Re: IUP - Obtaining the Ihandle in C from Lua

[Antonio Scuri <scuri@...>]

At 13:18 22/12/2005, Mark Meijer wrote:
> Hi, I'm not sure if this is the right place for this question. If 
> not, then I appologize. I was wondering how to hand my C code the 
> Ihandle of an IUP element (in my case a regular dialog) that was 
> created from within a lua script. I found the page in the manual 
> (also in the new version, where it is found under System -> Guide > 
> Other -> IupLua Advanced) mentioning
> lua_unboxpointer in (Lua 5), but I have no idea what is meant by 
> this and there is no further explanation. I did a full text search 
> for "lua_unboxpointer" in the lua sources as well as the IUP sources 
> and got no hits, same when searching for just "unbox".
> Does anyone know what I need? It also mentions lua_touserdata for 
> lua 4, is this what I need for lua 5 then as well? If so, what 
> exactly would I pass to the c function as argument, from the lua 
> script, the dialog object itself?

  That paragraph is outdated. I removed refereces to lua_*boxpointer 
because the code now works also in Lua 5.1.

  You can use:

      Ihandle* h = *(Ihandle**)lua_touserdata(L, idx);

Best,
scuri