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Can't shut down COM automation server instances of MATLAB

Asked by David on 19 Nov 2012

Hi,

I'm starting some automation server instances of ML:

for ix = 1:4
    servH(ix) = actxserver('Matlab.Application.Single');
    servH(ix).Visible = 0;
    % More code...
end

I do some stuff in each session, controlling each session with some PutWorkspaceData(), GetWorkspaceData(), and Execute() methods, and when I'm done, I tried to kill these instances in a couple of different ways, e.g.:

arrayfun(@(x)x.Quit,servH);

or

for ix = 1:4
    servH(ix).Quit;
end

The above seem to work when I attempt them from the command window (launching and killing from command window), but I can't seem to kill them from within my real program. The only thing that I could reliably use was (yes, it's ugly):

try
    servH(ix).Execute('exit');
catch me
    % Killed server, and we get Error: RPC-server is unavailable
end

Am I missing something obvious here?

64-bit R2011b on Win7 by the way...

0 Comments

David

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1 Answer

Answer by Kaustubha Govind on 19 Nov 2012

Does servH(ix).Quit pass for ix=1 and fail thereafter? If yes, I wonder if you're calling the Quit method in a loop too quickly. You could try putting in a PAUSE command and see if that helps.

2 Comments

David on 20 Nov 2012

Hi Kaustubha,

Thanks for the reply.

The answer would be yes. But the actual behaviour I see is just silent acceptance in MATLAB, with no errors or warnings. I did actually try putting pause, but sadly, it didn't change anything. In fact, I tried halting the execution inside the loop and step through it, and it still wouldn't quit.

I just did some additional tests, and when I test with a barebones sample (basically just start up the servers, and immediately invoke Quit), it seems to work. What I haven't fully understood yet is why my real code would be any different, as all I do is run a few Execute commands, and PutWorkspaceData and GetWorkspaceData... Even after completion of the function, I can access the servers from the command window with h = actxGetRunningServer('matlab.application'). h.Quit from here does not work either.

Kaustubha Govind on 26 Nov 2012

David: I don't have enough expertise in this area to make further suggestions. Could you please contact MathWorks Tech Support to see if they might be able to guide you better? Thanks!

Kaustubha Govind

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