socket udp

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//Server 端程序源代码: #include <stdio.h> #include <Winsock2.h>#pragma comment (lib, "ws2_32")  #include <thread>  struct sockaddr_in from; int fromlen =sizeof(from); void recvFunction(SOCKET& sockClient)  {  while (true)  {  char buffer[1024]="\0"; printf("waiting for message from others-------------\n"); if (recvfrom(sockClient,buffer,sizeof(buffer),0,(struct sockaddr*)&from,&fromlen)!=SOCKET_ERROR) { printf("Received datagram from %s--%s\n",inet_ntoa(from.sin_addr),buffer); ////给cilent发信息 sendto(sockClient,buffer,sizeof(buffer),0,(struct sockaddr*)&from,fromlen); } }  }void sendFuction(SOCKET &sockConn)  {  while (true)  {  }  } void main() { SOCKET socket1; //InitWinsock(); WSADATA wsaData; int iErrorCode; if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL { printf("Winsock无法初始化!\n"); WSACleanup(); return; } printf("服务器开始创建SOCKET。\n"); struct sockaddr_in local; local.sin_family=AF_INET; local.sin_port=htons(27015); ///监听端口 local.sin_addr.s_addr=INADDR_ANY; ///本机 socket1=socket(AF_INET,SOCK_DGRAM,0); bind(socket1,(struct sockaddr*)&local,sizeof(local)); std::thread recvThread(recvFunction,socket1);  recvThread.detach();  std::thread sendThread(sendFuction,socket1);  sendThread.detach(); while (1) { } closesocket(socket1);WSACleanup();    }

//Client端源代码: #include <stdio.h> #include <Winsock2.h> #pragma comment (lib, "ws2_32")  #include <thread>  struct sockaddr_in server;int len =sizeof(server); void recvFunction(SOCKET& sockClient)  {  while (true)  {  char recvBuf[50];  if(recvfrom(sockClient,recvBuf,50,0,(struct sockaddr*)&server,&len) != SOCKET_ERROR){printf("rece from server:%s\n",recvBuf); }}  }void sendFuction(SOCKET &sockConn)  {  while (true)  {  char buffer[1024]="\0"; printf("input message\n"); scanf("%s",buffer); //     printf("%s",buffer); if (strcmp(buffer,"bye")==0) { printf("退出!\n"); Sleep(100); closesocket(sockConn); break; } if (sendto(sockConn,buffer,sizeof(buffer),0,(struct sockaddr*)&server,len)!=SOCKET_ERROR) { } }  } void main() { SOCKET socket1; //InitWinsock(); WSADATA wsaData; int iErrorCode; if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL { printf("Winsock无法初始化!\n"); WSACleanup(); return; } printf("服务器开始创建SOCKET。\n");  server.sin_family=AF_INET; server.sin_port=htons(27015); ///server的监听端口 server.sin_addr.s_addr=inet_addr("192.168.0.148"); ///server的地址 socket1=socket(AF_INET,SOCK_DGRAM,0); //多线程  std::thread recvThread(recvFunction,socket1);  recvThread.detach();  std::thread sendThread(sendFuction,socket1);  sendThread.detach();  while (1) { } closesocket(socket1);WSACleanup();   }

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