mirror of
https://github.com/reactos/reactos.git
synced 2024-11-20 14:30:57 +00:00
100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
/*
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* PROJECT: ReactOS Compatibility Layer Shell Extension
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* PURPOSE: CLayerStringList implementation
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* COPYRIGHT: Copyright 2015-2017 Mark Jansen (mark.jansen@reactos.org)
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*/
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/* TODO: Use HSDB instead of PDB */
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class CLayerStringList :
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public CComObjectRootEx<CComMultiThreadModelNoCS>,
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public IEnumString
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{
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public:
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CLayerStringList()
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:m_root(TAGID_NULL), m_layer(TAGID_NULL)
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{
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WCHAR buf[MAX_PATH];
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SdbGetAppPatchDir(NULL, buf, MAX_PATH);
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StringCchCatW(buf, _countof(buf), L"\\sysmain.sdb");
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m_db = SdbOpenDatabase(buf, DOS_PATH);
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Reset();
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}
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~CLayerStringList()
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{
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SdbCloseDatabase(m_db);
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}
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virtual HRESULT STDMETHODCALLTYPE Next(ULONG celt, LPOLESTR *rgelt, ULONG *pceltFetched)
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{
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if (pceltFetched)
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*pceltFetched = 0;
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while (celt && m_layer)
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{
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TAGID nameid = SdbFindFirstTag(m_db, m_layer, TAG_NAME);
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if (!nameid)
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return S_FALSE;
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LPWSTR name = SdbGetStringTagPtr(m_db, nameid);
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if (!name)
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return S_FALSE;
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ULONG Size = wcslen(name) + 1;
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*rgelt = (LPOLESTR)::CoTaskMemAlloc(Size * sizeof(WCHAR));
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StringCchCopyW(*rgelt, Size, name);
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if (pceltFetched)
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(*pceltFetched)++;
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m_layer = SdbFindNextTag(m_db, m_root, m_layer);
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celt--;
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rgelt++;
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}
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return celt ? S_FALSE : S_OK;
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}
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virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt)
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{
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while (m_layer && celt)
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{
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m_layer = SdbFindNextTag(m_db, m_root, m_layer);
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--celt;
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}
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return celt ? S_FALSE : S_OK;
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}
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virtual HRESULT STDMETHODCALLTYPE Reset()
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{
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m_root = m_layer = TAGID_NULL;
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if (m_db)
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{
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m_root = SdbFindFirstTag(m_db, TAGID_ROOT, TAG_DATABASE);
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if (m_root != TAGID_NULL)
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{
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m_layer = SdbFindFirstTag(m_db, m_root, TAG_LAYER);
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return S_OK;
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}
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}
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return E_FAIL;
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}
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virtual HRESULT STDMETHODCALLTYPE Clone(IEnumString **ppenum)
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{
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return E_NOTIMPL;
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}
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protected:
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PDB m_db;
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TAGID m_root;
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TAGID m_layer;
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public:
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BEGIN_COM_MAP(CLayerStringList)
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COM_INTERFACE_ENTRY_IID(IID_IEnumString, IEnumString)
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END_COM_MAP()
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};
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