C#监控USB接口

该C#代码实现监控USB接口是否有设备接入或拨出，包括多个U盘。

 using System;
 using System.IO;
 using System.Runtime.InteropServices;
 using System.Windows.Forms;

 namespace MyApplication
 {
     public partial class Form1 : Form
     {
         const int WM_DEVICECHANGE = 0x0219; // 发生设备变动
         const int DBT_DEVICEARRIVAL = 0x8000; // 系统检测到一个新设备
         const int DBT_DEVTYP_VOLUME = 0x00000002; // 逻辑卷标
         const int DBT_CONFIGCHANGECANCELED = 0x0019;
         const int DBT_CONFIGCHANGED = 0x0018;
         const int DBT_CUSTOMEVENT = 0x8006;
         const int DBT_DEVICEQUERYREMOVE = 0x8001;
         const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002; // 系统完成移除一个设备
         const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
         const int DBT_DEVICEREMOVEPENDING = 0x8003;
         const int DBT_DEVICETYPESPECIFIC = 0x8005;
         const int DBT_DEVNODES_CHANGED = 0x0007;
         const int DBT_QUERYCHANGECONFIG = 0x0017;
         const int DBT_USERDEFINED = 0xFFFF;

         [StructLayout(LayoutKind.Sequential)]
         public struct DEV_BROADCAST_VOLUME
         {
             public int dbcv_size;
             public int dbcv_devicetype;
             public int dbcv_reserved;
             public int dbcv_unitmask;
         }

         public Form1()
         {
             InitializeComponent();
         }

         protected override void WndProc(ref Message m)
         {
             if (m.Msg == WM_DEVICECHANGE)
             {
                 switch (m.WParam.ToInt32())
                 {
                     case WM_DEVICECHANGE:
                         break;
                     case DBT_DEVICEARRIVAL://U disk upload
                         DriveInfo[] s = DriveInfo.GetDrives();
                         foreach (DriveInfo drive in s)
                         {
                             if (drive.DriveType == DriveType.Removable)
                             {
                                 Console.WriteLine("==================================================");
                                 Console.WriteLine("the U disk in! ，name:" + drive.Name.ToString());
                                 break;
                             }
                         }
                         Console.WriteLine("==================================================");
                         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 disk is out
                         DriveInfo[] I = DriveInfo.GetDrives();
                         foreach (DriveInfo DrInfo in I)
                         {
                             int devType = Marshal.ReadInt32(m.LParam, );
                             if (devType == DBT_DEVTYP_VOLUME)
                             {
                                 DEV_BROADCAST_VOLUME vol;
                                 vol = (DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));
                                 string ID = vol.dbcv_unitmask.ToString("x");
                                 Console.WriteLine(IO(ID) + ": U disk out！");
                             }
                         }
                         break;
                     case DBT_DEVICEREMOVEPENDING:
                         break;
                     case DBT_DEVICETYPESPECIFIC:
                         break;
                     case DBT_DEVNODES_CHANGED:
                         break;
                     case DBT_QUERYCHANGECONFIG:
                         break;
                     case DBT_USERDEFINED:
                         break;
                     default:
                         break;
                 }
             }
             base.WndProc(ref m);
         }

         public string IO(string IO)
         {
             string Value = "";
             switch (IO)
             {
                 case "":
                     Value = "A:";
                     break;
                 case "":
                     Value = "B:";
                     break;
                 case "":
                     Value = "C:";
                     break;
                 case "":
                     Value = "D:";
                     break;
                 case "":
                     Value = "E:";
                     break;
                 case "":
                     Value = "F:";
                     break;
                 case "":
                     Value = "G:";
                     break;
                 case "":
                     Value = "H:";
                     break;
                 case "":
                     Value = "I:";
                     break;
                 case "":
                     Value = "J:";
                     break;
                 case "":
                     Value = "K:";
                     break;
                 case "":
                     Value = "L:";
                     break;
                 case "":
                     Value = "M:";
                     break;
                 case "":
                     Value = "N:";
                     break;
                 case "":
                     Value = "O:";
                     break;
                 case "":
                     Value = "P:";
                     break;
                 case "":
                     Value = "Q:";
                     break;
                 case "":
                     Value = "R:";
                     break;
                 case "":
                     Value = "S:";
                     break;
                 case "":
                     Value = "T:";
                     break;
                 case "":
                     Value = "U:";
                     break;
                 case "":
                     Value = "V:";
                     break;
                 case "":
                     Value = "W:";
                     break;
                 case "":
                     Value = "X:";
                     break;
                 case "":
                     Value = "Y:";
                     break;
                 case "":
                     Value = "Z:";
                     break;
                 default: break;
             }
             return Value;
         }
     }
 }