using System;
using System.Collections.Generic;
using System.Linq;
using System.Management;
using System.Text;
using System.Threading.Tasks;

namespace BalanceAdapter
{


    public delegate void DeviceChange(object sender, EventArrivedEventArgs e);

    /// <summary>
    /// 监听COM口设备变化
    /// </summary>
    public class SerialPortWatcher
    {
        private ManagementEventWatcher deviceWatcher = null;

        /// <summary>
        /// 设备监听
        /// </summary>
        private DeviceChange DeviceChangeEvent = null;

        /// <summary>
        /// 串口设备监听类
        /// </summary>
        /// <param name="deviceChange"></param>
        public SerialPortWatcher(DeviceChange deviceChangeEvent)
        {
            deviceWatcher = new ManagementEventWatcher("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2 or EventType = 3");
            //添加设备变化事件处理程序
            deviceWatcher.EventArrived += DeviceWatcher_EventArrived;
            //开始监听
            deviceWatcher.Start();

            this.DeviceChangeEvent = deviceChangeEvent;
        }

        private void DeviceWatcher_EventArrived(object sender, EventArrivedEventArgs e)
        {
            DeviceChangeEvent(sender, e);
        }
    }
}