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/////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2000 John Adcock. All rights reserved.
/////////////////////////////////////////////////////////////////////////////
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// This library is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
// License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with this library; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// The id3lib authors encourage improvements and optimisations to be sent to
// the id3lib coordinator. Please see the README file for details on where to
// send such submissions. See the AUTHORS file for a list of people who have
// contributed to id3lib. See the ChangeLog file for a list of changes to
// id3lib. These files are distributed with id3lib at
// http://download.sourceforge.net/id3lib/
//
/////////////////////////////////////////////////////////////////////////////
// EnumFields.cpp : Implementation of DLL Exports.
/////////////////////////////////////////////////////////////////////////////
// Change Log
//
// Date Developer Changes
//
// 05 Jan 2000 John Adcock Original Release
// 26 Apr 2000 John Adcock Got working with id3lib 3.7.3
//
/////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "ID3COM.h"
#include "EnumFields.h"
#include <comdef.h>
/////////////////////////////////////////////////////////////////////////////
// CEnumFields
CEnumFields::CEnumFields()
{
m_Tag = NULL;
m_CurrentNum = 0;
}
CEnumFields::~CEnumFields()
{
if(m_Tag != NULL)
{
m_Tag->Release();
}
}
IEnumVARIANT* CEnumFields::CreateObject(IID3ComTag* Tag)
{
CComObject<CEnumFields>* pRetVal = new CComObject<CEnumFields>;
pRetVal->m_Tag = Tag;
pRetVal->m_Tag->AddRef();
return pRetVal;
}
STDMETHODIMP CEnumFields::Next(ULONG celt, VARIANT* rgelt, ULONG * pceltFetched)
{
long NumItems;
m_Tag->get_Count(&NumItems);
for(long i(0); i < (long)((pceltFetched==NULL)?1:(*pceltFetched)); i++)
{
if(m_CurrentNum + i >= NumItems)
{
return S_FALSE;
}
else
{
IID3ComFrame* Frame;
m_Tag->get_Item(m_CurrentNum + i, &Frame);
*(_variant_t*)rgelt = Frame;
Frame->Release();
rgelt++;
}
}
m_CurrentNum += ((pceltFetched==NULL)?1:(*pceltFetched));
return S_OK;
}
STDMETHODIMP CEnumFields::Skip(ULONG celt)
{
m_CurrentNum += celt;
return S_OK;
}
STDMETHODIMP CEnumFields::Reset(void)
{
m_CurrentNum = 0;
return S_OK;
}
STDMETHODIMP CEnumFields::Clone(IEnumVARIANT ** ppenum)
{
CComObject<CEnumFields>* pRetVal = new CComObject<CEnumFields>;
pRetVal->m_Tag = m_Tag;
pRetVal->m_CurrentNum = m_CurrentNum;
pRetVal->m_Tag->AddRef();
*ppenum = pRetVal;
return S_OK;
}
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