I would like to host a service on a WinCE device. The WinCE device is the host which can be accessed(control and data acquisition) by multiple clients (PC or WinCE) over serial port, TCP, USB etc. I was considering using Protocol Buffers for serialization on the wire. It would be ideal to use WCF or remoting but as far as I see they are not implement on the Compact Framework. Anyone have any ideas how this can be achieved.
CF 3.5 has some WCF, but at current only the full-fat framework has WCF with the hooks to support swapping out the serializer on the fly. I know of some users who are using CF but passing a Stream over the wire (as far as WCF is concerned) and handling the protobuf-net (de)serialization outside of WCF (a byte[] may work similarly, but they chose Stream - I can't recall why- perhaps base-64 issues?). Would that help?
It's a blatant plug, I admit, but you might consider hosting a REST web service from the device.
Related
Is it possible to implement a RabbitMQ RPC between Java (acting as a client) and a .NET application (server/worker) using the RabbitMQ .NET library?
It seems like it should be possible, as RabbitMQ broker handles the queues and the socket connections are established between party and the RabbitMQ broker.
Are there any practical considerations in doing so?
The short answer is yes. In fact, my company uses RabbitMQ for that very reason - it offers a platform-neutral (as close as possible anyway) way to communicate between different applications. So in theory, I could have Java applications running on Linux and .NET applications running on Windows, and everything works together just fine.
You will need to come up with a common serialization format for your messages; I recommend using JSON as there are JSON libraries in every major programming language.
If you have any trouble with the RabbitMQ .NET library, feel free to post more questions :-)
We would like to develop WCF service for SL clients, which should support session management (PerSession) and callbacks. The WCF service would be hosted as a Windows service.
What would be best WCF binding choice (wsdual, pollingDuplex, any other)? Please also provide for/against points.
Regards,
There are no others. Silverlight does not support WSDualHttpBinding. You can choose PollingDuplexHttpBinding or PollingDuplexHttpBinding.
Have been working a little more in this area and it appears this is an area of constant and recent change. As of Silverlight 4, NetTcpTransport and HttpTransport are both supported using either text or binary encoding. It appears SL5 delivers further enhancements.
There is an interesting benchmark app here which allows you to profile relative performance of the two protocols. Though it was built for SL4, you can download, update the target framework to SL5 and see how it goes. It is a great way to make sure you've got everything setup properly.
Using NetTcpTransport should mean you can also use PerSession instancing on the server.
i'm going to build a instant messager
and now i have to decide how i implement the networking.
So far i only worked with Sockets (TCP or UDP). Now i heared about RMI (in Java) and want this in my C#-Chatapplication too.
There is .NET Remoting and WCF. I think building the instant messager with Sockets is not a good idea, right? But that should i use? .NET Remoting or WCF?
.NET Remoting seems to be the older technologie and is similar to Java RMI. I read that .NET Remoting is faster than WCT (article from 2007).
Which technologie should i use for my instant messager? I want to send formatted text from the richtextbox and inline images.
Furthermore i want to exchange files from chat-client to chat-client.
For .NET Remoting i found a tutorial which uses
ChannelServices.RegisterChannel(myChan);
But this is marked as obsolete. Is .NET Remoting a obsolete technologie?
Is it possible to send images and files with WCF or .NET Remoting or are Sockets the better choice?
I read that WCF is a collection of networking technologies (Web Services, Remoting, ...) but if i search for WCF and remote method invocation i only get examples for Web Services...
BTW: Later, i want to implement a Web-Client for my instant messager with ASP.NET. Are there some limitations respective to Networking (WCF/Remoting)?
Thank you :)
.NET Remoting is maintained for backward compatibility only as of .NET 3.0. Thus, if you are going to be using .NET 3.0 or greater, use WCF.
For your immediate use, I would suggest the NetTcpBinding. You can then select a more appropriate binding using the following chart.
.
Finally, to learn about WCF, refer to this SO question.
For your instant messager solution I would recommend WCF P2P here is an article to get you started Peer-to-Peer Programming with WCF and here it is an example of p2p on codeproject.
I need a way to exchange data between a process and a windows service.
The process (Windows Form Application, Console Application, in the future also a Web Solution) needs to instruct and interact with the windows service.
I want to know which way is the best to accompplish this.
I'll write the solution in C#, .NET Framework version does not matter.
In the past I've used Remoting (Activator), WCF Interface with Contracts, Inter Process Exchange IPC and some named pipe implementation. What is your experience? Other ways?
I would choose WCF. It is most modern and probably best supported approach at the moment. It "replaced" older technologies in most scenarios. Nice feature of the WCF is that if you need to move your service to other protocol you can do that simply in configuration.
If you expect that windows service will always run on the same machine as other application you can use WCF with netNamedBinding. If you decide to move your service to other machine you will have to change configuration (probably to netTcpBinding) because Named pipes in WCF are limited only to IPC.
My previous experiences have always been over an IPCChannel, mainly because the only code I've had to be involved in that does any form of inter-process communication. It's never caused me any problems and the code is working away quite merrily as I type.
The only real answer to this question is, whichever you're most comfortable with.
I am working on a project that involves an embedded system which runs a non-microsoft OS with a C program for the application and am developing .NET software for its end user applications. For remote configuring with the .NET software (which can go across firewalls), I am considering using WCF. I know only a little about WCF so far but I've read that it is supposed to be interoperable with environments other than .NET. The embedded environment has an HTTP stack but no built in support for web services. Does anyone have any experience with this kind of thing or know if it would be appropriate at all? If so please provide some advice or point me in the right direction.
Thanks!
WCF is interoperable because it's accessed over HTTP. Visual Studio can help you build client libraries very quickly for WCF, but client access to WCF doesn't require anything other than HTTP calls with the proper payload. If you're looking at a remote server call and your built-in support in your embedded environment is basic HTTP, look at building your server-side as REST-formatted methods. Your debugger will thank you.
What kinds of data are you planning on transferring back and forth? For something this low level and proprietary I would recommend sticking with good old fashioned Sockets.
I will be passing configuration data back and forth...basically to enable technical support staff to remotely program the device. If I were using sockets this could be binary data, but there is a requirement that customers with firewalls shouldn't need to open any ports. Because of this I was thinking of sending XML over HTTP. So, is it better to use WCF or REST on the server side? Or WCF with REST?
I'm curious about your "customers with firewalls" requirement. Sockets with binary data or XML over HTTP can use any port (not just port 80), and I'm curious if your device will be "listening" on the network, or just making an outbound connection. If your device is listening, you will need to open a port on the firewall. Making an outbound connection ("phoning home") is much easier on the firewall.
So I think you could use sockets and binary data. However, I have faced similar issues on the last two projects, and I really wanted to implement WCF using REST on the embedded device, but no one else wanted to do it - I'm hoping someone else will be first, and publish some results!
Good Luck! (and post your results!)