C#：基于WMI监视USB插拔

作者：Splash

转自：/article/2840080.html

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

[csharp]
view plaincopy

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

作者：秦建辉

MSN：splashcn@msn.com
QQ：36748897

博客：http://blog.csdn.net/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）：

[csharp]
view plaincopy

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：