Serialization question

[burak]

Hello,

 

I have the following web service

 

----------

Imports System.Web.Services

Imports System

Imports System.IO

Imports System.Runtime.Serialization.Formatters

Imports System.Runtime.Serialization.Formatters.Binary

Imports System.Runtime.Serialization.Formatters.Soap

 

<System.Web.Services.WebService

(Namespace := "http://tempuri.org/serv_serial/Service1")> _

Public Class Service1

Inherits System.Web.Services.WebService

 

<Serializable()> Class Employee

Public Name As String

Public Address As String

Public Salary As Double

End Class

 

<WebMethod()> _

Public Function Serialize(ByVal obj As Object) As Stream

Dim fs As FileStream = New _

FileStream("c:\\vbdata.xml", FileMode.OpenOrCreate,

FileAccess.ReadWrite, FileShare.ReadWrite)

Dim sFmt As SoapFormatter = New SoapFormatter

sFmt.Serialize(fs, obj)

Return fs

End Function

<WebMethod()> _

Public Function Deserialize(ByVal s As Stream) As Object

Dim fs As SoapFormatter = New SoapFormatter

s.Position = 0

Return fs.Deserialize(s)

End Function

<WebMethod()> _

Public Function GetEmployeeInfo() As Stream

Dim emp As Employee = New Employee

emp.Name = "Tim"

emp.Address = " First Street, Country "

emp.Salary = 10000.0

Dim s As FileStream = Serialize(emp)

Return s

End Function

 

End Class

 

-----------

 

I call this web service in the following manner

 

Imports System

'Imports System.IO

Imports System.Runtime.Serialization.Formatters

Imports System.Runtime.Serialization.Formatters.Binary

Imports System.Runtime.Serialization.Formatters.Soap

 

Public Class WebForm1

Inherits System.Web.UI.Page

 

 

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles MyBase.Load

'Put user code to initialize the page here

 

Dim x As New service_employee.Service1

 

Dim s As service_employee.Stream = x.GetEmployeeInfo()

 

Dim y As Object = x.Deserialize(s)

 

Response.Write(y.Name & "<BR>")

Response.Write(y.Address & "<BR>")

Response.Write(y.Salary & "<BR>")

 

End Sub

 

End Class

 

------

 

but for some reason, it is blowing up after GetEmployeeInfo is done.

 

Do you know why this is happening?

 

Thank you,

 

Burak

[PlausiblyDamp]

What error do you get? If you step through the code what do x, s and y equal at each step. Does any of them get set to nothing after the call to GetEmployeeInfo ? Edited October 28, 2006 by PlausiblyDamp

[burak]

Hi,

 

In the beginning x.url gets set to

 

"http://localhost/burak/serv_serial/Service1.asmx"

 

In the GetEmployeeInfo code, s gets set to

 

s.Length = 761

s.Name = "c\vbdata.xml"

 

and the type for s is "System.IO.FileStream".

 

It blows up after it comes out of GetEmployeeInfo.

 

Here is what gets returned

 

System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: System.IO.FileStream cannot be serialized because it does not have a default public constructor. at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference) at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type) at System.Xml.Serialization.XmlSerializationWriter.CreateUnknownTypeException(Type type) at System.Xml.Serialization.XmlSerializationWriter.CreateUnknownTypeException(Object o) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write2_Stream(String n, String ns, Stream o, Boolean isNullable, Boolean needType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write13_GetEmployeeInfoResponse(Object[] p) --- End of inner exception stack trace --- at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle) at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces) at System.Web.Services.Protocols.SoapServerProtocol.WriteReturns(Object[] returnValues, Stream outputStream) at System.Web.Services.Protocols.WebServiceHandler.WriteReturns(Object[] returnValues) at System.Web.Services.Protocols.WebServiceHandler.Invoke() --- End of inner exception stack trace ---

[PlausiblyDamp]

Ah, basically you can't return a Stream from a web service.

 

Could you not use a single method to open he stream and return the data i.e.

 

 _
Public Function Deserialize() As Object
Dim emp As Employee = New Employee
emp.Name = "Tim"
emp.Address = " First Street, Country "
emp.Salary = 10000.0
Dim s As FileStream = Serialize(emp)

Dim fs As SoapFormatter = New SoapFormatter
s.Position = 0
Return fs.Deserialize(s)
End Function

 

is there any reason the two functions where separate?

Edited May 21, 2007 by PlausiblyDamp

[burak]

Actually, I have a .net soap-client that needs to access a websphere soap-server.

 

I read somewhere that we have to

 

"generate the proxy(using wsdl.exe ) classes agains WEBSPHERE web services ".

 

I am new to .net and web services and don't know much about the wsdl.exe tool.

 

Can you tell me how I can generate this proxy class?

 

Thank you,

 

Burak

[PlausiblyDamp]

wsdl /l:vb

 

although from visual studio you can add a web reference and browse to the wsdl (or enter the url) and it will do it for you.

Edited May 21, 2007 by PlausiblyDamp

[burak]

That's what I thought. Thanks.