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Retrieves the 32-bit application-specific value associated with the item specified by nItem.
Index of the list item whose data is to be retrieved.
A 32-bit application-specific value associated with the specified item.
This value is the lParam member of the LVITEM structure, as described in the Windows SDK
// If any item's data is equal to zero then reset it to -1.
for (int i=0; i < m_myListCtrl.GetItemCount(); i++)
if (m_myListCtrl.GetItemData(i) == 0)
m_myListCtrl.SetItemData(i, (DWORD) -1);
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