How to get the Window Class Name and Id from HWND?

Question

How to get the Window Class Name and Id from HWND?

I searched but found the opposite is more popular.

Any thoughts?!?!?

Answer 1

Answers by Andreas and Arthur show how to get the class name. With 'Id' perhaps you mean the window identifier for child windows;

GetWindowLong(HWnd, GWL_ID)