)
{
const HINSTANCE libHandle = DllHandler::getInstance().getHandle(libraryName);
if (libHandle != NULL)
return reinterpret_cast<void*>(::GetProcAddress(libHandle, functionName.c_str()));
else
return NULL;
}
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