windowsC++创建一个server端的类，ip为127.0.0.1，端口7799。这个server端用于接收client的信息

在Windows环境下使用C++创建一个服务器，通常我们会利用Socket编程技术。下面是一个简单的例子，展示如何创建一个Server类，监听IP地址127.0.0.1和端口号7799：

#include <iostream>
#include <winsock2.h>
#include <ws2tcpip.h>

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

class Server {
private:
    struct addrinfo hints;
    SOCKET server_socket;
    char buffer[256];

public:
    Server(int port)
        : hints(ai_family = AF_INET, ai_socktype = SOCK_STREAM, ai_flags = AI_PASSIVE),
          server_socket(INVALID_SOCKET) {
        ZeroMemory(&hints, sizeof(hints));
        // 获取本地回环地址
        hints.ai_addr = reinterpret_cast<struct sockaddr_in*>(&hints.sin6_addr);
        hints.ai_addrlen = sizeof(struct sockaddr_in);

        // 创建套接字
        if (WSAStartup(MAKEWORD(2, 2), &wsaData)) {
            std::cerr << "WSAStartup failed" << std::endl;
            return;
        }

        server_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
        if (server_socket == INVALID_SOCKET) {
            std::cerr << "Socket creation failed" << std::endl;
            WSACleanup();
            return;
        }

        // 绑定服务器到指定端口
        if (bind(server_socket, (struct sockaddr*)&hints, sizeof(hints)) != 0) {
            std::cerr << "Bind failed: " << WSAGetLastError() << std::endl;
            closesocket(server_socket);
            WSACleanup();
            return;
        }

        // 开始监听连接
        if (listen(server_socket, SOMAXCONN) != 0) {
            std::cerr << "Listen failed: " << WSAGetLastError() << std::endl;
            closesocket(server_socket);
            WSACleanup();
            return;
        }

        std::cout << "Server started on 127.0.0.1:7799" << std::endl;

        // 接收客户端连接并处理请求
        accept_client();
    }

    ~Server() {
        if (server_socket != INVALID_SOCKET) {
            closesocket(server_socket);
        }
        WSACleanup();
    }

private:
    void accept_client() {
        while (true) {
            SOCKET client_socket = accept(server_socket, nullptr, nullptr);
            if (client_socket == INVALID_SOCKET) break;

            std::string message;
            do {
                recv(client_socket, buffer, sizeof(buffer), 0);
                message += buffer;
            } while (recv(client_socket, buffer, sizeof(buffer), MSG_PEEK) > 0);

            std::cout << "Received from client: " << message << std::endl; // 这里只是打印信息，实际可以解析消息并处理

            send(client_socket, "Server received your message", strlen("Server received your message"), 0);
            closesocket(client_socket);
        }
    }
};

int main() {
    try {
        Server server(7799);
        server_thread.join();
    } catch (...) {
        std::cerr << "An error occurred." << std::endl;
    }
    return 0;
}

在这个示例中，`Server` 类初始化了一个TCP服务器，等待来自127.0.0.1的连接。当有客户端连接时，它接受数据、读取数据，并向客户端发送一条确认消息。