API:SendUseItem

UI Lua API · Item functions
Version: WAR 1.4.8

Asks the server to use an item, optionally on another item.

SendUseItem(location, slot, option, targetLocation, targetSlot)

Arguments

location: number – Where the item is, as a GameData.ItemLocs value.
slot: number – Slot of the item in location, starting at 1.
option: number – Extra choice sent with the request, as a single byte. The stock UI passes 0, the 0-based index of a "use option" picked in a dialog, or an ability value for targeted uses.
targetLocation: number – Location of the target item, or 0 for no target.
targetSlot: number – Slot of the target item, or 0 for no target.

Nothing.

Supported locations are EQUIPPED, INVENTORY, QUEST_ITEM, INVENTORY_OVERFLOW, CRAFTING_ITEM and CURRENCY_ITEM. For any other location, including BANK, nothing is sent.
The target is converted the same way. An unsupported or 0 target location is sent as "no target".
The client does not check that the slot holds an item, or that the item can be used. The server decides.
If there is no player object, nothing happens.
The function needs at least five arguments and only reads the last five.

None besides the generic Invalid Parameters message when an argument is not a number.

Using an item from the backpack, from default/ea_backpackwindow/source/backpackutils.lua:

if not ItemUtils.ShowUseOptions(itemData, GameData.ItemLocs.INVENTORY, slot)
then
    SendUseItem( GameData.ItemLocs.INVENTORY, slot, 0, 0, 0 )
end

Using an item on another item, from default/ea_modifyitem/source/useitemtargeting.lua:

SendUseItem(sourceLoc, sourceSlot, ability, targetLoc, targetSlot)