[Kst] kst 2.0 : No auto update?

[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
>>>
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>>
>>
>>
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>
>
> --
> Peter Milne                     Peter.Milne at d-tacq.com
> D-TACQ Solutions Ltd            www.d-tacq.com
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>



-- 
C. Barth Netterfield
University of Toronto
416-845-0946