//
// Constructor
//
CEnumFormatEtc::CEnumFormatEtc(FORMATETC *pFormatEtc, int nNumFormats)
{
m_lRefCount = 1;
m_nIndex = 0;
m_nNumFormats = nNumFormats;
m_pFormatEtc = new FORMATETC[nNumFormats];
// copy the FORMATETC structures
for (int i = 0; i < nNumFormats; i++) {
DeepCopyFormatEtc(&m_pFormatEtc[i], &pFormatEtc[i]);
}
}
DragEnumFormatEtc::DragEnumFormatEtc(FORMATETC* pFormatEtc, int nNumFormats) {
AddRef();
m_nIndex = 0;
m_nNumFormats = nNumFormats;
m_pFormatEtc = new FORMATETC[nNumFormats];
// make a new copy of each FORMATETC structure
for (int i = 0; i < nNumFormats; i++) {
DeepCopyFormatEtc(&m_pFormatEtc[i], &pFormatEtc[i]);
}
}
//
// Constructor
//
CEnumFormatEtc::CEnumFormatEtc(FORMATETC *pFormatEtc, int nNumFormats)
{
m_lRefCount = 1;
m_nIndex = 0;
m_nNumFormats = nNumFormats;
m_pFormatEtc = nNumFormats ? (FORMATETC*)calloc(nNumFormats, sizeof(FORMATETC)) : NULL;
// copy the FORMATETC structures
for (int i = 0; i < nNumFormats; i++)
{
DeepCopyFormatEtc(&m_pFormatEtc[i], &pFormatEtc[i]);
}
}
HRESULT CEnumFormatEtc::Next(ULONG celt, FORMATETC *pFormatEtc, ULONG *pceltFetched)
{
ULONG copied = 0;
// copy the FORMATETC structures into the caller's buffer
while (m_nIndex < m_nNumFormats && copied < celt)
{
DeepCopyFormatEtc(&pFormatEtc [copied], &m_pFormatEtc [m_nIndex]);
copied++;
m_nIndex++;
}
// store result
if(pceltFetched != 0)
*pceltFetched = copied;
// did we copy all that was requested?
return (copied == celt) ? S_OK : S_FALSE;
}
//
// IEnumFORMATETC::Next
//
// If the returned FORMATETC structure contains a non-null "ptd" member, then
// the caller must free this using CoTaskMemFree (stated in the COM documentation)
//
HRESULT __stdcall CEnumFormatEtc::Next(ULONG celt, FORMATETC *pFormatEtc, ULONG * pceltFetched)
{
ULONG copied = 0;
// validate arguments
if (celt == 0 || pFormatEtc == 0)
return E_INVALIDARG;
// copy FORMATETC structures into caller's buffer
while (m_nIndex < m_nNumFormats && copied < celt) {
DeepCopyFormatEtc(&pFormatEtc[copied], &m_pFormatEtc[m_nIndex]);
copied++;
m_nIndex++;
}
// store result
if (pceltFetched != 0)
*pceltFetched = copied;
// did we copy all that was requested?
return (copied == celt) ? S_OK : S_FALSE;
}
