Question

2

Detect screen-lock in shell/c++

rated 0 times [ 2] [ 0] / answers: 1 / hits: 1623 / 3 Years ago, mon, august 9, 2021, 6:42:40

I have a cross-platform application that runs on Ubuntu 14.04 (GNOME). There I need to determine if the screensaver is active or not and if the screen is locked or not.

I found out that I can get the screensaver info with: gnome-screensaver-command -q

But I cannot seem to figure out how I can detect a screen lock. For example on Unity I can use:

gdbus call -e -d com.canonical.Unity -o /com/canonical/Unity/Session -m com.canonical.Unity.Session.IsLocked

but that's a Unity-specific item. So any ideas on how to get this info on Gnome machines?

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ightrushi

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1 Year ago

answered 3 Years ago atereress · Accepted Answer

Found out that /org/gnome/SessionManager/Presence contains the current status of the user session.

It can be called by this:

gdbus call -e -d org.gnome.SessionManager -o /org/gnome/SessionManager/Presence -m org.freedesktop.DBus.Properties.Get /org/gnome/SessionManager/Presence status

Quick bash test:

#!/bin/bash

while true; do

 echo "PRESENCE "

gdbus call -e -d org.gnome.SessionManager -o /org/gnome/SessionManager/Presence -m org.freedesktop.DBus.Properties.Get /org/gnome/SessionManager/Presence status

        echo -e "

"

        sleep 1

done

For example in Qt:

QProcess process;

process.start("sh", QStringList() << "-c"<< "gdbus call -e -d org.gnome.SessionManager -o /org/gnome/SessionManager/Presence -m org.freedesktop.DBus.Properties.Get /org/gnome/SessionManager/Presence status");

process.waitForFinished();

result = QString::fromLatin1(process.readAllStandardOutput());

int state = result.remove("(<uint32 ").remove(">,)").toInt();

if(state != 0) {

    // user not active!

}