unity - 如何检测屏幕是否被锁定？

Aquarius Power 的回答似乎很有效。以下是我可能对他的解决方案所做的一些补充。

仅查询锁定状态

如果您只需要一行代码来查询锁定状态，那么如果锁定，这应该评估为 true，如果解锁，则评估为 false。

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

查询自上次状态更改以来的锁定状态和跟踪时间

现在，如果您需要跟踪屏幕锁定了多长时间，您可能需要采用不同的方法。

#!/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，此脚本监视屏幕锁定状态的变化。发生更改时，时间和状态将转储到文件中。如果你喜欢或者使用我写的函数，你可以手动阅读这个文件。

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。

屏幕实际上被 Unity 锁定了，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：

/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 ()

我在这里有一个类似的问题

我得到的帮助与 Aquarius Power 之前所说的类似，只是它包含在一个 bash 脚本守护进程中，可以在后台运行。我发现它非常有帮助。所以，看看我的问题和答案，看看这是否对你也有帮助。