WinApi Dll Hooks how to create global variable available in hook function?

Question

C++ / C#

There is a program (main.c) and a dll (dllmain.c)
in the program, I call a function from a dll that sets a hook (for example, to move a window). I pass some parameter to this function (for example, int)
how to make this parameter available in the hook function?
ps
in short, what i'm doing is i need to filter the windows on which the hook is installed (log only certain windows)

Answer 1

This is done using a memory mapped file. How to do this is described in the article .