c++怎么进行socket网络编程_c++ socket网络通信实现示例

#include <iostream>
#include <cstring>

#ifdef _WIN32
    #include <winsock2.h>
    #pragma comment(lib, "ws2_32.lib")
#else
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <unistd.h>
#endif

int main() {
#ifdef _WIN32
    WSADATA wsa;
    WSAStartup(MAKEWORD(2,2), &wsa);
#endif

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

    // 创建socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        std::cerr << "Socket failed\n";
        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) {
        std::cerr << "Bind failed\n";
        return -1;
    }

    // 监听
    if (listen(server_fd, 3) < 0) {
        std::cerr << "Listen failed\n";
        return -1;
    }
    std::cout << "Server listening on port 8080...\n";

    // 接受连接
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
        std::cerr << "Accept failed\n";
        return -1;
    }

    // 读取数据
    read(new_socket, buffer, 1024);
    std::cout << "Client: " << buffer << "\n";

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

#ifdef _WIN32
    closesocket(new_socket);
    closesocket(server_fd);
    WSACleanup();
#else
    close(new_socket);
    close(server_fd);
#endif

    return 0;
}

#include <iostream>
#include <cstring>

#ifdef _WIN32
    #include <winsock2.h>
    #pragma comment(lib, "ws2_32.lib")
#else
    #include <sys/socket.h>
    #include <arpa/inet.h>
    #include <unistd.h>
#endif

int main() {
#ifdef _WIN32
    WSADATA wsa;
    WSAStartup(MAKEWORD(2,2), &wsa);
#endif

    int sock = 0;
    struct sockaddr_in serv_addr;
    char *hello = "Hello from client";
    char buffer[1024] = {0};

    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        std::cerr << "Socket creation error\n";
        return -1;
    }

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

    // 将IP地址从文本转换为二进制
    if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
        std::cerr << "Invalid address / Address not supported\n";
        return -1;
    }

    // 连接服务器
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        std::cerr << "Connection Failed\n";
        return -1;
    }

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

    // 接收回复
    read(sock, buffer, 1024);
    std::cout << "Server response: " << buffer << "\n";

#ifdef _WIN32
    closesocket(sock);
    WSACleanup();
#else
    close(sock);
#endif

    return 0;
}