Count returns the number of filtered columns in the current range. Items[Field] returns a TXLSAutofilterItem for that field or nil when the field index is outside the current range.
Active, Operator, Criteria1, and Criteria2. Criteria objects expose the stored BIFF8 DOPER DataType, grbitSgn, and Value.
Sheet.ApplyAutoFilter('A1:C5', 2, '>=100');
FilterItem := Sheet.AutoFilterColumns[2];
if Assigned(FilterItem) and FilterItem.Active then
CriteriaValue := FilterItem.Criteria1.Value;