To: Robert Roessler <robertr at rftp.com>
Cc: LablGTK List <lablgtk at math.nagoya-u.ac.jp>
Subject: Re: Pixbuf combo box
References: <lkylwlh0.fsf at mail.ru> <wti1rwc6.fsf at mail.ru>
	<43A72F18.6000309@rftp.com>
From: Dmitry Bely <dbely at mail.ru>
Date: Tue, 20 Dec 2005 13:28:08 +0300
In-Reply-To: <43A72F18.6000309 at rftp.com> (Robert Roessler's message of "Mon,
 19 Dec 2005 14:07:20 -0800")
Message-ID: <vexkf4g7.fsf at mail.ru>
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Robert Roessler <robertr at rftp.com> writes:

> Dmitry Bely wrote:
>> OK, trying to make it running myself, I've faced the following problem:
>> # let columns = new GTree.column_list;;
>> val columns : GTree.column_list = <obj>
>> # let icon_c = columns#add (Gobject.Data.gobject_by_name "GdkPixbuf");;
>> Exception: Failure "Gobject.Type.from_name: GdkPixbuf".
>
> You can not always take arbitrary expressions out of context and
> expect them to work... :)
>
> Here, it seems like you need to actually have created a GdkPixbuf
> first.  In the context of this example, try inserting the following
> before the above code:
>
> let _ = GdkPixbuf.from_file "gnome-fs-regular.png";;

It's a very strange behaviour (not to say a bug). IMHO, at least it should
be documented somethere, shouldn't it?

>> This is just taken from lablgtk-2.6.0/examples/iconview.ml, why it does not
>> work? (the example itself fails on my Win32 system with
>> Exception: Sys_error "/: Invalid argument".
>> - probably it was written with Unix in mind)
>
> As for the full example itself, yes, you need to change [at least] the
> "/" in line 123 to something Windows likes, e.g., "c:/":
>
> let data = create_store file_pb folder_pb "c:/" in

It still won't work: go to some top-level directory and then return to
c:\. You'll see

C:\Work\Ocaml\lablgtk-2.6.0\examples>lablgtk2 unix.cma iconview.ml
tree_path = 20 path = c:/atest
In callback for signal clicked, uncaught exception: Unix.Unix_error(20,
"stat", "c:atest")

OK, this does not relate to LablGtk in any way, but still its examples
should be correct :-)

BTW, I think that it is a bug then (Sys.readdir "/")  raises an
Sys_error exception under Win32. I have submitted the Ocaml bug report on
that behaviour.

> Beyond that, there are more problems at runtime - some directories get
> displayed properly, and on others, the program just stops
> responding... perhaps worse than this, the example program is *really*
> slow at scanning and displaying directory contents.
>
> Since overall, GTK on my Windows XP box does not seem terribly slow, I
> am hoping that this is just reflecting a weakness in this example.

- Dmitry Bely