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CArray <CStyle *, CStyle *> m_aStyles;

...

#define RETURN_TRUE  return *bOk = TRUE, S_OK
#define RETURN_FALSE return *bOk = FALSE, S_FALSE
#define RETURN_ERROR(E) \
	return LastErrorCode = (ERROR_##E), *bOk = FALSE, S_FALSE

...

// Создание нового стиля (пустого)
STDMETHODIMP CEffector::AddStyle(VARIANT_BOOL *bOk)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState())
	
	CStyle *pNew = new CStyle;
	if (pNew)
	{
		INT n = m_aStyles.GetSize();
		m_aStyles.Add(pNew);
		if (m_aStyles.GetSize() <= n)
			RETURN_ERROR(MEMORY);
	}
	else
		RETURN_ERROR(MEMORY);
	RETURN_TRUE;
}

...

// Получение кода ошибки
STDMETHODIMP CEffector::GetErrorCode(long *p)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState())

	*p = LastErrorCode;
	LastErrorCode = ERROR_NONE;
	return S_OK;
}