> From: "Albert" <georgealbert@qq.com>
> Cc: "emacs-devel" <emacs-devel@gnu.org>
> Date: Mon, 13 Apr 2020 14:12:25 +0800
> 
> I try to figure out how to do this without static variables. Static variable is the simplest way to do the job
> between window thread and lisp thread right now.

I suggested to pass the information via the 2 last arguments of
PostThreadMessage.  Did you try that?

Thanks.