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unity-如何检测屏幕是否被锁定？

tag-icon • tag-icon unity lock-screen screensaver detect
unity-如何检测屏幕是否被锁定？

这两种方法只有在锁定的屏幕变黑后才有效；但有时它们也会失败，当由于某种原因屏幕没有变黑时……

gnome-screensaver-command --query
gnome-screensaver-command --time

我也尝试过qdbus：

qdbus org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.GetActiveTime

但它同样失败了。

我刚刚发现，真正锁屏的是Unity！

qdbus com.canonical.Unity /com/canonical/Unity/Session com.canonical.Unity.Session.Lock

相关问题：
https://unix.stackexchange.com/questions/28181/run-script-on-screen-lock-unlock https://unix.stackexchange.com/questions/80143/how-to-create-a-daemon-which-would-be-listening-to-dbus-and-fire-script-on-messa

答案1

水瓶座力量的答案看起来效果很好。以下是我可能对他的解决方案做出的一些补充。

仅查询锁状态

如果您只需要一行代码来查询锁定状态，则如果锁定则应计算为 true，如果解锁则计算为 false。

isLocked=$(gdbus call -e -d com.canonical.Unity -o /com/canonical/Unity/Session -m com.canonical.Unity.Session.IsLocked | grep -ioP "(true)|(false)")

查询锁状态和跟踪自上次状态改变以来的时间

现在，如果您需要跟踪屏幕锁定的时间，您可能需要采取不同的方法。

#!/bin/bash
# To implement this, you can put this at the top of a bash script or you can run
# it the subshell in a separate process and pull the functions into other scripts.

# We need a file to keep track of variable inside subshell the file will contain
# two elements, the state and timestamp of time changed, separated by a tab.
# A timestamp of 0 indicates that the state has not changed since we started
# polling for changes and therefore, the time lapsed in the current state is
# unknown.
vars="/tmp/lock-state"

# start watching the screen lock state
(
    # set the initial value for lock state
    [ "$(gdbus call -e -d com.canonical.Unity -o /com/canonical/Unity/Session -m com.canonical.Unity.Session.IsLocked | grep -ioP "(true)|(false)")" == "true" ] && state="locked" || state="unlocked"
    printf "%s\t%d" $state 0 > "$vars"
    
    # start watching changes in state
    gdbus monitor -e -d com.canonical.Unity -o /com/canonical/Unity/Session | while read line
    do 
        state=$(grep -ioP "((un)?locked)" <<< "$line")
        # If the line read denotes a change in state, save it to a file with timestamp for access outside this subshell
        [ "$state" != "" ] && printf "%s\t%d" ${state,,} $(date +%s)> "$vars"
    done
) & # don't wait for this subshell to finish

# Get the current state from the vars exported in the subshell
function getState {
    echo $(cut -f1 "$vars")
}

# Get the time in seconds that has passed since the state last changed
function getSecondsElapsed {
    if [ $(cut -f2 "$vars") -ne 0 ]; then
        echo $(($(date +%s)-$(cut -f2 "$vars")))
    else
        echo "unknown"
    fi
}

本质上，此脚本会监视屏幕锁定状态的变化。发生更改时，时间和状态会转储到文件中。如果您愿意，可以手动读取此文件，或者使用我编写的函数。

如果您想要时间戳而不是秒数，请尝试：

date -ud @$(getSecondsElapsed) | grep -oP "(\d{2}:){2}\d{2}"

不要忘记-u强制日期程序忽略您的时区的开关。

答案2

屏幕实际上已被 Unity 锁定，我们需要使用gdbus

gdbus monitor -e -d com.canonical.Unity -o /com/canonical/Unity/Session

这将显示它何时被锁定，如下所示：

/com/canonical/Unity/Session: com.canonical.Unity.Session.LockRequested ()
/com/canonical/Unity/Session: com.canonical.Unity.Session.Locked ()
/com/canonical/Unity/Session: com.canonical.Unity.Session.UnlockRequested ()
/com/canonical/Unity/Session: com.canonical.Unity.Session.Unlocked ()

答案3

我也有类似的问题这里

我得到的帮助与 Aquarius Power 之前所说的类似，只是它包含在一个可以在后台运行的 bash scrip 守护程序中。我发现它非常有用。所以，看看我的问题和答案，看看这是否也对你有帮助。

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