如何在PowerShell中停止包含start-sleep的while($ true) [英] How to stop while($true) that contains start-sleep in powershell

问题描述

我的Google-fu让我失败了.我有一个非常简单的脚本，该脚本仅测试从一台服务器到另一台服务器的ping连接，并在顶部显示一个运行时.

My google-fu has failed me. I've got a pretty simple script that just tests ping connectivity from one server to another, and displays a runtime at the top.

我希望能够通过一次按键(脚本中的"q")随时停止该脚本，并提供一些基本统计信息，说明运行了多长时间以及失败了多少次.

I'd like to be able to stop this script at any time with a single keypress ("q" in the script) and have it give some basic stats about how long it ran, and how many times it failed.

我可以使用ctrl + c停止脚本，但是该脚本完全退出了，并且不允许我显示任何统计信息.下面是我的脚本.感谢您的帮助！

I can stop the script with ctrl+c, but that completely exits and doesn't allow me to show any stats. Below is my script. Any help is appreciated!

###############SETTINGS##########################

#Server to Ping:
$RemoteMachine = "ServerNameorIP"

#Seconds between each ping:
$PingInterval = 5

#File to log results:
$outFile = "C:\PingLog\"+$today+".PingLog.txt"

##################################################


$today = Get-Date -Format "yyyy-MM-dd"

#start a stopwatch for the progress bar
$elapsedTime = [system.diagnostics.stopwatch]::StartNew()

while ($true)
    {
   #Stick a progress bar at the top that shows elapsed time and how often we're pinging:
   write-progress -activity "Now testing ping connectivity to $RemoteMachine every $PingInterval seconds.  Press q to quit." -status "$([string]::Format("Time Elapsed: {0:d2}:{1:d2}:{2:d2}", $elapsedTime.Elapsed.hours, $elapsedTime.Elapsed.minutes, $elapsedTime.Elapsed.seconds))"

   $pingFails = 0

    #If the ping test fails, say something, and write it out to a log
    if(!(Test-Connection -ComputerName bb-ts-db -Quiet))
        {
        $pingFails++
        $dropTime = Get-Date -Format "MM/dd/yyyy - HH:mm:ss"
        Add-Content -Path $outfile -value ("Connection Lost at:  $dropTime")
        Echo "Connection Lost at $dropTime"
        }


    #Exit the loop if a key is pressed:
    if ($Host.UI.RawUI.KeyAvailable -and ("q" -eq $Host.UI.RawUI.ReadKey("IncludeKeyUp,NoEcho").Character)) 
    {
        Write-Host "Exiting now, don't try to stop me...." -Background DarkRed
        break;
    }

    #Wait the preset amount of time between each ping loop
    Start-Sleep $pingInterval
}


$elapsedTime.stop()

#Display the stats of this session:
echo "Test runtime:       $elapsedTime.Elapsed"
echo "# of failed pings:  $pingFails"

#If there WERE ping fails, write stats to $outFile
if($pingFails -gt 0)
{
    Add-content -Path $outfile -value "`n `n `n"
    Add-content -Path $outfile -value "Test runtime:       $elapsedTime.Elapsed"
    Add-content -Path $outfile -value "# of failed pings:  $pingFails"
}

推荐答案

以下是使用[console] :: KeyAvailable方法的简单示例.为了使它可用，您将不得不更频繁地唤醒循环，并且仅在每10次唤醒(或如此)后执行ping操作. (如果有道理.)

Here is a simple example of using the [console]::KeyAvailable method. To make it usable, you will have to wake up your loop more often, and only execute ping on every 10th (,or so) wake up. (If that makes sense.)

$continue = $true
while($continue)
{
    if ([console]::KeyAvailable)
    {
        echo "Exit with `"q`"";
        $x = [System.Console]::ReadKey() 

        switch ( $x.key)
        {
            q { $continue = $false }
        }
    } 
    else
    {
        # Your while loop commands go  here......
        Start-Sleep -Milliseconds 500
    }    
}

注意:不幸的是[console] :: KeyAvailable在PowerShelISE主机中不起作用，因此调试:(

Note: Unfortunately [console]::KeyAvailable does not work in PowerShelISE host so it is a pain to debug :(

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