Cpp-TCP-Client

A simple TCP client implementation in C++ using the POSIX Socket API.

Overview

This project demonstrates the fundamentals of TCP client programming using POSIX sockets on Linux.

The application creates a TCP socket, connects to a server running on the local machine, and sends a text message over a reliable TCP connection.

This project is designed for educational purposes and serves as a foundation for learning socket programming in C++.

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Project Structure

cpp_sender_TCP/
│
└── main.cc

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Technologies

C++

• POSIX Sockets
• socket()
• connect()
• send()
• sockaddr_in
• inet_addr()
• htons()
• close()

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Communication

+----------------------+          TCP           +----------------------+
| C++ TCP Client       | --------------------> | TCP Server           |
| Linux / POSIX        |                       | Any TCP Server       |
+----------------------+                       +----------------------+

Default configuration:

Setting	Value
Protocol	TCP
IP Address	127.0.0.1
Port	2525

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How It Works

1. Create a TCP socket.
2. Configure the destination IPv4 address and port.
3. Connect to the TCP server.
4. Send a text message using send().
5. Close the socket.

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Example Output

Connected successfully!
Message sent!

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Learning Goals

This project demonstrates:

• Basic TCP socket programming
• TCP client implementation
• IPv4 networking
• Connection-oriented communication
• POSIX Socket API
• Sending data over TCP

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Notes

• This project implements only the client side of a TCP connection.
• A TCP server must already be running before executing the client.
• The default configuration uses the loopback interface (127.0.0.1) for local testing.
• This example focuses on the fundamentals of TCP client development.

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Future Improvements

• Receive data from the server
• Bidirectional communication
• Multi-message support
• IPv6 support
• Better error handling
• Binary data transfer

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Related Projects

• Socket-Programming
• TCP Server (C)
• UDP Example (C++ & C#)

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What is POSIX?

POSIX (Portable Operating System Interface) is a family of IEEE standards that defines a common programming interface for Unix-like operating systems.

This project uses the POSIX Socket API, including functions such as:

• socket()
• connect()
• send()
• close()

Because these APIs are standardized, the same networking code can typically be compiled and run on many Unix-like operating systems with little or no modification, including:

• Linux
• macOS
• FreeBSD
• OpenBSD
• NetBSD

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Output:

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Thanks

Mohammad Yousefi