An MFC extension library to enable DLL plug-in technology for your application using MESSAGE_MAPs

// (c) R.I.Allen 2002
// You may use this code in anyway that you feel, no guarantees or waranties are implied
// please keep all headers with any source used.
//
// PlugInApp.h: interface for the CPlugInApp class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_PLUGINAPP_H__67549E26_C1D2_11D6_8DCB_F4C2093E0F42__INCLUDED_)
#define AFX_PLUGINAPP_H__67549E26_C1D2_11D6_8DCB_F4C2093E0F42__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CDLLWrapper ;
class CPlugInMap ;

class _PLUGIN_API CPlugInApp : public CWinApp  
{
public:
	CPlugInApp();
	virtual ~CPlugInApp();

public:
	// functions supplied / overriden
	CString		GetApplicationPath() ;
	// these procedures are called from the constructors of PI window base classes
	CPlugInMap** GetMessageMaps(CCmdTarget *pObj, int &count) ;
	// functions to allow plug in maps to be called
	BOOL		ProcessCommandMessageMaps(CPIState& state, bool pre, bool *pbSuppress, CPlugInMap** pMaps, int count, UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo) ;
	BOOL		CallCommandMessageMap(CPlugInMap *pPI, UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo) ;
	BOOL		DispatchCmdMsg(CCmdTarget* pTarget, UINT nID, int nCode, AFX_PMSG pfn, void* pExtra, UINT nSig, AFX_CMDHANDLERINFO* pHandlerInfo) ;
	const AFX_MSGMAP_ENTRY* FindMessageEntry(const AFX_MSGMAP_ENTRY* lpEntry, UINT nMsg, UINT nCode, UINT nID) ;
	BOOL		ProcessWindowMessageMaps(CPIState& state, bool pre, bool *pbSuppress, CPlugInMap** pMaps, int count, UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult) ;
	BOOL		CallWindowMessageMap(CPlugInMap *pPI, UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult) ;
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CPlugInApp)
	public:
	virtual int ExitInstance();
	//}}AFX_VIRTUAL
	int			GetPlugInDLLCount() const;
	CDLLWrapper*	GetDLL(int index);
protected:
	void		LoadPlugInDLLs() ;		// Loads any plug in DLLs
	void		ReplaceDocManager() ;
	void		RegisterDLLDocumentTemplates() ;
	void		InitialisePlugIns() ;
	void		SuppressThisMessage(bool suppress) { m_bSuppressThisMessage = suppress ;} ;
	void		UpdateMenus() ;
	void		UpdateAccelerators() ;

	// member variables
	int			m_PlugInDLLCount ;
	CDLLWrapper	*m_pPlugInDLLs ;		// the actual loaded plug in DLL's
private:
	CPlugInMap**	m_pMaps ;
	int				m_MapCount ;
	bool			m_bSuppressThisMessage ;
	CPIState		m_state;
public:
// Implementation
	//{{AFX_MSG(CPlugInApp)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

#endif // !defined(AFX_PLUGINAPP_H__67549E26_C1D2_11D6_8DCB_F4C2093E0F42__INCLUDED_)