C#检测U盘插入拔出

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace CheckU
{
    public partial class Form1 : Form
    {
        public const int WM_DEVICECHANGE = 0x219;//U盘插入后，OS的底层会自动检测到，然后向应用程序发送“硬件设备状态改变“的消息
        public const int DBT_DEVICEARRIVAL = 0x8000;  //就是用来表示U盘可用的。一个设备或媒体已被插入一块，现在可用。
        public const int DBT_CONFIGCHANGECANCELED = 0x0019;  //要求更改当前的配置（或取消停靠码头）已被取消。
        public const int DBT_CONFIGCHANGED = 0x0018;  //当前的配置发生了变化，由于码头或取消固定。
        public const int DBT_CUSTOMEVENT = 0x8006; //自定义的事件发生。 的Windows NT 4.0和Windows 95：此值不支持。
        public const int DBT_DEVICEQUERYREMOVE = 0x8001;  //审批要求删除一个设备或媒体作品。任何应用程序也不能否认这一要求，并取消删除。
        public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;  //请求删除一个设备或媒体片已被取消。
        public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;  //一个设备或媒体片已被删除。
        public const int DBT_DEVICEREMOVEPENDING = 0x8003;  //一个设备或媒体一块即将被删除。不能否认的。
        public const int DBT_DEVICETYPESPECIFIC = 0x8005;  //一个设备特定事件发生。
        public const int DBT_DEVNODES_CHANGED = 0x0007;  //一种设备已被添加到或从系统中删除。
        public const int DBT_QUERYCHANGECONFIG = 0x0017;  //许可是要求改变目前的配置（码头或取消固定）。
        public const int DBT_USERDEFINED = 0xFFFF;  //此消息的含义是用户定义的

        public Form1()
        {
            InitializeComponent();
        }

        protected override void WndProc(ref Message m)
        {
            try
            {
                if (m.Msg == WM_DEVICECHANGE)
                {
                    switch (m.WParam.ToInt32())
                    {
                        case WM_DEVICECHANGE:
                            break;
                        case DBT_DEVICEARRIVAL://U盘插入
                            DriveInfo[] uin = DriveInfo.GetDrives();
                            foreach (DriveInfo drive in uin)
                            {
                                if (drive.DriveType == DriveType.Removable)
                                {
                                    listBox1.Items.Add("U盘已插入，盘符为:" + drive.Name.ToString());
                                    break;
                                }
                            }
                            break;
                        case DBT_CONFIGCHANGECANCELED:
                            break;
                        case DBT_CONFIGCHANGED:
                            break;
                        case DBT_CUSTOMEVENT:
                            break;
                        case DBT_DEVICEQUERYREMOVE:
                            break;
                        case DBT_DEVICEQUERYREMOVEFAILED:
                            break;
                        case DBT_DEVICEREMOVECOMPLETE: //U盘卸载
                            listBox1.Items.Add("U盘被拔出！");
                            break;
                        case DBT_DEVICEREMOVEPENDING:
                            break;
                        case DBT_DEVICETYPESPECIFIC:
                            break;
                        case DBT_DEVNODES_CHANGED:
                            break;
                        case DBT_QUERYCHANGECONFIG:
                            break;
                        case DBT_USERDEFINED:
                            break;
                        default:
                            break;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            base.WndProc(ref m);
        }

    }
}