Re: Windows Service Remoting Question
From: Chris Q. (ChrisQ_at_discussions.microsoft.com)
Date: 10/27/04
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Date: Wed, 27 Oct 2004 08:19:16 -0700
Ken,
I really appreciate your help. Once I removed the TCPListener.StartListening
and TCPListerner.StopListening methods everything began working perfectly.
Thank you so much! This has been a 14 hours stumbling block for me.
I did included the registration of the objects in the OnStart method because
all the examples I have seen do this. However, the same examples show a call
to the StartListening and StopListening methods.
Later!
Chris
"Ken Kolda" wrote:
> The first problem I see is that you should not be calling the
> StartListening() method on the TCPListener object. The remoting framework
> will take care of that for you. What I'm guessing is that when you call this
> an exception occurs and it calls OnStop() (which, I'm guessing, stops the
> TCPListener from listening). Why you don't see anything in the event log I'm
> not sure. Do you see the "Application Server Registered" entry in the log
> after the remote object is registered?
>
> Also, you don't show this but I assume this code is on the OnStart() method
> of the service class (which is good). If not, you should either put it there
> or somewhere else you can ensure will only run once.
>
> Ken
>
>
> "Chris Q." <ChrisQ@discussions.microsoft.com> wrote in message
> news:CAF9682A-C592-4FDE-BB1D-9199DA588284@microsoft.com...
> > The service is written to write notification events into the application
> > event log, and there are no events indicating that the service is not
> > running. I'm using Try...Catch blocks to write events to the log if any
> > problems occur.
> >
> > Here is the working console server:
> > Sub Main()
> > Dim TCPListener As TcpChannel
> > TCPListener = New TcpChannel(2550)
> > ChannelServices.RegisterChannel(TCPListener)
> >
> > Try
> > RemotingConfiguration.ApplicationName = "ResumeServer"
> >
> >
> RemotingConfiguration.RegisterWellKnownServiceType(GetType(ApplicantServer),
> > "applicants.rem", WellKnownObjectMode.SingleCall)
> > Configuration.WriteEvent("Applicant Server Registered",
> > EventLogEntryType.Information, 50090)
> > Catch rex As RemotingException
> > Configuration.WriteEvent(rex.Message, EventLogEntryType.Error,
> > 50010)
> > Catch ex As Exception
> > Configuration.WriteEvent(ex, EventLogEntryType.Error, 50000)
> > End Try
> >
> > Try
> > TCPListener.StartListening(Nothing)
> > Configuration.WriteEvent("The Resumè server is listening on
> port
> > 2550" & vbCrLf & URLList.ToString, EventLogEntryType.Information, 0)
> > Catch ex As Exception
> > Configuration.WriteEvent(ex, EventLogEntryType.Error, 50020)
> > End Try
> > Console.ReadLine()
> > TCPListener.StopListening(Nothing)
> > End Sub
> >
> > Here is the working console client:
> > Sub Main()
> > Dim ServerClient As TFF.ResumeManager.IApplicant =
> > Activator.GetObject(GetType(TFF.ResumeManager.IApplicant),
> > "http://localhost:2550/ResumeServer/applicants.rem")
> >
> > Try
> > Dim ApplicantList As DataSet =
> > ServerClient.LoadApplicantList(True)
> > Console.WriteLine(ApplicantList.ToString())
> > Catch ex As System.Net.Sockets.SocketException
> > Console.WriteLine(ex.Message)
> > Console.WriteLine(ex.StackTrace)
> > Catch ex As System.Net.WebException
> > Console.WriteLine(ex.Message)
> > Console.WriteLine(ex.StackTrace)
> > Catch ex As Exception
> > Console.WriteLine(ex.Message)
> > Console.WriteLine(ex.StackTrace)
> > End Try
> > Console.ReadLine()
> > End Sub
> >
> > Here is the service that is not currently working:
> > TCPListener = New HttpChannel(2550)
> > ChannelServices.RegisterChannel(TCPListener)
> >
> > Try
> > RemotingConfiguration.ApplicationName = "ResumeServer"
> >
> >
> RemotingConfiguration.RegisterWellKnownServiceType(GetType(ApplicantServer),
> > "applicants.rem", WellKnownObjectMode.SingleCall)
> > ServerUtility.WriteEvent("Applicant Server Registered",
> > EventLogEntryType.Information, 50090)
> > Catch rex As RemotingException
> > ServerUtility.WriteEvent("Line 76",
> EventLogEntryType.Information)
> > ServerUtility.WriteEvent(rex.Message, EventLogEntryType.Error,
> > 50010)
> > Catch ex As Exception
> > ServerUtility.WriteEvent("Line 78",
> EventLogEntryType.Information)
> > ServerUtility.WriteEvent(ex, EventLogEntryType.Error, 50000)
> > Finally
> > Me.OnStop()
> > End Try
> >
> > Try
> > TCPListener.StartListening(Nothing)
> > ServerUtility.WriteEvent("The Resumè server is listening on
> port
> > 2550" & vbCrLf & URLList.ToString, EventLogEntryType.Information, 0)
> > Catch ex As Exception
> > ServerUtility.WriteEvent("Line 96",
> EventLogEntryType.Information)
> > ServerUtility.WriteEvent(ex, EventLogEntryType.Error, 50020)
> > OnStop()
> > End Try
> >
> > The activator on the client works fine until I call a method on the
> remoting
> > object which is inheriting from MarshalByRef. I get a null reference from
> the
> > service server. I get a dataset from the console server.
> >
> > Thanks for any assistance.
> >
> > "Ken Kolda" wrote:
> >
> > > A few questions/comments:
> > >
> > > 1) Does your service start and stay running or does it terminate
> immediately
> > > after starting?
> > > 2) Assuming the service starts, can you connect to the port it's using
> via
> > > telnet to verify the server is listening for connections?
> > > 3) You must be getting some kind of exception, either from the server or
> > > from the client when you attempt to connect. Can you post that in its
> > > entirety?
> > >
> > > If you could post the code of your service class, that would help too.
> Don't
> > > post all your code -- just the class that derives from ServiceBase and
> only
> > > the code that registers the channel and any remoting objects.
> > >
> > > Ken
> > >
> > >
> > > "Chris Q." <ChrisQ@discussions.microsoft.com> wrote in message
> > > news:B7C9538A-992A-4CDF-843F-7099819DFEE9@microsoft.com...
> > > > I am designing a client/server application that will utilize remoting.
> I
> > > am
> > > > able to get things working without a problem using console
> applications,
> > > but
> > > > when I desire to create a windows service, I get all kinds of
> errors...
> > > none
> > > > of which are traceable.
> > > >
> > > > This is how I began the process. I first created the console server
> and
> > > the
> > > > console client. I verified that they are working properly with both
> TCP
> > > > channels and HTTP channels. However, when I take the exact same code
> and
> > > > place it into a windows service, I get no-descriptive errors and
> > > > connectionsink problems.
> > > >
> > > > I'm using well known single call objects on the server. The idea is to
> > > > contact the server to retrieve or save a dataset. This works
> beautifully
> > > with
> > > > the console apps either on a single machine or on seperate machines.
> > > However,
> > > > when I attempt to do the same task in a windows service on seperate
> > > machines,
> > > > I get the errors.
> > > >
> > > > Anyone run into similar problems?
> > > >
> > > > Thanks!
> > >
> > >
> > >
>
>
>
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