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On Fri, Aug 12, 2011 at 04:57:08AM -0700, Jose Marin wrote:

> I wouldn´t like to store the string "OnPlay", and make a search on the register for the function, would like to store the reference to the fucntion itself, to be directly called when the button is pressed.
> Any suggestions?

You can't take the actual reference to the function, as this would
defeat the garbage collector, as Lua won't know when your C code is done
with it.

Look at luaL_ref and _unref.  These will give you an integer "handle" to
a Lua value that you can then store and easily lookup when you need to.