Factorio Forums

Posted: **Fri Jun 03, 2016 6:51 pm**

If armor slot is empty, it is valid for some reason. But you cannot access other fields of it.

script.on_event(defines.events.on_player_created,function(e)
    local p=game.players[e.player_index]
    local armor=p.get_inventory(defines.inventory.player_armor)[1]
    print (armor.valid)
    if not (armor and armor.valid and armor.has_grid) then 
         -this will give error
    end
end)

Code: Select all

Error while running the event handler: __Advanced_Personal_Defense__/control.lua:42: LuaItemStack API call when LuaItemStack was invalid

Posted: **Fri Jun 03, 2016 7:19 pm**

i think for itemstacks .valid_for_read is the way to check for validity

Posted: **Fri Jun 03, 2016 8:00 pm**

Choumiko wrote:i think for itemstacks .valid_for_read is the way to check for validity

Correct. The note in the docs about valid_for_read explain the difference and why .valid reports true but you get the error.

http://lua-api.factorio.com/0.12.35/Lua ... d_for_read

Is this valid for reading? Differs from the usual valid in that valid will be true even if the item stack is blank but the entity that holds it is still valid.

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[0.12.35] incorrect .valid return

[0.12.35] incorrect .valid return

Re: [0.12.35] incorrect .valid return

Re: [0.12.35] incorrect .valid return