.NET Conversions - VB.NET Detect CD-ROM Insert and Eject

Detect CD_ROM actions - C# to VB.NET


Listed below is code used to detect the insertion into or ejection from a CDROM device. The original C# code can be found at http://www.publicjoe.f9.co.uk/csharp/snip/snip002.html. To run the code below a reference to the system.management dll must be added and the project must be set up to run as a Console application with the startup object set to Sub Main.


Imports System
Imports System.Management

Class WMIEvent

    Shared Sub Main(ByVal args() As String)
        Dim we As New WMIEvent
        Dim w As ManagementEventWatcher = Nothing
        Dim q As WqlEventQuery
        Dim observer As New ManagementOperationObserver

        ' Bind to local machine
        Dim opt As New ConnectionOptions
        opt.EnablePrivileges = True 'sets required privilege
        Dim scope As New ManagementScope("root\CIMV2", opt)

            q = New WqlEventQuery
            q.EventClassName = "__InstanceModificationEvent"
            q.WithinInterval = New TimeSpan(0, 0, 1)

            ' DriveType - 5: CDROM
            q.Condition = "TargetInstance ISA 'Win32_LogicalDisk'" & _
                " and TargetInstance.DriveType = 5"
            w = New ManagementEventWatcher(scope, q)

            ' register async. event handler
            AddHandler w.EventArrived, AddressOf we.CDREventArrived

            ' Do something usefull,block thread for testing
        Catch e As Exception
        End Try

    End Sub 'Main

    ' Dump all properties
    Public Sub CDREventArrived(ByVal sender As Object, ByVal e As EventArrivedEventArgs)
        ' Get the Event object and display it
        Dim pd As PropertyData = e.NewEvent.Properties("TargetInstance")

        If Not (pd Is Nothing) Then
            Dim mbo As ManagementBaseObject = pd.Value '
            'ToDo: Error processing original source shown below
            '      {
            '        ManagementBaseObject mbo = pd.Value as ManagementBaseObject;
            '---------------------------------------------^--- Syntax error: ';' expected

            ' if CD removed VolumeName == null
            If Not (mbo.Properties("VolumeName").Value Is Nothing) Then
                Console.WriteLine("CD has been inserted")
                Console.WriteLine("CD has been ejected")
            End If
        End If

    End Sub 'CDREventArrived
End Class 'WMIEvent
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