Powershell弹出消息，说明远程系统在指定时间后关闭

$timeout = 60  # 指定时间，单位为秒
$message = "远程系统将在 $timeout 秒后关闭，请保存您的工作。"  # 弹出消息内容

Add-Type -TypeDefinition @"
using System;
using System.Runtime.InteropServices;

public class MessageBox
{
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern int MessageBoxTimeout(IntPtr hWnd, string text, string caption, uint type, int milliseconds);
}
"@

$null = [MessageBox]::MessageBoxTimeout(0, $message, "系统提示", 0x40, $timeout * 1000)