troubleshooting Question

COleSafeArray and cleanup thereof

Avatar of AndyAinscow
AndyAinscowFlag for Switzerland asked on
System Programming
3 Comments1 Solution594 ViewsLast Modified:
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"]->Value = m_sa;
//refill safe array with values for next row
      m_pSheet->Range["A2:Z2"]->Value = m_sa;
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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