C#.NET U盘插拔监控

【1】涉及的知识点

1) windows消息处理函数

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1	protected override void WndProc(ref Message m)

捕获Message的系统硬件改变发出的系统消息

2) 硬件信息类

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1

DriveInfo

【2】核心函数

消息常量：

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/// <summary> /// windows消息常量 /// </summary> class CWndProMsgConst {     public const int WM_DEVICECHANGE = 0x219; // 系统硬件改变发出的系统消息     public const int DBT_DEVICEARRIVAL = 0x8000;// 设备检测结束，并且可以使用     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;// 设备卸载或者拔出     public const int DBT_DEVICEREMOVEPENDING = 0x8003;     public const int DBT_DEVICETYPEHANGED = 0x0007;     public const int DBT_QUERYCHANGSPECIFIC = 0x8005;     public const int DBT_DEVNODES_CECONFIG = 0x0017;     public const int DBT_USERDEFINED = 0xFFFF; }

扫描函数：

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/// <summary> /// 扫描U口设备 /// </summary> private void ScanUSBDisk() {     _usbdiskList.Clear();     DriveInfo[] drives = DriveInfo.GetDrives();       foreach (DriveInfo drive in drives)     {         if ((drive.DriveType == DriveType.Removable) && !drive.Name.Substring(0, 1).Equals("A"))         {             try             {                 _usbdiskList.Add(drive.Name);             }             catch             {                 MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);             }         }     } }

消息处理函数：

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public void FillData(Form form, Message m, ListBox listbox) {     _listbox = listbox;     _form    = form;       try     {         if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系统硬件改变发出的系统消息         {             switch (m.WParam.ToInt32())             {                 case CWndProMsgConst.WM_DEVICECHANGE:                     break;                 //设备检测结束，并且可以使用                 case CWndProMsgConst.DBT_DEVICEARRIVAL:                     {                         ScanUSBDisk();                         _listbox.Items.Clear();                         foreach (string str in _usbdiskList)                         {                             _listbox.Items.Add(str);                         }                                                    }                     break;                 // 设备卸载或者拔出                 case CWndProMsgConst.DBT_DEVICEREMOVECOMPLETE:                     {                         ScanUSBDisk();                         _listbox.Items.Clear();                         foreach (string str in _usbdiskList)                         {                             _listbox.Items.Add(str);                         }                     }                                               break;                 default:                     break;             }         }     }     catch (Exception ex)     {         MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);     } }

完整的CS封装文件：

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using System; using System.Collections.Generic; using System.Text; using System.Windows.Forms; using System.Threading; using System.IO;   namespace USBMonitor {     /// <summary>     /// USB插拔监控类     /// </summary>     public class CUSBMonitor     {         private delegate void SetTextCallback(string s);         private IList<string> _usbdiskList = new List<string>();         private ListBox _listbox = null;         private Form    _form  = null;           public CUSBMonitor()         {             System.Timers.Timer timer = new System.Timers.Timer(1000);             timer.Enabled = true;               // 达到间隔时发生             timer.Elapsed += new System.Timers.ElapsedEventHandler(TimerList);             timer.AutoReset = false; // 仅在间隔第一次结束后引发一次                  }           public void FillData(Form form, Message m, ListBox listbox)         {             _listbox = listbox;             _form    = form;               try             {                 if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系统硬件改变发出的系统消息                 {                     switch (m.WParam.ToInt32())                     {                         case CWndProMsgConst.WM_DEVICECHANGE:                             break;                         //设备检测结束，并且可以使用                         case CWndProMsgConst.DBT_DEVICEARRIVAL:                             {                                 ScanUSBDisk();                                 _listbox.Items.Clear();                                 foreach (string str in _usbdiskList)                                 {                                     _listbox.Items.Add(str);                                 }                                                            }                             break;                         // 设备卸载或者拔出                         case CWndProMsgConst.DBT_DEVICEREMOVECOMPLETE:                             {                                 ScanUSBDisk();                                 _listbox.Items.Clear();                                 foreach (string str in _usbdiskList)                                 {                                     _listbox.Items.Add(str);                                 }                             }                                                       break;                         default:                             break;                     }                 }             }             catch (Exception ex)             {                 MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);             }         }                     /// <summary>         /// 设置USB列表         /// </summary>         void TimerList(object sender, System.Timers.ElapsedEventArgs e)         {             ScanUSBDisk();             foreach (string str in _usbdiskList)             {                 SetText(str);             }         }           /// <summary>         /// 扫描U口设备         /// </summary>         private void ScanUSBDisk()         {             _usbdiskList.Clear();             DriveInfo[] drives = DriveInfo.GetDrives();               foreach (DriveInfo drive in drives)             {                 if ((drive.DriveType == DriveType.Removable) && !drive.Name.Substring(0, 1).Equals("A"))                 {                     try                     {                         _usbdiskList.Add(drive.Name);                     }                     catch                     {                         MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);                     }                 }             }         }           /// <summary>         /// 设置List列表         /// </summary>         /// <param name="text">名称         public void SetText(string text)         {             if (_listbox == null)                 return;               if (this._listbox.InvokeRequired) // 调用方位于创建控件所在的线程以外的线程中             {                 if (_listbox.Items.Contains(text))                     return;                   SetTextCallback d = new SetTextCallback(SetText);                 _form.Invoke(d, new object[] { text });             }             else             {                 if (_listbox.Items.Contains(text))                     return;                   this._listbox.Items.Add(text);             }         }     }       /// <summary>     /// windows消息常量     /// </summary>     class CWndProMsgConst     {         public const int WM_DEVICECHANGE = 0x219; // 系统硬件改变发出的系统消息         public const int DBT_DEVICEARRIVAL = 0x8000;// 设备检测结束，并且可以使用         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;// 设备卸载或者拔出         public const int DBT_DEVICEREMOVEPENDING = 0x8003;         public const int DBT_DEVICETYPEHANGED = 0x0007;         public const int DBT_QUERYCHANGSPECIFIC = 0x8005;         public const int DBT_DEVNODES_CECONFIG = 0x0017;         public const int DBT_USERDEFINED = 0xFFFF;     }    } </string></string>

测试窗体（重写消息函数）：

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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;   namespace USBMonitor {     public partial class Main : Form     {         public Main()         {             InitializeComponent();         }           CUSBMonitor usbMonitor = new CUSBMonitor();           protected override void WndProc(ref Message m)         {             usbMonitor.FillData(this, m, _listBox);               base.WndProc(ref m);         }     } }