Скачать или смотреть How to Call a Function on a Server to Run Client-Side in C

Learn how to efficiently communicate with your TCP server in C, including sending data and processing responses without the need for Telnet.
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This video is based on the question https://stackoverflow.com/q/63323559/ asked by the user 'william_' ( https://stackoverflow.com/u/13414648/ ) and on the answer https://stackoverflow.com/a/63323799/ provided by the user 'Serge Ballesta' ( https://stackoverflow.com/u/3545273/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

As a university student venturing into the world of socket programming in C, you may face challenges when trying to create a client-side application that interacts smoothly with your server. You successfully set up a TCP server that case toggles every second string sent from a client, but now you're struggling to implement a client-side script. The main obstacles include connection management and effectively calling the server's processing functions.

In this guide, we'll walk through the steps you need to take to create a client that communicates with your server efficiently. We'll examine your existing code and provide tips on enhancing functionality, especially focusing on how to process strings via the client.

Understanding the Problem

You've correctly noted that while your server processes incoming connections and performs actions, your client script can connect but immediately closes the connection. This is a common issue when there is no mechanism to keep the connection alive or to send and process data effectively.

Key Issues:

The client connects to the server but closes prematurely.

Uncertainty about how to call the manageConnection function from the client.

Solution Overview

While it's impossible to directly invoke server-side functions from the client, communication can still be established through socket programming. The client sends data (like strings) to the server, which processes this data and then responds. Here’s how we can set up this functionality:

Steps to Create Your Client

Establish a Connection

Send Data

Receive Response

Iterate or Exit

1. Establish a Connection

In the existing client code, you've already set up the socket and tried to connect to the server. Here's a reminder of key connection setup code:

[[See Video to Reveal this Text or Code Snippet]]

2. Send Data

Once connected, you want to allow the user to enter a string for processing. You can achieve this through standard input (stdin). For example:

[[See Video to Reveal this Text or Code Snippet]]

This will read the user's input. The next step is to send this string to the server:

[[See Video to Reveal this Text or Code Snippet]]

3. Receive Response

After you've sent the data, the next step is to read the server’s response and display it. You can use the following code snippet:

[[See Video to Reveal this Text or Code Snippet]]

4. Iterate or Exit

To allow multiple string processing sessions, you can wrap the send and receive logic in a loop:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In this guide, we explored how to effectively communicate between a client and server using socket programming in C. While you cannot call server functions directly from the client, you can achieve similar results by sending data, receiving responses, and managing connections appropriately.

By following this structured approach, you will not only resolve the current issues but also enhance your fundamental understanding of network programming in C. Remember, practice is key to mastering this craft!

Feel free to ask your peers or instructors if you have more questions as you continue your learning journey in socket programming.