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