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COleSafeArray and cleanup thereof
I am using a COleSafeArray to transfer large quantities of data to an Excel sheet. I have coded a class to isolate the handling of Excel from the class I use it in (it will be used in more than one place ultimately)
Some code snippets.
in header
COleSafeArray m_sa;
in .cpp
//initialise safe array
DWORD dwElements[2];
dwElements[0]= iRows; //Number of rows
dwElements[1]= iCols; //Number of columns
m_sa.Create(VT_VARIANT, 2, dwElements);
....
//add a long to the safe array
long index[2];
index[0] = iRow;
index[1] = iCol;
COleVariant v((long)lItem);
m_sa.PutElement(index, v);
//OR a string LPCTSTR pszItem
long index[2];
index[0] = iRow;
index[1] = iCol;
COleVariant v(pszItem);
m_sa.PutElement(index, v);
....
//put the safe array to the sheet
m_pSheet->Range["A1:Z1"]->
//refill safe array with values for next row
m_pSheet->Range["A2:Z2"]->
and so on (there could be tens of thousands of rows in reality). The safe array is being reused, by that I mean I will call the PutElement with the same index many times.
So the question is: Do I need to cleanup the variants I put into the safearray before I put the next one into the array and if so how should the above code be modified?
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by: BigRatPosted on 2005-08-24 at 06:23:04ID: 14742190
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