使用C++实现socket连接

下面是一个简单的使用C++实现socket连接的示例代码，其中实现了客户端和服务器端之间的基本通信。

服务器端代码：

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

using namespace std;

int main() {
    // 创建socket
    int server_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket == -1) {
        cerr << "创建socket失败" << endl;
        return -1;
    }
    cout << "socket创建成功" << endl;

    // 绑定IP地址和端口号
    struct sockaddr_in server_addr{};
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(12345);
    if (bind(server_socket, (struct sockaddr *) &server_addr, sizeof(server_addr)) == -1) {
        cerr << "绑定IP地址和端口号失败" << endl;
        close(server_socket);
        return -1;
    }
    cout << "绑定IP地址和端口号成功" << endl;

    // 监听连接请求
    if (listen(server_socket, 10) == -1) {
        cerr << "监听连接请求失败" << endl;
        close(server_socket);
        return -1;
    }
    cout << "等待客户端连接..." << endl;

    // 接受连接请求
    struct sockaddr_in client_addr{};
    socklen_t client_addr_len = sizeof(client_addr);
    int client_socket = accept(server_socket, (struct sockaddr *) &client_addr, &client_addr_len);
    if (client_socket == -1) {
        cerr << "接受连接请求失败" << endl;
        close(server_socket);
        return -1;
    }
    cout << "客户端连接成功" << endl;

    // 接收客户端发送的数据
    char buffer[1024];
    memset(buffer, 0, sizeof(buffer));
    if (recv(client_socket, buffer, sizeof(buffer), 0) == -1) {
        cerr << "接收数据失败" << endl;
        close(client_socket);
        close(server_socket);
        return -1;
    }
    cout << "接收到客户端发送的数据：" << buffer << endl;

    // 发送数据给客户端
    const char *msg = "Hello, I'm server.";
    if (send(client_socket, msg, strlen(msg), 0) == -1) {
        cerr << "发送数据失败" << endl;
        close(client_socket);
        close(server_socket);
        return -1;
    }
    cout << "发送数据成功" << endl;

    // 关闭socket
    close(client_socket);
    close(server_socket);

    return 0;
}

客户端代码：

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

using namespace std;

int main() {
    // 创建socket
    int client_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (client_socket == -1) {
        cerr << "创建socket失败" << endl;
        return -1;
    }
    cout << "socket创建成功" << endl;

    // 连接服务器
    struct sockaddr_in server_addr{};
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    server_addr.sin_port = htons(12345);
    if (connect(client_socket, (struct sockaddr *) &server_addr, sizeof(server_addr)) == -1) {
        cerr << "连接服务器失败" << endl;
        close(client_socket);
        return -1;
    }
    cout << "连接服务器成功" << endl;

    // 发送数据给服务器
    const char *msg = "Hello, I'm client.";
    if (send(client_socket, msg, strlen(msg), 0) == -1) {
        cerr << "发送数据失败" << endl;
        close(client_socket);
        return -1;
    }
    cout << "发送数据成功" << endl;

    // 接收服务器发送的数据
    char buffer[1024];
    memset(buffer, 0, sizeof(buffer));
    if (recv(client_socket, buffer, sizeof(buffer), 0) == -1) {
        cerr << "接收数据失败" << endl;
        close(client_socket);
        return -1;
    }
    cout << "接收到服务器发送的数据：" << buffer << endl;

    // 关闭socket
    close(client_socket);

    return 0;
}

以上代码仅供参考，具体实现需要根据具体场景进行调整。