127 lines
2.8 KiB
C++
127 lines
2.8 KiB
C++
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/////////////////////////////////////////////////////////////////////////////
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//
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// Copyright: Microsoft Corp. 1997-1999. All rights reserved
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//
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/////////////////////////////////////////////////////////////////////////////
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// Log.cpp : Implementation of CLog
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#include "stdafx.h"
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#include "Evntutl.h"
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#include "Log.h"
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/////////////////////////////////////////////////////////////////////////////
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// CLog
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STDMETHODIMP CLog::InterfaceSupportsErrorInfo(REFIID riid)
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{
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static const IID* arr[] =
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{
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&IID_ILog
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};
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for (int i=0; i < sizeof(arr) / sizeof(arr[0]); i++)
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{
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if (InlineIsEqualGUID(*arr[i],riid))
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return S_OK;
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}
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return S_FALSE;
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}
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/*
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Function: get_Events
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Inputs: empty variant pointer
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Outputs: variant dispatch pointer to a filled Events collection
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Purpose: provide access to IEvents interface, open an event log if not already open
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Notes: This op is very expensive when calling m_pEvents->Init()
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*/
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STDMETHODIMP CLog::get_Events(VARIANT *pVal)
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{
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HRESULT hr = S_OK;
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VariantInit(pVal);
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IDispatch* pDisp;
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m_pEvents->QueryInterface (IID_IDispatch, (void**) &pDisp);
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pVal->vt = VT_DISPATCH;
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pVal->pdispVal = pDisp;
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// Need to open the log before users can start retreiving events.
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if (!m_Name) hr = E_INVALIDARG;
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else
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{
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if (!m_hLog) // if removed, calling Log.Events will refresh the collection
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{
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m_hLog = OpenEventLog(m_ServerName, m_Name);
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if (m_hLog) m_pEvents->Init(m_hLog, m_Name);
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else hr = E_HANDLE;
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}
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}
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return hr;
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}
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/*
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Function: get_Name
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Inputs: empty BSTR
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Outputs: BSTR containing the name of the EventLog
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Purpose: Allows user to access the name of the active EventLog
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*/
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STDMETHODIMP CLog::get_Name(BSTR *pVal)
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{
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HRESULT hr = S_OK;
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if (pVal) *pVal = m_Name.copy();
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else hr = E_POINTER;
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return hr;
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}
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/*
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Function: get_Server
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Inputs: empty BSTR
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Outputs: BSTR containing the name of the server for the EventLog
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Purpose: Allows user to access the name of the active Server
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*/
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STDMETHODIMP CLog::get_Server(BSTR *pVal)
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{
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HRESULT hr = S_OK;
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if (pVal) *pVal = m_ServerName.copy();
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else hr = E_POINTER;
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return hr;
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}
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/*
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Function: put_Server
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Inputs: BSTR containing the name of the server for the EventLog
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Outputs: HRESULT showing error code in case of failure, does not change input
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Purpose: Allows user to alter the name of the active Server
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*/
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STDMETHODIMP CLog::put_Server(BSTR newVal)
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{
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m_ServerName = newVal;
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return S_OK;
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}
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/*
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Function: Clear
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Inputs: none
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Outputs: HRESULT showing error code in case of failure
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Purpose: Allows user to wipe EventLog clean
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Note: The function does NOT backup the EventLog first
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*/
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STDMETHODIMP CLog::Clear()
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{
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HRESULT hr = S_OK;
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if (!m_hLog) m_hLog = OpenEventLog(m_ServerName, m_Name);
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if (m_hLog)
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{
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if (ClearEventLog(m_hLog, NULL)) m_hLog = NULL;
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else hr = E_FAIL;
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}
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else hr = E_HANDLE;
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return hr;
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}
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