windows下网络编程UDP
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C++ UDP客户端服务器Socket编程
UDPServer.cpp
#include<winsock2.h> #include<stdio.h> #include<string.h> #include<iostream> using namespace std; #pragma comment(lib,"ws2_32.lib") #define BUFFER_SIZE 1024 int main() { WSADATA WSAData; char receBuf[BUFFER_SIZE]; char Response[] = ""; if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0) { printf("初始化失败"); exit(1); } SOCKET sockServer = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (sockServer == INVALID_SOCKET) { printf("Failed socket() \n"); return 0; } SOCKADDR_IN addr_Server; //服务器的地址等信息 addr_Server.sin_family = AF_INET; addr_Server.sin_port = htons(4567); addr_Server.sin_addr.S_un.S_addr = INADDR_ANY; if (bind(sockServer, (SOCKADDR*)&addr_Server, sizeof(addr_Server)) == SOCKET_ERROR) { //服务器与本地地址绑定 printf("Failed socket() %d \n", WSAGetLastError()); return 0; } SOCKADDR_IN addr_Clt; int fromlen = sizeof(SOCKADDR); while (true) { int last = recvfrom(sockServer, receBuf, 1024, 0, (SOCKADDR*)&addr_Clt, &fromlen); if (last>0) { //判断接收到的数据是否为空 receBuf[last] = '\0';//给字符数组加一个'\0',表示结束了。不然输出有乱码 if (strcmp(receBuf, "bye") == 0) { cout << " 客户端不跟我聊天了..." << endl; closesocket(sockServer); return 0; } else { printf("接收到数据(%s):%s\n", inet_ntoa(addr_Clt.sin_addr), receBuf); } } cout << "回复客户端消息:"; cin >> Response; //给客户端回复消息 sendto(sockServer, Response, strlen(Response), 0, (SOCKADDR*)&addr_Clt, sizeof(SOCKADDR)); } closesocket(sockServer); WSACleanup(); return 0; }
UDPClient.cpp
#include<winsock2.h> #include<stdio.h> #include<string.h> #include<iostream> using namespace std; #pragma comment(lib,"ws2_32.lib") # define BUFFER_SIZE 1024 //缓冲区大小 int main() { SOCKET sock_Client; //客户端用于通信的Socket WSADATA WSAData; char receBuf[BUFFER_SIZE]; //发送数据的缓冲区 char sendBuf[BUFFER_SIZE]; //接受数据的缓冲区 if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0) { printf("初始化失败!"); return -1; } //初始化 sock_Client = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);//创建客户端用于通信的Socket SOCKADDR_IN addr_server; //服务器的地址数据结构 addr_server.sin_family = AF_INET; addr_server.sin_port = htons(4567);//端口号为4567 addr_server.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); //127.0.0.1为本电脑IP地址 SOCKADDR_IN sock; int len = sizeof(sock); while (true) { cout << "请输入要传送的数据:"; cin >> sendBuf; sendto(sock_Client, sendBuf, strlen(sendBuf), 0, (SOCKADDR*)&addr_server, sizeof(SOCKADDR)); //int last=recv(sock_Client, receBuf, strlen(receBuf), 0); // (调用recv和recvfrom都可以) int last = recvfrom(sock_Client, receBuf, strlen(receBuf), 0, (SOCKADDR*)&sock, &len); if (last>0) { receBuf[last] = '\0'; //给字符数组加一个'\0',表示结束了。不然输出有乱码 if (strcmp(receBuf, "bye") == 0) { cout << "服务器不跟我聊天了..." << endl;//当服务器发来bye时,关闭socket closesocket(sock_Client); break; } else { printf("接收到数据:%s\n", receBuf); } } } closesocket(sock_Client); WSACleanup(); return 0; }
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