RE: Returning data from C functions called using "loadlib".

[Ignacio Burgueño <ignacio@...>]

> -----Original Message-----
> From: lua-bounces@bazar2.conectiva.com.br 
> [mailto:lua-bounces@bazar2.conectiva.com.br] On Behalf Of Aaron Newell
> Sent: Martes, 31 de Agosto de 2004 12:30
> To: lua@bazar2.conectiva.com.br
> Subject: Re: Returning data from C functions called using "loadlib".
> 
> Thanks but that doesnt seem to work:
> 
> extract from c file:
>  static int functionFromCLibrary(lua_State* L)  {
>   int a = (int)lua_tonumber(L, -1);
>   printf("cfunction: %d\n", a);
>   a = a + 1;
>   printf("cfunction now: %d\n", a);
>   return a;
>  }
> 


I'm quite sure that C code is wrong. You need to push a onto the stack, and
then return how many results your function is returning. So the function
would be something like:

static int functionFromCLibrary(lua_State* L)  {
   int a = (int)lua_tonumber(L, -1);
   printf("cfunction: %d\n", a);
   a = a + 1;
   printf("cfunction now: %d\n", a);
   lua_settop(L, 0);
   lua_pushnumber(L, a);
   return 1;
}


Greetings,
Ignacio Burgueño