<DllImport("kernel32.dll")> Private Shared Function ReadFile( _
        ByVal hFile As Integer, ByVal lpBuffer As String, _
        ByVal nNumberOfBytesToRead As Integer, _
        ByRef lpNumberOfBytesRead As Integer, _
        ByRef lpOverlapped As OVERLAPPED) As Integer
        'ByVal hFile As Integer, ByVal Buffer As Byte(), _
    End Function

iRc = ReadFile(mhRS, rueck, Bytes2Read, iReadChars, Nothing)