Databases
StackOverflow2013
Postsdbo
PO
Body
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    text
    copied!<p>The following class is used to monitor devices, you could use this to detect a USB device.</p> <pre><code>using System; using System.Collections.Generic; using System.Text; using System.Management; namespace DeviceMonitor.Event { /// &lt;summary&gt;Media watcher delegate.&lt;/summary&gt; /// &lt;param name="sender"&gt;&lt;/param&gt; /// &lt;param name="driveStatus"&gt;&lt;/param&gt; public delegate void MediaWatcherEventHandler(object sender, DeviceMonitor.Event.MediaEvent.DriveStatus driveStatus ); /// &lt;summary&gt;Class to monitor devices.&lt;/summary&gt; public class MediaEvent { #region Variables /*------------------------------------------------------------------------*/ private string m_logicalDrive; private ManagementEventWatcher m_managementEventWatcher = null; /*------------------------------------------------------------------------*/ #endregion #region Events /*------------------------------------------------------------------------*/ public event MediaWatcherEventHandler MediaWatcher; /*------------------------------------------------------------------------*/ #endregion #region Enums /*------------------------------------------------------------------------*/ /// &lt;summary&gt;The drive types.&lt;/summary&gt; public enum DriveType { Unknown = 0, NoRootDirectory = 1, RemoveableDisk = 2, LocalDisk = 3, NetworkDrive = 4, CompactDisk = 5, RamDisk = 6 } /// &lt;summary&gt;The drive status.&lt;/summary&gt; public enum DriveStatus { Unknown = -1, Ejected = 0, Inserted = 1, } /*-----------------------------------------------------------------------*/ #endregion #region Monitoring /*-----------------------------------------------------------------------*/ /// &lt;summary&gt;Starts the monitoring of device.&lt;/summary&gt; /// &lt;param name="path"&gt;&lt;/param&gt; /// &lt;param name="mediaEvent"&gt;&lt;/param&gt; 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 ); } } /// &lt;summary&gt;Stops the monitoring of device.&lt;/summary&gt; 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; /// &lt;summary&gt;Triggers the event when change on device occured.&lt;/summary&gt; /// &lt;param name="sender"&gt;&lt;/param&gt; /// &lt;param name="e"&gt;&lt;/param&gt; 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 ); } } } /// &lt;summary&gt;Gets the logical drive of a given path.&lt;/summary&gt; /// &lt;param name="path"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; 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 } } </code></pre> <p><b> Edit </b></p> <p>Extracted from <a href="http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/09912cee-4d2d-4efd-82a0-da20024b868b" rel="noreferrer">http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/09912cee-4d2d-4efd-82a0-da20024b868b</a></p>
 

Querying!

 
Guidance
An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload