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ICONNPT.CPP
Package: MSDN_VC98.zip [view]
Upload User: bangxh
Upload Date: 2007-01-31
Package Size: 42235k
Code Size: 9k
Category:
Windows Develop
Development Platform:
Visual C++
- /*
- * ICONNPT.CPP
- * Polyline Component Chapter 23
- *
- * Implementation of CImpIConnectionPoint for the Polyline object
- * as well as CConnectionPoint.
- *
- *
- * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
- *
- * Kraig Brockschmidt, Microsoft
- * Internet : kraigb@microsoft.com
- * Compuserve: >INTERNET:kraigb@microsoft.com
- */
- #include "polyline.h"
- /*
- * CImpIConnPtCont:CImpIConnPtCont
- * CImpIConnPtCont::~CImpIConnPtCont
- *
- * Constructor Parameters:
- * pObj PCPolyline pointing to the object we live in.
- * pUnkOuter LPUNKNOWN of the controlling unknown.
- */
- CImpIConnPtCont::CImpIConnPtCont(PCPolyline pObj
- , LPUNKNOWN pUnkOuter)
- {
- m_cRef=0;
- m_pObj=pObj;
- m_pUnkOuter=pUnkOuter;
- return;
- }
- CImpIConnPtCont::~CImpIConnPtCont(void)
- {
- return;
- }
- /*
- * CImpIConnPtCont::QueryInterface
- * CImpIConnPtCont::AddRef
- * CImpIConnPtCont::Release
- */
- STDMETHODIMP CImpIConnPtCont::QueryInterface(REFIID riid, PPVOID ppv)
- {
- return m_pUnkOuter->QueryInterface(riid, ppv);
- }
- STDMETHODIMP_(ULONG) CImpIConnPtCont::AddRef(void)
- {
- ++m_cRef;
- return m_pUnkOuter->AddRef();
- }
- STDMETHODIMP_(ULONG) CImpIConnPtCont::Release(void)
- {
- --m_cRef;
- return m_pUnkOuter->Release();
- }
- /*
- * CImpIConnPtCont::EnumConnectionPoints
- *
- * Purpose:
- * Not implemented.
- *
- * Return Value:
- * HRESULT E_NOTIMPL
- */
- STDMETHODIMP CImpIConnPtCont::EnumConnectionPoints
- (LPENUMCONNECTIONPOINTS *ppEnum)
- {
- *ppEnum=NULL;
- return ResultFromScode(E_NOTIMPL);
- }
- /*
- * CImpIConnPtCont::FindConnectionPoint
- *
- * Purpose:
- * Returns a pointer to the IConnectionPoint for a given
- * outgoing IID.
- *
- * Parameters:
- * riid REFIID of the outgoing interface for which
- * a connection point is desired.
- * ppCP IConnectionPoint ** in which to return
- * the pointer after calling AddRef.
- *
- * Return Value:
- * HRESULT NOERROR if the connection point is found,
- * E_NOINTERFACE if it's not supported.
- */
- STDMETHODIMP CImpIConnPtCont::FindConnectionPoint(REFIID riid
- , IConnectionPoint **ppCP)
- {
- *ppCP=NULL;
- //CHAPTER24MOD
- if (IID_IPolylineAdviseSink10==riid
- || DIID_DIPolylineAdviseSink10==riid)
- {
- /*
- * This tells the connection point which one we're
- * using. Note that Polyline only has one
- * connection point and can handle only one sink.
- */
- m_pObj->m_pConnPt->SetIID(riid);
- return m_pObj->m_pConnPt->QueryInterface
- (IID_IConnectionPoint, (PPVOID)ppCP);
- }
- //End CHAPTER24MOD
- return ResultFromScode(E_NOINTERFACE);
- }
- //CConnectionPoint implementation
- /*
- * CConnectionPoint::CConnectionPoint
- * CConnectionPoint::~CConnectionPoint
- *
- * Parameters (Constructor):
- * pObj PCPolyline of the object we're in. We can
- * query this for the IConnectionPointContainer
- * interface we might need.
- */
- CConnectionPoint::CConnectionPoint(PCPolyline pObj)
- {
- m_cRef=0;
- /*
- * Our lifetime is controlled by the connectable object itself,
- * although other external clients will call AddRef and Release.
- * Since we're nested in the connectable object's lifetime,
- * there's no need to call AddRef on pObj.
- */
- m_pObj=pObj;
- return;
- }
- CConnectionPoint::~CConnectionPoint(void)
- {
- ReleaseInterface(m_pObj->m_pAdv);
- return;
- }
- //CHAPTER24MOD
- /*
- * CConnectionPoint::SetIID
- *
- * Purpose:
- * Informs the connection point which outgoing interface
- * it should use (vtable or dispatch interface).
- *
- * Parameters:
- * riid REFIID of the interface we're using.
- */
- void CConnectionPoint::SetIID(REFIID riid)
- {
- m_iid=riid;
- return;
- }
- //End CHAPTER24MOD
- /*
- * CConnectionPoint::QueryInterface
- * CConnectionPoint::AddRef
- * CConnectionPoint::Release
- *
- * Purpose:
- * Non-delegating IUnknown members for CConnectionPoint.
- */
- STDMETHODIMP CConnectionPoint::QueryInterface(REFIID riid
- , LPVOID *ppv)
- {
- *ppv=NULL;
- if (IID_IUnknown==riid || IID_IConnectionPoint==riid)
- *ppv=(LPVOID)this;
- if (NULL!=*ppv)
- {
- ((LPUNKNOWN)*ppv)->AddRef();
- return NOERROR;
- }
- return ResultFromScode(E_NOINTERFACE);
- }
- STDMETHODIMP_(ULONG) CConnectionPoint::AddRef(void)
- {
- return ++m_cRef;
- }
- STDMETHODIMP_(ULONG) CConnectionPoint::Release(void)
- {
- if (0!=--m_cRef)
- return m_cRef;
- delete this;
- return 0;
- }
- /*
- * CConnectionPoint::GetConnectionInterface
- *
- * Purpose:
- * Returns the IID of the outgoing interface supported through
- * this connection point.
- *
- * Parameters:
- * pIID IID * in which to store the IID.
- */
- STDMETHODIMP CConnectionPoint::GetConnectionInterface(IID *pIID)
- {
- if (NULL==pIID)
- return ResultFromScode(E_POINTER);
- //CHPATER24MOD
- *pIID=m_iid;
- //End CHAPTER24MOD
- return NOERROR;
- }
- /*
- * CConnectionPoint::GetConnectionPointContainer
- *
- * Purpose:
- * Returns a pointer to the IConnectionPointContainer that
- * is manageing this connection point.
- *
- * Parameters:
- * ppCPC IConnectionPointContainer ** in which to return
- * the pointer after calling AddRef.
- */
- STDMETHODIMP CConnectionPoint::GetConnectionPointContainer
- (IConnectionPointContainer **ppCPC)
- {
- return m_pObj->QueryInterface(IID_IConnectionPointContainer
- , (void **)ppCPC);
- }
- /*
- * CConnectionPoint::Advise
- *
- * Purpose:
- * Provides this connection point with a notification sink to
- * call whenever the appropriate outgoing function/event occurs.
- *
- * Parameters:
- * pUnkSink LPUNKNOWN to the sink to notify. The connection
- * point must QueryInterface on this pointer to obtain
- * the proper interface to call. The connection
- * point must also insure that any pointer held has
- * a reference count (QueryInterface will do it).
- * pdwCookie DWORD * in which to store the connection key for
- * later calls to Unadvise.
- */
- STDMETHODIMP CConnectionPoint::Advise(LPUNKNOWN pUnkSink
- , DWORD *pdwCookie)
- {
- IPolylineAdviseSink10 *pSink;
- *pdwCookie=0;
- //Only allow one connection
- if (NULL!=m_pObj->m_pAdv)
- return ResultFromScode(CONNECT_E_ADVISELIMIT);
- //CHAPTER24MOD
- /*
- * Polyline code is set to handle calls to
- * IPolylineAdviseSink10 everywhere else around the code.
- * To handle calling a control container's dispinterface
- * implementation of the dispatch version of this interface,
- * we'll create an instance of our own CAdviseRouter
- * and get an IPolylineAdviseSink10 from it. That router
- * will then convert vtable calls into IDispatch calls.
- */
- if (DIID_DIPolylineAdviseSink10==m_iid)
- {
- IDispatch *pIDisp;
- if (FAILED(pUnkSink->QueryInterface(m_iid
- , (PPVOID)&pIDisp)))
- {
- return ResultFromScode(CONNECT_E_CANNOTCONNECT);
- }
- /*
- * We have IDispatch, create a wrapper for it,
- * which takes ownership of the pointer.
- */
- pSink=new CAdviseRouter(pIDisp, m_pObj);
- pSink->AddRef();
- }
- //Otherwise, do what we always did before
- if (IID_IPolylineAdviseSink10==m_iid)
- {
- //Check for the right interface on the sink.
- if (FAILED(pUnkSink->QueryInterface(m_iid
- , (PPVOID)&pSink)))
- {
- return ResultFromScode(CONNECT_E_CANNOTCONNECT);
- }
- }
- //End CHAPTER24MOD
- *pdwCookie=ADVISEKEY;
- m_pObj->m_pAdv=pSink;
- return NOERROR;
- }
- /*
- * CConnectionPoint::Unadvise
- *
- * Purpose:
- * Terminates the connection to the notification sink identified
- * with dwCookie (that was returned from Advise). The connection
- * point has to Release any held pointers for that sink.
- *
- * Parameters:
- * dwCookie DWORD connection key from Advise.
- */
- STDMETHODIMP CConnectionPoint::Unadvise(DWORD dwCookie)
- {
- if (0==dwCookie)
- return ResultFromScode(E_INVALIDARG);
- if (ADVISEKEY!=dwCookie)
- ResultFromScode(CONNECT_E_NOCONNECTION);
- ReleaseInterface(m_pObj->m_pAdv);
- return NOERROR;
- }
- /*
- * CConnectionPoint::EnumConnections
- *
- * Purpose:
- * Not implemented.
- */
- STDMETHODIMP CConnectionPoint::EnumConnections
- (LPENUMCONNECTIONS *ppEnum)
- {
- *ppEnum=NULL;
- return ResultFromScode(E_NOTIMPL);
- }