C#：基于WMI监视USB插拔

参考资料：

USB Port Insert / Remove detection using WMI

USB Port Insert / Remove detection using WMI (Source Code)

下载：

USBWatcher.zip

实现类代码：

USBWatcher.cs

/* ----------------------------------------------------------
文件名称：WMIUsbWatcher.cs

作者：秦建辉

MSN：splashcn@msn.com
QQ：36748897

博客：http://blog.youkuaiyun.com/jhqin

开发环境：
    Visual Studio V2010
    .NET Framework 4 Client Profile

版本历史：
    V1.1    2011年08月19日
            增加对插拔USB设备的定位
 
    V1.0	2011年08月18日
			基于WMI实现对插拔USB设备的监视
------------------------------------------------------------ */
using System;
using System.Management;

namespace Splash.IO.PORTS
{
    /// <summary>
    /// USB控制设备类型
    /// </summary>
    public struct USBControllerDevice
    {
        /// <summary>
        /// USB控制器设备ID
        /// </summary>
        public String Antecedent;

        /// <summary>
        /// USB即插即用设备ID
        /// </summary>
        public String Dependent;
    }

    /// <summary>
    /// 监视USB插拔
    /// </summary>
    public partial class USB
    {        
        /// <summary>
        /// USB插入事件监视
        /// </summary>
        private ManagementEventWatcher insertWatcher = null;

        /// <summary>
        /// USB拔出事件监视
        /// </summary>
        private ManagementEventWatcher removeWatcher = null;

        /// <summary>
        /// 添加USB事件监视器
        /// </summary>
        /// <param name="usbInsertHandler">USB插入事件处理器</param>
        /// <param name="usbRemoveHandler">USB拔出事件处理器</param>
        /// <param name="withinInterval">发送通知允许的滞后时间</param>
        public Boolean AddUSBEventWatcher(EventArrivedEventHandler usbInsertHandler, EventArrivedEventHandler usbRemoveHandler, TimeSpan withinInterval)
        {
            try
            {
                ManagementScope Scope = new ManagementScope("root\\CIMV2");
                Scope.Options.EnablePrivileges = true;

                // USB插入监视
                if (usbInsertHandler != null)
                {   
                    WqlEventQuery InsertQuery = new WqlEventQuery("__InstanceCreationEvent",
                        withinInterval,
                        "TargetInstance isa 'Win32_USBControllerDevice'");

                    insertWatcher = new ManagementEventWatcher(Scope, InsertQuery);
                    insertWatcher.EventArrived += usbInsertHandler;
                    insertWatcher.Start();
                }

                // USB拔出监视
                if (usbRemoveHandler != null)
                {   
                    WqlEventQuery RemoveQuery = new WqlEventQuery("__InstanceDeletionEvent",
                        withinInterval,
                        "TargetInstance isa 'Win32_USBControllerDevice'");

                    removeWatcher = new ManagementEventWatcher(Scope, RemoveQuery);
                    removeWatcher.EventArrived += usbRemoveHandler;
                    removeWatcher.Start();
                }

                return true;
            }

            catch (Exception)
            {
                RemoveUSBEventWatcher();
                return false;
            }
        }

        /// <summary>
        /// 移去USB事件监视器
        /// </summary>
        public void RemoveUSBEventWatcher()
        {
            if (insertWatcher != null)
            {
                insertWatcher.Stop();
                insertWatcher = null;
            }

            if (removeWatcher != null)
            {
                removeWatcher.Stop();
                removeWatcher = null;
            }
        }        

        /// <summary>
        /// 定位发生插拔的USB设备
        /// </summary>
        /// <param name="e">USB插拔事件参数</param>
        /// <returns>发生插拔现象的USB控制设备ID</returns>
        public static USBControllerDevice[] WhoUSBControllerDevice(EventArrivedEventArgs e)
        {
            ManagementBaseObject mbo = e.NewEvent["TargetInstance"] as ManagementBaseObject;
            if (mbo != null && mbo.ClassPath.ClassName == "Win32_USBControllerDevice")
            {
                String Antecedent = (mbo["Antecedent"] as String).Replace("\"", String.Empty).Split(new Char[] { '=' })[1];
                String Dependent = (mbo["Dependent"] as String).Replace("\"", String.Empty).Split(new Char[] { '=' })[1];
                return new USBControllerDevice[1] { new USBControllerDevice { Antecedent = Antecedent, Dependent = Dependent } };
            }

            return null;
        }
    }
}

调用示例（线程安全）：

using System;
using System.Windows.Forms;
using System.Management;
using Splash.IO.PORTS;

namespace Splash
{
    public partial class Form1 : Form
    {
        USB ezUSB = new USB();
      
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ezUSB.AddUSBEventWatcher(USBEventHandler, USBEventHandler, new TimeSpan(0, 0, 3));
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            ezUSB.RemoveUSBEventWatcher();
        }

        private void USBEventHandler(Object sender, EventArrivedEventArgs e)
        {
            if (e.NewEvent.ClassPath.ClassName == "__InstanceCreationEvent")
            {
                this.SetText("USB插入时间：" + DateTime.Now + "\r\n");
            }
            else if (e.NewEvent.ClassPath.ClassName == "__InstanceDeletionEvent") 
            {
                this.SetText("USB拔出时间：" + DateTime.Now + "\r\n");
            }

            foreach (USBControllerDevice Device in USB.WhoUSBControllerDevice(e))
            {
                this.SetText("\tAntecedent：" + Device.Antecedent + "\r\n");
                this.SetText("\tDependent：" + Device.Dependent + "\r\n");
            }
        }

        // 对 Windows 窗体控件进行线程安全调用
        private void SetText(String text)
        {
            if (this.textBox1.InvokeRequired)
            {
                this.textBox1.BeginInvoke(new Action<String>((msg) =>  
                {
                    this.textBox1.AppendText(msg);  
                }), text);  
            }
            else
            {
                this.textBox1.AppendText(text);
            }
        }
    }
}

演示界面：