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CListCtrl::GetItemData

Retrieves the 32-bit application-specific value associated with the item specified by nItem.

DWORD_PTR GetItemData( 
   int nItem  
) const;

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);
   }
}

Header: afxcmn.h

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