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  • 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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    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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    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);
            }
        }
    }
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  • 原文地址：https://www.cnblogs.com/rr163/p/4259975.html
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