SetSignLines does not work

[nixi]

Hi,
I have started using lua yesterday and I just can not get past this problem. I need to update all lines of a specific sign. "World:SetSignLines()" Either does nothing (if called in a function started by a hook) or it throws out an error (if started in an independent function). How can I use this properly?

function poiMain(Split, Player)
  World:SetSignLines(58, 64, 42, "test", "test", "test", "test")
  return true
end

Code:

[15:34:37] LUA: Plugins/PointsOfInterest/functions.lua:52: attempt to index global 'World' (a nil value)
[15:34:37] Stack trace:
[15:34:37]   Plugins/PointsOfInterest/functions.lua(52): (no name)
[15:34:37] Stack trace end
[15:34:37] Error in plugin PointsOfInterest calling function <callback>()

[NiLSPACE]

Hello and welcome to the forum.

Your World variable is empty, but you can get it from the player:

function poiMain(Split, Player)
  Player:GetWorld():SetSignLines(58, 64, 42, "test", "test", "test", "test")
  return true
end

[nixi]

Yes, that works. Thank You.
What if I wanted to GetSignLines and assign Line4 into a variable?
I tried this:

lines = Player:GetWorld():GetSignLines(BlockX, BlockY, BlockZ)
Player:SendMessage(lines[4])

That, of course, did not work.

[ThuGie]

Is it not 0-3 ? instead 1-4 ?

[NiLSPACE]

Try this:

local IsValid, Line1, Line2, Line3, Line4 = World:GetSignLines(PosX, PosY, PosZ)

[nixi]

Is it not 0-3 ? instead 1-4 ?

As far as I know, lua starts counting from 1. It does not work even when I change it to 3.

---

Try this:

local IsValid, Line1, Line2, Line3, Line4 = World:GetSignLines(PosX, PosY, PosZ)

This works! Tahnk you very much.

My code:

local IsValid, Line1, Line2, Line3, Line4 = Player:GetWorld():GetSignLines(BlockX, BlockY, BlockZ)

[xoft]

You'd need to make an array out of the "lines" variable. Lua has bit different syntax rules:

local a, b, c = 1, 2, 3, 4
--> a == 1; b == 2; c == 3; 4 gets forgotten

-- In this same fashion:
local lines = "line1", "line2", "line3", "line4"
--> lines = "line1"; Lua discards "line2" - "line4"

-- You probably want this:
local lines = { World:GetSignLines(PosX, PosY, PosZ) }
--> lines[1] == "line1"; lines[2] == "line2" etc.

[xoft]

Ahele, se stim smiř?

[Seadragon91]

@xoft The function also returns at first position a IsValid variable. The lines would then start at index 2.

[xoft]

Yea, that's right.