Keyboard issues

_Mark_

Hi,
I've already read that document but still I cannot get it works.

I export QT_QPA_EVDEV_KEYBOARD_PARAMETERS='grab=1', then I create my CoreApp class upon QCoreApplication. Here I reimplement the virtual bool event(QEvent *e).

But no events are generated while pressing keys on the keyboard.

Surely I'm missing something!

SGaist

Did you specify the exact device to use as a keyboard ?

_Mark_

I think is not necessary because there is only one input device: the keyboard itself.

Anyway I tried to set that env var to '/dev/input/input0;grab=1' with no chance.

SGaist

Did you check whether you have the rights to access that device ?

_Mark_

Yes I did. Currently, I'm running the application as root to avoid any problem related to the rights.

SGaist

Then call your application with QT_DEBUG_PLUGINS=1 set, you'll see if there's something happening with the plugins.

_Mark_

Setting QT_DEBUG_PLUGINS=1 leads to no warnings nor messages. The pressed keys are still sent to the console.

SGaist

Can you show your configuration and the command used to launch your application ?

_Mark_

It's a Raspberry Pi Model B+ running a linux buildroot o.s.:

@

uname -a

Linux rpi 3.12.26 #1 PREEMPT Thu Oct 2 20:45:27 CEST 2014 armv6l GNU/Linux
@

Here the command I use to launch my application:

@
./myapp
@

I also tried:

@
./myapp < /dev/tty1
@

Even with the QT_QPA_EVDEV_KEYBOARD_PARAMETERS variable set, when I hit any key on the keyboard it will show the char on the console, instead of being grabbed by the application. I.e. no QCoreApplication::event() is emitted.

SGaist

What parameters did you set on QT_QPA_EVDEV_KEYBOARD_PARAMETERS ?

_Mark_

As I said in a previous post I tried the following:

@
export QT_QPA_EVDEV_KEYBOARD_PARAMETERS=‘grab=1’
export QT_QPA_EVDEV_KEYBOARD_PARAMETERS=‘/dev/input/input0;grab=1’
@

Anyway the keyboard is the only input device available and also the only USB device connected.

SGaist

Are you running your application through ssh ?

_Mark_

The behavior is the same if either I launch the application through ssh or locally.

Halo_Hao

run：cat /proc/bus/input/devices