int error = -1;
int len = sizeof(int);
timeval tm;
fd_set set;
unsigned long ul = 1;
ioctlsocket(Socket, FIONBIO, &ul);  // set as non-blocking
bool ret = false;
if (connect(Socket, (struct sockaddr *)&ServerAddress,
      sizeof(ServerAddress)) == -1) {
  tm.tv_sec = 10;  // set the timeout. 10s
  tm.tv_usec = 0;
  FD_ZERO(&set);
  FD_SET(Socket, &set);

  if (select(Socket + 1, NULL, &set, NULL, &tm) > 0) {
    getsockopt(Socket, SOL_SOCKET, SO_ERROR, (char *)&error,
           /*(socklen_t *)*/ &len);
    if (error == 0)
      ret = true;
    else
      ret = false;
  } else
    ret = false;
} else
  ret = true;

ul = 0;
ioctlsocket(Socket, FIONBIO, &ul);  // set as blocking
if (!ret) {
  closesocket(Socket);
  fprintf(stderr, "Cannot Connect the server!/n");
}