114 lines
2.7 KiB
C++
114 lines
2.7 KiB
C++
//////////////////////////////////////////
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// filters.h : header for CFilters IEnumFilters implementation on
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// top of stl vector of filters
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// copyright (c) 1999 Microsoft Corp.
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#pragma once
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#ifndef FILTERS_H_
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#define FILTERS_H_
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#include <vector>
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#include <dsextend.h>
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#include <objectwithsiteimplsec.h>
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class ATL_NO_VTABLE CFilterEnumOnDSFilterListBase : public CComObjectRootEx<CComSingleThreadModel>,
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public IEnumFilters,
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public IObjectWithSiteImplSec<CFilterEnumOnDSFilterListBase>
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{
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BEGIN_COM_MAP(CFilterEnumOnDSFilterListBase)
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COM_INTERFACE_ENTRY(IEnumFilters)
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COM_INTERFACE_ENTRY(IObjectWithSite)
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END_COM_MAP()
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DECLARE_PROTECT_FINAL_CONSTRUCT()
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virtual ~CFilterEnumOnDSFilterListBase() {}
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};
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/////////////////////////////////////////////////////////////////////////////
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// CFilters
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class CFilterEnumOnDSFilterList : public CComObject<CFilterEnumOnDSFilterListBase>
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{
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public:
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CFilterEnumOnDSFilterList(DSFilterList &Fi) : m_Filters(Fi) {
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i = m_Filters.begin();
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}
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CFilterEnumOnDSFilterList(CFilterEnumOnDSFilterList &orig) : m_Filters(orig.m_Filters) {
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i = m_Filters.begin();
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DSFilterList::iterator i2 = orig.m_Filters.begin();
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for (; i2 != orig.i && i2 != orig.m_Filters.end(); ++i, ++i2);
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}
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virtual ~CFilterEnumOnDSFilterList() {
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m_Filters.clear();
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}
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// IDevEnum
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public:
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DSFilterList m_Filters;
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DSFilterList::iterator i;
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// IEnumVARIANT
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STDMETHOD(Next)(ULONG celt, IBaseFilter **pOutF, ULONG * pceltFetched)
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{
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// pceltFetched can legally == 0
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//
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if (pceltFetched != NULL) {
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try {
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*pceltFetched = 0;
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} catch(...) {
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return E_POINTER;
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}
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}
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HRESULT hr = NOERROR ;
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try {
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// Retrieve the next celt elements.
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for (;i != m_Filters.end() && celt != 0; ++i, --celt, ++pOutF) {
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hr = (*i).CopyTo(pOutF);
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if (FAILED(hr)){
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return hr;
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}
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if (pceltFetched != NULL) {
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(*pceltFetched)++ ;
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}
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}
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} catch(...) {
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return E_POINTER;
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}
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if (celt != 0) {
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hr = ResultFromScode( S_FALSE ) ;
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}
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return hr;
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}
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STDMETHOD(Skip)(ULONG celt)
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{
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for (;i != m_Filters.end() && celt--; ++i);
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return (celt == 0 ? NOERROR : ResultFromScode( S_FALSE )) ;
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}
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STDMETHOD(Reset)()
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{
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i = m_Filters.begin();
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return NOERROR;
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}
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STDMETHOD(Clone)(IEnumFilters **ppenum)
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{
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if (ppenum == NULL)
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return E_POINTER;
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PQEnumFilters temp;
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try {
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temp = new CFilterEnumOnDSFilterList(*this);
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} catch(...) {
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return E_OUTOFMEMORY;
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}
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try {
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*ppenum = temp.Detach();
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} catch(...) {
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return E_POINTER;
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}
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return NOERROR;
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}
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};
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#endif
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//end of file filters.h
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