powershell - 基于时间的while循环

Question

我一直在尝试使while和If循环正确地读取时间，但是当正确的时间到来时，它并没有结束程序。我尝试使用单引号''和双引号""以及不同的语法(例如(-eq，-match，-ne))来查看其中的任何一项是否有效……。

计划目标:循环播放直到凌晨07:00

# While the value is 1.
while ($value -ne 2)
{   
    # Value should be 1 in order to stay in loop.
    $value = 1

    # Get's the time in 24hr format
    $time = get-date -Format HH:mm:ss

    # For Debugging; Writes out Time
    Write-Output $time

    # Creates a Pop-Up Windows that prevents the computer from timing out; runs every 15 minutes.
    $wshell = New-Object -ComObject Wscript.Shell

    $wshell.Popup("Operation Completed",0,"Done",0x1)

    # Causes the Program to wait to send the Enter Keystroke.
    Sleep 4

    # Sends the Enter Keystroke.
    $wshell.sendkeys('~')

    # Causes the Program to wait to send the Enter Keystroke in seconds (900sec = 15 Minutes).
    Sleep 4

    # If Condition; If the time is over 2am then the program quits.
    If ($time -eq "02:03:00")
    {
        # While Loop End Condition
        $value = 2

        # "Debugging Output"
        Write-Output $value
        Write-Output $time
    }

    Else
    {
        # While Loop Condition
        $value = 1

        # "Debugging Output"
        Write-Output $value
        Write-Output $time
    }
}

# "Debugging Output"
Write-Output "End"
Write-Output $time
Write-Output $value

Answer 1

这种情况应该可以起作用:

if ((Get-Date) -gt (Get-Date -Hour 7 -Minute 0 -Second 0)) {
  # While Loop End Condition
  $value = 2
  # more actions 
}

它将当前时间与当前日期的 DateTime对象进行比较，但是时间设置为 07:00:00。

请记住两件事:

它将允许循环仅在午夜至7AM之间运行。如果要在调整条件的前一天启动脚本。

不使用if，但将条件直接放在while()中，这样可能会更具可读性:

while ((Get-Date) -lt (Get-Date -Hour 7 -Minute 0 -Second 0)) {
  # do something
}

目前，您正在检查确切的时间，因此从理论上讲可能会满足最终条件。但是，如果它在前后一秒到达该特定行，则不会停止循环。