端口号写的是 2345

客户端

#include <iostream>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")using std::cout;
using std::endl;
using std::cin;int main()
{WSADATA wsa;if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0){cout << "startup error" << endl;}sockaddr_in sd;sd.sin_port = htons(2345);sd.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");sd.sin_family = AF_INET;SOCKET sock = socket(PF_INET, SOCK_DGRAM, 0);// connect(sock, (sockaddr *)&sd, sizeof(sd));for (int i = 0; i < 10; ++i){char buf[1024];cout << "请输入文本:" << endl;cin >> buf;int len = sizeof(sd);sendto(sock, buf, strlen(buf), 0, (sockaddr *)&sd, sizeof(sd));len = sizeof(sd);memset(&buf, 0, 1024);recvfrom(sock, buf, 1024, 0,(sockaddr *)&sd, &len);cout << "收到的数据:" << buf<<endl;}getchar();closesocket(sock);WSACleanup();return 0;
}

服务端

#include <iostream>
#include <WinSock2.h>#pragma comment(lib, "ws2_32.lib")using std::cout;
using std::endl;
using std::cin;int main()
{WSADATA wsa;if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0){cout << "WSA Error" << endl;return 0;}sockaddr_in sd;sd.sin_family = AF_INET;sd.sin_port = htons(2345);sd.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");SOCKET sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);if (sock == INVALID_SOCKET){cout << "socket error" << endl;return 0;}if (bind(sock, (sockaddr *)&sd, sizeof(sd)) == SOCKET_ERROR){cout << "bind error" << endl;return 0;}sockaddr_in clientSd;for (int i = 0; i < 10; ++i){char buf[1024] = "";int len = sizeof(clientSd);recvfrom(sock, buf, 1024, 0, (sockaddr *)&clientSd, &len);cout << buf<<endl;memset(&buf, 0, 1024);cout << "请输入数据:" << endl;cin >> buf;sendto(sock, buf, strlen(buf), 0, (sockaddr *)(&clientSd),sizeof(clientSd));}closesocket(sock);WSACleanup();return 0;
}