Re: Writing Emacs-function: how?

[harven]

Ulrich Scholz <d7@thispla.net> writes:

> I try to write an Emacs function and bind it to a key.  My first try
> is given below.  But I get the error
> "Wrong type argument: commandp, my-replace"
>
> I tried several versions but none worked.  Could you give me a correct
> version. Thanks.
>
> BTW, the function should replace all occurences of the string "<DF>"
> by "ß" in the current buffer.
>
> (defun my-replace nil "doc-string"
>   (while (re-search-forward "<DF>" nil t)
>     (replace-match "ß" nil nil)))
>
> (global-set-key [f7] 'my-replace)

 (defun my-replace nil 
 "this command replaces all occurences of <DF> by ß"
   (interactive)
   (while (search-forward "<DF>" nil t)
     (replace-match "ß" nil nil)))

 (global-set-key [f7] 'my-replace)

Only commands can be bound to keys. A command is a function 
that can be called interactively with the M-x prefix e.g. M-x my-replace
The (interactive) line above turns the function my-replace into a command.
Finally, you don't need to use re-search-forward, which deals with 
regular expressions, but just the simpler command search-forward.

Hope this helps