Working with ZMQ in MATLAB for communicating with eye tracker device

I have to install and work with these two packages:

https://github.com/fagg/matlab-zmq

https://github.com/bastibe/matlab-msgpack

My system information:

Windows 10 Pro

MATLAB R2020b

ZMQ libzmq-v141-mt-4_3_2

make.m ran successfully, as shown here:

...
... 
...
Building with 'MinGW64 Compiler (C)'.
MEX completed successfully.

Succesful build for:
	ZMQ_INCLUDE_PATH = C:\...\libzmq
	ZMQ_LIB_PATH = C:\...\libzmq
	ZMQ_COMPILED_LIB = libzmq-v141-mt-4_3_2.lib


ans =

  logical

   1

but the script where I try to communicate with my device still gives an error.

Here's the script:

% pupil_remote_control.m

% (*)~----------------------------------------------------------------------------------
%  Pupil Helpers
%  Copyright (C) 2012-2016  Pupil Labs
% 
%  Distributed under the terms of the GNU Lesser General Public License (LGPL v3.0).
%  License details are in the file license.txt, distributed as part of this software.
% ----------------------------------------------------------------------------------~(*)
% Pupil Remote address
endpoint =  'tcp://127.0.0.1:50020';
% Setup zmq context and remote helper
ctx = zmq.core.ctx_new();
socket = zmq.core.socket(ctx, 'ZMQ_REQ');
% set timeout to 1000ms in order to not get stuck in a blocking
% mex-call if server is not reachable, see
% http://api.zeromq.org/4-0:zmq-setsockopt#toc19
zmq.core.setsockopt(socket, 'ZMQ_RCVTIMEO', 1000);
fprintf('Connecting to %s\n', endpoint);
zmq.core.connect(socket, endpoint);
tic; % Measure round trip delay
zmq.core.send(socket, uint8('t'));
result = zmq.core.recv(socket);
fprintf('%s\n', char(result));
fprintf('Round trip command delay: %s\n', toc);
% set current Pupil time to 0.0
zmq.core.send(socket, uint8('T 0.0'));
result = zmq.core.recv(socket);
fprintf('%s\n', char(result));
% start recording
pause(1.0);
zmq.core.send(socket, uint8('R'));
result = zmq.core.recv(socket);
fprintf('Recording should start: %s\n', char(result));
pause(5.0);
zmq.core.send(socket, uint8('r'));
result = zmq.core.recv(socket);
fprintf('Recording stopped: %s\n', char(result));
% test notification, note that you need to listen on the IPC to receive notifications!
send_notification(socket, containers.Map({'subject'}, {'calibration.should_start'}))
result = zmq.core.recv(socket);
fprintf('Notification received: %s\n', char(result));
send_notification(socket, containers.Map({'subject'}, {'calibration.should_stop'}))
result = zmq.core.recv(socket);
fprintf('Notification received: %s\n', char(result));
zmq.core.disconnect(socket, endpoint);
zmq.core.close(socket);
zmq.core.ctx_shutdown(ctx);
zmq.core.ctx_term(ctx);

and the error is:

Error using zmq.core.ctx_new
Invalid MEX-file 'C:\...\matlab-zmq-master\lib\+zmq\+core\ctx_new.mexw64': The specified module could not be found.

Error in practice_run (line 23)
ctx = zmq.core.ctx_new();

while the module exists exactly where it's looking for it.

List of all the relevant softwars I have is attached.

[Rick Howard]

It has been awhile, but I was curious if you were able to solve this?

Also, are you sure that the libzmq.dll file is also in the same folder as your MEX file?

Regards,

Rick

[zhou panfeng]

thanks