Problem using with-temp-file

Problem using with-temp-file

[rgb]

When I use with-temp-file I end up with an empty file although the
trace doesn't show me any good reason for the file being empty.

Does anyone see why I get an empty file?
I inserted the call to debug and looked at the temp buffer to be sure
the correct data really was in the buffer.  The arguments to write-
region seem to confirm that it's working against the correct
buffer....

Thanks

Debugger entered--entering a function:
* write-region(1 2943 "~/Data-2007-02-07-07:17.txt" nil 0)
* (save-current-buffer (set-buffer temp-buffer) (widen) (write-region
(point-min) (point-max) temp-file nil 0))
* (with-current-buffer temp-buffer (widen) (write-region (point-min)
(point-max) temp-file nil 0))
  (prog1 (with-current-buffer temp-buffer (insert ...) (debug)) (with-
current-buffer temp-buffer (widen) (write-region ... ... temp-file nil
0)))
  (unwind-protect (prog1 (with-current-buffer temp-buffer ... ...)
(with-current-buffer temp-buffer ... ...)) (and (buffer-name temp-
buffer) (kill-buffer temp-buffer)))
  (let ((temp-file my-data-file) (temp-buffer ...)) (unwind-protect
(prog1 ... ...) (and ... ...)))
  (with-temp-file my-data-file (insert (get-my-data)) (debug))
  eval((with-temp-file my-data-file (insert (get-my-data)) (debug)))
  eval-expression((with-temp-file my-data-file (insert (get-my-data))
(debug)) nil)
  call-interactively(eval-expression)

Re: Problem using with-temp-file

[Robert Thorpe]

On Feb 7, 3:52 pm, "rgb" <rbiel...@i1.net> wrote:
> When I use with-temp-file I end up with an empty file although the
> trace doesn't show me any good reason for the file being empty.
>
> Does anyone see why I get an empty file?
> I inserted the call to debug and looked at the temp buffer to be sure
> the correct data really was in the buffer.  The arguments to write-
> region seem to confirm that it's working against the correct
> buffer....

Could you post your code too?  It would help.

Re: Problem using with-temp-file

[rgb]

On Feb 7, 10:52 am, "Robert Thorpe" <rtho...@realworldtech.com> wrote:
> On Feb 7, 3:52 pm, "rgb" <rbiel...@i1.net> wrote:
>
> > When I use with-temp-file I end up with an empty file although the
> > trace doesn't show me any good reason for the file being empty.
>
> > Does anyone see why I get an empty file?
> > I inserted the call to debug and looked at the temp buffer to be sure
> > the correct data really was in the buffer.  The arguments to write-
> > region seem to confirm that it's working against the correct
> > buffer....
>
> Could you post your code too?  It would help.

By "your code" you must mean the contents of get-my-data?
It's big and messy but I tried to whittle it down.
At that point I found that when I brought it all the way down to
(defun get-my-data () "hello")
I still ended up with an empty file.
At which point I tried this with the same results
(with-temp-file my-data-file (insert "This really sucks"))

Re: Problem using with-temp-file

[rgb]

On Feb 7, 12:05 pm, "rgb" <rbiel...@i1.net> wrote:
> On Feb 7, 10:52 am, "Robert Thorpe" <rtho...@realworldtech.com> wrote:
>
> > On Feb 7, 3:52 pm, "rgb" <rbiel...@i1.net> wrote:
>
> > > When I use with-temp-file I end up with an empty file although the
> > > trace doesn't show me any good reason for the file being empty.
>
> > > Does anyone see why I get an empty file?
> > > I inserted the call to debug and looked at the temp buffer to be sure
> > > the correct data really was in the buffer.  The arguments to write-
> > > region seem to confirm that it's working against the correct
> > > buffer....
>
> > Could you post your code too?  It would help.
>
> By "your code" you must mean the contents of get-my-data?
> It's big and messy but I tried to whittle it down.
> At that point I found that when I brought it all the way down to
> (defun get-my-data () "hello")
> I still ended up with an empty file.
> At which point I tried this with the same results
> (with-temp-file my-data-file (insert "This really sucks"))

After noticing that this
(with-temp-file "Test.txt" (insert "More testing"))
worked fine.
I realized wherein the problem lies

Debugger entered--entering a function:
* write-region(1 2943 "~/Data-2007-02-07-07:17.txt" nil 0)

The empty file's name is "Data-2007-02-07-07" not
"Data-2007-02-07-07:17.txt"
write-region must be mishandling an error of some kind.

Re: Problem using with-temp-file

[Robert Thorpe]

On Feb 7, 6:29 pm, "rgb" <rbiel...@i1.net> wrote:
> On Feb 7, 12:05 pm, "rgb" <rbiel...@i1.net> wrote:
>
>
>
> > On Feb 7, 10:52 am, "Robert Thorpe" <rtho...@realworldtech.com> wrote:
>
> > > On Feb 7, 3:52 pm, "rgb" <rbiel...@i1.net> wrote:
>
> > > > When I use with-temp-file I end up with an empty file although the
> > > > trace doesn't show me any good reason for the file being empty.
>
> > > > Does anyone see why I get an empty file?
> > > > I inserted the call to debug and looked at the temp buffer to be sure
> > > > the correct data really was in the buffer.  The arguments to write-
> > > > region seem to confirm that it's working against the correct
> > > > buffer....
>
> > > Could you post your code too?  It would help.
>
> > By "your code" you must mean the contents of get-my-data?
> > It's big and messy but I tried to whittle it down.
> > At that point I found that when I brought it all the way down to
> > (defun get-my-data () "hello")
> > I still ended up with an empty file.
> > At which point I tried this with the same results
> > (with-temp-file my-data-file (insert "This really sucks"))
>
> After noticing that this
> (with-temp-file "Test.txt" (insert "More testing"))
> worked fine.
> I realized wherein the problem lies
>
> Debugger entered--entering a function:
> * write-region(1 2943 "~/Data-2007-02-07-07:17.txt" nil 0)
>
> The empty file's name is "Data-2007-02-07-07" not
> "Data-2007-02-07-07:17.txt"
> write-region must be mishandling an error of some kind.

Looks like your Emacs is mistaking the ":" in the filename for the end
of the filename.
On MS Windows with GNU Emacs 21.3 this doesn't happen to me, the above
works fine.

This could be a bug in filename handling in Emacs, or in the C library
of the platform it is using.

Re: Problem using with-temp-file

[rgb]

> > After noticing that this
> > (with-temp-file "Test.txt" (insert "More testing"))
> > worked fine.
> > I realized wherein the problem lies
>
> > Debugger entered--entering a function:
> > * write-region(1 2943 "~/Data-2007-02-07-07:17.txt" nil 0)
>
> > The empty file's name is "Data-2007-02-07-07" not
> > "Data-2007-02-07-07:17.txt"
> > write-region must be mishandling an error of some kind.
>
> Looks like your Emacs is mistaking the ":" in the filename for the end
> of the filename.
> On MS Windows with GNU Emacs 21.3 this doesn't happen to me, the above
> works fine.

I've been using 22.0.x for years and really don't know what I'd do
without it.  So many things I take for granted wern't available in
21.3
>
> This could be a bug in filename handling in Emacs, or in the C library
> of the platform it is using.- Hide quoted text -
>
> - Show quoted text -

It's beyond me to tell if the name should have been checked by lisp
code (it wasn't) or the problem is within the C code of write-region
so a general bug report was made.

I can't help but be curious what 'works fine' means since : is
supposedly
illegal in MS filenames.  Do you get a file with : in the name à
la .emacs
or is the : missing but the contents still good or do you get an
error...

Re: Problem using with-temp-file

[Robert Thorpe]

On Feb 8, 2:09 pm, "rgb" <rbiel...@i1.net> wrote:
> > Looks like your Emacs is mistaking the ":" in the filename for the end
> > of the filename.
> > On MS Windows with GNU Emacs 21.3 this doesn't happen to me, the above
> > works fine.
>
> I've been using 22.0.x for years and really don't know what I'd do
> without it.  So many things I take for granted wern't available in
> 21.3

I made a policy long ago of never using CVS software that wasn't
released.  I'm considering making an exception for Emacs.

> illegal in MS filenames.  Do you get a file with : in the name à
> la .emacs
> or is the : missing but the contents still good or do you get an
> error...

Checking again I see that it doesn't work, it's just that Emacs 21
does not raise an exception to report the error!

Re: Problem using with-temp-file

[Stefan Monnier]

> Looks like your Emacs is mistaking the ":" in the filename for the end of
> the filename.  On MS Windows with GNU Emacs 21.3 this doesn't happen to
> me, the above works fine.

IIRC this is a feature of your OS where the ":" is used for some special
file-handling thingy, maybe something like forks or some such.
It may depend on the specific version of w32 you're using, and/or on the
filesystem itself.


        Stefan

Re: Problem using with-temp-file

[Juanma Barranquero]

On 2/9/07, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

> IIRC this is a feature of your OS where the ":" is used for some special
> file-handling thingy, maybe something like forks or some such.

Yes, rgb is creating a NTFS "stream". In fact, "notepad
Data-2007-02-07-07:17.txt" will allow him to edit the stream (though,
strangely enough, CMD's type won't show it, I think).

                    /L/e/k/t/u

Re: Problem using with-temp-file

[Kevin Rodgers]

Robert Thorpe wrote:
> On Feb 8, 2:09 pm, "rgb" <rbiel...@i1.net> wrote:
>> I've been using 22.0.x for years and really don't know what I'd do
>> without it.  So many things I take for granted wern't available in
>> 21.3

UTF coding systems!

> I made a policy long ago of never using CVS software that wasn't
> released.  I'm considering making an exception for Emacs.

Me, too.  You should feel pretty confident using the pretest versions
(e.g. 22.0.90 through 22.0.93) available at 
ftp://alpha.gnu.org/gnu/emacs/pretest/


-- 
Kevin Rodgers
Denver, Colorado, USA