241 lines
5.3 KiB
C++
241 lines
5.3 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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//
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// CopyRight (c) 1999-2000 Microsoft Corporation
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//
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// Module Name:
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// ProvFactory.cpp
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//
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// Description:
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// Implementation of CProvFactory class.
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//
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// Author:
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// Henry Wang (HenryWa) 24-AUG-1999
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//
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//////////////////////////////////////////////////////////////////////////////
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#include "Pch.h"
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#include "ProvFactory.h"
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//****************************************************************************
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//
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// CProvFactory
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//
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//****************************************************************************
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//////////////////////////////////////////////////////////////////////////////
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//++
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//
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// STDMETHODIMP
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// CProvFactory::QueryInterface(
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// REFIID riidIn,
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// PPVOID ppvOut
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// )
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//
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// Description:
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// Query for an interface supported by this COM object.
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//
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// Arguments:
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// riidIn -- Interface ID.
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// ppvOut -- Receives the interface pointer.
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//
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// Return Values:
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// NOERROR
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// E_NOINTERFACE
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//
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//--
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//////////////////////////////////////////////////////////////////////////////
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STDMETHODIMP
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CProvFactory::QueryInterface(
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REFIID riidIn,
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PPVOID ppvOut
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)
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{
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*ppvOut = NULL;
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if ( IID_IUnknown == riidIn || IID_IClassFactory == riidIn )
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{
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*ppvOut = this;
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}
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if ( NULL != *ppvOut )
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{
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( (LPUNKNOWN) *ppvOut )->AddRef( );
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return NOERROR;
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}
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return E_NOINTERFACE;
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} //*** CProvFactory::QueryInterface()
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//////////////////////////////////////////////////////////////////////////////
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//++
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//
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// STDMETHODIMP_( ULONG )
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// CProvFactory::AddRef ( void )
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//
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// Description:
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// Increment the reference count on the COM object.
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//
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// Arguments:
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// None.
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//
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// Return Values:
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// New count of references.
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//
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//--
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//////////////////////////////////////////////////////////////////////////////
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STDMETHODIMP_( ULONG )
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CProvFactory::AddRef ( void )
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{
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//return ++m_cRef;
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return InterlockedIncrement( (long *) &m_cRef );
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} //*** CProvFactory::AddRef()
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//////////////////////////////////////////////////////////////////////////////
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//++
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//
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// STDMETHODIMP_( ULONG )
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// CProvFactory::Release( void )
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//
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// Description:
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// Decrement the reference count on the COM object.
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//
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// Arguments:
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// None.
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//
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// Return Values:
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// New count of references.
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//
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//--
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//////////////////////////////////////////////////////////////////////////////
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STDMETHODIMP_( ULONG )
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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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{
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delete this;
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} // if: 0L == nNewCount
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return nNewCount;
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} //*** CProvFactory::Release()
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//////////////////////////////////////////////////////////////////////////////
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//++
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//
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// STDMETHODIMP
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// CProvFactory::CreateInstance(
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// LPUNKNOWN pUnkOuterIn,
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// REFIID riidIn,
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// PPVOID ppvObjOut
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// )
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//
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// Description:
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// Instantiates a Locator object returning an interface pointer.
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//
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// Arguments:
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// pUnkOuterIn
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// LPUNKNOWN to the controlling IUnknown if we are being used in
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// an aggregation.
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//
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// riidIn
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// REFIID identifying the interface the caller desires to have
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// for the new object.
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//
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// ppvObjOut
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// PPVOID in which to store the desired interface pointer for the
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// new object.
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//
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// Return Values:
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// NOERROR
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// E_OUTOFMEMORY
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// E_NOINTERFACE
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// CLASS_E_NOAGGREGATION
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//
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//--
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//////////////////////////////////////////////////////////////////////////////
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STDMETHODIMP
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CProvFactory::CreateInstance(
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LPUNKNOWN pUnkOuterIn,
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REFIID riidIn,
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PPVOID ppvObjOut
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)
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{
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IUnknown * pObj = NULL;
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HRESULT hr;
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*ppvObjOut = NULL;
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// This object doesnt support aggregation.
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if ( NULL != pUnkOuterIn )
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{
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return CLASS_E_NOAGGREGATION;
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} /// if: not pUnkOuter
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hr = m_pFactoryData->pFnCreateInstance(
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NULL,
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reinterpret_cast< VOID ** >( &pObj )
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);
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if ( NULL == pObj )
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{
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return E_OUTOFMEMORY;
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} // if: pObj is NULL
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hr = pObj->QueryInterface( riidIn, ppvObjOut );
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//Kill the object if initial creation or Init failed.
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if ( FAILED( hr ) )
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{
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delete pObj;
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} // if: failed
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return hr;
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} //*** CProvFactory::CreateInstance()
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//////////////////////////////////////////////////////////////////////////////
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//++
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//
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// STDMETHODIMP
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// CProvFactory::LockServer(
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// BOOL fLockIn
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// )
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//
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// Description:
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// Increments or decrements the lock count of the DLL. If the lock
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// count goes to zero and there are no objects, the DLL is allowed to
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// unload. See DllCanUnloadNow.
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//
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// Arguments:
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// fLockIn
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// BOOL specifying whether to increment or decrement the lock count.
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//
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// Return Values:
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// NOERROR
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//
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//--
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//////////////////////////////////////////////////////////////////////////////
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STDMETHODIMP
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CProvFactory::LockServer(
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BOOL fLockIn
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)
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{
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if ( fLockIn )
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{
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InterlockedIncrement( & g_cLock );
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} /// if: lock
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else
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{
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InterlockedDecrement( & g_cLock );
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} /// else:
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return NOERROR;
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} //*** CProvFactory::LockServer()
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