我們的winforms應用程序支持使用製造商SDK的自定義控制器,但不支持檢測設備是否存在。如何檢查給定的USB設備是否插入?如何檢查給定的USB設備是否插入?
10
A
回答
6
以下類用於監視設備,您可以使用它來檢測USB設備。
using System;
using System.Collections.Generic;
using System.Text;
using System.Management;
namespace DeviceMonitor.Event
{
/// <summary>Media watcher delegate.</summary>
/// <param name="sender"></param>
/// <param name="driveStatus"></param>
public delegate void MediaWatcherEventHandler(object sender, DeviceMonitor.Event.MediaEvent.DriveStatus driveStatus);
/// <summary>Class to monitor devices.</summary>
public class MediaEvent
{
#region Variables
/*------------------------------------------------------------------------*/
private string m_logicalDrive;
private ManagementEventWatcher m_managementEventWatcher = null;
/*------------------------------------------------------------------------*/
#endregion
#region Events
/*------------------------------------------------------------------------*/
public event MediaWatcherEventHandler MediaWatcher;
/*------------------------------------------------------------------------*/
#endregion
#region Enums
/*------------------------------------------------------------------------*/
/// <summary>The drive types.</summary>
public enum DriveType
{
Unknown = 0,
NoRootDirectory = 1,
RemoveableDisk = 2,
LocalDisk = 3,
NetworkDrive = 4,
CompactDisk = 5,
RamDisk = 6
}
/// <summary>The drive status.</summary>
public enum DriveStatus
{
Unknown = -1,
Ejected = 0,
Inserted = 1,
}
/*-----------------------------------------------------------------------*/
#endregion
#region Monitoring
/*-----------------------------------------------------------------------*/
/// <summary>Starts the monitoring of device.</summary>
/// <param name="path"></param>
/// <param name="mediaEvent"></param>
public void Monitor(string path, MediaEvent mediaEvent)
{
if(null == mediaEvent)
{
throw new ArgumentException("Media event cannot be null!");
}
//In case same class was called make sure only one instance is running
/////////////////////////////////////////////////////////////
this.Exit();
//Keep logica drive to check
/////////////////////////////////////////////////////////////
this.m_logicalDrive = this.GetLogicalDrive(path);
WqlEventQuery wql;
ManagementOperationObserver observer = new ManagementOperationObserver();
//Bind to local machine
/////////////////////////////////////////////////////////////
ConnectionOptions opt = new ConnectionOptions();
//Sets required privilege
/////////////////////////////////////////////////////////////
opt.EnablePrivileges = true;
ManagementScope scope = new ManagementScope("root\\CIMV2", opt);
try
{
wql = new WqlEventQuery();
wql.EventClassName = "__InstanceModificationEvent";
wql.WithinInterval = new TimeSpan(0, 0, 1);
wql.Condition = String.Format(@"TargetInstance ISA 'Win32_LogicalDisk' and TargetInstance.DeviceId = '{0}'", this.m_logicalDrive);
this.m_managementEventWatcher = new ManagementEventWatcher(scope, wql);
//Register async. event handler
/////////////////////////////////////////////////////////////
this.m_managementEventWatcher.EventArrived += new EventArrivedEventHandler(mediaEvent.MediaEventArrived);
this.m_managementEventWatcher.Start();
}
catch(Exception e)
{
this.Exit();
throw new Exception("Media Check: " + e.Message);
}
}
/// <summary>Stops the monitoring of device.</summary>
public void Exit()
{
//In case same class was called make sure only one instance is running
/////////////////////////////////////////////////////////////
if(null != this.m_managementEventWatcher)
{
try
{
this.m_managementEventWatcher.Stop();
this.m_managementEventWatcher = null;
}
catch {}
}
}
/*-----------------------------------------------------------------------*/
#endregion
#region Helpers
/*-----------------------------------------------------------------------*/
private DriveStatus m_driveStatus = DriveStatus.Unknown;
/// <summary>Triggers the event when change on device occured.</summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MediaEventArrived(object sender, EventArrivedEventArgs e)
{
// Get the Event object and display it
PropertyData pd = e.NewEvent.Properties["TargetInstance"];
DriveStatus driveStatus = this.m_driveStatus;
if(pd != null)
{
ManagementBaseObject mbo = pd.Value as ManagementBaseObject;
System.IO.DriveInfo info = new System.IO.DriveInfo((string)mbo.Properties["DeviceID"].Value);
driveStatus = info.IsReady ? DriveStatus.Inserted : DriveStatus.Ejected;
}
if(driveStatus != this.m_driveStatus)
{
this.m_driveStatus = driveStatus;
if(null != MediaWatcher)
{
MediaWatcher(sender, driveStatus);
}
}
}
/// <summary>Gets the logical drive of a given path.</summary>
/// <param name="path"></param>
/// <returns></returns>
private string GetLogicalDrive(string path)
{
System.IO.DirectoryInfo dirInfo = new System.IO.DirectoryInfo(path);
string root = dirInfo.Root.FullName;
string logicalDrive = root.Remove(root.IndexOf(System.IO.Path.DirectorySeparatorChar));
return logicalDrive;
}
/*-----------------------------------------------------------------------*/
#endregion
}
}
編輯
+6
如果此代碼不是您的,請給出歸屬地。它看起來像是從http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/09912cee-4d2d-4efd-82a0-da20024b868b直接翻錄的,因爲它甚至包含存在的外框錯誤那裏。 – SqlRyan 2009-06-28 02:37:46
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民調USB系統中提取? – dusoft 2009-06-26 12:55:41