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「鸿蒙网络编程系列 25」中的「TCP 回声服务器的实现」

在「鸿蒙网络编程系列」的 25 篇中，我们将学习如何在鸿蒙操作系统中实现 TCP 回声服务器。TCP（传输控制协议）是一种可靠的传输层协议，它为网络应用提供了端到端的数据传输服务。回声服务器是一种简单的网络服务，它接收客户端的请求并将其回复给客户端。在本文中，我们将详细介绍如何在鸿蒙操作系统中实现 TCP 回声服务器。

1. 环境准备

在开始编写代码之前，我们需要先确保我们的开发环境已经准备好。我们需要安装鸿蒙 SDK（Software Development Kit）并配置好开发环境。我们可以参考「鸿蒙网络编程系列 1」和「鸿蒙网络编程系列 2」来完成这些步骤。

1. 创建新项目

在创建新项目时，我们需要选择「网络应用」类型的项目模板。在「新建项目」对话框中，我们可以输入项目名称和其他相关信息。

1. 添加 TCP 服务器模块

在项目中，我们需要添加 TCP 服务器模块。我们可以在「模块管理器」中搜索「net」模块，并将其添加到我们的项目中。

1. 编写 TCP 回声服务器代码

在编写 TCP 回声服务器代码时，我们需要创建一个新文件并命名为「server.c」。在这个文件中，我们可以编写如下的代码：

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