Alex Lee的學習筆記

參考此篇而成

[C#]

        ManagementEventWatcher managementEventWatcher;
        delegate void UpdateListBoxDelegate(string data);
        UpdateListBoxDelegate updateDelegate;

        private void Form1_Load(object sender, EventArgs e)
        {
            managementEventWatcher = new ManagementEventWatcher("Select * From __InstanceOperationEvent WITHIN 10 WHERE TargetInstance ISA \"Win32_DiskDrive\"");

            managementEventWatcher.Start();
            managementEventWatcher.EventArrived += new EventArrivedEventHandler(managementEventWatcher_EventArrived);
            updateDelegate = new UpdateListBoxDelegate(UpdateListBox);

        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            managementEventWatcher.Stop();
        }

        private void managementEventWatcher_EventArrived(object sender, System.Management.EventArrivedEventArgs e)
        {
            ManagementBaseObject newEvent = e.NewEvent, newEventTarget = (newEvent["TargetInstance"] as ManagementBaseObject);
            if (newEventTarget["InterfaceType"].ToString() == "USB")
            {
                switch (newEvent.ClassPath.ClassName)
                {
                    case "__InstanceCreationEvent":
                        this.Invoke(updateDelegate, new object[] { Convert.ToString(newEventTarget["Caption"]) + " has been plugged in" });
                        break;
                    case "__InstanceDeletionEvent":
                        this.Invoke(updateDelegate, new object[] { Convert.ToString(newEventTarget["Caption"]) + " has been plugged out" });
                        break;
                }
            }
        }

        private void UpdateListBox(string data)
        {
            listBox1.Items.Add(data);
        }

 

[VB]

    Private WithEvents m_MediaConnectWatcher As ManagementEventWatcher
    Delegate Sub UpdateListBoxDelegate(ByVal data As String)
    Friend updateDelegte As UpdateListBoxDelegate
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        m_MediaConnectWatcher = New ManagementEventWatcher("SELECT * FROM __InstanceOperationEvent WITHIN 10 WHERE TargetInstance ISA ""Win32_DiskDrive""")
        m_MediaConnectWatcher.Start()
        updateDelegte = New UpdateListBoxDelegate(AddressOf UpdateListBox)
    End Sub


    Private Sub Arrived(ByVal sender As Object, ByVal e As System.Management.EventArrivedEventArgs) Handles m_MediaConnectWatcher.EventArrived

        Dim newEvent, newEventTarget As ManagementBaseObject

        newEvent = CType(e.NewEvent, ManagementBaseObject)
        newEventTarget = CType(newEvent("TargetInstance"), ManagementBaseObject)

        If newEventTarget("InterfaceType") = "USB" Then
            Select newEvent.ClassPath.ClassName
                Case "__InstanceCreationEvent"
                    Me.Invoke(updateDelegte, New Object() {Convert.ToString(newEventTarget("Caption")) & " has been plugged in"})
                Case "__InstanceDeletionEvent"
                    Me.Invoke(updateDelegte, New Object() {Convert.ToString(newEventTarget("Caption")) & " has been plugged out"})
            End Select
        End If
    End Sub

    Private Sub Form1_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
        m_MediaConnectWatcher.Stop()
    End Sub

    Private Sub UpdateListBox(ByVal data As String)
        ListBox1.Items.Add(data)
    End Sub