socket 通信 C++实现代码

以下是一个简单的 C++ Socket 通信代码示例：

服务端：

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

using namespace std;

int main(int argc, char *argv[]) {
    int server_fd, client_fd;
    struct sockaddr_in server_addr, client_addr;
    char buffer[1024] = {0};

    // 创建 socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址和端口
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(8000);

    // 绑定地址和端口
    if (bind(server_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // 开始监听客户端连接
    if (listen(server_fd, 5) == -1) {
        perror("listen failed");
        exit(EXIT_FAILURE);
    }

    socklen_t client_addr_len = sizeof(client_addr);

    // 等待客户端连接
    if ((client_fd = accept(server_fd, (struct sockaddr*)&client_addr, &client_addr_len)) == -1) {
        perror("accept failed");
        exit(EXIT_FAILURE);
    }

    // 接收客户端消息
    int valread = read(client_fd, buffer, 1024);
    cout << "Received: " << buffer << endl;

    // 发送消息给客户端
    const char* message = "Hello from server";
    send(client_fd, message, strlen(message), 0);

    return 0;
}

客户端：

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

using namespace std;

int main(int argc, char *argv[]) {
    int client_fd;
    struct sockaddr_in server_addr;
    char buffer[1024] = {0};

    // 创建 socket
    if ((client_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址和端口
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8000);

    // 转换 IP 地址
    if (inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) <= 0) {
        perror("inet_pton failed");
        exit(EXIT_FAILURE);
    }

    // 连接服务器
    if (connect(client_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) {
        perror("connect failed");
        exit(EXIT_FAILURE);
    }

    // 发送消息给服务器
    const char* message = "Hello from client";
    send(client_fd, message, strlen(message), 0);

    // 接收服务器消息
    int valread = read(client_fd, buffer, 1024);
    cout << "Received: " << buffer << endl;

    return 0;
}