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Starting with Lua, coroutines and other stuffs (need patient people to help)

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Posted by Aiseant (33 posts) Bio

Date

Reply #15 on Thu 07 Apr 2011 08:15 AM (UTC)

Amended on Thu 07 Apr 2011 08:21 AM (UTC) by Aiseant

Message

Thanks for your help

I saw the funcion in lua_scripting, and you used it in the original startup.lua (or its equivalent to get the player's name)
If I understand well, when it says "attempt to index local room (a nil value)", this means that he doesn't know what I'm trying to call, right ? something like an undeclared function.

I just did


function mob_byte()

	local room = mud.room_info ()


...
end --function

I have this : mob_byte = require("mob_byte").mob_byte
in starup.lua

And mob_byte is called when a mob (called Byte) is created : Byte have an open_lua, then a call_lua calling mob_byte function

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Posted by Nick Gammon Australia (23,140 posts) Bio Forum Administrator

Date Reply #16 on Thu 07 Apr 2011 09:03 AM (UTC)

Message

Which line exactly is the error on? I don't see how this line is indexing anything:


	local room = mud.room_info ()

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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Posted by Aiseant (33 posts) Bio

Date

Reply #17 on Mon 11 Apr 2011 01:51 PM (UTC)

Amended on Mon 11 Apr 2011 03:14 PM (UTC) by Aiseant

Message

Nick Gammon said:

Which line exactly is the error on? I don't see how this line is indexing anything:


	local room = mud.room_info ()

Ya, this doesn't return error, but as soon I try to use the "room", nil value blabla
For instance, got this local room = mud.room_info () in the beginning and player= room.first_person; few lines after.

player= room.first_person; returns the attempt to index local "room" (nil value)

note: my modified L_room_info does define a first_person attribute to the room

edit : I will look if I cannot do what I wanted directly with L_players_in_room

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Posted by Nick Gammon Australia (23,140 posts) Bio Forum Administrator

Date Reply #18 on Mon 11 Apr 2011 11:15 PM (UTC)

Message

My code returns nil if the current character is not in a room:


static int L_room_info (lua_State *L)
{
  CHAR_DATA * ch = L_getchar (L); /* get character pointer */
  ROOM_INDEX_DATA * room = ch->in_room;  /* which room s/he is in */
  EXIT_DATA * pexit;
  
  if (lua_isnumber (L, 1))
    room = get_room_index( check_vnum (L) );
 
  if (room == NULL) 
    return 0;  /* oops - not in room or specified room does not exist */

So you need to look into whether ch->in_room is NULL or not. Maybe use gdb to get to the bottom of it?

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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