Windows XP PC 锁定时 PowerShell 脚本将停止执行

Question

我有以下脚本，它可以连续执行 ping 并报告失败。它工作正常，只是当计算机锁定时循环似乎会“暂停”。我已通过启动脚本、立即锁定 PC、等待 10 分钟并查看已发生多少次 ping 来确认这一点。它远没有达到预期的数量。罪魁祸首可能是什么？

Write-Host "Entering monitoring loop..." -Background DarkRed

$ping   = new-object System.Net.NetworkInformation.Ping

$count_up  = 0
$count_dn  = 0
$count_dd  = 0

while ($true) {
    $result = $ping.send("10.1.1.1")

    if ($result.Status -eq "Success") {
        $count_up++
        $count_dd = 0
    }
    else {
        $count_dn++
        $count_dd++

        $this_date = Get-Date

        Write-Host "VPN ping failed at time " $this_date -Background Magenta

        if ($count_dd -gt 3) {
            Write-Host "***VPN is Down***" `a
            send_mail_notification("VPN is Down", "")
        }
    }

    if ($Host.UI.RawUI.KeyAvailable -and ("q" -eq $Host.UI.RawUI.ReadKey("IncludeKeyUp,NoEcho").Character)) {
        Write-Host "Exiting monitoring loop..." -Background DarkRed
        break;
    }

    Start-Sleep -m 250
}

$total = $count_up + $count_dn
$uptime = 100 * $count_up / $total

Write-Host $count_up " out of " $total " pings for a " $uptime "% uptime."