Re: Create Lua Table in CPP

[Eva Schmidt <es@...>]

Hi Rodrigo,

this should work (Pseudocode):


lua_newtable (L); -- push a new table

lua_pushstring (L, "User");
lua_newtable (L);
lua_pushstring (L, "Name");
lua_pushstring (L, "Rodrigo");
lua_settable (L, -3); -- sets Name = Rodrigo into table User
		      -- and pops both the key and the value from the stack

lua_pushstring (L, "Age");
lua_pushnumber (L, "99");
lua_settable (L, -3); -- sets Age = 99 into table User
		      -- and pops both the key and the value from the stack

lua_pushstring (L, "Status");
lua_pushnumber (L, "Management");
lua_settable (L, -3);

lua_settable (L, -3); -- put table User into new table

.... do the same for table Var, Position and Bin


-- register the newtable containing the subtables to the global environment and 
-- name it "Settings"	
lua_setglobal (L, "Settings"); -

As you can see: It's always the same mechanism, so using Macros can shorten your 
Code enormously.

You can push this as your own library into lua with using luaL_register. Look 
into the Lua code to find out more ...

Regards,
Eva


Rodrigo Araújo wrote:
> Hi there,
>
> A lua user will be able to access a structure like Settings.User.Name 
> <http://Settings.User.Name> inside a Lua file at any moment.
> This said, these information are only available at C++ files, so I have 
> 2 problems:
>
> 1. I need to define in C++ a table (Settings) that has four other tables 
> inside (User, Var, Position and Bin) and these have the attributes 
> (User: name, age, status, Var: int1, int2, int3, Position: int4, int5, 
> int6, Bin: char1, char2, char3)
> 2. I need to make these tables available for Lua users at any moment of 
> the code through their names, like Settings.User.name 
> <http://Settings.User.name> or Settings.Var.int1.
>
> I know that lua_newtable(L) creates a new table on top of the stack, but 
> that doesn't make it available through her own name (like Settings), the 
> user would must have to receive this table as a return statement from 
> some kind of function... Is there anyway to do it?
>
> Thanks in advance,
> Rodrigo Araujo