Error in Lua code

[Monika_Miyazaki]

Error attempt to index field 'player' (a nil value) in mod for CSM.

The error occurs because the code cannot initialize the player.

Code: Select all

local player = minetest.localplayer

How do I initialize a player without making error?
Reception: We need it to work for CSM Mod.

[zing269]

CSMs load before the player exists in the world so you will need to make sure that you have a reference to the player before you try to use it.

This code will NOT work

Code: Select all

local player = minetest.localplayer

local function dostuff ( something )
  ...
  local pos = player:get_pos()
  --error occurs player not defined 

This code will work

Code: Select all

local player = minetest.localplayer

local function dostuff ( something )
  ...
  -- make sure we have a reference to player
   if not player and not minetest.localplayer then
      return
   elseif not player then
      player = minetest.localplayer
   end

  local pos = player:get_pos()

[Monika_Miyazaki]

CSMs load before the player exists in the world so you will need to make sure that you have a reference to the player before you try to use it.

Thank you for the explanation. This information should help get rid of the current problem.
And thank you for setting a good example.

[Monika_Miyazaki]

This code will work

Code: Select all

local player = minetest.localplayer

local function dostuff ( something )
  ...
  -- make sure we have a reference to player
   if not player and not minetest.localplayer then
      return
   elseif not player then
      player = minetest.localplayer
   end

  local pos = player:get_pos()

Yes. This code helped to solve the problem with initialization of the player.

[zing269]

Glad to be of help.

There are other issues with CSM, not too surprising given it's stage of development. I've also run into problems with storage, perhaps it was a similar issue of timing, or perhaps the engine is looking in /mods instead of /clientmods, I was only playing around with CSM and decided to wait for it to mature some rather than trying to find the real problem.