www.pudn.com > tapirecv.rar > Processing.h

/* 
  
Copyright (c) 1999 - 2000  Microsoft Corporation 
 
 
Module Name: 
 
    Processing.h  
 
 
Abstract:  
     
    Declaration of the CTAPIEventNotification object 
 
*/ 
 
 
#ifndef __TAPIEventNotification_H__ 
#define __TAPIEventNotification_H__ 
 
 
// 
// declaration of implementation of the interface that is registered 
// with TAPI to receive notification messages 
// 
 
class CTAPIEventNotification : public ITTAPIEventNotification 
{ 
 
private: 
 
    // 
    // reference counting 
    // 
 
    LONG       m_dwRefCount; 
 
public: 
 
 
    // 
    // ITTAPIEventNotification 
    // 
 
    // 
    // the method called by TAPI when there is an event 
    // 
 
    HRESULT STDMETHODCALLTYPE Event(IN TAPI_EVENT TapiEvent, 
                                    IN IDispatch *pEvent); 
     
 
    // 
    // IUnknown 
    // 
 
    HRESULT STDMETHODCALLTYPE QueryInterface(IN REFIID iid, 
                                             OUT void **ppvObject) 
    { 
        if (iid == IID_ITTAPIEventNotification) 
        { 
            AddRef(); 
            *ppvObject = (void *)this; 
            return S_OK; 
        } 
 
        if (iid == IID_IUnknown) 
        { 
            AddRef(); 
            *ppvObject = (void *)this; 
            return S_OK; 
        } 
 
        return E_NOINTERFACE; 
    } 
 
     
    // 
    // reference counting needs to be thread safe 
    // 
 
    ULONG STDMETHODCALLTYPE AddRef() 
    { 
        ULONG l = InterlockedIncrement(&m_dwRefCount); 
 
        return l; 
    } 
     
	ULONG STDMETHODCALLTYPE Release() 
    { 
        ULONG l = InterlockedDecrement(&m_dwRefCount); 
 
        if ( 0 == l) 
        { 
            delete this; 
        } 
         
        return l; 
    } 
 
 
 
public: 
 
 
    CTAPIEventNotification()  
    {  
 
        // 
        // freshly created object has an outstanding reference count 
        //  
 
        m_dwRefCount = 1; 
    } 
 
 
 
    // 
    // the object should only be destroyed from Release(). 
    // destructor is private to enforce this. 
    // 
 
private: 
 
    ~CTAPIEventNotification() 
    { 
 
        // 
        // reference count here must be 0, otherwise we have a bug in the app 
        // 
 
        _ASSERTE(m_dwRefCount == 0); 
    } 
 
}; 
 
#endif //__TAPIEventNotification_H__