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C/C++ code:

// ÀàÉùÃ÷
class CErrReporter : public IAMErrorLog
{
protected:
long m_lRef; // Reference count.

public:
CErrReporter() { m_lRef = 0; }

// IUnknown
STDMETHOD(QueryInterface(REFIID, void**));
STDMETHOD_(ULONG, AddRef());
STDMETHOD_(ULONG, Release());

// IAMErrorLog
STDMETHOD(LogError(LONG, BSTR, LONG, HRESULT, VARIANT*));
};

// ²¿·ÖʵÏÖ
STDMETHODIMP CErrReporter::QueryInterface(REFIID riid, void **ppv)
{
if (ppv == NULL) return E_POINTER;

*ppv = NULL;
if (riid == IID_IUnknown)
*ppv = static_cast<IUnknown*>(this);
else if (riid == IID_IAMErrorLog)
*ppv = static_cast<IAMErrorLog*>(this);

else
return E_NOINTERFACE;

AddRef();
return S_OK;
}

STDMETHODIMP_(ULONG) CErrReporter::AddRef()
{
return InterlockedIncrement(&m_lRef);
}

STDMETHODIMP_(ULONG) CErrReporter::Release()
{
// Store the decremented count in a temporary
// variable.
ULONG uCount = InterlockedDecrement(&m_lRef);
if (uCount == 0)
{
delete this;
}
// Return the temporary variable, not the member
// variable, for thread safety.
return uCount;
}



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