DataChangedCallBack Error

[andrew_pj]

Hi,

I use V399a, and OpcDaCom communication.
I got error (DataChangedCallBack) everytime calling Application.exit()
I already put try catch statement though but doesn't stop the error.

Please advise regarding this, refer to attachment for details.
Thank you.

Best regards,
Andrew

[Archie]

It looks like a fix was put in for this for the next version:

Code: [Select]

    Private Sub DataChangedCallBack(ByVal clientHandle As Object, ByVal requestHandle As Object, ByVal values() As Opc.Da.ItemValueResult)
        For i = 0 To values.Length - 1
            Dim ReturnedValues() As String = {Convert.ToString(values(i).Value)}
            Dim PolledAddress As PolledAddressInfo
            Try
                PolledAddress = DirectCast(values(i).ClientHandle, PolledAddressInfo)
            Catch ex As Exception
                Exit Sub
            End Try


[andrew_pj]

It looks like a fix was put in for this for the next version:

Code: [Select]

    Private Sub DataChangedCallBack(ByVal clientHandle As Object, ByVal requestHandle As Object, ByVal values() As Opc.Da.ItemValueResult)
        For i = 0 To values.Length - 1
            Dim ReturnedValues() As String = {Convert.ToString(values(i).Value)}
            Dim PolledAddress As PolledAddressInfo
            Try
                PolledAddress = DirectCast(values(i).ClientHandle, PolledAddressInfo)
            Catch ex As Exception
                Exit Sub
            End Try


Solved! Thank you.