Hi, I'm first here.
I'm currently trying to fallow chapter 3 step by step
and now I'm having trouble with the service forwarder port
in ServiceA.
I put this code at the top of the ServiceA class

// Create a port to access Service B,
// but we don't know where to send messages yet
serviceb.ServiceBOperations _servicebPort = null;

after adding other codes, I tried to build it but only can get
fallowing error message.

C:\Microsoft Robotics Studio (1.5)\projects\ServiceA\ServiceA.cs(39,12): error CS0234: The type or namespace name 'ServiceBOperations' does not exist in the namespace 'Robotics.ServiceB' (are you missing an assembly reference?)

I still don't know what I missing in the code.
I checked everything in the book with my code but found no missing parts.
Could you explain about the reason of the error and how to solve it?

It would seem that you haven't added the proxy for ServiceB in your references. Forgive me if I am mistaken.

I think what you need to do is:
1. Right click references and select "Add reference"
2. go to the "Browse" tab and navigate to the folder where the "ServiceB" project resides
3. Click on the folder and then navigate to the Proxy folder, then the OBJ folder, then the Debug folder (please note you have to have compiled the ServiceB project first) then select ServiceB.Y####.M##.proxy.dll
4. If that does not allow compilation, you need to add a using reference: 'using Robotics.ServiceB.proxy;' (that is, if the namespace in ServiceB is 'Robotics')

It is not likely that you are actually struggling with the ServiceForwarder, since that particular object belongs in the DsspServiceBase class, which every DSS inherits from.

I hope that answers your question.

-Quintin

Hello Quintin,
I already included the ServiceB proxy dll as reference to ServiceA.
As you mentioned I added the using declaration as:

but still doesn't work.
I only can suspect for now is that the reference cannot access to ServiceBOperations for some reason which I don't know.
There is no problem with compiling and running ServiceB, so I don't know what makes the problem.

Let me check again what I've been fallowing.
I added fallowing code
in just right below :
      public class SercieAService : DsspServiceBase
under Robotics.ServiceA namespace

Thanks for help,

Hmmm... I think it is a referencing issue - but without seeing code it is difficult.

In your using declaration, are you using ServiceB's proxy?
using Robotics.ServiceB.[u]proxy</u>;

Then you would get the operations by typing: Robotics.ServiceB.Proxy.ServiceBOperations;

Otherwise, host your code somewhere and I'll see if I can see what's going on. Have you tried compiling the author's code for this example? I checked it out and it works for me.

-Quintin (The University of Johannesburg)
Currently looking for affordable Russian (or equivalent) mail order bride. Must have masters level or higher in simulated robotics

Man. you exactly pointed out the problem.
I finally realized that I didn't put the using declaration correctly.
I should have put .Proxy at the end.
Now it's compiling ok.
Thanks,