Some problem using the fieldtripbuffer

[Robert Oostenveld]

Hi Teris,

I have also occasionally encountered the problem with opening a TCP connection on windows (i.e. bci2000). The error means that the client (MATLAB) is not able to make a connection to the server (the fieldtrip buffer which is running under BCI2000).

On a Linux or OSX only setup (both the matlab client and the buffer server running on linux and/or OSX) the problem never happened to me. I don't know where in the code the problem is, and since it is so difficult to reproduce, I also don't know where to start looking in the code. If it results in problems for you, then I suggest you do something like

function varargout = retry_read_header(varargin)
retry = 100;
while retry>0
  try
      varargout = read_header(varargin{:});
      break;
  end
  retry = retry - 1;
end

and something similar for read_data and read_event.

Of course it would be better if the problem were fully diagnosed and subsequently fixed, so any suggestions are welcome.

best regards,
Robert  



-----------------------------------------------------------
Robert Oostenveld, PhD
Senior Researcher
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
tel.: +31 (0)24 3619695
e-mail: r.oostenveld at donders.ru.nl
web: http://www.ru.nl/neuroimaging
skype: r.oostenveld
-----------------------------------------------------------

On 12 Jan 2010, at 8:20, teris tam wrote:

> Dear all,
>         I am trying to read the signal from BCI2000 in MATLAB using the fieldtripbuffer. I use the code given in the BCI2000 wiki at http://www.bci2000.org/wiki/index.php/Programming_Tutorial:Working_with_the_FieldTrip_buffer.
>         It was able to read and plot the signal from BCI2000 correctly for a certain period of time, but eventually it stopped and reported "ERROR: failed to create socket (-2)". I was able to connect to and read from the buffer again if I re-run the program.
>         Does anyone have an idea why this error occur and how to solve it?
>         Thanks a lot!
> Best regards,
> Teris

-----------------------------------------------------------
Robert Oostenveld, PhD
Senior Researcher
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
tel.: +31 (0)24 3619695
e-mail: r.oostenveld at donders.ru.nl
web: http://www.ru.nl/neuroimaging
skype: r.oostenveld
-----------------------------------------------------------


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