Pretty much I'm trying to replicate some of the functions from the VBS command line script in Visual Studio 2008, along with writing some of my own functions and hopefully bonding the control functions with some open source disk burning software. The plan is to make whatever I manage to get working free and open source.

So far, I've managed to make part of the program loop through the empty slots and check each one is empty, however I am experiencing continual crashes of the MediaTracker Professional software when I try to do a similar thing with used slots. Code snippet (In this case, VB.NET) below:


Imports mediatracker
Dim MTObject As New mediatracker
Dim SelectedOrganiser As mediatracker.MTOrganiser
Sub Main()
'I have multiple CenturionCD units and one Dischub, so ensure the Dischub is selected
For Each connectedOrganiser In MTObject.ConnectedOrganizers
If (connectedOrganiser.DriveCount() = 1) = True Then
Me.SelectedOrganiser = connectedOrganiser
Console.WriteLine("Selected DiscHub with drive letter " & SelectedOrganiser.DriveLetter(0).ToString() & ":")
End If
Next


This bit works fine, it detects which of my units is the DiscHub based on the fact it has a drive, and sets the global of SelectedOrganiser to the appropriate object.

The following bit of code also works fine when set directly after the above code

'Clear drive
If (SelectedOrganiser.IsDriveInUse(0)) Then
'Yes, it is..
SelectedOrganiser.EjectToCarousel(0)
End If


But when I place it inside a loop to check used slots, the MediaTracker software crashes. Example code:

Dim i As Integer
For i = 1 to SelectedOrganiser.UsedSlots.Count
'Clear drive
If (SelectedOrganiser.IsDriveInUse(0)) Then
'Yes, it is..
SelectedOrganiser.EjectToCarousel(0)
End If
Next


It seems to fail while evaluating the If statement, rather than when it tries to eject the disk to carousel, and thus far I have been unable to find any workarounds... Anyone have any ideas?

EDIT:
Am I right in assuming the DriveCount option will always be 1 for dischub units, given they only have a single drive in them? Are there any other values these might take?