Run GUI app from command line

Question

I would like to launch X application using buttons on 3.2 inch TFT. I the beginning I am trying to lauch app from the remote bash console.

My X are running:

root@raspberrypi:~# ps aux |grep xserver
pi        2435  0.0  0.2   3044   796 ?        S    22:34   0:00 xinit /etc/X11/xinit/xinitrc -- /etc/X11/xinit/xserverrc :0 -auth /tmp/serverauth.UVIbNw3DC8

then I was trying following:

root@raspberrypi:~# export DISPLAY=:0
root@raspberrypi:~# matchbox-keyboard
No protocol specified
Cannot open display

What I am doing wrong?

Answer 1

I think you just hit an authentication problem with X. You need to authorize your cookie.

First off, get your cookie by running xauth list $DISPLAY

Sample output:

pi@server0 ~ $ xauth list $DISPLAY
raspberrypi/unix:0  MIT-MAGIC-COOKIE-1  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Now, run xauth add and use your cookie as the argument/input.

pi@server0 ~ $ xauth add raspberrypi/unix:0  MIT-MAGIC-COOKIE-1  xxxxxxxxxxxxxxxxxxxxxxx
pi@server0 ~ $

After you hit enter, it shouldn't give any output. Try running your app again.