[LUA][Error] Attempt to index ? (a nil value) in Lanes

Hello

I am currently trying to make a system that toggles my lights. It has 3 settings, off, on and time-based. To do this, I use this setup:

function update()
pullevent and so...
update()
end
function step()
some other things
end
lanes.gen(update()) <--- error
while true do
step()
end

This gives me attempt to index ? ( a nil value)
why?

dvdbrander, on 14 April 2012 - 09:34 AM said:

Hello

I am currently trying to make a system that toggles my lights. It has 3 settings, off, on and time-based. To do this, I use this setup:

function update()
os.pullevent
update()
end
function step()
end
lanes.gen(update()) <--- error
while true do
step()
end

This gives me attempt to index ? ( a nil value)
why?

u have to call os.pullEvent()
and declare it like this

arg, q1, q2, q3, q4, q5 = os.pullEvent()

and dunno waht lanes.gen is

That os.pullEvent works, just to indicate it's there. It's a shame you can't copy your code form pc's ingame…

What are you trying to do with the statement "lanes.gen(update())"

And the os.pullEvent should have ()'s at the end.

That lanes.gen(update()) should create a thread that runs seperate from the while loop. That pullevent is just to indicate there is an os.pullEvent() with all coding around it in there that pauses the function update.

ya in lua you will need the ()'s for it to work properly

There in no multi-threading in CC/Lua. You can try to run coroutines or use the parallel api to make the illusion of the system multitasking.

Coroutine help is here

There is more help further down the page.

And as for parallel, type help parallel from the terminal

Okay, then I'll try to solve this with 2 computers.

That isn't necessary - the parallel API can help you there. While Lua doesn't have "true" multithreading, it does have a form of it. Dan has helpfully made this easier for most users, so just type "help parallel" to find out more information.

To help you out so you can paste it all, you can get your code from the computer easily. Go to "%appdata%.minecraftsavessavenamecomputercomputerid" and you will find all your files in there to be edited by notepad, or another text editor of your choice.