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108 lines
2.5 KiB
C++
Executable File
108 lines
2.5 KiB
C++
Executable File
// EnumFormatEtc.cpp
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#include "StdAfx.h"
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#include "EnumFormatEtc.h"
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#include "../../IDecl.h"
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#include "MyCom2.h"
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class CEnumFormatEtc Z7_final:
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public IEnumFORMATETC,
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public CMyUnknownImp
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{
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Z7_COM_UNKNOWN_IMP_1_MT(IEnumFORMATETC)
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STDMETHOD(Next)(ULONG celt, FORMATETC *rgelt, ULONG *pceltFetched) Z7_override;
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STDMETHOD(Skip)(ULONG celt) Z7_override;
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STDMETHOD(Reset)(void) Z7_override;
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STDMETHOD(Clone)(IEnumFORMATETC **ppEnumFormatEtc) Z7_override;
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LONG m_RefCount;
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ULONG m_NumFormats;
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FORMATETC *m_Formats;
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ULONG m_Index;
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public:
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CEnumFormatEtc(const FORMATETC *pFormatEtc, ULONG numFormats);
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~CEnumFormatEtc();
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};
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static void DeepCopyFormatEtc(FORMATETC *dest, const FORMATETC *src)
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{
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*dest = *src;
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if (src->ptd)
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{
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dest->ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
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*(dest->ptd) = *(src->ptd);
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}
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}
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CEnumFormatEtc::CEnumFormatEtc(const FORMATETC *pFormatEtc, ULONG numFormats)
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{
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m_RefCount = 1;
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m_Index = 0;
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m_NumFormats = 0;
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m_Formats = new FORMATETC[numFormats];
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// if (m_Formats)
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{
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m_NumFormats = numFormats;
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for (ULONG i = 0; i < numFormats; i++)
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DeepCopyFormatEtc(&m_Formats[i], &pFormatEtc[i]);
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}
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}
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CEnumFormatEtc::~CEnumFormatEtc()
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{
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if (m_Formats)
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{
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for (ULONG i = 0; i < m_NumFormats; i++)
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if (m_Formats[i].ptd)
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CoTaskMemFree(m_Formats[i].ptd);
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delete []m_Formats;
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}
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}
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Z7_COMWF_B CEnumFormatEtc::Next(ULONG celt, FORMATETC *pFormatEtc, ULONG *pceltFetched)
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{
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ULONG copied = 0;
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if (celt == 0 || !pFormatEtc)
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return E_INVALIDARG;
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while (m_Index < m_NumFormats && copied < celt)
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{
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DeepCopyFormatEtc(&pFormatEtc[copied], &m_Formats[m_Index]);
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copied++;
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m_Index++;
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}
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if (pceltFetched)
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*pceltFetched = copied;
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return (copied == celt) ? S_OK : S_FALSE;
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}
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Z7_COMWF_B CEnumFormatEtc::Skip(ULONG celt)
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{
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m_Index += celt;
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return (m_Index <= m_NumFormats) ? S_OK : S_FALSE;
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}
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Z7_COMWF_B CEnumFormatEtc::Reset(void)
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{
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m_Index = 0;
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return S_OK;
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}
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Z7_COMWF_B CEnumFormatEtc::Clone(IEnumFORMATETC ** ppEnumFormatEtc)
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{
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HRESULT hResult = CreateEnumFormatEtc(m_NumFormats, m_Formats, ppEnumFormatEtc);
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if (hResult == S_OK)
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((CEnumFormatEtc *)*ppEnumFormatEtc)->m_Index = m_Index;
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return hResult;
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}
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// replacement for SHCreateStdEnumFmtEtc
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HRESULT CreateEnumFormatEtc(UINT numFormats, const FORMATETC *formats, IEnumFORMATETC **enumFormat)
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{
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if (numFormats == 0 || !formats || !enumFormat)
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return E_INVALIDARG;
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*enumFormat = new CEnumFormatEtc(formats, numFormats);
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return (*enumFormat) ? S_OK : E_OUTOFMEMORY;
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}
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