if(strcmp(Command,"exit")==0)
 {
  stMessage sendbuf;
  sendbuf.iMessageType = LOGOUT;
  strncpy(sendbuf.message.logoutmember.userName, UserName, 10);
  sockaddr_in server;
  server.sin_addr.S_un.S_addr = inet_addr(ServerIP);
  server.sin_family = AF_INET;
  server.sin_port = htons(SERVER_PORT);

  sendto(PrimaryUDP,(const char*)&sendbuf, sizeof(sendbuf), 0, (const sockaddr *)&server, sizeof(server));
  shutdown(PrimaryUDP, 2);
  closesocket(PrimaryUDP);
  exit(0);
 }
 else if(strcmp(Command,"send")==0)
 {
  char sendname[20];
  char message[COMMANDMAXC];
  int i;
  for(i=5;;i++)
  {
   if(CommandLine[i]!=' ')
    sendname[i-5]=CommandLine[i];
   else
   {
    sendname[i-5]='\0';
    break;
   }
  }
  strcpy(message, &(CommandLine[i+1]));
  if(SendMessageTo(sendname, message))
   printf("Send OK!\n");
  else
   printf("Send Failure!\n");
 }
 else if(strcmp(Command,"getu")==0)
 {
  int command = GETALLUSER;
  sockaddr_in server;
  server.sin_addr.S_un.S_addr = inet_addr(ServerIP);
  server.sin_family = AF_INET;
  server.sin_port = htons(SERVER_PORT);

  sendto(PrimaryUDP,(const char*)&command, sizeof(command), 0, (const sockaddr *)&server, sizeof(server));
 }
}

// 接受消息线程
DWORD WINAPI RecvThreadProc(LPVOID lpParameter)
{
 sockaddr_in remote;
 int sinlen = sizeof(remote);
 stP2PMessage recvbuf;
 for(;;)
 {

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