74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
// Copyright (c) 1997 Microsoft Corporation. All Rights Reserved.
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#include "stdafx.h"
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#include "project.h"
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CMediaTypeEnum::CMediaTypeEnum() :
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m_cCurrentPos(0),
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m_pStream(NULL)
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{
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}
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void CMediaTypeEnum::Initialize(CStream *pStream, ULONG cCurPos)
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{
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m_pStream = pStream;
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m_pStream->GetControllingUnknown()->AddRef();
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m_cCurrentPos = cCurPos;
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}
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CMediaTypeEnum::~CMediaTypeEnum()
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{
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m_pStream->GetControllingUnknown()->Release();
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}
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STDMETHODIMP CMediaTypeEnum::Next(ULONG cNumToFetch, AM_MEDIA_TYPE **ppMediaTypes, ULONG *pcFetched)
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{
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if (pcFetched == NULL) {
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return E_POINTER;
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}
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HRESULT hr = S_OK;
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*pcFetched = 0;
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for (; cNumToFetch > 0; ) {
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if (S_OK == hr) {
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hr = m_pStream->GetMediaType(m_cCurrentPos, ppMediaTypes);
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if (S_OK != hr) {
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*ppMediaTypes = NULL;
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} else {
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m_cCurrentPos++;
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(*pcFetched)++;
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}
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}
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ppMediaTypes++;
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cNumToFetch--;
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}
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return hr;
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}
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STDMETHODIMP CMediaTypeEnum::Skip(ULONG cSkip)
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{
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m_cCurrentPos += cSkip;
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return NOERROR;
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}
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STDMETHODIMP CMediaTypeEnum::Reset()
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{
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m_cCurrentPos = 0;
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return NOERROR;
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}
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STDMETHODIMP CMediaTypeEnum::Clone(IEnumMediaTypes **ppEnumMediaTypes)
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{
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HRESULT hr = S_OK;
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CMediaTypeEnum *pNewEnum = new CComObject<CMediaTypeEnum>;
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if (pNewEnum == NULL) {
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hr = E_OUTOFMEMORY;
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} else {
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pNewEnum->Initialize(m_pStream, m_cCurrentPos);
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}
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pNewEnum->GetControllingUnknown()->QueryInterface(IID_IEnumMediaTypes, (void **)ppEnumMediaTypes);
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return hr;
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}
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