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#include "dataobj.h"
CEnumFormatEtc::CEnumFormatEtc(
LPUNKNOWN pUnkRef,
ULONG cFE,
LPFORMATETC prgFE
)
{
UINT i;
m_cRef = 0;
m_pUnkRef = pUnkRef;
m_iCur = 0;
m_cfe = cFE;
m_prgfe = new FORMATETC[ (UINT) cFE ];
if (NULL != m_prgfe)
{
for(i=0; i<cFE; i++)
m_prgfe[i] = prgFE[i];
}
return;
}
CEnumFormatEtc::~CEnumFormatEtc(void)
{
if (NULL != m_prgfe)
delete [] m_prgfe;
return;
}
STDMETHODIMP
CEnumFormatEtc::QueryInterface(
REFIID riid,
LPLPVOID ppv
)
{
*ppv = NULL;
if(IsEqualIID(riid, IID_IUnknown)
|| IsEqualIID(riid, IID_IEnumFORMATETC))
{
*ppv = (LPVOID) this;
}
if (NULL != *ppv)
{
((LPUNKNOWN)*ppv)->AddRef();
return NOERROR;
}
return ResultFromScode(E_NOINTERFACE);
}
STDMETHODIMP_(ULONG)
CEnumFormatEtc::AddRef(void)
{
++m_cRef;
m_pUnkRef->AddRef();
return m_cRef;
}
STDMETHODIMP_(ULONG)
CEnumFormatEtc::Release(void)
{
ULONG cRefT;
cRefT = --m_cRef;
if (0 == m_cRef)
delete this;
return cRefT;
}
STDMETHODIMP
CEnumFormatEtc::Next(
ULONG cFE,
LPFORMATETC pFE,
ULONG FAR *pulFE
)
{
ULONG cReturn = 0L;
if (NULL == m_prgfe)
return ResultFromScode(S_FALSE);
if (NULL == pulFE)
{
if (1L != cFE)
return ResultFromScode(E_POINTER);
}
else
*pulFE = 0L;
if (NULL == pFE || m_iCur >= m_cfe)
return ResultFromScode(S_FALSE);
while ( (m_iCur < m_cfe) && (cFE > 0) )
{
*pFE++ = m_prgfe[m_iCur++];
++cReturn;
--cFE;
}
if (NULL != pulFE)
*pulFE = cReturn;
return NOERROR;
}
STDMETHODIMP
CEnumFormatEtc::Skip(
ULONG cSkip
)
{
if ( ( (m_iCur+cSkip) > m_cfe) || (NULL == m_prgfe) )
return ResultFromScode(S_FALSE);
m_iCur += cSkip;
return NOERROR;
}
STDMETHODIMP
CEnumFormatEtc::Reset(void)
{
m_iCur = 0;
return NOERROR;
}
STDMETHODIMP
CEnumFormatEtc::Clone(
LPENUMFORMATETC FAR *ppEnum
)
{
PCEnumFormatEtc pNew;
*ppEnum = NULL;
pNew = new CEnumFormatEtc(m_pUnkRef, m_cfe, m_prgfe);
if (NULL == pNew)
return ResultFromScode(E_OUTOFMEMORY);
pNew->AddRef();
pNew->m_iCur = m_iCur;
*ppEnum = pNew;
return NOERROR;
}
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