IMAPI2 in VB 2008 progress bar

Question

I start making program that will burn CD/DVDs, and everything is okay. I found way to burn with IMAPI2 API, but now I have problem: I can't get progress bar of that burning. Here is code:

Dim CDD1 As New IMAPI2.MsftDiscMaster2
Dim CDD2 As New IMAPI2.MsftDiscRecorder2

Dim FSI As New IMAPI2FS.MsftFileSystemImage
Dim CDD3 As New IMAPI2.MsftDiscFormat2Data

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim Index = 0
    Dim UniqueID = ""
    Dim Directory
    Dim Path = "C:\lll"
    Dim result
    Dim Stream

    Label1.Text = "----- Started -----."

    UniqueID = CDD1.Item(Index)
    Label1.Text = Label1.Text & vbCrLf & "ID found: " & UniqueID

    CDD2.InitializeDiscRecorder(UniqueID)
    Label1.Text = Label1.Text & vbCrLf & "Recorder selected!"

    Directory = FSI.Root
    Label1.Text = Label1.Text & vbCrLf & "Directory is here: " & Directory.ToString

    CDD3.Recorder = CDD2
    Label1.Text = Label1.Text & vbCrLf & "Recorder 2 selected!"

    CDD3.ClientName = "IMAPI2 TEST"
    Label1.Text = Label1.Text & vbCrLf & "Client Name Selected!"

    FSI.ChooseImageDefaults(CDD2)
    Label1.Text = Label1.Text & vbCrLf & "Default selected!"

    Directory.AddTree(Path, False)
    Label1.Text = Label1.Text & vbCrLf & "Directory added!"

    result = FSI.CreateResultImage()
    Stream = result.ImageStream

    Label1.Text = Label1.Text & vbCrLf & "Writing content to disc..."

    If (CDD3.IsCurrentMediaSupported(CDD2) = True) Then
        If (CDD3.IsRecorderSupported(CDD2) = True) Then

            CDD3.Write(Stream)

        Else
            MsgBox("Not Suported Recorder!")
        End If
    Else
        MsgBox("Not Suported Media!")
    End If

    Label1.Text = Label1.Text & vbCrLf & "----- Finished -----"

End Sub

When command

CDD3.Write(Stream)

is triggered, program freeze, and don't respond until data is burned completely.

Is there any way to stop this, to stop program freezing and enabling progress bar?

Thanks.

Answer 1

You need to use threading. So in your button click event handler you start off a new thread that does the actual burning and while that's going on in it's separate thread, the main thread can continue to update the GUI (including your progress bar).

See Thread.Start for a simple sample and if you want further information I'd suggest starting here: Managed Threading