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///////////////////////////////////////////////////////////
//
// CUnknown.cpp
//
// Implementation of IUnknown Base class
//
#include "CUnknown.h"
#include "CFactory.h"
#include "Util.h"
static inline void trace(char* msg)
{Util::Trace("CUnknown", msg, S_OK) ;}
static inline void trace(char* msg, HRESULT hr)
{Util::Trace("CUnknown", msg, hr) ;}
///////////////////////////////////////////////////////////
//
// Count of active objects
// - Use to determine if we can unload the DLL.
//
long CUnknown::s_cActiveComponents = 0 ;
///////////////////////////////////////////////////////////
//
// Constructor
//
CUnknown::CUnknown(IUnknown* pUnknownOuter)
: m_cRef(1)
{
// Set m_pUnknownOuter pointer.
if (pUnknownOuter == NULL)
{
trace("Not aggregating; delegate to nondelegating IUnknown.") ;
m_pUnknownOuter = reinterpret_cast<IUnknown*>
(static_cast<INondelegatingUnknown*>
(this)) ; // notice cast
}
else
{
trace("Aggregating; delegate to outer IUnknown.") ;
m_pUnknownOuter = pUnknownOuter ;
}
// Increment count of active components.
::InterlockedIncrement(&s_cActiveComponents) ;
}
//
// Destructor
//
CUnknown::~CUnknown()
{
::InterlockedDecrement(&s_cActiveComponents) ;
// If this is an EXE server, shut it down.
CFactory::CloseExe() ;
}
//
// FinalRelease - called by Release before it deletes the component
//
void CUnknown::FinalRelease()
{
trace("Increment reference count for final release.") ;
m_cRef = 1 ;
}
//
// Nondelegating IUnknown
// - Override to handle custom interfaces.
//
HRESULT __stdcall
CUnknown::NondelegatingQueryInterface(const IID& iid, void** ppv)
{
// CUnknown supports only IUnknown.
if (iid == IID_IUnknown)
{
return FinishQI(reinterpret_cast<IUnknown*>
(static_cast<INondelegatingUnknown*>(this)),
ppv) ;
}
else
{
*ppv = NULL ;
return E_NOINTERFACE ;
}
}
//
// AddRef
//
ULONG __stdcall CUnknown::NondelegatingAddRef()
{
return InterlockedIncrement(&m_cRef) ;
}
//
// Release
//
ULONG __stdcall CUnknown::NondelegatingRelease()
{
InterlockedDecrement(&m_cRef) ;
if (m_cRef == 0)
{
FinalRelease() ;
delete this ;
return 0 ;
}
return m_cRef ;
}
//
// FinishQI
// - Helper function to simplify overriding
// NondelegatingQueryInterface
//
HRESULT CUnknown::FinishQI(IUnknown* pI, void** ppv)
{
*ppv = pI ;
pI->AddRef() ;
return S_OK ;
}
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