How to get onhand quantity and value with x++ code

display qty OnHand()
{
    InventDim           inventDimCriteria;
    InventDimParm       inventDimParm;
    InventOnhand        inventOnhand = new InventOnhand();
    qty                 qty;
    ;
    //inventDimCriteria = inventDim;
    inventDimCriteria.InventLocationId  = inventDim.InventLocationId;
    inventDimCriteria.configId          = inventDim.configId;
    inventDimParm.initFromInventDim(inventDimCriteria);
    inventOnhand.parmInventDim(inventDimCriteria);
    inventOnhand.parmInventDimParm(inventDimParm);
    inventOnhand.parmItemId(inventTable.ItemId);
    Qty = inventOnhand.physicalInvent();
    OnHandQty = qty;
    return qty;
}