Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
 
        Dim iod As New IODBPMC
        ReDim iod.cdata(4)
 
        iod.cdata(0) = 1
 
    End Sub

    <StructLayout(LayoutKind.Explicit)> Public Structure IODBPMC
        <FieldOffset(0)> Public type_a As Short    ' PMC address type 
        ' blahblahwoofwoof...
        <FieldOffset(8), MarshalAs(UnmanagedType.ByValArray, SizeConst:=5)> _
        Public ldata As Integer()
 
        Public Sub New(ByVal x As Integer)
            ReDim cdata(4)
            ReDim idata(4)
            ReDim ldata(4)
        End Sub
 
    End Structure
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
 
        Dim iod As New IODBPMC(0)
 
        iod.cdata(0) = 1
 
    End Sub

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Alle Angaben ohne Gewähr. Keine Haftung für Vorschläge, Tipps oder sonstige Hilfe, falls es schiefgeht, nur Zeit verschwendet oder man sonst nicht zufrieden ist