DEVC++需要加入ws2_32库

#include <iostream>
#include <winsock2.h>

#pragma comment(lib, "ws2_32.lib")

void sendData(const char* ip, int port, const char* data) {
    WSADATA wsaData;
    SOCKET sockfd;
    struct sockaddr_in server_addr;

    // 初始化Winsock
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "WSAStartup failed" << std::endl;
        return;
    }

    // 创建socket
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == INVALID_SOCKET) {
        std::cerr << "Error creating socket" << std::endl;
        WSACleanup();
        return;
    }

    // 设置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(port);
    server_addr.sin_addr.s_addr = inet_addr(ip);

    // 连接服务器
    if (connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
        std::cerr << "Connection failed" << std::endl;
        closesocket(sockfd);
        WSACleanup();
        return;
    }

    // 发送数据
    if (send(sockfd, data, strlen(data), 0) == SOCKET_ERROR) {
        std::cerr << "Send failed" << std::endl;
    } else {
        std::cout << "Data sent successfully" << std::endl;
    }

    // 关闭socket
    closesocket(sockfd);
    WSACleanup();
}

int main() {
    const char* ip = "127.0.0.1"; // 替换为目标服务器的IP地址
    int port = 5009; // 替换为目标服务器的端口
    const char* data = "Hello, Server!";

    sendData(ip, port, data);

    return 0;
}