ICONNPT.CPP

/* 
* ICONNPT.CPP
* Polyline Component Chapter 10
*
* 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;

//CHAPTER10MOD
if (IID_IPolylineAdviseSink10==riid)
//End CHAPTER10MOD
{
return m_pObj->m_pConnPt->QueryInterface
(IID_IConnectionPoint, (PPVOID)ppCP);
}

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;
}



/*
* 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);

//CHAPTER10MOD
*pIID=IID_IPolylineAdviseSink10;
//End CHAPTER10MOD
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)
{
//CHAPTER10MOD
IPolylineAdviseSink10 *pSink;
//End CHAPTER10MOD

*pdwCookie=0;

//Only allow one connection
if (NULL!=m_pObj->m_pAdv)
return ResultFromScode(CONNECT_E_ADVISELIMIT);

//Check for the right interface on the sink.
//CHAPTER10MOD
if (FAILED(pUnkSink->QueryInterface(IID_IPolylineAdviseSink10
, (PPVOID)&pSink)))
//End CHAPTER10MOD
return ResultFromScode(CONNECT_E_CANNOTCONNECT);

*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);
}