130 lines
2.6 KiB
C++
130 lines
2.6 KiB
C++
//____________________________________________________________________________
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1997 - 1999
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//
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// File: TaskEnum.cpp
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//
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// Contents:
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//
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// Classes:
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//
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// Functions:
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//
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// History: 11/19/1997 RaviR Created
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//____________________________________________________________________________
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//
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#include "stdafx.h"
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#include "taskenum.h"
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CTaskEnumerator::~CTaskEnumerator()
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{
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POSITION pos = m_list.GetHeadPosition();
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while (pos)
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{
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STaskEnums& rte = m_list.GetNext(pos);
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rte.pET->Release();
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}
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m_list.RemoveAll();
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}
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bool
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CTaskEnumerator::AddTaskEnumerator(
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const CLSID& clsid,
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IEnumTASK* pEnumTASK)
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{
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ASSERT(pEnumTASK != NULL);
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if (pEnumTASK == NULL)
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return false;
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STaskEnums te;
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te.clsid = clsid;
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te.pET = pEnumTASK;
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m_list.AddTail(te);
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pEnumTASK->AddRef();
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if (m_posCurr == NULL)
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m_posCurr = m_list.GetHeadPosition();
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return true;
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}
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STDMETHODIMP
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CTaskEnumerator::Next(
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ULONG celt,
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MMC_TASK *rgelt,
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ULONG *pceltFetched)
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{
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ASSERT(celt == 1);
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if (celt != 1)
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return E_INVALIDARG;
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ASSERT(rgelt != NULL);
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if (rgelt == NULL)
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return E_POINTER;
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// init
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if (pceltFetched != NULL)
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*pceltFetched = 0;
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if (m_posCurr == NULL)
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return S_FALSE;
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HRESULT hr = S_FALSE;
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while (m_posCurr != NULL)
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{
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STaskEnums& rte = m_list.GetAt(m_posCurr);
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ASSERT(&rte != NULL);
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ULONG celtFetched = 0;
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hr = rte.pET->Next(1, rgelt, &celtFetched);
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ASSERT(SUCCEEDED(hr));
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if (pceltFetched)
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*pceltFetched = celtFetched;
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#ifdef DBG
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if (hr == S_FALSE) { ASSERT(celtFetched == 0); }
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#endif // DBG
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if (hr == S_OK)
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{
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MMC_ITASK* pTASK = reinterpret_cast<MMC_ITASK*>(rgelt);
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hr = ::StringFromCLSID(rte.clsid, &(pTASK->szClsid));
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ASSERT(SUCCEEDED(hr));
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break;
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}
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else if (FAILED(hr))
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{
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// continue if the snapin failed enum tasks
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hr = S_FALSE;
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}
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m_list.GetNext(m_posCurr);
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}
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return hr;
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}
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STDMETHODIMP
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CTaskEnumerator::Reset()
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{
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POSITION pos = m_list.GetHeadPosition();
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while (pos != NULL && pos != m_posCurr)
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{
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STaskEnums& rte = m_list.GetNext(pos);
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ASSERT(&rte != NULL);
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rte.pET->Reset();
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}
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m_posCurr = m_list.GetHeadPosition();
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return S_OK;
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}
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