IEnumVARIANT::Next - OLE Programmer's Reference

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IEnumVARIANT::Next

celt, rgvar, pceltFetched)
unsigned long celt
VARIANT FAR* rgvar
unsigned long FAR* pceltFetched

Attempts to get the next celt items in the enumeration sequence and return them through the array pointed to by rgvar.

Parameters
celt
The number of elements to be returned.

rgvar
An array of at least size celt in which the elements are to be returned.

pceltFetched
Pointer to the number of elements returned in rgvar, or NULL.

Return Value
The SCODE obtained from the returned HRESULT is one of the following:

SCODE	Meaning
S_OK	The number of elements returned is celt.
S_FALSE	The number of elements returned is less than celt.

Comments
If fewer than the requested number of elements remain in the sequence, return only the remaining elements; the actual number of elements returned is passed through *pceltFetched (unless it is NULL).

Example
The following code implements IEnumVariant::Next for collections in the Lines sample (ENUMVAR.CPP):

STDMETHODIMP

CEnumVariant::Next(ULONG cElements, VARIANT FAR* pvar, ULONG FAR* pcElementFetched)

{

HRESULT hr;

ULONG l;

long l1;

ULONG l2;

if (pcElementFetched != NULL)

pcElementFetched = 0;

for (l=0; l<cElements; l++)

VariantInit(&pvar[l]);

// Retrieve the next cElements elements.

for (l1=m_lCurrent, l2=0; l1<(long)(m_lLBound+m_cElements) &&

l2<cElements; l1++, l2++)

{

hr = SafeArrayGetElement(m_psa, &l1, &pvar[l2]);

if (FAILED(hr))

goto error;

}

// Set count of elements retrieved

if (pcElementFetched != NULL)

pcElementFetched = l2;

m_lCurrent = l1;

return (l2 < cElements) ? ResultFromScode(S_FALSE) : NOERROR;

error:

for (l=0; l<cElements; l++)

VariantClear(&pvar[l]);

return hr;

}

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