C++怎么实现TCP网络通信_C++中使用Socket套接字进行网络编程入门

#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

int main() {
    int server_fd, client_fd;
    struct sockaddr_in address;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};

    // 创建套接字
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        return -1;
    }

    // 配置地址结构
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(8080);

    // 绑定
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        return -1;
    }

    // 监听
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        return -1;
    }

    std::cout << "Server listening on port 8080...\n";

    // 接受连接
    if ((client_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
        perror("accept");
        return -1;
    }

    // 接收数据
    int valread = read(client_fd, buffer, 1024);
    std::cout << "Client: " << buffer << std::endl;

    // 发送响应
    const char *response = "Hello from server";
    send(client_fd, response, strlen(response), 0);

    close(client_fd);
    close(server_fd);
    return 0;
}

#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>

int main() {
    int sock = 0;
    struct sockaddr_in serv_addr;
    char buffer[1024] = {0};
    const char *message = "Hello from client";

    // 创建套接字
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket creation error");
        return -1;
    }

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(8080);

    // 将IP地址转换为二进制格式
    if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
        perror("invalid address");
        return -1;
    }

    // 连接服务器
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("connection failed");
        return -1;
    }

    // 发送数据
    send(sock, message, strlen(message), 0);
    std::cout << "Message sent\n";

    // 接收响应
    int valread = read(sock, buffer, 1024);
    std::cout << "Server response: " << buffer << std::endl;

    close(sock);
    return 0;
}

g++ server.cpp -o server
g++ client.cpp -o client

./server

./client