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185 lines
3.4 KiB
185 lines
3.4 KiB
/*++
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Copyright (c) 1985 - 1999, Microsoft Corporation
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Module Name:
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enum.cpp
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Abstract:
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This file implements the IEnumInputContext Class.
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Author:
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Revision History:
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Notes:
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--*/
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#include "private.h"
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#include "enum.h"
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//+---------------------------------------------------------------------------
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//
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// QueryInterface
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//
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//----------------------------------------------------------------------------
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HRESULT
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CEnumInputContext::QueryInterface(
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REFIID riid,
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void **ppvObj
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)
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{
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if (ppvObj == NULL)
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return E_INVALIDARG;
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*ppvObj = NULL;
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if (IsEqualIID(riid, IID_IUnknown) ||
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IsEqualIID(riid, IID_IEnumInputContext))
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{
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*ppvObj = SAFECAST(this, IEnumInputContext *);
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}
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if (*ppvObj)
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{
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AddRef();
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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//+---------------------------------------------------------------------------
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//
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// AddRef
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//
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//----------------------------------------------------------------------------
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ULONG
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CEnumInputContext::AddRef()
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{
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return ++_cRef;
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}
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//+---------------------------------------------------------------------------
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//
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// Release
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//
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//----------------------------------------------------------------------------
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ULONG
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CEnumInputContext::Release()
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{
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LONG cr = --_cRef;
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Assert(_cRef >= 0);
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if (_cRef == 0)
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{
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delete this;
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}
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return cr;
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}
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//+---------------------------------------------------------------------------
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//
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// Clone
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//
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//----------------------------------------------------------------------------
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HRESULT
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CEnumInputContext::Clone(
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IEnumInputContext** ppEnum
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)
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{
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if (ppEnum == NULL)
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return E_INVALIDARG;
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*ppEnum = NULL;
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CEnumInputContext* pClone;
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if ((pClone = new CEnumInputContext(_list)) == NULL)
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return E_OUTOFMEMORY;
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*ppEnum = pClone;
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return S_OK;
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}
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//+---------------------------------------------------------------------------
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//
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// Next
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//
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//----------------------------------------------------------------------------
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HRESULT
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CEnumInputContext::Next(
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ULONG ulCount,
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HIMC* rgInputContext,
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ULONG* pcFetched
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)
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{
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if (rgInputContext == NULL)
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return E_INVALIDARG;
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ULONG cFetched;
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if (pcFetched == NULL)
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pcFetched = &cFetched;
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if (_pos == NULL) {
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*pcFetched = 0;
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return S_FALSE;
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}
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for (*pcFetched = 0; *pcFetched < ulCount; *pcFetched++, rgInputContext++) {
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_list.GetNextHimc(_pos, rgInputContext);
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if (_pos == NULL)
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break;
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}
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return S_OK;
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}
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//+---------------------------------------------------------------------------
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//
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// Reset
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//
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//----------------------------------------------------------------------------
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HRESULT
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CEnumInputContext::Reset(
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)
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{
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_pos = _list.GetStartPosition();
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return S_OK;
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}
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//+---------------------------------------------------------------------------
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//
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// Skip
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//
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//----------------------------------------------------------------------------
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HRESULT
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CEnumInputContext::Skip(
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ULONG ulCount
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)
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{
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POSITION backup = _pos;
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while (ulCount--) {
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HIMC imc;
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_list.GetNextHimc(_pos, &imc);
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if (_pos == NULL) {
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_pos = backup;
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return S_FALSE;
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}
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}
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return S_OK;
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}
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