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Shows how to use the StreamSocket Socket Activity Stream API to keep a socket connection alive beyond the lifetime of the application.

Socket activity trigger stream socket sample

Shows how to use the StreamSocket Socket Activity Stream API to keep a socket connection alive beyond the lifetime of the application.

Note: This sample is part of a large collection of UWP feature samples. You can download this sample as a standalone ZIP file from docs.microsoft.com, or you can download the entire collection as a single ZIP file, but be sure to unzip everything to access shared dependencies. For more info on working with the ZIP file, the samples collection, and GitHub, see Get the UWP samples from GitHub. For more samples, see the Samples portal on the Windows Dev Center.

This sample connects to a server listening on TCP port 40404. The application can be terminated but the connection to the server will remain alive and will get background notifications if the server sends messages on the connection.

This sample requires the following capabilities:

  • Private Networks (Client & Server) - If the server it connects to is in intranet then it requires private Network capabilities.

For more information on network capabilities, see How to set network capabilities.

Note This sample is comprised of two apps: SocketActivityStreamSocket (client-side) and StreamSocketListenerServer (server-side). Due to loopback restrictions enforced by network isolation policy, these apps must run on separate machines for them to be able to communicate with each other. The sample scenario will not work if both apps are running on the same machine.

Alternatively, you can use the CheckNetIsolation.exe tool to remove the loopback restrictions for testing and debugging purposes.

Related topics

Other resources

Adding support for networking
How to configure network isolation capabilities

System requirements

Client: Windows 10

Server: Windows Server 2016 Technical Preview

Phone: Windows 10

Build the sample

  1. If you download the samples ZIP, be sure to unzip the entire archive, not just the folder with the sample you want to build.
  2. Start Microsoft Visual Studio and select File > Open > Project/Solution.
  3. Starting in the folder where you unzipped the samples, go to the Samples subfolder, then the subfolder for this specific sample, then the subfolder for your preferred language (C++, C#, or JavaScript). Double-click the Visual Studio Solution (.sln) file.
  4. Press Ctrl+Shift+B, or select Build > Build Solution.

Run the sample

The next steps depend on whether you just want to deploy the sample or you want to both deploy and run it.

Deploying the sample

  • Select Build > Deploy Solution.

Deploying and running the sample

  • To debug the sample and then run it, press F5 or use Debug > Start Debugging. To run the sample without debugging, press Ctrl+F5 or use Debug > Start Without Debugging.

This sample requires two computers that can connect to each other over a network. One computer will play the role of the client, while the other computer will play the role of the server.

To deploy this sample after building it, select Deploy Solution from the Build menu.

The sample must be deployed to both the client and server computers.

To run the sample, first the start the server app on the server computer. It will wait for the clients to connect.

After the server app has started, start the client app on the client computer.

  1. Specify the server name in the text box and click connect.

  2. Once a connection is established, you can terminate the client application.

Once the client is connected, you can send messages from the server application text box. The client displays received messages as toast notifications.