96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
/*++
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Copyright (C) 1993-1999 Microsoft Corporation
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Module Name:
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iextconn.cpp
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Abstract:
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Implementation of IExternalConnection as required for an
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in-process object that supports linking to embedding.
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Specifically, this will call IOleObject::Close when there
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are no more strong locks on the object.
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--*/
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#include "polyline.h"
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#include "unkhlpr.h"
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// CImpIExternalConnection interface implementation
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CImpIExternalConnection::CImpIExternalConnection(PCPolyline pObj
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, LPUNKNOWN pUnkOuter)
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{
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m_cRef=0;
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m_pObj=pObj;
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m_pUnkOuter=pUnkOuter;
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m_cLockStrong=0L;
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return;
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}
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IMPLEMENT_CONTAINED_DESTRUCTOR(CImpIExternalConnection)
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IMPLEMENT_CONTAINED_IUNKNOWN(CImpIExternalConnection)
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/*
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* CImpIExternalConnection::AddConnection
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*
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* Purpose:
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* Informs the object that a strong connection has been made to it.
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*
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* Parameters:
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* dwConn DWORD identifying the type of connection, taken
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* from the EXTCONN enumeration.
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* dwReserved DWORD reserved. This is used inside OLE and
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* should not be validated.
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*
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* Return Value:
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* DWORD The number of connection counts on the
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* object, used for debugging purposes only.
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*/
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STDMETHODIMP_(DWORD) CImpIExternalConnection::AddConnection
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(DWORD dwConn, DWORD /* dwReserved */)
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{
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if (EXTCONN_STRONG & dwConn)
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return ++m_cLockStrong;
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return 0;
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}
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/*
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* CImpIExternalConnection::ReleaseConnection
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*
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* Purpose:
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* Informs an object that a connection has been taken away from
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* it in which case the object may need to shut down.
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*
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* Parameters:
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* dwConn DWORD identifying the type of connection,
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* taken from the EXTCONN enumeration.
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* dwReserved DWORD reserved. This is used inside OLE and
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* should not be validated.
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* dwRerved DWORD reserved
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* fLastReleaseCloses BOOL indicating if the last call to this
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* function should close the object.
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*
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* Return Value:
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* DWORD The number of remaining connection counts on
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* the object, used for debugging purposes only.
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*/
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STDMETHODIMP_(DWORD) CImpIExternalConnection::ReleaseConnection
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(DWORD dwConn, DWORD /* dwReserved */, BOOL fLastReleaseCloses)
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{
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if (EXTCONN_STRONG==dwConn)
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{
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if (0==--m_cLockStrong && fLastReleaseCloses)
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m_pObj->m_pImpIOleObject->Close(OLECLOSE_SAVEIFDIRTY);
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return m_cLockStrong;
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}
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return 0L;
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}
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