Passing variable to the WindowProcedure

Without creating global variables, is there a way to pass variables to the WindowProcedure that handles the messages?

For example, if I create a variable and initialize it in WinMain, is there any way to use it in my WindowProcedure?

What I am doing is this. I have a class called Map. I also have a class called Texture and Window.

When I create Texture and Window, certain variables are created such as texWidth, texHeight, windowWidth, and WindowHeight inside of the class.

In my Window Procedure, I need to use those variables held inside of Texture and Window for some function calls.

Is there any way to do this easily? I would really like to keep it simple and try to avoid global variables if possible.

yes you can! :) Like the said to you here, you need to use the last param of CreateWindowEx.