wmctrl access to window's titles

[David Andel]

Hi all

I have posted this question on qubes-users a while ago without any reaction. And since I am a developer myself I am asking here as well for a way to solve this problem.

I am a new user of Qubes OS and I would like to keep monitoring which windows are active as I am doing since years. For this I am using a very much simplified version of ulogme: https://github.com/karpathy/ulogme - I don't need all the graphical analysis stuff, basically just the logactivewin.sh script.

The problem now is that wmctrl does not show the titles of windows from domains other than dom0:

[david@com0 ~]$ wmctrl -l
0x01400004 -1 dom0 xfce4-panel
0x01a00003 -1 dom0 Desktop
0x02c00012  0 dom0 Qubes VM Manager
0x04a00004  0 dom0 Terminal
0x04800017  1  N/A N/A
0x0480001f  1  N/A N/A
0x04800020  1  N/A N/A
0x04e00018  3  N/A N/A

The most it shows is the domain and the application using WM_CLASS:

[david@dom0 ~]$ wmctrl -lx
0x01400004 -1 xfce4-panel.Xfce4-panel  dom0 xfce4-panel
0x01a00003 -1 xfdesktop.Xfdesktop   dom0 Desktop
0x02c00012  0 qubes-manager.Qubes-manager  dom0 Qubes VM Manager
0x04a00004  0 xfce4-terminal.Xfce4-terminal  dom0 Terminal
0x04800017  1 untrusted:Navigator.untrusted:Firefox   N/A N/A
0x0480001f  1 untrusted:Navigator.untrusted:Firefox   N/A N/A
0x04800020  1 untrusted:Navigator.untrusted:Firefox   N/A N/A
0x04e00018  3 personal:Navigator.personal:Firefox   N/A N/A
0x0480004f  1 untrusted:gnome-terminal-server.untrusted:Gnome-terminal   N/A N/A

The window manager in dom0 shows the full titles of open windows, therefore I don't understand why wmctrl does not show them.

What is the issue here and how can I solve it? Is there any other way to access the windows titles of all domains from dom0 programmatically?

Thanks

[Rusty Bird]

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David Andel:

> The problem now is that wmctrl does not show the titles of windows from
> domains other than dom0:

wmctrl hardcodes the type of the X11 atom WM_NAME to STRING, but it is
UTF8_STRING for VM windows. (See "wmctrl -lv" and get_window_title()
in main.c.)

Try "xdotool getactivewindow getwindowname". You may have to install
the xdotool Fedora package in dom0.

Rusty
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[David Andel]

Perfect! Thanks a lot!