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// EnumFormatEtc.cpp
#include "StdAfx.h"
#include "EnumFormatEtc.h"
#include "MyCom2.h"
class CEnumFormatEtc :
public IEnumFORMATETC,
public CMyUnknownImp
{
public:
MY_UNKNOWN_IMP1_MT(IEnumFORMATETC)
STDMETHOD(Next)(ULONG celt, FORMATETC *rgelt, ULONG *pceltFetched);
STDMETHOD(Skip)(ULONG celt);
STDMETHOD(Reset)(void);
STDMETHOD(Clone)(IEnumFORMATETC **ppEnumFormatEtc);
CEnumFormatEtc(const FORMATETC *pFormatEtc, ULONG numFormats);
~CEnumFormatEtc();
private:
LONG m_RefCount;
ULONG m_NumFormats;
FORMATETC *m_Formats;
ULONG m_Index;
};
static void DeepCopyFormatEtc(FORMATETC *dest, const FORMATETC *src)
{
*dest = *src;
if (src->ptd)
{
dest->ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
*(dest->ptd) = *(src->ptd);
}
}
CEnumFormatEtc::CEnumFormatEtc(const FORMATETC *pFormatEtc, ULONG numFormats)
{
m_RefCount = 1;
m_Index = 0;
m_NumFormats = 0;
m_Formats = new FORMATETC[numFormats];
// if (m_Formats)
{
m_NumFormats = numFormats;
for (ULONG i = 0; i < numFormats; i++)
DeepCopyFormatEtc(&m_Formats[i], &pFormatEtc[i]);
}
}
CEnumFormatEtc::~CEnumFormatEtc()
{
if (m_Formats)
{
for (ULONG i = 0; i < m_NumFormats; i++)
if (m_Formats[i].ptd)
CoTaskMemFree(m_Formats[i].ptd);
delete[]m_Formats;
}
}
STDMETHODIMP CEnumFormatEtc::Next(ULONG celt, FORMATETC *pFormatEtc, ULONG *pceltFetched)
{
ULONG copied = 0;
if (celt == 0 || pFormatEtc == 0)
return E_INVALIDARG;
while (m_Index < m_NumFormats && copied < celt)
{
DeepCopyFormatEtc(&pFormatEtc[copied], &m_Formats[m_Index]);
copied++;
m_Index++;
}
if (pceltFetched != 0)
*pceltFetched = copied;
return (copied == celt) ? S_OK : S_FALSE;
}
STDMETHODIMP CEnumFormatEtc::Skip(ULONG celt)
{
m_Index += celt;
return (m_Index <= m_NumFormats) ? S_OK : S_FALSE;
}
STDMETHODIMP CEnumFormatEtc::Reset(void)
{
m_Index = 0;
return S_OK;
}
STDMETHODIMP CEnumFormatEtc::Clone(IEnumFORMATETC ** ppEnumFormatEtc)
{
HRESULT hResult = CreateEnumFormatEtc(m_NumFormats, m_Formats, ppEnumFormatEtc);
if (hResult == S_OK)
((CEnumFormatEtc *)*ppEnumFormatEtc)->m_Index = m_Index;
return hResult;
}
// replacement for SHCreateStdEnumFmtEtc
HRESULT CreateEnumFormatEtc(UINT numFormats, const FORMATETC *formats, IEnumFORMATETC **enumFormat)
{
if (numFormats == 0 || formats == 0 || enumFormat == 0)
return E_INVALIDARG;
*enumFormat = new CEnumFormatEtc(formats, numFormats);
return (*enumFormat) ? S_OK : E_OUTOFMEMORY;
}
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