CentOS下怎样写C++网络编程

作者：袖梨 2026-06-10

在CentOS系统下进行C++网络编程，通常会使用套接字（socket）API。以下是一个简单的TCP服务器和客户端的示例，展示了如何在CentOS上进行C++网络编程。

TCP服务器

创建一个名为tcp_server.cpp的文件：

#include <iostream>#include <cstring>#include <sys/socket.h>#include <netinet/in.h>#include <unistd.h>int main() {int server_fd, new_socket;struct sockaddr_in address;int opt = 1;int addrlen = sizeof(address);char buffer[1024] = {0};// 创建套接字文件描述符if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {perror("socket failed");exit(EXIT_FAILURE);}// 设置套接字选项if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {perror("setsockopt");exit(EXIT_FAILURE);}address.sin_family = AF_INET;address.sin_addr.s_addr = INADDR_ANY;address.sin_port = htons(8080);// 绑定套接字到地址if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {perror("bind failed");exit(EXIT_FAILURE);}// 监听连接if (listen(server_fd, 3) < 0) {perror("listen");exit(EXIT_FAILURE);}// 接受连接if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {perror("accept");exit(EXIT_FAILURE);}// 读取数据read(new_socket, buffer, 1024);std::cout << "Message from client: " << buffer << std::endl;// 发送响应send(new_socket, "Hello from server", 17, 0);std::cout << "Hello message sentn";// 关闭套接字close(new_socket);close(server_fd);return 0;}

编译代码：

g++ -o tcp_server tcp_server.cpp

运行服务器：

./tcp_server

TCP客户端

创建一个名为tcp_client.cpp的文件：

#include <iostream>#include <sys/socket.h>#include <arpa/inet.h>#include <unistd.h>#include <string.h>int main() {int sock = 0;struct sockaddr_in serv_addr;char buffer[1024] = {0};// 创建套接字文件描述符if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {std::cout << "n Socket creation error n";return -1;}serv_addr.sin_family = AF_INET;serv_addr.sin_port = htons(8080);// 将IPv4地址从文本转换为二进制形式if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {std::cout << "nInvalid address/ Address not supported n";return -1;}// 连接到服务器if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {std::cout << "nConnection Failed n";return -1;}// 发送数据send(sock, "Hello from client", 17, 0);std::cout << "Hello message sentn";// 读取响应read(sock, buffer, 1024);std::cout << "Message from server: " << buffer << std::endl;// 关闭套接字close(sock);return 0;}