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   源码介绍

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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;
using Microsoft.Win32;
using System.Runtime.InteropServices;
using System.Diagnostics;


namespace DectUsb
{
    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
        const int WM_SETTINGCHANGE = 0x001A;
        const int HWND_BROADCAST = 0xffff;

        IntPtr result1;

        public enum SendMessageTimeoutFlags : uint
        {
            SMTO_NORMAL = 0x0000,
            SMTO_BLOCK = 0x0001,
            SMTO_ABORTIFHUNG = 0x0002,
            SMTO_NOTIMEOUTIFNOTHUNG = 0x0008
        }

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern IntPtr SendMessageTimeout(
        IntPtr windowHandle,
        uint Msg,
        IntPtr wParam,
        IntPtr lParam,
        SendMessageTimeoutFlags flags,
        uint timeout,
        out IntPtr result
        );

        public void ChangeReg()
        {
            //通知所有打开的程序注册表以修改 
            SendMessageTimeout(new IntPtr(HWND_BROADCAST), WM_SETTINGCHANGE, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.SMTO_NORMAL, 1000, out result1);
        }
        //[DllImport("shell32.dll")]
        //public static extern void SHChangeNotify(uint wEventId, uint uFlags, IntPtr dwItem1, IntPtr dwItem2);
        public Form1()
        {
            InitializeComponent();
        }
        public void HidDisk(int n)
        {
            RegistryKey rgK = Registry.CurrentUser;
            RegistryKey rgK1 = rgK.OpenSubKey("Software", true);
            RegistryKey rgK2 = rgK1.OpenSubKey("Microsoft", true);
            RegistryKey rgK3 = rgK2.OpenSubKey("Windows", true);
            RegistryKey rgK4 = rgK3.OpenSubKey("CurrentVersion", true);
            RegistryKey rgK5 = rgK4.OpenSubKey("Policies", true);

            RegistryKey rgK6 = rgK5.CreateSubKey("Explorer");
            rgK6.SetValue("NoDrives", n);
            int intvalue = (int)rgK6.GetValue("NoDrives");
            rgK1.Close();
            rgK2.Close();
            rgK3.Close();
            rgK4.Close();
            rgK5.Close();
            rgK6.Close();
            MessageBox.Show(intvalue.ToString());
            //Process[] ExProcess = System.Diagnostics.Process.GetProcessesByName("Explorer.EXE");
            //foreach (Process p in ExProcess)
            //{
            //    p.Kill();
            //    p.WaitForExit();
            //    p.Close();
            //}
            //System.Threading.Thread.Sleep(10000);
            //Process pr = new Process();
            //ProcessStartInfo ps = new ProcessStartInfo("Explorer.exe");
            //pr.StartInfo = ps;
            //pr.Start(); 
            //SHChangeNotify(0x8000000, 0, IntPtr.Zero, IntPtr.Zero);
            ChangeReg();
        }

        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());
                                //    if ((drive.Name.ToString())=="K:\\")
                                //    {
                                //        HidDisk(16);
                                //    }
                                //    break;
                                    switch (drive.Name.ToString())
                                    {
                                        case "G:\\":
                                            HidDisk(64);
                                            break;
                                        case "H:\\":
                                            HidDisk(192);
                                            break;
                                        case "I:\\":
                                            HidDisk(384);
                                            break;
                                        case "J:\\":
                                            HidDisk(768);
                                            break;
                                        case "K:\\":
                                            HidDisk(1536);
                                            break;
                                        case "M:\\":
                                            HidDisk(3072);
                                            break;
                                        case "N:\\":
                                            HidDisk(6144);
                                            break;
                                        case "O:\\":
                                            HidDisk(12288);
                                            break;
                                        default:
                                            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);
        }
        
    }
}