How to check Grand Exchange Slot for name,price,offer type?

[theknig 4]

I want when my script starts to check each slot indiviually and see their names, how much the offer is for, and if it is a sell or buy offer. 

I tried to open the slot using 

 

GrandExchange.openSlotInterface(1);
sleep(1000);
MethodProvider.log(GrandExchange.getCurrentChosenItemID());

but its returning -1 it only works when I am creating an offer not when an offer is already placed. I would appreciate any help in this.

Edit:
I found the solution

 

        GrandExchangeItem[] ge = GrandExchange.getItems();

        for (int i = 0; i<ge.length;i++){
            MethodProvider.log(ge[i].getName());
        }

Will go through each slot and get their names.