199 lines
3 KiB
C++
199 lines
3 KiB
C++
/*++
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Copyright (C) Microsoft Corporation, 1997 - 1999
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Module Name:
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cfacchng.cxx
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Abstract:
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Implements the Class Factory for the SENS IEventObjectChange Subscriber.
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Author:
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Gopal Parupudi <GopalP>
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[Notes:]
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optional-notes
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Revision History:
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GopalP 11/17/1997 Start.
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--*/
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#include <precomp.hxx>
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//
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// Global counts for the number of objects in the server and the number of
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// locks.
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//
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ULONG g_cCFObj = 0L;
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ULONG g_cCFLock = 0L;
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//
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// Constructor and Destructor
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//
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CIEventObjectChangeCF::CIEventObjectChangeCF(
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void
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) : m_cRef(1L)
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{
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}
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CIEventObjectChangeCF::~CIEventObjectChangeCF(
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void
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)
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{
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// Empty Destructor.
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}
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//
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// QI
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//
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STDMETHODIMP
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CIEventObjectChangeCF::QueryInterface(
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REFIID riid,
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LPVOID *ppv
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)
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{
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HRESULT hr = S_OK;
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*ppv = NULL; // To handle failure cases
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// IUnknown or IClassFactory
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if (IsEqualIID(riid, IID_IUnknown) ||
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IsEqualIID(riid, IID_IClassFactory))
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{
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*ppv = (LPUNKNOWN) this;
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}
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else
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{
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hr = E_NOINTERFACE;
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}
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if (NULL != *ppv)
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{
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((LPUNKNOWN)*ppv)->AddRef();
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}
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return hr;
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}
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//
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// AddRef
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//
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STDMETHODIMP_(ULONG)
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CIEventObjectChangeCF::AddRef(
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void
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)
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{
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return InterlockedIncrement((PLONG) &m_cRef);
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}
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//
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// Release
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//
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STDMETHODIMP_(ULONG)
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CIEventObjectChangeCF::Release(
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void
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)
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{
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ULONG cRefT;
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cRefT = InterlockedDecrement((PLONG) &m_cRef);
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if (0 == m_cRef)
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{
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// Invoke the callback function.
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delete this;
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}
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return cRefT;
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}
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//
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// CreateInstance
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//
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STDMETHODIMP
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CIEventObjectChangeCF::CreateInstance(
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LPUNKNOWN pUnkOuter,
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REFIID riid,
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LPVOID *ppvObj
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)
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{
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LPCIMPIEVENTOBJECTCHANGE pObjChange;
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HRESULT hr;
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DebugTraceGuid("CIEventObjectChangeCF:CreateInstance()", riid);
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hr = E_OUTOFMEMORY;
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*ppvObj = NULL;
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pObjChange = NULL;
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//
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// Return the appropriate interface pointer.
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//
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if (IsEqualIID(riid, IID_IEventObjectChange) ||
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IsEqualIID(riid, IID_IUnknown))
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{
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SensPrintA(SENS_INFO, ("\t| ClassFactory::CreateInstance(IEventObjectChange)\n"));
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pObjChange = new CImpIEventObjectChange();
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if (NULL != pObjChange)
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{
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hr = pObjChange->QueryInterface(riid, ppvObj);
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SensPrintA(SENS_INFO, ("\t| QI on CImpIEventObjectChange returned 0x%x\n", hr));
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}
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}
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else
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{
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hr = E_NOINTERFACE;
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}
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if (NULL != *ppvObj)
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{
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InterlockedIncrement((PLONG) &g_cCFObj);
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}
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SensPrintA(SENS_INFO, ("\t| Returning 0x%x from CF:CreateInstance\n", hr));
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return hr;
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}
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//
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// LockServer
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//
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STDMETHODIMP
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CIEventObjectChangeCF::LockServer(
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BOOL fLock
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)
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{
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if (fLock)
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{
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InterlockedIncrement((PLONG) &g_cCFLock);
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}
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else
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{
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InterlockedDecrement((PLONG) &g_cCFLock);
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InterlockedIncrement((PLONG) &g_cCFObj);
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}
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return NOERROR;
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}
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