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#ifndef _LOADPLUGIN_H_
#define _LOADPLUGIN_H_
 
 
#include<map>
//#include<helpers_s.h>
 
#ifdef _UNICODE
#define _tstring wstring
#else
#define _tstring string
#endif
 
typedef HRESULT (STDAPICALLTYPE *PDLLGETCLASSOBJECT)(const CLSID& clsid, const IID& iid, void** ppv);
 
class cLoadPlugin
{
public:
    cLoadPlugin()
    {
        m_plugins.clear();
        InitializeCriticalSection( &m_cs );
    }
    ~cLoadPlugin();
 
    bool LoadPlugin( const TCHAR* szDllPath , IID IInterface , void** pInterface );
 
 
 
 
private:
    HMODULE  GetModule( const TCHAR* szDllPath );
    _tstring& toLower( _tstring& sin );
    HMODULE isInList( _tstring& path );
    map<_tstring , HMODULE> m_plugins;
    CRITICAL_SECTION m_cs;
     
    void ecs()
    {
        EnterCriticalSection( &m_cs );
    }
    void lcs()
    {
        LeaveCriticalSection( &m_cs );
    }
};
 
 
 
cLoadPlugin::~cLoadPlugin()
{  
    map<_tstring , HMODULE>::iterator it;
 
    DeleteCriticalSection( &m_cs );
     
    for ( it=m_plugins.begin() ; it != m_plugins.end(); it++ )
    {
        FreeLibrary( (HMODULE)it->second );
    }
 
 
}
 
 
_tstring& cLoadPlugin::toLower( _tstring& sin )
{
    TCHAR cStart = L'A', cEnd=L'Z';
    for( unsigned int i=0; i < sin.length(); i++ )
    {
        if( sin[i] >= cStart && sin[i] <= cEnd )
        {
            sin[i] = sin[i]+32;
        }
 
    }
 
    return( sin );
}
 
HMODULE cLoadPlugin::isInList( _tstring& path )
{
    map<_tstring , HMODULE>::iterator it;
     
    it = m_plugins.find( path );
    if( it == m_plugins.end() )
        return( NULL );
    return( it->second );
}
 
bool cLoadPlugin::LoadPlugin( const TCHAR* szDllPath , IID IInterface , void** pInterface )
{
    ecs();
 
    HRESULT hr;
    HMODULE hMod = NULL;
    PDLLGETCLASSOBJECT proc = NULL;
    IClassFactory* pFactory = NULL;
 
    //Get the module from list or load it
    hMod = GetModule( szDllPath );
    if( !hMod )
    {
        lcs();
        return( false );
    }
 
    //Get Proc address
    proc = (PDLLGETCLASSOBJECT) GetProcAddress( hMod , "DllGetClassObject" );
    if( !proc )
    {
        lcs();
        return( false );
    }
 
    hr = proc( IInterface , IID_IClassFactory , (void**)&pFactory );
    if( hr || !pFactory )
    {
        lcs();
        return( false );
    }
 
    hr = pFactory->CreateInstance( NULL, IInterface , pInterface );
    if( hr || !pInterface )
    {
        lcs();
        return( false );
    }
 
    pFactory->Release();
     
    lcs();
    return( true );
}
 
 
HMODULE  cLoadPlugin::GetModule( const TCHAR* szDllPath )
{
    _tstring spath;
    _tstring mname;
    const TCHAR *pName = NULL, c = L'\\';
    HMODULE hMod = NULL;
    PDLLGETCLASSOBJECT proc = NULL;
 
     
    if( !szDllPath )
        return( NULL );
 
    //convet path to lowercase and check if file exist
    //If not a file
    spath = szDllPath;
    toLower( spath );
 
    //if( !IsFile( toLower( spath ).c_str() ) )
    //  return( false );
 
    //Is alread on list
    pName = _tcsrchr( spath.c_str() , c );
    if( !pName )
        pName = spath.c_str();
    else
        pName++;
    mname = pName;
 
    //Check if module already loaded
    hMod = isInList( mname );
 
    //if not on list load module and store it to list
    if( !hMod )
    {
        if( ( hMod = LoadLibrary( spath.c_str() ) ) == NULL )
            return( NULL );
 
         proc = (PDLLGETCLASSOBJECT) GetProcAddress( hMod , "DllGetClassObject" );
         if( !proc )
         {
             FreeLibrary( hMod );
             return( NULL );
         }
 
         //insert plugin
         m_plugins[mname] = hMod;
    }
 
    return( hMod );
}
 
#endif //_LOADPLUGIN_H_