158 lines
3.7 KiB
C++
158 lines
3.7 KiB
C++
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//***************************************************************************
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//
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// CLASSFAC.CPP
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//
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// Module: CDM Provider
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//
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// Purpose: Contains the class factory. This creates objects when
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// connections are requested.
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//
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// Copyright (c) 2000 Microsoft Corporation
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//
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//***************************************************************************
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#include <objbase.h>
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#include "sample.h"
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//***************************************************************************
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//
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// CProvFactory::CProvFactory
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// CProvFactory::~CProvFactory
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//
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// Constructor Parameters:
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// None
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//***************************************************************************
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CProvFactory::CProvFactory()
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{
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m_cRef=0L;
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return;
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}
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CProvFactory::~CProvFactory(void)
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{
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return;
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}
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//***************************************************************************
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//
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// CProvFactory::QueryInterface
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// CProvFactory::AddRef
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// CProvFactory::Release
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//
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// Purpose: Standard Ole routines needed for all interfaces
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//
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//***************************************************************************
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STDMETHODIMP CProvFactory::QueryInterface(REFIID riid
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, 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 E_NOINTERFACE;
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}
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STDMETHODIMP_(ULONG) CProvFactory::AddRef(void)
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{
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LONG cRef;
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cRef = m_cRef+1;
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InterlockedIncrement((LPLONG)&m_cRef);
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return (cRef);
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}
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STDMETHODIMP_(ULONG) CProvFactory::Release(void)
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{
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ULONG nNewCount = InterlockedDecrement((long *)&m_cRef);
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if (0L == nNewCount)
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delete this;
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return nNewCount;
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}
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//***************************************************************************
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//
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// CProvFactory::CreateInstance
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//
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// Purpose: Instantiates a Locator object returning an interface pointer.
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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 CProvFactory::CreateInstance(LPUNKNOWN pUnkOuter
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, REFIID riid, PPVOID ppvObj)
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{
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CClassPro * pObj;
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HRESULT hr;
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*ppvObj=NULL;
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// This object doesnt support aggregation.
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if (NULL!=pUnkOuter)
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return CLASS_E_NOAGGREGATION;
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// Create the locator object.
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pObj=new CClassPro();
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if (NULL==pObj)
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return E_OUTOFMEMORY;
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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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return hr;
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}
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//***************************************************************************
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//
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// CProvFactory::LockServer
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//
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// Purpose:
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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 CProvFactory::LockServer(BOOL fLock)
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{
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if (fLock)
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InterlockedIncrement(&g_cLock);
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else
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InterlockedDecrement(&g_cLock);
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return NOERROR;
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}
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