120 lines
3 KiB
C++
120 lines
3 KiB
C++
/*===================================================================
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Microsoft Denali
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Microsoft Confidential.
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Copyright 1997 Microsoft Corporation. All Rights Reserved.
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Component: IConnectionPoint implementation
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File: ConnPt.h
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Owner: DGottner
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Implementation of IConnectionPoint
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===================================================================*/
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#ifndef _ConnPt_H
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#define _ConnPt_H
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/*
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* C C o n n e c t i o n P o i n t
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*
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* IConnectionPoint interface implementation for OLE objects
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*
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* This class contains the basic five IConnectionPoint members. The Big Three
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* (QueryInterface, AddRef, Release) are left as pure virtual, as this
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* class is designed as an intermediate class for further derivation.
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*
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* This also means that we no longer need a pointer to the controlling unknown.
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*/
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#include "DblLink.h"
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/* ****************************************************************************
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Class: CConnectionPoint
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Synopsis: Provide a reusable implementation of IConnectionPoint
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NOTE: Linked list of sinks is used because we are expecting very
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few connections. (in fact only one (Caesars))
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*/
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class CConnectionPoint : public IConnectionPoint
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{
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friend class CEnumConnections;
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private:
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struct CSinkElem : CDblLink
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{
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DWORD m_dwCookie; // cookie that we assigned the connection
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IUnknown * m_pUnkObj; // event sink
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CSinkElem(DWORD dwCookie, IUnknown *pUnkObj)
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{
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m_dwCookie = dwCookie;
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if ((m_pUnkObj = pUnkObj) != NULL) m_pUnkObj->AddRef();
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}
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~CSinkElem()
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{
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if (m_pUnkObj) m_pUnkObj->Release();
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}
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};
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CDblLink m_listSinks; // list of event sinks
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DWORD m_dwCookieNext; // Next cookie
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protected:
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IUnknown * m_pUnkContainer; // pointer to parent container
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GUID m_uidEvent; // connection point interface
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public:
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CConnectionPoint(IUnknown *, const GUID &);
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~CConnectionPoint();
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// IConnectionPoint members
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STDMETHODIMP GetConnectionInterface(GUID *);
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STDMETHODIMP GetConnectionPointContainer(IConnectionPointContainer **);
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STDMETHODIMP Advise(IUnknown *, DWORD *);
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STDMETHODIMP Unadvise(DWORD);
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STDMETHODIMP EnumConnections(IEnumConnections **);
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inline BOOL FIsEmpty() // quick way to check if list is empty w/o allocating enumerator
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{
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return m_listSinks.FIsEmpty();
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}
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};
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/* ****************************************************************************
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Class: CEnumConnections
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Synopsis: Provide the enumerator for CConnectionPoint
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*/
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class CEnumConnections : public IEnumConnections
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{
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private:
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ULONG m_cRefs; // Reference count
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CDblLink * m_pElemCurr; // Current element
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CConnectionPoint * m_pCP; // pointer to iteratee
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public:
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CEnumConnections(CConnectionPoint *pCP);
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~CEnumConnections(void);
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// The Big Three
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STDMETHODIMP QueryInterface(REFIID, LPVOID *);
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STDMETHODIMP_(ULONG) AddRef(void);
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STDMETHODIMP_(ULONG) Release(void);
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// IEnumConnections members
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STDMETHODIMP Next(ULONG, CONNECTDATA *, ULONG *);
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STDMETHODIMP Skip(ULONG);
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STDMETHODIMP Reset(void);
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STDMETHODIMP Clone(IEnumConnections **);
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};
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#endif _ConnPt_H_
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