Re: Passing C struct values automatically to Lua

[zweifel <zweifel@...>]

Thanks steve,

I see what you mean.. but since I just need the path, I would rather only pass the path as a parameter...

Specially because I call these functions each frame, so it needs to be optimized...

2009/11/6 steve donovan <steve.j.donovan@gmail.com>

On Fri, Nov 6, 2009 at 3:20 PM, zweifel <zweifel@gmail.com> wrote:
> hey steve, that would be a better solution, but why my print(arg) returns
> nil? Ok, maybe I have not passed any arguments, but do I have to pass args
> in order to access the arg[0]??

Because it's only set by the Lua interpreter itself.  But you can
create your own args table, make it global and access that from your
script.

E.g. in lua.c:

 int narg = getargs(L, argv, n);  /* collect arguments */
 lua_setglobal(L, "arg");

where getargs() is

static int getargs (lua_State *L, char **argv, int n) {
 int narg;
 int i;
 int argc = 0;
 while (argv[argc]) argc++;  /* count total number of arguments */
 narg = argc - (n + 1);  /* number of arguments to the script */
 luaL_checkstack(L, narg + 3, "too many arguments to script");
 for (i=n+1; i < argc; i++)
   lua_pushstring(L, argv[i]);
 lua_createtable(L, narg, n + 1);
 for (i=0; i < argc; i++) {
   lua_pushstring(L, argv[i]);
   lua_rawseti(L, -2, i - n);
 }
 return narg;
}

-- 
God$ g++ -o earth earth.cpp -O3 -lanimals -lplants -lvirus

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