Re: Creating a table through the API

[Rici Lake <lua@...>]

On 28-Jan-07, at 11:57 AM, Darius Blaszijk wrote:

> I'm trying to create a table equivalent to t = {1,2,3,4,5}
>
> Sofar what I've come up with is:
>
>  lua_newtable(L);
>  lua_pushstring(L, PChar('1'));
>  lua_pushnumber(L, 2);
>  lua_settable(L, -3);
>  lua_setglobal(L, PChar('t'));
>
> It should create a table t = {2} but when I print the table contents 
> it appears to be empty. Can anyone point me where I'm going wrong 
> here?

You're confusing numbers with strings. That will create the table:
 t = {["1"] = 2}

What you want is something like this:

/*
   Given a vector of doubles, v, of length n, create a Lua
   array of numbers, leaving it on the top of the stack
 */
void table_from_array(lua_State *L, const double *v, int n) {
  int i;
  lua_newtable(L);
  for (i = 1; i <= n; i++) {
    lua_pushnumber(L, v[i-1]);
    lua_rawseti(L, -2, i);
  }
}

/* Test */
static const double sample[] = {
  1, 2, 3, 4, 5, 6, 7, 8, 9, 10
};

table_from_array(L, sample, sizeof(sample)/sizeof(*sample));
lua_setglobal(L, "t");