120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
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//*********************************************************************
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//* Microsoft Windows **
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//* Copyright(c) Microsoft Corp., 1999 **
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//*********************************************************************
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//
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// CUNKNOWN.CPP - Implementation of IUnknown
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//
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// HISTORY:
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//
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// 1/27/99 a-jaswed Created.
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//
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// IUnknown Base class
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#include "cunknown.h"
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#include "cfactory.h"
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#include "util.h"
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///////////////////////////////////////////////////////////
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// Count of active objects. Use to determine if we can unload the DLL.
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//
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long CUnknown::s_cActiveComponents = 0;
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///////////////////////////////////////////////////////////
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// Constructor
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//
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CUnknown::CUnknown(IUnknown* pOuterUnknown)
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: m_cRef(1)
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{
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// Set pOuterUnknown pointer.
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if (pOuterUnknown == NULL)
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{
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TRACE(L"CUnknown: Using nondelegating IUnknown.") ;
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m_pOuterUnknown = reinterpret_cast<IUnknown*>(static_cast<INondelegatingUnknown*>(this)) ; // notice cast
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}
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else
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{
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TRACE(L"CUnknown: Aggregating. Using delegating IUnknown.") ;
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m_pOuterUnknown = pOuterUnknown;
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}
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// Increment count of active components.
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::InterlockedIncrement(&s_cActiveComponents) ;
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}
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///////////////////////////////////////////////////////////
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// Destructor
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//
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CUnknown::~CUnknown()
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{
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::InterlockedDecrement(&s_cActiveComponents) ;
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// If this is an exe server shut it down.
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CFactory::CloseExe(); //@local server
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}
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///////////////////////////////////////////////////////////
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// FinalRelease -- called by Release before it deletes the component.
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//
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void CUnknown::FinalRelease()
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{
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TRACE(L"FinalRelease\n") ;
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m_cRef = 1;
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}
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///////////////////////////////////////////////////////////
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// NonDelegatingIUnknown - Override to handle custom interfaces.
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//
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HRESULT __stdcall
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CUnknown::NondelegatingQueryInterface(const IID& riid, void** ppv)
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{
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// CUnknown only supports IUnknown.
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if (riid == IID_IUnknown)
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{
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return FinishQI(reinterpret_cast<IUnknown*>(static_cast<INondelegatingUnknown*>(this)), ppv) ;
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}
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else
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{
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*ppv = NULL ;
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return E_NOINTERFACE ;
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}
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}
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///////////////////////////////////////////////////////////
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//
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// AddRef
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//
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ULONG __stdcall CUnknown::NondelegatingAddRef()
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{
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return ::InterlockedIncrement(&m_cRef) ;
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}
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///////////////////////////////////////////////////////////
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//
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// Release
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//
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ULONG __stdcall CUnknown::NondelegatingRelease()
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{
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::InterlockedDecrement(&m_cRef) ;
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if (m_cRef == 0)
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{
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FinalRelease() ;
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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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// FinishQI -
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//
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// Helper function to simplify overriding NondelegatingQueryInterface
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//
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HRESULT CUnknown::FinishQI(IUnknown* pI, void** ppv)
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{
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// Copy pointer into out parameter.
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*ppv = pI ;
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// Increment reference count for this interface.
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pI->AddRef() ;
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return S_OK ;
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}
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