using System;? using System.Collections.Generic;? using System.ComponentModel;? using System.Data;? using System.Drawing;? using System.Linq;? using System.Text;? using System.Threading.Tasks;? using System.Windows.Forms;? using System.IO;? //添加IO命名空間? namespace CheckUdisk? {? public partial class Form1 : Form? {? //定義常量? public const int WM_DEVICECHANGE = 0x219;? public const int DBT_DEVICEARRIVAL = 0x8000;? public const int DBT_CONFIGCHANGECANCELED = 0x0019;? public const int DBT_CONFIGCHANGED = 0x0018;? public const int DBT_CUSTOMEVENT = 0x8006;???????????? public const int DBT_DEVICEQUERYREMOVE = 0x8001;? public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;? public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;? public const int DBT_DEVICEREMOVEPENDING = 0x8003;? public const int DBT_DEVICETYPESPECIFIC = 0x8005;? public const int DBT_DEVNODES_CHANGED = 0x0007;? public const int DBT_QUERYCHANGECONFIG = 0x0017;? public const int DBT_USERDEFINED = 0xFFFF;? public Form1()? {? InitializeComponent();? }? private void Form1_Load(object sender, EventArgs e)? {? }? protected override void WndProc(ref Message m)? {? try? {? if (m.Msg == WM_DEVICECHANGE)? {? switch (m.WParam.ToInt32())? {? case WM_DEVICECHANGE:? break;? case DBT_DEVICEARRIVAL:? DriveInfo[] s = DriveInfo.GetDrives();? foreach (DriveInfo drive in s)? {? if (drive.DriveType == DriveType.Removable)? {? this.richTextBox1.AppendText("U盤已插入，盤符是" + drive.Name.ToString() + "\r\n");? break;? }? }? break;? case DBT_CONFIGCHANGECANCELED:? MessageBox.Show("2");? break;? case DBT_CONFIGCHANGED:? MessageBox.Show("3");? break;? case DBT_CUSTOMEVENT:? MessageBox.Show("4");? break;? case DBT_DEVICEQUERYREMOVE:? MessageBox.Show("5");? break;? case DBT_DEVICEQUERYREMOVEFAILED:? MessageBox.Show("6");? break;? case DBT_DEVICEREMOVECOMPLETE:? this.richTextBox1.AppendText("U盤已卸載");? break;? case DBT_DEVICEREMOVEPENDING:? MessageBox.Show("7");? break;? case DBT_DEVICETYPESPECIFIC:? MessageBox.Show("8");? break;? case DBT_DEVNODES_CHANGED:? MessageBox.Show("9");? break;? case DBT_QUERYCHANGECONFIG:? MessageBox.Show("10");? break;? case DBT_USERDEFINED:? MessageBox.Show("11");? break;? default:? break;? }? }? }? catch (Exception ex)? {? MessageBox.Show(ex.Message);? }? base.WndProc(ref m);? }? }? }

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