Memory corrupt when device operate

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VB

DLL

marshalling

Hi all,

I create a program to operate a device. The device is check acceptor. When the device is ready accepting, I place the check and the device will feed. But the exception raise after check is feeding "Attempt to read or write Protected Memory. This is often an indicating that other memory is corrupt".

How to solve this kind of problem.? My code to accept is below:

Public Shared Function StartAccepting(ByVal intTime As Integer) As Boolean
    Dim ret As Boolean
    Dim time As Integer = intTime
    Dim strTmp(300) As Byte
    Dim strStr As String
    Dim enc As New System.Text.ASCIIEncoding()
    Try
        ret = RunAccept(time, strTmp(0))
        strStr = enc.GetString(strTmp)
        If ret Then
            Return True
        Else
            Return False
        End If
    Catch ex As Exception
        MsgBox("Error opening:ExMsg-" & ex.Message)
        Return False
    End Try
End Function

Exception raise after the bold code. after it return..