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Deserializing Navision message in MSMQ

.net newbie using Visual Basic and MSMQ

         

kiwibrit

1:11 pm on Apr 21, 2010 (gmt 0)

10+ Year Member



I am new to asp.net 3.5 - but have managed to create a website which works well. Now, however, I need to send a non-transactional message, asking for a response, to MSMQ Private Me - and thereby to Navision - and read the response to a label. From various tests, I know I can send the message and get the response, but de-serializing it is another matter altogether.

From looking at a test response message in Private Queues
I know that the response comes in this format: 

FF FE 3C 00 3F 00 78 00 ÿþ<.?.x.

6D 00 6C 00 20 00 76 00 m.l. .v.

65 00 72 00 73 00 69 00 e.r.s.i.

6F 00 6E 00 3D 00 22 00 o.n.=.".

31 00 2E 00 30 00 22 00 1...0.".

20 00 65 00 6E 00 63 00 .e.n.c.

6F 00 64 00 69 00 6E 00 o.d.i.n.

67 00 3D 00 22 00 55 00 g.=.".U.

54 00 46 00 2D 00 31 00 T.F.-.1.

36 00 22 00 20 00 73 00 6.". .s.

74 00 61 00 6E 00 64 00 t.a.n.d.

61 00 6C 00 6F 00 6E 00 a.l.o.n.

65 00 3D 00 22 00 6E 00 e.=.".n.

6F 00 22 00 3F 00 3E 00 o.".?.>.

0D 00 0A 00 3C 00 58 00 ....<.X.

4D 00 4C 00 3E 00 0D 00 M.L.>...

0A 00 09 00 3C 00 42 00 ....<.B.

75 00 73 00 69 00 6E 00 u.s.i.n.

65 00 73 00 73 00 4F 00 e.s.s.O.

62 00 6A 00 65 00 63 00 b.j.e.c.

74 00 3E 00 67 00 65 00 t.>.g.e.

74 00 61 00 74 00 74 00 t.a.t.t.

72 00 69 00 62 00 75 00 r.i.b.u.

74 00 65 00 73 00 3C 00 t.e.s.<.

2F 00 42 00 75 00 73 00 /.B.u.s.

69 00 6E 00 65 00 73 00 i.n.e.s.

73 00 4F 00 62 00 6A 00 s.O.b.j.

65 00 63 00 74 00 3E 00 e.c.t.>.

0D 00 0A 00 09 00 3C 00 ......<.

41 00 74 00 74 00 72 00 A.t.t.r.

69 00 62 00 75 00 74 00 i.b.u.t.

65 00 73 00 3E 00 0D 00 e.s.>...

0A 00 09 00 09 00 3C 00 ......<.

43 00 6F 00 64 00 65 00 C.o.d.e.

3E 00 42 00 4F 00 54 00 >.B.O.T.

54 00 4F 00 4D 00 42 00 T.O.M.B.

4F 00 58 00 52 00 4F 00 O.X.R.O.

4C 00 4C 00 45 00 52 00 L.L.E.R.

53 00 49 00 5A 00 45 00 S.I.Z.E.

3C 00 2F 00 43 00 6F 00 <./.C.o.

64 00 65 00 3E 00 0D 00 d.e.>...

0A 00 09 00 09 00 3C 00 ......<.

44 00 65 00 73 00 63 00 D.e.s.c.

72 00 69 00 70 00 74 00 r.i.p.t.

69 00 6F 00 6E 00 3E 00 i.o.n.>.

42 00 6F 00 74 00 74 00 B.o.t.t.

6F 00 6D 00 20 00 42 00 o.m. .B.

6F 00 78 00 2F 00 52 00 o.x./.R.

6F 00 6C 00 6C 00 65 00 o.l.l.e.

72 00 20 00 53 00 69 00 r. .S.i.

7A 00 65 00 3C 00 2F 00 z.e.<./.

44 00 65 00 73 00 63 00 D.e.s.c.

72 00 69 00 70 00 74 00 r.i.p.t.

69 00 6F 00 6E 00 3E 00 i.o.n.>.

0D 00 0A 00 09 00 3C 00 ......<.

2F 00 41 00 74 00 74 00 /.A.t.t.

72 00 69 00 62 00 75 00 r.i.b.u.

74 00 65 00 73 00 3E 00 t.e.s.>.

0D 00 0A 00 3C 00 2F 00 ....<./.

58 00 4D 00 4C 00 3E 00 X.M.L.>.

0D 00 0A 00    ....


which throws me. I have tried out various ideas - I know the response can work with a COM object, but that is very slow, so I tried: 


 Try
   ' open the receive queue
   ResponseQueue = New _
    MessageQueue(".\private$\privateout")
   ResponseQueue.Formatter = New ActiveXMessageFormatter()
   ResponseQueue.MessageReadPropertyFilter.SetAll()
   Dim msg As New Message
   msg = ResponseQueue.Receive()
   msg.Formatter = New ActiveXMessageFormatter()
   Dim myObject As Object
   'type cast the message Body to Object Type
   myObject = DirectCast(msg.Body, Object)
   Dim xmlDoc As New System.Xml.XmlDocument()
   'load the xml string using XmlDOCument
   xmlDoc.LoadXml(myObject.ToString())
   Dim description As XmlNodeList = xmlDoc.GetElementsByTagName("Description")
   Label2.Text = description.Item(0).InnerXml
   

  Catch ex As Exception
   Label2.Text = ("Generic Exception was thrown: " _
    & ex.Source & ": " & ex.Message)
  End Try


But that got me the exception: System.Messaging: Cannot deserialize the message passed as an argument. Cannot recognize the serialization format.

I am very stuck - and would greatly appreciate some advice.

Ocean10000

1:58 pm on Apr 21, 2010 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



It looks like a UTF8 Encoded xml stream, with a few bytes upfront for length I am guessing. You might be able to read it in as a binary, skiping the initial bytes till you reach the first <, then dump it into an xml reader for further processing.

What type of application is filling the message Que a dot.net application or something else?

kiwibrit

2:50 pm on Apr 21, 2010 (gmt 0)

10+ Year Member



Thanks for coming back to me. The response queue is being filled by Microsoft Navsion.

I had a look at the binary formatter - I tried 

Try
   ' open the receive queue
   ResponseQueue = New _
    MessageQueue(".\private$\privateout")
   ResponseQueue.Formatter = New System.Messaging.BinaryMessageFormatter()
   ResponseQueue.MessageReadPropertyFilter.SetAll()
   Dim msg As New Message
   msg = ResponseQueue.Receive(New TimeSpan(0, 0, 30))
   Label2.Text = msg.Body
  Catch ex As Exception
   Label2.Text = ("Generic Exception was thrown: " _
    & ex.Source & ": " & ex.Message)
  End Try


Which I thought would convert the message body more or less as is into a label as text. The idea was to go one step at a time - refine into xmlreader and then filter once I knew I had something to handle. But once again I got System.Messaging: Cannot deserialize the message passed as an argument. Cannot recognize the serialization format.

Ocean10000

1:59 pm on Apr 22, 2010 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



Have you tried using the BodyStream object, which returns the result as a stream. Which I think will bypass the serialization problems, from what I am reading.

Message.BodyStream Property [msdn.microsoft.com]

kiwibrit

10:00 am on May 4, 2010 (gmt 0)

10+ Year Member



As far as I can figure that, that seems to apply to sending a message, rather then deserializing a message on receipt.

Ocean10000

2:26 pm on May 4, 2010 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



That is its primary use correct. But it might work for you to get raw access to the actual contents to work with the way you want to.

kiwibrit

1:16 pm on Jun 21, 2010 (gmt 0)

10+ Year Member



I couldn't find a way of using the BodyStream object satisfactorily. Bearing in mind that Navision vendor's experience of handling the message queue has been with a COM object, I wondered if my problem was related to this. I therefore tried: 

Dim msg As New Message
 msg = ResponseQueue.Receive()
 Try
 Dim formattedMessage As String
 Try
 msg.Formatter = New XmlMessageFormatter(New Type() {GetType(String)})
 formattedMessage = msg.Body.ToString()
 ' allow interoperability with applications that use the MSMQ COM control
 Catch generatedExceptionName As InvalidOperationException
 msg.Formatter = New ActiveXMessageFormatter()
 formattedMessage = CStr(msg.Body)
 End Try
 Label2.Text = formattedMessage

 Catch ex As Exception
 Label2.Text = ("Generic Exception was thrown: " & _
 ex.Source & ": " & ex.Message)
 End Try

But I was still unable to deserialize the code.

I then thought about the binary suggestion made in a post above, and tried 

 Dim msg As New Message
 msg = ResponseQueue.Receive()
 Try
  Dim formattedMessage As String
  msg.Formatter = New BinaryMessageFormatter()
  formattedMessage = msg.Body.ToString()
  Label2.Text = formattedMessage
 Catch ex As Exception
  Label2.Text = ("Generic Exception was thrown: " & _
  ex.Source & ": " & ex.Message)
 End Try

Somewhat to my surprise, I still got the error messages: Cannot deserialize the message passed as an argument. Cannot recognize the serialization format.

Struggling with this one.
 

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