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C#.NET U盤插拔監控

本文轉載自   查看原文   2015-01-30 08:52   2275 

【1】涉及的知識點

1) windows消息處理函數

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protected override void WndProc(ref Message m)

 

捕獲Message的系統硬件改變發出的系統消息

 

2) 硬件信息類

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DriveInfo


【2】核心函數

消息常量：

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/// <summary>
/// windows消息常量
/// </summary>
class CWndProMsgConst
{
     public const int WM_DEVICECHANGE = 0x219 ; // 系統硬件改變發出的系統消息
     public const int DBT_DEVICEARRIVAL = 0x8000 ; // 設備檢測結束，並且可以使用
     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 ; // 設備卸載或者拔出
     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 ;
}   


掃描函數：

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/// <summary>
/// 掃描U口設備
/// </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( "當前盤不能正確識別，請重新嘗試！" , "提示" , MessageBoxButtons.OK, MessageBoxIcon.Information);
             }
         }
     }
}


消息處理函數：

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public void FillData(Form form, Message m, ListBox listbox)
{
     _listbox = listbox;
     _form    = form;
 
     try
     {
         if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系統硬件改變發出的系統消息
         {
             switch (m.WParam.ToInt32())
             {
                 case CWndProMsgConst.WM_DEVICECHANGE:
                     break ;
                 //設備檢測結束，並且可以使用
                 case CWndProMsgConst.DBT_DEVICEARRIVAL:
                     {
                         ScanUSBDisk();
                         _listbox.Items.Clear();
                         foreach (string str in _usbdiskList)
                         {
                             _listbox.Items.Add(str);
                         }                               
                     }
                     break ;
                 // 設備卸載或者拔出
                 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( "當前盤不能正確識別，請重新嘗試！" , "提示" , MessageBoxButtons.OK, MessageBoxIcon.Information);
     }
}          


完整的CS封裝文件：

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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插拔監控類
     /// </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 ;
 
             // 達到間隔時發生
             timer.Elapsed += new System.Timers.ElapsedEventHandler(TimerList);
             timer.AutoReset = false ; // 僅在間隔第一次結束后引發一次         
         }
 
         public void FillData(Form form, Message m, ListBox listbox)
         {
             _listbox = listbox;
             _form    = form;
 
             try
             {
                 if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系統硬件改變發出的系統消息
                 {
                     switch (m.WParam.ToInt32())
                     {
                         case CWndProMsgConst.WM_DEVICECHANGE:
                             break ;
                         //設備檢測結束，並且可以使用
                         case CWndProMsgConst.DBT_DEVICEARRIVAL:
                             {
                                 ScanUSBDisk();
                                 _listbox.Items.Clear();
                                 foreach (string str in _usbdiskList)
                                 {
                                     _listbox.Items.Add(str);
                                 }                               
                             }
                             break ;
                         // 設備卸載或者拔出
                         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( "當前盤不能正確識別，請重新嘗試！" , "提示" , MessageBoxButtons.OK, MessageBoxIcon.Information);
             }
         }          
 
         /// <summary>
         /// 設置USB列表
         /// </summary>
         void TimerList(object sender, System.Timers.ElapsedEventArgs e)
         {
             ScanUSBDisk();
             foreach (string str in _usbdiskList)
             {
                 SetText(str);
             }
         }
 
         /// <summary>
         /// 掃描U口設備
         /// </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( "當前盤不能正確識別，請重新嘗試！" , "提示" , MessageBoxButtons.OK, MessageBoxIcon.Information);
                     }
                 }
             }
         }
 
         /// <summary>
         /// 設置List列表
         /// </summary>
         /// <param name="text">名稱
         public void SetText(string text)
         {
             if (_listbox == null )
                 return ;
 
             if ( this ._listbox.InvokeRequired) // 調用方位於創建控件所在的線程以外的線程中
             {
                 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 ; // 系統硬件改變發出的系統消息
         public const int DBT_DEVICEARRIVAL = 0x8000 ; // 設備檢測結束，並且可以使用
         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 ; // 設備卸載或者拔出
         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>


測試窗體（重寫消息函數）：

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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);
         }
     }
}


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