QFileSystemWatcher not working with /etc/mtab
-
wrote on 13 Aug 2011, 11:51 last edited by
Judging from "this":http://qt.gitorious.org/qt-mobility/contacts/commit/e83fbfd/diffs patch applied to Qt Mobility, there is a bug in QFileSystemWatcher, preventing it from being used in /etc/mtab. Maybe the patch I liked to can help you, too.
-
wrote on 13 Aug 2011, 11:57 last edited by
Works for me -- are you returning to the event loop?
-
wrote on 14 Aug 2011, 07:28 last edited by
loladiro: I read that page before, but I didn't quite understood what was going on...
peppe: I don't know what would be to return to the event loop, but my guess is that my code is correct, otherwise it wouldn't work with files inside /home directory right?
@watcher = new QFileSystemWatcher(QStringList() << "/etc/mtab",this);
connect(watcher, SIGNAL(fileChanged(const QString &)), this, SLOT(getPathFromFile(const QString &)));@If I change "/etc/mtab" to say a file in my home folder, the fileChanged signal is emitted, but not for "etc/mtab" file :(
-
wrote on 14 Aug 2011, 10:55 last edited by
The patch to Qt Mobility I linked basically changes the QFilesSystemWatcher and uses its inotify backend for linux. I think it is pretty straight forward what is going on, and since it does exactly what you want (listening for new devices), it might be worth it for you to see what's going on and how they replaced the old QFileSystemWatcher syntax (in red) with inotify (in green).
-
wrote on 14 Aug 2011, 11:04 last edited by
Can you paste a small, correct, compilable example that shows your problem? I know QFSW is bugged, but it appears to be working fine for me (inotify backend, Linux 3.0).
-
wrote on 12 Sept 2014, 09:51 last edited by
Sorry to dig this thread up and hijack it.
How do you get an event when an USB device is plugged (ie. Memory stick as dev/sda1)? -
wrote on 12 Sept 2014, 09:59 last edited by
Hi TheQtGuy
i don't have any efficient solution but offer some idea:-
Run Qt Creator as root :)
@sudo -b qtcreator@ -
your real-time access problem is with Dir o File? check it !
say more about ur prob. and share ur experience dear ;)
-
-
wrote on 12 Sept 2014, 11:05 last edited by
@ a.jafarabadi: ???
-
wrote on 12 Sept 2014, 11:38 last edited by
excuse me friend because of my low english writing ability
i think that you want check your USB devices, and for doing it, you watch a file usign filewatcher that OS change it when a new usb connect or disconnect, but your watch doesn't work and does not determine any change in file.
now you want understand why this problem occured? YES? -
wrote on 12 Sept 2014, 11:43 last edited by
Not exactly.
If I attach a UBS memorystick it does not get mounted automatically so I can not monitor /etc/mtab.
I need to somehow catch the USB plug event and get the device path (i.e. /dev/sda1) and then handle the mount from my Qt code. -
wrote on 12 Sept 2014, 11:59 last edited by
.. or could QFileSystemWatcher used to monitor the /dev ?
This way I t could generate an event when an sd?? is added. -
wrote on 23 Sept 2014, 15:59 last edited by
Just like to add that this works as proposed using QFileSystemWatcher used to monitor the /dev. On the event I do some filtering using QDir ... that's it.