代码之家 › 专栏 › 技术社区 › Nathan Wheeler

检测可移动介质的弹出/插入

wmi c#

Nathan Wheeler · 技术社区 · 15 年前

我正在做一个项目,在这个项目中,我需要能够检测何时插入或移除CD或USB驱动器。我找到了一些源代码,本来应该可以做到这一点,但是,当我插入或弹出一张CD时,似乎什么都没有发生。

有人能验证一下来源是正确的吗?能给我一些关于我在这里可能做错了什么的线索吗?

public class MyWindow
{
    ManagementEventWatcher w;

    private void MyWindow_Loaded(object sender, RoutedEventArgs e)
    {
        WqlEventQuery query = new WqlEventQuery("__InstanceCreationEvent", new TimeSpan(0, 0, 1), @"TargetInstance ISA 'Win32_LogicalDisk' and TargetInstance.DriveType = 2");
        ConnectionOptions opt = new ConnectionOptions();
        opt.EnablePrivileges = true;

        ManagementScope ms = new ManagementScope("root\\CIMV2", opt);

        w = new ManagementEventWatcher(ms, query);

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

    private void w_EventArrived(object sender, EventArrivedEventArgs e)
    {
        PropertyData pd = e.NewEvent.Properties["TargetInstance"];
    }
}

当我在“propertydata pd=…”行上设置断点时,当我弹出/插入CD时,它永远不会被击中。因为我一点也没有搞砸,我在网上看到的所有例子都简单地引用了相同的源代码(有细微的变化)。

1 回复 | 直到 6 年前

Robert Harvey 6 年前

using System.Management;

public void networkDevice()
{
    try
    {
        WqlEventQuery q = new WqlEventQuery();
        q.EventClassName = "__InstanceModificationEvent";
        q.WithinInterval = new TimeSpan(0, 0, 1);
        q.Condition = @"TargetInstance ISA 'Win32_LogicalDisk' and TargetInstance.DriveType = 5";

        ConnectionOptions opt = new ConnectionOptions();
        opt.EnablePrivileges = true;
        opt.Authority = null;
        opt.Authentication = AuthenticationLevel.Default;
        //opt.Username = "Administrator";
        //opt.Password = "";
        ManagementScope scope = new ManagementScope("\\root\\CIMV2", opt);

        ManagementEventWatcher watcher = new ManagementEventWatcher(scope, q);
        watcher.EventArrived += new EventArrivedEventHandler(watcher_EventArrived);
        watcher.Start();
    }
    catch (ManagementException e)
    {
        Console.WriteLine(e.Message);
    }
}

void watcher_EventArrived(object sender, EventArrivedEventArgs e)
{
    ManagementBaseObject wmiDevice = (ManagementBaseObject)e.NewEvent["TargetInstance"];
    string driveName = (string)wmiDevice["DeviceID"];
    Console.WriteLine(driveName);
    Console.WriteLine(wmiDevice.Properties["VolumeName"].Value);
    Console.WriteLine((string)wmiDevice["Name"]);
    if (wmiDevice.Properties["VolumeName"].Value != null)
        Console.WriteLine("CD has been inserted");
    else
        Console.WriteLine("CD has been ejected");
}