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http://xingzhesun.blogbus.com/logs/42018951.html

#pragma once
#include <atlstr.h>

class CUccEvent;
class CUccEventHandler
{
public:
 CUccEventHandler(){};
  virtual ~CUccEventHandler(){};
public:
 virtual bool Do(LPCTSTR lpMsg) = 0{};
};

class CUccEvent
{
public:
 CUccEvent(void):m_pEventHder(NULL){}

 CUccEvent(CUccEventHandler* pEventHder){
  m_pEventHder = pEventHder;
 }

 virtual ~CUccEvent(void){
  m_pEventHder = NULL;
 }

public:
 void Attach(const CUccEventHandler* pEventHder){
  m_pEventHder = (CUccEventHandler*)pEventHder;
 }

 CUccEventHandler* Detach(void){
  CUccEventHandler* pTemp = m_pEventHder;
  m_pEventHder = NULL;
  return pTemp;
 }

public:
 virtual bool Fire(LPCTSTR lpMsg) = 0{
  if (NULL != m_pEventHder)
  {
   return m_pEventHder->Do(lpMsg);
  }else{
   return FALSE;
  }
 }
private:
 CUccEventHandler* m_pEventHder;
};

class CUccGpEventHandler:public CUccEventHandler
{
public:
 CUccGpEventHandler(void){};
 virtual ~CUccGpEventHandler(){};
public:
 virtual bool Do(LPCTSTR lpMsg)
 {
  return true;
 }
};

class CUccGpEvent:public CUccEvent
{
public:
 CUccGpEvent(CUccEventHandler* pEventHder):CUccEvent(pEventHder){};  
  ~CUccGpEvent(){};
public:
 virtual bool Fire(LPCTSTR lpMsg){
  return CUccEvent::Fire(lpMsg);
 }
};