Error in inventory Script

[tripper1977]

hello all i have been following Jorn Theunissen inventory script on youtube and keep geting this error

 

attempt to index field 'context' (a nil value)

 

can any one help please thank you

[macklebee]

You are going to have to give more information than that. Please post the script in question that is causing the error. While Jorn's videos are probably top notch, please be advised these are 3rd party scripts/video tutorials that are not officially supported by Leadwerks. So if you are having problems, its best to post the code along with the description of the problem.

 

In any case, anytime you see the error 'index field 'xxxxxx' (a nil value)', it typically means that 'xxxxxx' has not been defined prior to you trying to use any of its associated class methods/functions.

[tripper1977]

here you are i get the error from this bit self.screenWidth = App.context:GetWidth()

Script.itemSlots = 4 --int "Item slots"
Script.itemSize = Vec2(64,64) --Vec2 "Item size"
Script.offset = 8.0 --float "Offset"
Script.items = {}
Script.screenWidth = 0
function Script:Start()
self.screenWidth = App.context:GetWidth()
item1 = InventoryItem:Create()
item1.name = "Item B"
System:Print(item1:GetItemInfo())
end
function Script:PostRender(context)
for i = 1, self.itemSlots, 1 do
 context:SetColor(1,1,1)
 local x = self.screenWidth - self.itemSize.x
 local y = (i * self.itemSize.y) + (i * self.offset)
 context:DrawRect(x,y, self.itemSize.x, self.itemSize.y)
end
end

[macklebee]

The earlier versions of LE3 used App.lua which included the App class with the App:Start() and App:Loop(). That was later removed as a requirement and now the main lua script is just Main.lua without the App class. My guess is that you are using the Main.lua script as your main script, so that means the App.context does not exist.

 

I would change this line:

 self.screenWidth = App.context:GetWidth()

to these two lines:

local context = Context:GetCurrent()

self.screenWidth = context:GetWidth()

or to this combined one-liner:

self.screenWidth = Context:GetCurrent():GetWidth()

[tripper1977]

yes this one works perfect thank you for your help

self.screenWidth = Context:GetCurrent():GetWidth()