Matlab socket is not interruptible?
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Yu-Chih Tung
am 29 Mär. 2017
Kommentiert: Yu-Chih Tung
am 11 Apr. 2017
Hi,
I am developing a Matlab UI/Socket program where users can click a button to start and read a tcp socket. It is obviously that such a design need the tcp socket not block the UI thread. I mainly reference a Matlab UI interruption guideline http://www.mathworks.com/help/matlab/creating_guis/callback-sequencing-and-interruption.html to build my program. Setting the 'Interruptible' flag to 'on' does achieve my expected behavior.
However, when I add the socket code into this "interruptible" callback, everything stop working. Here is the example code:
function create_update_waitbar
h_wait = waitbar(0,'Please wait...',...
'Position',[250,320,270,50],...
'CloseRequestFcn',@close_waitbar);
port = 50005;
socket=tcpip('0.0.0.0', port, 'NetworkRole', 'server', 'Timeout', 60*60*24);
fprintf(2, '=== start wait connection to port = %d ===\n', port);
fopen(socket);
fprintf(2, '=== succeesfully get a connection to port = %d ===\n', port);
for i=1:10000,
if ishandle(h_wait)
action=fread(socket, 1, 'int8')
waitbar(i/10000,h_wait)
tic
fprintf('\nwait: %.1f: ', (i/10000)*100);
toc
else
break
end
end
% When waitbar reaches max, close it.
if ishandle(h_wait)
close(h_wait)
end
end
I basically just add a socket listening in the begin of the original callback function from the Matlab sample code and add a fread of that socket inside the waiting bar updating loop.
I expect the program can still let me use the UI (e.g., click the button to draw a figure as shown in the Matlab interruptible UI guideline), but it doesn't. This code will hang forever on the socket listening and socket read operations.
Any suggestion of achieving the goal of UI to control a Matlab socket?
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Akzeptierte Antwort
Prannay Jain
am 11 Apr. 2017
Currently in MATLAB, when you try to open a connection (either as the 'server' or the 'client') using a 'tcpip' object, the call blocks MATLAB execution until either the connection is made or the call times out. In short, MATLAB tcpip socket is not interruptible.
I work for MathWorks and have provided this feedback to the developers.
Weitere Antworten (2)
Prannay Jain
am 6 Apr. 2017
'tcpip' is not a base MATLAB function. It comes with Instrument Control Toolbox. Can you try with 'tcpclient' which comes with base MATLAB to create tcp/ip socket?
Prannay Jain
am 7 Apr. 2017
You have mentioned that setting the 'Interruptible' flag to 'on' does achieve your expected behavior. Then what is the part that you are not getting? Can you explain more on this?
I also want to confirm if you have Instrument Contol Toolbox license with your MATLAB.
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