最好的方法来检测dvd插入驱动器c#

Question

我尝试使用WMI检测磁盘驱动器中的新媒体插入，使用以下代码。但是有管理的解决方案，如使用循环在后台线程与DriveInfo.GetDrives?哪一种方法最好?当我尝试以下代码时，我得到"磁盘不在驱动器中，请插入磁盘"对话框，并在其他pc上重试和继续按钮?在许多机器上运行良好。

private void DriveWatcher()
{
    try
    {
        var wqlEventQuery = new WqlEventQuery
            {
                EventClassName = "__InstanceModificationEvent",
                WithinInterval = new TimeSpan(0, 0, 1),
                Condition =
                    @"TargetInstance ISA 'Win32_LogicalDisk' and TargetInstance.DriveType = 5"
            };
        var connectionOptions = new ConnectionOptions
            {
                EnablePrivileges = true,
                Authority = null,
                Authentication = AuthenticationLevel.Default
            };
        var managementScope = new ManagementScope("\root\CIMV2", connectionOptions);
        ManagementEventWatcher = new ManagementEventWatcher(managementScope, wqlEventQuery);
        ManagementEventWatcher.EventArrived += CdrEventArrived;
        ManagementEventWatcher.Start();
    }
    catch (ManagementException e)
    {
        MessageBox.Show(e.Message, e.GetType().ToString(), MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}
private void CdrEventArrived(object sender, EventArrivedEventArgs e)
{
    var wmiDevice = (ManagementBaseObject) e.NewEvent["TargetInstance"];
    if (wmiDevice.Properties["VolumeName"].Value != null)
        GetDrives();
    else
        GetDrives();
}
private void GetDrives()
{
    if (InvokeRequired)
    {
        Invoke(new GetDrivesDelegate(GetDrives));
    }
    else
    {
        toolStripComboBoxDrives.Items.Clear();
        DriveInfo[] drives = DriveInfo.GetDrives();
        _drives = new Dictionary<string, DriveInfo>();
        int selectedIndex = 0;
        foreach (DriveInfo drive in drives)
        {
            if (drive.DriveType.Equals(DriveType.CDRom))
            {
                if (drive.IsReady)
                {
                    string name = string.Format("{0} ({1})", drive.VolumeLabel, drive.Name.Substring(0, 2));
                    int selectedDrive = toolStripComboBoxDrives.Items.Add(name);
                    _drives.Add(name, drive);
                    selectedIndex = selectedDrive;
                }
                else
                {
                    toolStripComboBoxDrives.Items.Add(drive.Name);
                    _drives.Add(drive.Name, drive);
                }
            }
        }
        toolStripComboBoxDrives.SelectedIndex = selectedIndex;
    }
}

基本上我所做的是在表单加载事件称为驱动器观察者。因此，当磁盘插入时，准备好的磁盘将首先列在组合框中，用户可以轻松弹出驱动器。

Answer 1

你可以试试下面的代码:

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");
}

如果它在你的机器上工作，而在其他基于窗口的机器上不起作用，那么你必须重新构建/修复/重新注册该机器的WMI类。

Answer 2

我将采用以下解决方案。这是100%的管理解决方案。它没有使用WMI，而且工作得很好。

internal class DriveWatcher
{
    public delegate void OpticalDiskArrivedEventHandler(Object sender, OpticalDiskArrivedEventArgs e);
    /// <summary>
    ///     Gets or sets the time, in seconds, before the drive watcher checks for new media insertion relative to the last occurance of check.
    /// </summary>
    public int Interval = 1;
    private Timer _driveTimer;
    private Dictionary<string, bool> _drives;
    private bool _haveDisk;
    /// <summary>
    ///     Occurs when a new optical disk is inserted or ejected.
    /// </summary>
    public event OpticalDiskArrivedEventHandler OpticalDiskArrived;
    private void OnOpticalDiskArrived(OpticalDiskArrivedEventArgs e)
    {
        OpticalDiskArrivedEventHandler handler = OpticalDiskArrived;
        if (handler != null) handler(this, e);
    }
    public void Start()
    {
        _drives = new Dictionary<string, bool>();
        foreach (
            DriveInfo drive in
                DriveInfo.GetDrives().Where(driveInfo => driveInfo.DriveType.Equals(DriveType.CDRom)))
        {
            _drives.Add(drive.Name, drive.IsReady);
        }
        _driveTimer = new Timer {Interval = Interval*1000};
        _driveTimer.Elapsed += DriveTimerOnElapsed;
        _driveTimer.Start();
    }
    public void Stop()
    {
        if (_driveTimer != null)
        {
            _driveTimer.Stop();
            _driveTimer.Dispose();
        }
    }
    private void DriveTimerOnElapsed(object sender, ElapsedEventArgs elapsedEventArgs)
    {
        if (!_haveDisk)
        {
            try
            {
                _haveDisk = true;
                foreach (DriveInfo drive in from drive in DriveInfo.GetDrives()
                                            where drive.DriveType.Equals(DriveType.CDRom)
                                            where _drives.ContainsKey(drive.Name)
                                            where !_drives[drive.Name].Equals(drive.IsReady)
                                            select drive)
                {
                    _drives[drive.Name] = drive.IsReady;
                    OnOpticalDiskArrived(new OpticalDiskArrivedEventArgs {Drive = drive});
                }
            }
            catch (Exception exception)
            {
                Debug.Write(exception.Message);
            }
            finally
            {
                _haveDisk = false;
            }
        }
    }
}
internal class OpticalDiskArrivedEventArgs : EventArgs
{
    public DriveInfo Drive;
}

你可以这样使用

var driveWatcher = new DriveWatcher();
driveWatcher.OpticalDiskArrived += DriveWatcherOnOpticalDiskArrived;
driveWatcher.Start();
private void DriveWatcherOnOpticalDiskArrived(object sender, OpticalDiskArrivedEventArgs e)
{
    MessageBox.Show(e.Drive.Name);
}

Answer 3

参考代码:

foreach (DriveInfo drive in DriveInfo.GetDrives().Where(d => d.DriveType == DriveType.CDRom))  
    MessageBox.Show(drive.Name + " " + drive.IsReady.ToString());  

参考链接:

http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/1ecb74cd-d193-40f5-9aa3-47a3c9adb4ea/

堆栈链接:

检测光盘是否在DVD驱动器中