how do I use astyle within emacs?

I am using windows emacs with specifications below.

GNU Emacs 23.0.91.1 (i386-mingw-nt5.1.2600) of 2009-02-26

I want to be able to run astyle so it can reformat the code by using a key command or menu. What is some other equivalent in emacs?

From stackoverflow

• Something like this might do:

  (defun astyle-this-buffer (pmin pmax)
    (interactive "r")
    (shell-command-on-region pmin pmax
                             "astyle" ;; add options here...
                             (current-buffer) t 
                             (get-buffer-create "*Astyle Errors*") t))
  

  This will run the "astyle" command on the selected region.

  Or, you could simply use emacs' built-in code formatting by typing something like

   C-x h C-M-\
  

  (I.e. select the whole buffer and run indent-region)