[API] Calling a advanced library function

[Marc Vollmer <marc.vollmer@...>]

Hello.

I have wrote a small library "vom" for LUA. The interpreter works fine:

--begin output --
Lua 5.1.1  Copyright (C) 1994-2006 Lua.org, PUC-Rio
> require "vom"
> print(vom.getloop())
25
>
-- end output --

Now, I want to call the function "vom.getloop()" from the API, but I
don't have any results. I try this:

-- begin source --
LUASTATE init(void) {
  //lua_State *L = lua_open();
  lua_State *L = luaL_newstate();
  printf("L:%d\n",L);
  luaL_openlibs(L);
  luaL_dofile(L,"testlib.lua");
  return L;
}

double get_counter(LUASTATE L) {
  double tmp;
  lua_getglobal(L,"vom.getloop"); 
  lua_pushnil(L);
  lua_resume(L,1);
  tmp = lua_tonumber(L,-1);
  printf("Error:%s",lua_tostring(L,-2));
  return tmp;
}
-- end source--

At first I make a "init" and load the "testlib.lua", because here is the
the require "vom" integrated.

The error message is:
> Error:attempt to call a nil value

It is possible to call the function "vom.getloop()" directly from the
API, in this case from the C-Function "get_counter" ???

THX
Marc