Re: table to userdata

[torch blue <bluetorchgames@...>]

Thanks for the reply. I knew it probably is something like this and thanks for confirming me with that. But it seems a little bit hard, given many of this kind of tables need to be imported to C. I like tolua, which exposes C structures automaticlly to Lua. Is there a equivalent to do the reverse? Or everyone use this direct importing function?

 

Thanks

 

John

Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br> wrote:

> > What's the best way to fill a userdata with a table?
>
> You can set metamethods for this. But if you're using "config{...}" in Lua,
> then it is easier to write a C function exported as "config" that does the job.
>
> It would be something like this (untested):
>
> static CConfig myconfig;
>
> static int do_config(lua_State *L)
> {
> lua_pushliteral(L,"length"); lua_gettable(L,1);
> myconfig.level=lua_tonumber(L,-1);
> lua_pushliteral(L,"width"); lua_gettable(L,1);
> myconfig.width=lua_tonumber(L,-1);
> lua_pushliteral(L,"red"); lua_gettable(L,1);
> myconfig.red=strdup(lua_tonumber(L,-1));
> return 0;
> }
>
> I'm not sure what you need to do to copy the value of "red"; I've just used
> strdup, which I'm not sure works for C++ strings.
>
> Also, there is no error handling, but I hope you get the idea.
> --lhf

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