c++怎么实现一个简单的socket客户端_socket客户端实现教程

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

#ifdef _WIN32
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
    std::cerr << "Failed to initialize Winsock!" << std::endl;
    return -1;
}
#endif

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

sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(8080);                    // 服务器端口
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");  // 服务器IP

if (connect(clientSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == -1) {
    std::cerr << "Connection failed!" << std::endl;
    return -1;
}

std::cout << "Connected to server." << std::endl;

// 发送数据
const char* message = "Hello, Server!";
send(clientSocket, message, strlen(message), 0);

// 接收响应
char buffer[1024] = {0};
int bytesRead = recv(clientSocket, buffer, sizeof(buffer) - 1, 0);
if (bytesRead > 0) {
    std::cout << "Received: " << buffer << std::endl;
} else {
    std::cout << "No data received or connection closed." << std::endl;
}

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