/*
* 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