Re: set-marker and make-marker, Wrong type argument: integer-or-marker-p, nil

[Andreas Röhler]

Am 29.07.2012 03:38, schrieb ishi soichi:
> Emacs23
>
>   This should be simple for many of you.
> I am trying to develop a function that searches a word definition stored in
> a dict file.
>
> As you can see, when reading a text, you might need to look for additional
> information about the encountered word.
> The following function searches the information for the word in the region.
>
>
> (defvar sfl-dictionary-directory "~/Dropbox/ElmLab/dict")
> (defvar sfl-base-dict-file "test5.txt")
>
> (defun sfl-search-word-meaning ()
>    (interactive)
>    (let ((word
>   (buffer-substring (region-beginning) (region-end)))
> (result))
>      (with-current-buffer
>       (find-file (concat sfl-dictionary-directory "/" sfl-base-dict-file))
>       (goto-char (point-min))
>       (search-forward word)
>       (set-marker (make-marker) (beginning-of-line))
>       (goto-char (end-of-line))
>       (setq result (buffer-substring (region-beginning) (region-end)))
>       (message result))))
>
>
> But this gives an error
>
> save-current-buffer: Wrong type argument: integer-or-marker-p, nil

IMO this error is raised from inside `with-current-buffer'.

Seems it doesn't get the return value it expects, which looks like a bug for me,
as docstring doesn't mention a required return value, .

The result of last form "message" will be a string, which seems not being 
accepted.

Andreas




> It looks like (set-marker ... part is doing something wrong.
>
> Could anyone point out the mistake I am making?
>
> soichi