Re: Question about pointer......

[Eero Pajarre <epajarre@...>]

Ben Sunshine-Hill wrote:
> > I would like to ask a question.... for a MMO RPG wrote by C++ and
> > using LUA as a script tools..... when a player access the script like
> >
> > the following..
> >
> > if (gold >= 5000)
> >   Dec(gold, 5000)
> >
> > How do the server know which player will be decreased $5000 since
> > in LUA doesn't know the player UIN......
>
>
> Lua will know the player UIN if you tell it the player UIN. But I think your 
> code would probably look more like the following:
>
> if(myPlayer.gold >= 5000) then
>     myPlayer.gold -= 5000
> end

In this situation you might need to protect players from each other.
So maybe the setup is like this:

/* in C++ or C code */

setup_lua_environment_for_user(UIN);

/* now lua references to gold mean UIN.gold */
call_lua_script(SCRIPT);

setup_lua_environment_for_user(OTHER_UIN);

/* now lua references to gold mean OTHER_UIN.gold */
call_lua_script(SCRIPT);


	Eero