cant get custom logging plugin to work.   

Hello All.

Im using modified code from Windows Media Server SDK sample to create a 
plugin for direct logging to database. All elements of the code work except 
where it goes to get the logs from server, that part always ends up with a 
error no matter what is done.

Original SDK sample code file name: VBDBLoggingPlugin.vb

Enviroment;
Windows Server 2008 Enteprirse, Media Services for Server 2008, Visual 
Studio 2008

Namespace imports;
Imports WMSServerLib
Imports System.Text
Imports System.Runtime.InteropServices
Imports Microsoft.Win32

Calling code;

            CommandCtx.GetCommandRequest(CommandRequest)
            CommandRequest.GetIUnknownValue( "@WMS_COMMAND_CONTEXT_BODY", 
11, ContextBody, 0)
            NsBuffer = ContextBody
            If NsBuffer Is Nothing Then
                Exit Sub
            End If
            strContext = GetStringFromNSSBuffer(NsBuffer)

Function (where error occures) ;

    Private Function GetStringFromNSSBuffer(ByRef NsBuffer As INSSBuffer) As 
String
        Dim s As String = ""
        GetStringFromNSSBuffer = ""
        Try
            Dim uBufSize As UInt32
            Dim pbuf As IntPtr = New IntPtr()
            NsBuffer.GetBufferAndLength(pbuf, uBufSize)
            Dim iBufSize As Int32 = Convert.ToInt32(uBufSize) / 2
            s = Marshal.PtrToStringUni(pbuf, iBufSize)
            GetStringFromNSSBuffer = s
        Catch
        End Try
    End Function

Error;
Value does not fall within the expected range.

date: Tue, 29 Apr 2008 11:49:29 +0300   author:   Malrock 1001