C# 監聽USB

1.         public const int WM_DEVICECHANGE = 0x219;
2.         public const int DBT_DEVICEARRIVAL = 0x8000;
3.         public const int DBT_CONFIGCHANGECANCELED = 0x0019;
4.         public const int DBT_CONFIGCHANGED = 0x0018;
5.         public const int DBT_CUSTOMEVENT = 0x8006;
6.         public const int DBT_DEVICEQUERYREMOVE = 0x8001;
7.         public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;
8.         public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
9.         public const int DBT_DEVICEREMOVEPENDING = 0x8003;
10.         public const int DBT_DEVICETYPESPECIFIC = 0x8005;
11.         public const int DBT_DEVNODES_CHANGED = 0x0007;
12.         public const int DBT_QUERYCHANGECONFIG = 0x0017;
13.         public const int DBT_USERDEFINED = 0xFFFF;
15.         public Form1()
16.         {
17.             InitializeComponent();
18.         }
20.         private void Form1_Load(object sender, EventArgs e)
21.         {
23.         }
25.         protected override void WndProc(ref   Message m)
26.         {
27.             try
28.             {
29.                 if (m.Msg == WM_DEVICECHANGE)
30.                 {
31.                     switch (m.WParam.ToInt32())
32.                     {
33.                         case WM_DEVICECHANGE:
34.                             break;
35.                         case DBT_DEVICEARRIVAL://U盤插入   
36.                             DriveInfo[] s = DriveInfo.GetDrives();
37.                             foreach (DriveInfo drive in s)
38.                             {
39.                                 if (drive.DriveType == DriveType.Removable)
40.                                 {
41.                                     listBox1.Items.Add("U盤已插入，盤符爲:"
42.                                                        + drive.Name.ToString());
43.                                     break;
44.                                 }
45.                             }
46.                             break;
47.                         case DBT_CONFIGCHANGECANCELED:
48.                             break;
49.                         case DBT_CONFIGCHANGED:
50.                             break;
51.                         case DBT_CUSTOMEVENT:
52.                             break;
53.                         case DBT_DEVICEQUERYREMOVE:
54.                             break;
55.                         case DBT_DEVICEQUERYREMOVEFAILED:
56.                             break;
57.                         case DBT_DEVICEREMOVECOMPLETE:   //U盤卸載   
58.                             break;
59.                         case DBT_DEVICEREMOVEPENDING:
60.                             break;
61.                         case DBT_DEVICETYPESPECIFIC:
62.                             break;
63.                         case DBT_DEVNODES_CHANGED:
64.                             break;
65.                         case DBT_QUERYCHANGECONFIG:
66.                             break;
67.                         case DBT_USERDEFINED:
68.                             break;
69.                         default:
70.                             break;
71.                     }
72.                 }
73.             }
74.             catch (Exception ex)
75.             {
76.                 MessageBox.Show(ex.Message);
77.             }
78.             base.WndProc(ref   m);
79.         }