Re: C Function returning a table to LUA?

["Jason P" <ahq_ranger@...>]

Try something like this, given your filenames are in array MyFileNames:

lua_newtable(L);
for (int i = 0; i < NumFileNames; i++)
{
    lua_pushnumber(L,i);
    lua_pushstring(L,MyFileNames[i]);
    lua_settable(L,-3);
}
return 1;

that should make a numbered table array of strings and return it back to 
LUA. It should be simple
enough to grasp, we create a new table on top of the stack. Then push key -> 
value pairs onto the stack one at a time, which lua_settable() pops off and 
inserts into the table below the 2 keys for every iteration.

Jason

> From: "Andy Bushnell" <andy@carbongraphics.com>
> Reply-To: Lua list <lua@bazar2.conectiva.com.br>
> To: <lua@bazar2.conectiva.com.br>
> Subject: C Function returning a table to LUA?
> Date: Mon, 29 Sep 2003 01:18:13 -0600
>
> Hi,
>
> Please excuse my ignorance (i'm a Lua newbie).
>
> I have a 'C' function (getFileListing) that has been registered with Lua. 
> It
> compiles a list of files in the current working directory. Everything works
> fine until I try *returning* this info to Lua. How can I do it?
>
> My Lua script (right now) makes the call...
>
> getFileListing()
>
> Nothing happens but printf's in the getFileListing function show that its
> being called & doing the right thing. So now I have an array of strings 
> (the
> file names) in the 'C' side but I want to pass this info back to the 
> script.
> I think I need to use a "Table" to pass this info to Lua, but tables are 
> new
> to me and I cant see an example which does what I want (which, as a newbie,
> im looking for!).
>
> I'd like my script (I think) to look something like ...
>
> t = getFileListing() -- where t is the returned table
>
> -- check for table size
>
> -- iterate through table getting the file listing names
>
> (im not sure of the exact table iteration syntax - but I can work that out
> later).
>
> I hope this isnt too simple a question - but any help would greatly
> appreciated.
>
> Regards,
>
> Andy

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