Sounds like you're looking for the post-command-hook.

- Magnar


On Wed, Jun 5, 2013 at 7:26 AM, Ivanov Dmitry <usr345@gmail.com> wrote:

> Suppose, I have the code:
>
> (defun dummy ()
>       (interactive)
>       (message "aaa"))
>
> (local-set-key (kbd "<left>") 'dummy)
>
> When you click <left> key in the current buffer, it will print "aaa".
>
> Is it possible to attach this action to any key pressed?
>
> I looked into "Format of Keymaps" and "Searching Keymaps" in Emacs info
> pages, but found no code examples.
>