Qt-interest Archive, April 2007
monitoring directory changes
Message 1 in thread
Hello list,
Is there any way I can be notified when the files in a directory change,
short of creating a QSocketnotifier object for each file? (I have a lot
of files). Can you somehow attach a notifier to a directory?
I'm guessing I'm out of luck here - but I thought I'd ask nonetheless.
Thanks,
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Message 2 in thread
On 16.04.07 17:00:51, Thomas Richards wrote:
> Hello list,
>
>
> Is there any way I can be notified when the files in a directory change,
> short of creating a QSocketnotifier object for each file? (I have a lot
> of files). Can you somehow attach a notifier to a directory?
>
>
> I'm guessing I'm out of luck here - but I thought I'd ask nonetheless.
Check QFileSystemWatcher if you're using Qt4.
Andreas
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Message 3 in thread
>
> Check QFileSystemWatcher if you're using Qt4.
>
Brilliant!
Thanks!
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Message 4 in thread
> >
> > Check QFileSystemWatcher if you're using Qt4.
> >
>
> Brilliant!
>
Hmm, upon closer inspection, it seems to be "almost brilliant".
QFileSystemWatcher will detect changes to file just fine, but I can't
get it to detect additions to a directory.
I guess the directoryChanged() signal isn't emitted when a file is added
to the directory?
Is there any way to detect (short of continuous polling) when a file is
added to a directory?
BEGIN:VCARD
BEGIN:VCARD
VERSION:2.1
N:Richards;Thomas
FN:Thomas Richards
EMAIL;PREF;INTERNET:thomas.richards@xxxxxxxxx
REV:20070226T164514Z
END:VCARD
Message 5 in thread
Thomas Richards schrieb:
>>> Check QFileSystemWatcher if you're using Qt4.
>>>
>> Brilliant!
>>
>
> Hmm, upon closer inspection, it seems to be "almost brilliant".
> QFileSystemWatcher will detect changes to file just fine, but I can't
> get it to detect additions to a directory.
>
> I guess the directoryChanged() signal isn't emitted when a file is added
> to the directory?
That's the idea of this signal! I can confirm that it *is* sent when you
add files to a directory (Qt 4.2.2) being watched.
For debugging try QFileSystemWatcher::directories () and see if your
directory is indeed being watched.
Cheers, Oliver
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Message 6 in thread
Thomas Richards schrieb:
>
>> That's the idea of this signal! I can confirm that it *is* sent when
> you
>> add files to a directory (Qt 4.2.2) being watched.
>
> I thought so, then I thought maybe the signal was only emitted when some
> meta data about the directory changed (permissions, ownership etc). Out
> of interest, is the signal emitted when you change meta data on a
> watched directory?
I have never tried it, but from what I understand from the Qt docs I
would assume so. But for sure it is emitted when you add files (removing
files should also cause the signal to be emitted, but have not verified
that).
Cheers, Oliver
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