c++ socket通信代码示例

当然，我可以给你提供一个简单的C++ Socket通信代码示例。以下是一个基于TCP协议的客户端和服务器端的示例代码：

服务器端代码：

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

int main() {
    // 创建socket
    int serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == -1) {
        std::cerr << "Failed to create socket." << std::endl;
        return -1;
    }

    // 准备地址信息
    sockaddr_in serverAddress{};
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = INADDR_ANY;
    serverAddress.sin_port = htons(8888);

    // 绑定socket到指定地址和端口
    if (bind(serverSocket, (struct sockaddr *)&serverAddress, sizeof(serverAddress)) < 0) {
        std::cerr << "Failed to bind socket." << std::endl;
        return -1;
    }

    // 监听连接请求
    if (listen(serverSocket, 3) < 0) {
        std::cerr << "Failed to listen." << std::endl;
        return -1;
    }

    std::cout << "Waiting for incoming connections..." << std::endl;

    // 接受连接请求
    int clientSocket;
    sockaddr_in clientAddress{};
    socklen_t clientAddressLength = sizeof(clientAddress);
    clientSocket = accept(serverSocket, (struct sockaddr *)&clientAddress, &clientAddressLength);
    if (clientSocket < 0) {
        std::cerr << "Failed to accept connection." << std::endl;
        return -1;
    }

    std::cout << "Client connected." << std::endl;

    // 接收和发送数据
    char buffer[1024] = {0};
    std::string message = "Hello from server!";
    send(clientSocket, message.c_str(), message.length(), 0);
    std::cout << "Message sent to client: " << message << std::endl;

    int bytesRead = read(clientSocket, buffer, 1024);
    if (bytesRead > 0) {
        std::cout << "Message received from client: " << buffer << std::endl;
    }

    // 关闭socket
    close(clientSocket);
    close(serverSocket);

    return 0;
}

客户端代码：

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

int main() {
    // 创建socket
    int clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == -1) {
        std::cerr << "Failed to create socket." << std::endl;
        return -1;
    }

    // 准备服务器地址信息
    sockaddr_in serverAddress{};
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_port = htons(8888);

    // 将IP地址从字符串转换为网络字节序
    if (inet_pton(AF_INET, "127.0.0.1", &(serverAddress.sin_addr)) <= 0) {
        std::cerr << "Invalid address/ Address not supported." << std::endl;
        return -1;
    }

    // 连接到服务器
    if (connect(clientSocket, (struct sockaddr *)&serverAddress, sizeof(serverAddress)) < 0) {
        std::cerr << "Connection failed." << std::endl;
        return -1;
    }

    // 接收和发送数据
    char buffer[1024] = {0};
    int bytesRead = read(clientSocket, buffer, 1024);
    if (bytesRead > 0) {
        std::cout << "Message received from server: " << buffer << std::endl;
    }

    std::string message = "Hello from client!";
    send(clientSocket, message.c_str(), message.length(), 0);
    std::cout << "Message sent to server: " << message << std::endl;

    // 关闭socket
    close(clientSocket);

    return 0;
}

这个示例展示了一个简单的客户端和服务器端的通信过程。服务器端首先创建一个socket，然后绑定到指定的地址和端口，并开始监听连接请求。当有客户端连接时，服务器端接受连接请求，并发送一条消息给客户端。客户端连接到服务器，并接收服务器发送的消息后，发送一条消息给服务器。最后，两端关闭socket。