mirror of
https://github.com/OPCFoundation/UA-.NETStandard.git
synced 2026-10-28 22:55:49 +08:00
160 lines
4.0 KiB
C++
160 lines
4.0 KiB
C++
/* ========================================================================
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* Copyright (c) 2005-2019 The OPC Foundation, Inc. All rights reserved.
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*
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* OPC Foundation MIT License 1.00
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* The complete license agreement can be found here:
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* http://opcfoundation.org/License/MIT/1.00/
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* ======================================================================*/
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#include "StdAfx.h"
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#include "COpcEnumUnknown.h"
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//==============================================================================
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// COpcEnumUnknown
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COpcEnumUnknown::COpcEnumUnknown()
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{
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m_uIndex = 0;
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m_uCount = 0;
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m_pUnknowns = NULL;
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}
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// Constructor
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COpcEnumUnknown::COpcEnumUnknown(UINT uCount, IUnknown**& pUnknowns)
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{
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m_uIndex = 0;
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m_uCount = uCount;
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m_pUnknowns = pUnknowns;
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// take ownership of memory.
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pUnknowns = NULL;
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}
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// Destructor
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COpcEnumUnknown::~COpcEnumUnknown()
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{
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for (UINT ii = 0; ii < m_uCount; ii++)
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{
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if (m_pUnknowns[ii] != NULL) m_pUnknowns[ii]->Release();
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}
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OpcFree(m_pUnknowns);
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}
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//==============================================================================
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// IEnumUnknown
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// Next
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HRESULT COpcEnumUnknown::Next(
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ULONG celt,
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IUnknown** rgelt,
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ULONG* pceltFetched
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)
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{
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// check for invalid arguments.
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if (rgelt == NULL || pceltFetched == NULL)
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{
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return E_INVALIDARG;
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}
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*pceltFetched = NULL;
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// all strings already returned.
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if (m_uIndex >= m_uCount)
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{
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return S_FALSE;
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}
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// copy strings.
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for (UINT ii = m_uIndex; ii < m_uCount && *pceltFetched < celt; ii++)
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{
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rgelt[*pceltFetched] = m_pUnknowns[ii];
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if (m_pUnknowns[ii] != NULL) m_pUnknowns[ii]->AddRef();
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(*pceltFetched)++;
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}
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// no enough strings left.
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if (*pceltFetched < celt)
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{
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m_uIndex = m_uCount;
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return S_FALSE;
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}
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m_uIndex = ii;
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return S_OK;
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}
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// Skip
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HRESULT COpcEnumUnknown::Skip(ULONG celt)
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{
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if (m_uIndex + celt > m_uCount)
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{
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m_uIndex = m_uCount;
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return S_FALSE;
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}
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m_uIndex += celt;
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return S_OK;
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}
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// Reset
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HRESULT COpcEnumUnknown::Reset()
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{
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m_uIndex = 0;
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return S_OK;
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}
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// Clone
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HRESULT COpcEnumUnknown::Clone(IEnumUnknown** ppEnum)
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{
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// check for invalid arguments.
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if (ppEnum == NULL)
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{
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return E_INVALIDARG;
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}
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// allocate enumerator.
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COpcEnumUnknown* pEnum = new COpcEnumUnknown();
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// copy strings.
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pEnum->m_pUnknowns = OpcArrayAlloc(IUnknown*, m_uCount);
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for (UINT ii = 0; ii < m_uCount; ii++)
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{
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pEnum->m_pUnknowns[ii] = m_pUnknowns[ii];
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if (m_pUnknowns[ii] != NULL) m_pUnknowns[ii]->AddRef();
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}
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// set index.
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pEnum->m_uIndex = m_uIndex;
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pEnum->m_uCount = m_uCount;
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HRESULT hResult = pEnum->QueryInterface(IID_IEnumUnknown, (void**)ppEnum);
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// release local reference.
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pEnum->Release();
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return hResult;
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}
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