/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

* 

* Description:

*/

#ifndef	_DST_DLL_MODULE_

#define _DST_DLL_MODULE_

class CDLLModule

{

public:

	CDLLModule() : m_hDLL(NULL)

	{

	}

	virtual ~CDLLModule()	//destructor, free the library

	{

		if (m_hDLL)

			::FreeLibrary(m_hDLL);

	}

	//////////////////////////////////////////////////////////////////

	// See if dll been loaded, returning true dose not mean that all

	// functions of the dll is valid.

	bool	IsLoaded(void) 

	{

		return m_hDLL != NULL;

	}

	/////////////////////////////////////////////////////////

	//	pure virtual, must implemented in derived class

	//	used macros to generate the implementation

	virtual bool	Init(LPCTSTR szDll)=0;

protected:

	HMODULE m_hDLL;

};

//////////////////////////////////////////////////////////////////////

// macros to implement the Init function

#define DECLARE_DLL_FUNCTION(ret, cc, func, params) \

	ret	(cc* func)params;

#define BEGIN_DLL_INIT() \

	bool Init(LPCTSTR szDll) \

	{ \

		if (m_hDLL) \

			::FreeLibrary(m_hDLL); \

		m_hDLL = ::LoadLibrary(szDll); \

		bool	bOk = true;

#define INIT_DLL_FUNCTION(ret, cc, func, params, origin) \

		if (m_hDLL) \

		{ \

			func = (ret (cc* )params)GetProcAddress(m_hDLL, origin); \

		} \

		else \

			func = NULL; \

		if (!func) \

			bOk = false;

#define END_DLL_INIT() \

		return bOk; \

	} 

#endif