www.pudn.com > TreePropSheetEx.rar > hookwnd.h

/* 
Module : HOOKWND.H 
Purpose: Defines the interface for an MFC class to implement message hooking before CWnd gets there 
Created: PJN / 24-02-1999 
History: None 
 
Copyright (c) 1999 by PJ Naughter.   
All rights reserved. 
 
*/ 
 
#ifndef __HOOKWND_H__ 
#define __HOOKWND_H__ 
 
#ifndef __AFXMT_H__ 
#pragma message("CHookWnd class requires afxmt.h in your PCH") 
#endif 
 
 
//Class which implements message hooking before CWnd gets there 
class CHookWnd : public CObject 
{ 
public: 
//Constructors / Destructors 
  CHookWnd(); 
  ~CHookWnd(); 
 
//Other Methods 
  BOOL IsHooked() const; 
  BOOL FirstInChain() const; 
  BOOL LastInChain() const; 
  int  MiddleOfChain() const; 
  int  SizeOfHookChain() const; 
 
protected: 
	DECLARE_DYNAMIC(CHookWnd); 
 
  //Hooking & UnHooking 
  void Hook(CWnd* pWnd);  
  void UnHook(); 
 
  //When you want to pass on the message from your WindowProc function 
  //you can call this function just like MFC. 
  LRESULT Default(); 
 
  //This is the function you need to override in your derived 
  //version of CHookWnd so that you can handle the window messages 
  virtual LRESULT WindowProc(UINT nMsg, WPARAM wParam, LPARAM lParam); 
 
  //The callback function through which all window messages 
  //will be handled when they are hooked by CHookWnd  
  static LRESULT CALLBACK HookProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam); 
 
  //Functions which manage the HWND -> CHookWnd* mapping 
  static void      Remove(CHookWnd* pWnd); 
  static void      RemoveAll(HWND hWnd); 
  static void      Add(CHookWnd* pWnd); 
  static CHookWnd* GetFirstHook(HWND hWnd); 
 
//Data variables 
  CWnd*     m_pOriginalWnd;     //The window being hooked 
  WNDPROC   m_pOriginalWndProc; //The orignal window procedure 
  CHookWnd* m_pNextHook;        //The next hook in the chain 
  static CCriticalSection m_cs; //Critical section which is used to make the code thread safe 
}; 
 
 
 
#endif //__HOOKWND_H__