Win：使用 PowerShell 检查无线信号的强弱

1、确认正在连接到无线信号的强弱：

netsh wlan show interfaces

   

   在 PowerShell 中，直接显示信号的强弱：

(netsh wlan show interfaces) -Match '^\s+Signal' -Replace '^\s+Signal\s+:\s+',''

2、当连接信号小于等于 30%，则在通知栏中显示弹出窗口：

   $cur_strength=(netsh wlan show interfaces) -Match '^\s+Signal' -Replace '^\s+Signal\s+:\s+','' | Out-String

   If ($cur_strength.replace('%','') –le 30)

   {

     Add-Type -AssemblyName System.Windows.Forms

     $global:balmsg = New-Object System.Windows.Forms.NotifyIcon

     $path = (Get-Process -id $pid).Path

     $balmsg.Icon = [System.Drawing.Icon]::ExtractAssociatedIcon($path)