180 lines
4.1 KiB
C++
180 lines
4.1 KiB
C++
/*++
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Copyright (C) 1995-2001 Microsoft Corporation
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Module Name:
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CFDYN.CPP
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Abstract:
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Defines the virtual base class for the Dynamic Provider
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class factory objects. This code was largly pilfered from
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the Brockschmidt samples. The class is always overriden
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so that each provider type (DDE, registry, etc.) will have
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its own class factory.
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History:
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a-davj 27-Sep-95 Created.
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--*/
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#include "precomp.h"
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#include "cfdyn.h"
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//***************************************************************************
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// CCFDyn::CCFDyn
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// CCFDyn::~CCFDyn
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//
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// DESCRIPTION:
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//
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// Constructor and destructor.
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//
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//***************************************************************************
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CCFDyn::CCFDyn(void)
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{
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InterlockedIncrement(&lObj);
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m_cRef=0L;
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return;
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}
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CCFDyn::~CCFDyn(void)
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{
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InterlockedDecrement(&lObj);
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return;
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}
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//***************************************************************************
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// HRESULT CCFDyn::QueryInterface
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// long CCFDyn::AddRef
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// long CCFDyn::Release
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//
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// DESCRIPTION:
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//
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// Standard Com IUNKNOWN functions.
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//
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//***************************************************************************
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STDMETHODIMP CCFDyn::QueryInterface(
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IN REFIID riid,
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OUT PPVOID ppv)
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{
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*ppv=NULL;
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if (IID_IUnknown==riid || IID_IClassFactory==riid)
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*ppv=this;
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if (NULL!=*ppv)
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{
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((LPUNKNOWN)*ppv)->AddRef();
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return NOERROR;
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}
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return ResultFromScode(E_NOINTERFACE);
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}
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STDMETHODIMP_(ULONG) CCFDyn::AddRef(void)
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{
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return InterlockedIncrement(&m_cRef);
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}
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STDMETHODIMP_(ULONG) CCFDyn::Release(void)
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{
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long lRet = InterlockedDecrement(&m_cRef);
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if (0L!=lRet)
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return lRet;
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delete this;
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return 0L;
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}
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//***************************************************************************
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// HRESULT CCFDyn::CreateInstance
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//
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// DESCRIPTION:
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//
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// Instantiates a provider object returning an interface pointer. Note
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// that the CreateImpObj routine is always overriden in order
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// to create a particular type of provider.
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//
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// PARAMETERS:
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// pUnkOuter LPUNKNOWN to the controlling IUnknown if we are
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// being used in an aggregation.
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// riid REFIID identifying the interface the caller
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// desires to have for the new object.
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// ppvObj PPVOID in which to store the desired
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// interface pointer for the new object.
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//
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// RETURN VALUE:
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// HRESULT NOERROR if successful, otherwise E_NOINTERFACE
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// if we cannot support the requested interface.
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//***************************************************************************
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STDMETHODIMP CCFDyn::CreateInstance(
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IN LPUNKNOWN pUnkOuter,
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IN REFIID riid,
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OUT PPVOID ppvObj)
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{
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IUnknown * pObj;
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HRESULT hr;
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*ppvObj=NULL;
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hr=ResultFromScode(E_OUTOFMEMORY);
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//Verify that a controlling unknown asks for IUnknown
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if (NULL!=pUnkOuter && IID_IUnknown!=riid)
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return ResultFromScode(CLASS_E_NOAGGREGATION);
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//Create the object passing function to notify on destruction.
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pObj = CreateImpObj();
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if (NULL==pObj)
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return hr;
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hr=pObj->QueryInterface(riid, ppvObj);
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//Kill the object if initial creation or Init failed.
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if (FAILED(hr))
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delete pObj;
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else
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InterlockedIncrement(&lObj); // dec takes place in the objects destructor
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return hr;
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}
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//***************************************************************************
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// HRESULT CCFDyn::LockServer
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//
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// DESCRIPTION:
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// Increments or decrements the lock count of the DLL. If the
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// lock count goes to zero and there are no objects, the DLL
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// is allowed to unload. See DllCanUnloadNow.
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//
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// PARAMETERS:
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// fLock BOOL specifying whether to increment or
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// decrement the lock count.
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//
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// RETURN VALUE:
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// HRESULT NOERROR always.
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//***************************************************************************
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STDMETHODIMP CCFDyn::LockServer(
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IN BOOL fLock)
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{
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if (fLock)
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InterlockedIncrement(&lLock);
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else
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InterlockedDecrement(&lLock);
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return NOERROR;
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}
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