STDMETHODIMP_(ULONG) Release();

            STDMETHODIMP CreateInstance(IUnknown * pUnkOuter,REFIID riid,void ** ppvObject);

            STDMETHODIMP LockServer(BOOL fLock);

private:

            int m_refcnt;

};

// CCopyHook.cpp

//CCopyHook对象和CClassFactory对象的实现文件

#include <stdio.h>

#include "CCopyHook.h"

extern LONG nLocks;          //对象计数，用于DllCanUnloadNow

ULONG __stdcall CCopyHook::AddRef(){

            if(m_refcnt==0)

                        nLocks++;

            m_refcnt++;

            return m_refcnt;

}

ULONG __stdcall CCopyHook::Release(){

            int nNewCnt=--m_refcnt;

            if(nNewCnt<=0){

                        nLocks--;

                        delete this;

            }

            return nNewCnt;

}

HRESULT __stdcall CCopyHook::QueryInterface(REFIID iid,void** ppvObject){

            if(iid==IID_IUnknown)

                        *ppvObject=static_cast<IUnknown*>(this);

            else

                        if(iid==IID_IShellCopyHook)

                            *ppvObject=static_cast<ICopyHook*>(this);

            else

                         return E_NOINTERFACE;

            reinterpret_cast<IUnknown*>(*ppvObject)->AddRef();