[Kst] kst 2.0 : No auto update?

[Peter Kümmel]

Opened a bug:
http://bugs.kde.org/show_bug.cgi?id=248104

and also found a qt-interest thread:
http://lists.trolltech.com/qt-interest/2008-02/thread00553-0.html

On Linux FAM could be a solution, 'FindFirstChangeNotification()' and
'ReadDirectoryChangesW()' on Windows. 
At least we know Qt's code isn't complete here.

Peter




Am Montag, den 16.08.2010, 17:50 -0400 schrieb Barth Netterfield:
> Whoops!
> 
> This actually sounds like a pretty general bug! (It effect linux/nfs
> as well it sounds like).
> 
> If you have a chance, can you submit it as a bug, including the link
> to the qt article.
> 
> thanks!
> cbn
> 
> On Mon, Aug 16, 2010 at 10:17 AM, Peter Milne <Peter.Milne at d-tacq.com> wrote:
> > Hi Barth, Peter
> >
> > Thanks a lot for your answers.
> >
> > summary:
> > Peter K. said that: kst 2.0 uses QFileSystemWatcher
> > Barth said that: update works on their system.
> >
> > QFileSystemWatcher should be a nice OS independent solution, better than
> > a custom timer polling hack.
> >
> > However, looks like I didn't give enough information.
> >
> > My data source is an intelligent digitizer featuring an embedded Linux
> > system. To export data to MS-Win users we can drop a subset of the
> > captured data onto a SAMBA export. The data is in DirFile format, any
> > host system  the directory mounted can plot it directly using Kst.
> >
> > It works well, other than in Kst2.0, it doesn't update dynamically, and
> > that's probably due to Qt:
> >
> > http://www.qtforum.org/article/33353/qfilesystemmodel-update-problem-for-shared-network-samba-location.html
> >
> > summary:
> >> QFileSystemModel along with QFileSystemWatcher are only for local
> >> host usage. Mounts and remote access will probably need to be handled
> >> differently through something like a threaded timer that might check
> >> the cksum of a mounted directory
> >
> > It's a shame, because Kst 1.8, on a Linux SAMBA mount does update
> > correctly. I guess it's the price of portability.
> >
> > We'll get by with pressing the "Reload" button so long, I'll try the
> > threaded timer hack some time.
> >
> > Thanks again for your excellent support.
> >
> > Best regards
> >
> >
> > Peter
> >
> >
> >
> >
> > On 08/15/2010 11:15 PM, Barth Netterfield wrote:
> >> This is strange.  We've been doing real time dirfiles all summer
> >> under Linux with no troubles.
> >>
> >> Do you have the vectors in 'count from end'?
> >
> >
> >>
> >> C. Barth Netterfield University of Toronto 416-845-0946
> >>
> >> On Aug 15, 2010 4:56 PM, "Peter Kümmel" <syntheticpp at gmx.net
> >> <mailto:syntheticpp at gmx.net>> wrote:
> >>> Am Sonntag, den 15.08.2010, 15:44 +0100 schrieb Peter Milne:
> >>>> Data source is a DirFile that gradually grows in time.
> >>>>
> >>>>
> >>>> Plotting this with kst 1.8 (FC), the plot updates at a
> >>>> respectable rate.
> >>>>
> >>>> Plotting with kst 2.0 results in a static plot, FC or MS-Win,
> >>>> it's necessary to press the RELOAD button to get a new update.
> >>>>
> >>>> Is this a feature that hasn't been activated yet in kst 2.0?.
> >>>>
> >>>> The parameter Settings|General|Update-ms looks promising, but
> >>>> doesn't seem to have an effect.
> >>>>
> >>>> What should drive this update - is it a timer in KST or perhaps a
> >>>> event (like inotify) from the OS?.
> >>>>
> >>>
> >>> Looks like a bug.
> >>>
> >>> There is a QFileSystemWatcher which should trigger an update,
> >>> DirFileSource::init() in dirfilesource.cpp:
> >>>
> >>> _watcher = new QFileSystemWatcher(); if (_fieldList.count() > 1) {
> >>> QString filePath = _dirfile->ReferenceFilename();
> >>> _watcher->addPath(filePath); } connect(_watcher, SIGNAL(fileChanged
> >>> ( const QString & )), this,
> >> SLOT(checkUpdate()));
> >>> connect(_watcher, SIGNAL(directoryChanged ( const QString & )),
> >>> this,
> >> SLOT(checkUpdate()));
> >>>
> >>> Maybe Barth knows immediately what's going wrong.
> >>>
> >>> Peter
> >>>
> >>> _______________________________________________ Kst mailing list
> >>> Kst at kde.org <mailto:Kst at kde.org>
> >>> https://mail.kde.org/mailman/listinfo/kst
> >>
> >>
> >>
> >> _______________________________________________ Kst mailing list
> >> Kst at kde.org https://mail.kde.org/mailman/listinfo/kst
> >
> >
> > --
> > Peter Milne                     Peter.Milne at d-tacq.com
> > D-TACQ Solutions Ltd            www.d-tacq.com
> > _______________________________________________
> > Kst mailing list
> > Kst at kde.org
> > https://mail.kde.org/mailman/listinfo/kst
> >
> 
> 
>