Re: CallBacks and Proto

[Rici Lake <lua@...>]

On 26-Oct-06, at 11:32 AM, jdarling@eonclash.com wrote:

> Rici, I don't quite get what you mean.  Here is what I tried and it
> didn't work (of course).  I know how to create an entry into the
> registry, but then how would I go about calling the method once I've
> stored it?

Get it back out of the registry and call it.


> A small sample would be great.
>
> :EXISTING CODE:
> var
>   pL : Plua_State;
>   callfunc : integer;
               ^^^^^^
> function lua_astarCallback(X, Y, Fx, Fy: integer): integer;
> begin
>       WriteLn('Calling cfunction: '+IntToStr(Integer(callfunc)));
>   lua_rawgeti(pL, LUA_REGISTRYINDEX);
        ^^^^^

-- CLIP --
> //      callfunc := lua_tocfunction(L, 9);
         callfunc := luaL_ref(L, LUA_REGISTRYINDEX);
 // Works because you know the stack has exactly nine things on it
 // Otherwise, I'd use:
           lua_pushvalue(L, 9);
           luaL_reg(L, LUA_REGISTRYINDEX);

See the refman or PiL for more details