150 lines
3.8 KiB
C++
150 lines
3.8 KiB
C++
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//***************************************************************************
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//
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// Copyright (c) 1997-1999 Microsoft Corporation.
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//
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// File : WLBSProvClassFac.cpp
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//
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// Module: WLBS Instance provider class factory
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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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// History:
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//
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//***************************************************************************
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#include "WLBS_Provider.h"
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//***************************************************************************
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//
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// CWLBSClassFactory::CWLBSClassFactory
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// CWLBSClassFactory::~CWLBSClassFactory
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//
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// Constructor Parameters:
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// None
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//***************************************************************************
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CWLBSClassFactory::CWLBSClassFactory()
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: m_cRef(1)
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{
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return;
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}
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CWLBSClassFactory::~CWLBSClassFactory(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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// CWLBSClassFactory::QueryInterface
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// CWLBSClassFactory::AddRef
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// CWLBSClassFactory::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 CWLBSClassFactory::QueryInterface(REFIID a_riid, PPVOID a_ppv)
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{
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*a_ppv = NULL;
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if (IID_IUnknown==a_riid || IID_IClassFactory==a_riid)
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*a_ppv = static_cast<IClassFactory *>(this);
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if (*a_ppv != NULL) {
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reinterpret_cast<IUnknown *>(*a_ppv)->AddRef();
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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STDMETHODIMP_(ULONG) CWLBSClassFactory::AddRef(void)
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{
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return InterlockedIncrement(&m_cRef);
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}
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STDMETHODIMP_(ULONG) CWLBSClassFactory::Release(void)
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{
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if (InterlockedDecrement(&m_cRef) == 0) {
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delete this;
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return 0;
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}
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return m_cRef;
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}
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//***************************************************************************
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//
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// CWLBSClassFactory::CreateInstance
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//
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// Purpose: Instantiates a provider object returning an interface pointer.
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//
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// Parameters:
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// a_pUnkOuter LPUNKNOWN to the controlling IUnknown if we are
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// being used in an aggregation.
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// a_riid REFIID identifying the interface the caller
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// desires to have for the new object.
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// a_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 CWLBSClassFactory::CreateInstance(
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LPUNKNOWN a_pUnkOuter,
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REFIID a_riid,
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PPVOID a_ppvObj
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)
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{
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CWLBSProvider * pObj = NULL;
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HRESULT hr;
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*a_ppvObj = NULL;
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// This object doesnt support aggregation.
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if (a_pUnkOuter != NULL)
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return CLASS_E_NOAGGREGATION;
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// Create the object.
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pObj = new CWLBSProvider();
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if (pObj == NULL)
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return E_OUTOFMEMORY;
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hr = pObj->QueryInterface(a_riid, a_ppvObj);
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if( FAILED(hr) ) {
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delete pObj;
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pObj = NULL;
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}
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return hr;
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}
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//***************************************************************************
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//
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// CWLBSClassFactory::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 CWLBSClassFactory::LockServer(BOOL a_bLock)
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{
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if (a_bLock)
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InterlockedIncrement(&g_cServerLocks);
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else
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InterlockedDecrement(&g_cServerLocks);
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return S_OK;
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}
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