visiostudio udp接收数据 C++ 客户端代码

在Visual Studio中创建一个C++客户端，用于通过UDP协议接收数据，你可以按照以下步骤编写代码：

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

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

// UDP服务器地址和端口
const char* serverAddress = "your_server_ip";
const unsigned short serverPort = 12345;

class UdpClient {
public:
    UdpClient() {
        // 初始化Winsock
        WSADATA wsaData;
        if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
            std::cerr << "Failed to initialize Winsock!" << std::endl;
            return;
        }

        socket_ = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        if (socket_ == INVALID_SOCKET) {
            std::cerr << "Failed to create socket!" << std::endl;
            WSACleanup();
            return;
        }

        addr.sin_family = AF_INET;
        addr.sin_port = htons(serverPort);
        addr.sin_addr.S_un.S_addr = inet_addr(serverAddress);

        // 设置发送和接收缓冲区大小
        int opt = 1; // SO_BROADCAST for broadcast packets
        setsockopt(socket_, SOL_SOCKET, SO_BROADCAST, (char*)&opt, sizeof(opt));
        int bufsize = 1024;
        setsockopt(socket_, SOL_SOCKET, SO_RCVBUF, (char*)&bufsize, sizeof(bufsize));
    }

    ~UdpClient() {
        closesocket(socket_);
        WSACleanup();
    }

    void startReceiving() {
        char buffer[1024];
        while (true) {
            const int bytes_received = recvfrom(socket_, buffer, sizeof(buffer), 0, &remoteAddr, nullptr);
            if (bytes_received > 0) {
                std::cout << "Received data from " << inet_ntoa(remoteAddr.sin_addr) << ":" << ntohs(remoteAddr.sin_port)
                          << ": " << buffer << std::endl;
            } else if (bytes_received == 0) {
                std::cout << "Connection closed by the server." << std::endl;
                break;
            } else {
                std::cerr << "Error receiving data: " << WSAGetLastError() << std::endl;
            }
        }
    }

private:
    SOCKET socket_;
    sockaddr_in addr, remoteAddr;
};

int main() {
    UdpClient client;
    try {
        client.startReceiving();
    } catch (std::exception& e) {
        std::cerr << "Exception caught: " << e.what() << std::endl;
    }
    return 0;
}