104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
// Copyright (C) 1996-1997 Microsoft Corporation. All rights reserved.
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#include "header.h"
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#include "Unknown.H"
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#include <stddef.h>
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//=--------------------------------------------------------------------------=
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// CUnknownObject::CPrivateUnknownObject::m_pMainUnknown
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//=--------------------------------------------------------------------------=
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// this method is used when we're sitting in the private unknown object,
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// and we need to get at the pointer for the main unknown. basically, it's
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// a little better to do this pointer arithmetic than have to store a pointer
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// to the parent, etc.
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inline CUnknownObject *CUnknownObject::CPrivateUnknownObject::m_pMainUnknown
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(
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void
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)
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{
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return (CUnknownObject *)((LPBYTE)this - offsetof(CUnknownObject, m_UnkPrivate));
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}
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//=--------------------------------------------------------------------------=
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// CUnknownObject::CPrivateUnknownObject::QueryInterface
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//=--------------------------------------------------------------------------=
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// this is the non-delegating internal QI routine.
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//
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// Parameters:
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// REFIID - [in] interface they want
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// void ** - [out] where they want to put the resulting object ptr.
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//
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// Output:
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// HRESULT - S_OK, E_NOINTERFACE
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STDMETHODIMP CUnknownObject::CPrivateUnknownObject::QueryInterface(REFIID riid, void **ppvObjOut)
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{
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CHECK_POINTER(ppvObjOut);
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// if they're asking for IUnknown, then we have to pass them ourselves.
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// otherwise defer to the inheriting object's InternalQueryInterface
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//
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if (DO_GUIDS_MATCH(riid, IID_IUnknown)) {
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m_cRef++;
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*ppvObjOut = (IUnknown *)this;
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return S_OK;
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} else
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return m_pMainUnknown()->InternalQueryInterface(riid, ppvObjOut);
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// dead code
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}
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//=--------------------------------------------------------------------------=
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// CUnknownObject::CPrivateUnknownObject::AddRef
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//=--------------------------------------------------------------------------=
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// adds a tick to the current reference count.
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//
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// Output:
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// ULONG - the new reference count
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ULONG CUnknownObject::CPrivateUnknownObject::AddRef(void)
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{
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return ++m_cRef;
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}
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//=--------------------------------------------------------------------------=
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// CUnknownObject::CPrivateUnknownObject::Release
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//=--------------------------------------------------------------------------=
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// removes a tick from the count, and delets the object if necessary
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//
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// Output:
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// ULONG - remaining refs
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ULONG CUnknownObject::CPrivateUnknownObject::Release (void)
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{
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ULONG cRef = --m_cRef;
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if (!m_cRef)
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delete m_pMainUnknown();
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return cRef;
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}
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//=--------------------------------------------------------------------------=
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// CUnknownObject::InternalQueryInterface
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//=--------------------------------------------------------------------------=
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// objects that are aggregated use this to support additional interfaces.
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// they should call this method on their parent so that any of it's interfaces
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// are queried.
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//
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// Parameters:
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// REFIID - [in] interface they want
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// void ** - [out] where they want to put the resulting object ptr.
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//
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// Output:
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// HRESULT - S_OK, E_NOINTERFACE
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HRESULT CUnknownObject::InternalQueryInterface(REFIID riid, void **ppvObjOut)
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{
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*ppvObjOut = NULL;
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return E_NOINTERFACE;
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}
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