win32 Socket服务端封装类

下面是一个使用WinSock库封装的简单Win32 Socket服务端类的示例：

#include <iostream>
#include <string>
#include <WinSock2.h>

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

class SocketServer {
public:
    SocketServer(int port) : serverPort(port), serverSocket(INVALID_SOCKET) {
        if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
            std::cerr << "Failed to initialize WinSock" << std::endl;
            throw;
        }
        
        serverSocket = socket(AF_INET, SOCK_STREAM, 0);
        if (serverSocket == INVALID_SOCKET) {
            std::cerr << "Failed to create socket" << std::endl;
            WSACleanup();
            throw;
        }
        
        serverAddr.sin_family = AF_INET;
        serverAddr.sin_addr.s_addr = INADDR_ANY;
        serverAddr.sin_port = htons(serverPort);
        
        if (bind(serverSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
            std::cerr << "Bind failed with error" << WSAGetLastError() << std::endl;
            closesocket(serverSocket);
            WSACleanup();
            throw;
        }
        
        if (listen(serverSocket, SOMAXCONN) == SOCKET_ERROR) {
            std::cerr << "Listen failed with error" << WSAGetLastError() << std::endl;
            closesocket(serverSocket);
            WSACleanup();
            throw;
        }
    }
    
    ~SocketServer() {
        closesocket(serverSocket);
        WSACleanup();
    }
    
    void startListening() {
        struct sockaddr_in clientAddr;
        int clientAddrLen = sizeof(clientAddr);
        
        while (true) {
            SOCKET clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddr, &clientAddrLen);
            if (clientSocket == INVALID_SOCKET) {
                std::cerr << "Accept failed with error" << WSAGetLastError() << std::endl;
                closesocket(serverSocket);
                WSACleanup();
                return;
            }
            
            std::cout << "Client connected" << std::endl;
            
            // 处理客户端请求
            std::string response = "Hello, client!";
            send(clientSocket, response.c_str(), response.length(), 0);
            
            // 关闭客户端连接
            closesocket(clientSocket);
            std::cout << "Client disconnected" << std::endl;
        }
    }
    
private:
    int serverPort;
    WSADATA wsaData;
    SOCKET serverSocket;
    SOCKADDR_IN serverAddr;
};

int main() {
    SocketServer server(8080);
    server.startListening();
    
    return 0;
}

这个示例演示了一个简单的Win32 Socket服务端类。它在构造函数中初始化WinSock库，创建套接字并绑定到指定的端口。然后，在`startListening`方法中，它会接受客户端连接，处理客户端请求，并发送响应。每个客户端连接完成后，套接字会被关闭。你可以根据需要扩展该类以满足特定的需求。