使用 WMI 监控驱动器

Question

我正在尝试监控本地电脑的驱动器。我对两个事件感兴趣：驱动器连接（USB 驱动器、CD-ROM、网络驱动器等）和断开连接时。我使用 ManagementOperationObserver 编写了一个快速概念证明，它部分有效。现在（使用下面的代码），我收到了各种事件。我只想获取驱动器连接和断开连接时的事件。有没有办法在 Wql 查询中指定这一点？

谢谢！

    private void button2_Click(object sender, EventArgs e)
    {
        t = new Thread(new ParameterizedThreadStart(o =>
        {
            WqlEventQuery q;
            ManagementOperationObserver observer = new ManagementOperationObserver();

            ManagementScope scope = new ManagementScope("root\\CIMV2");
            scope.Options.EnablePrivileges = true;

            q = new WqlEventQuery();
            q.EventClassName = "__InstanceOperationEvent";
            q.WithinInterval = new TimeSpan(0, 0, 3);
            q.Condition = @"TargetInstance ISA 'Win32_LogicalDisk' ";
            w = new ManagementEventWatcher(scope, q);

            w.EventArrived += new EventArrivedEventHandler(w_EventArrived);
            w.Start();
        }));

        t.Start();
    }

    void w_EventArrived(object sender, EventArrivedEventArgs e)
    {
        //Get the Event object and display its properties (all)
        foreach (PropertyData pd in e.NewEvent.Properties)
        {
            ManagementBaseObject mbo = null;
            if ((mbo = pd.Value as ManagementBaseObject) != null)
            {
                this.listBox1.BeginInvoke(new Action(() => listBox1.Items.Add("--------------Properties------------------")));
                foreach (PropertyData prop in mbo.Properties)
                    this.listBox1.BeginInvoke(new Action<PropertyData>(p => listBox1.Items.Add(p.Name + " - " + p.Value)), prop);
            }
        }
    }

Answer 1

你快到了。要区分连接到计算机的驱动器和被删除的驱动器，您需要检查 e.NewEvent 是否是 __InstanceCreationEvent 或 __InstanceDeletionEvent 分别。大致思路如下：

ManagementBaseObject baseObject = (ManagementBaseObject) e.NewEvent;

if (baseObject.ClassPath.ClassName.Equals("__InstanceCreationEvent"))
    Console.WriteLine("A drive was connected");
else if (baseObject.ClassPath.ClassName.Equals("__InstanceDeletionEvent"))
    Console.WriteLine("A drive was removed");

此外，您还可以通过 TargetInstance 属性获取 Win32_LogicalDisk 实例。

ManagementBaseObject logicalDisk = 
               (ManagementBaseObject) e.NewEvent["TargetInstance"];

Console.WriteLine("Drive type is {0}", 
                  logicalDisk.Properties["DriveType"].Value);