My question is, how do I stop a script by a pressing a GUI button? I already tried to write a code that simulates "CTRL+C" press, but it doesn't work.
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Sorry -- why don't you just hit Ctrl-C? Why are you trying to simulate it?aardvarkk– aardvarkk2012-02-02 18:25:31 +00:00Commented Feb 2, 2012 at 18:25
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i just want a user to be able to stop the script that he started by pressing a button on a IDE. Woudl be nice to have a Cancel button.Daniele Kerberos– Daniele Kerberos2012-02-02 18:41:08 +00:00Commented Feb 2, 2012 at 18:41
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I've adjust my answer accordingly.aardvarkk– aardvarkk2012-02-02 18:43:04 +00:00Commented Feb 2, 2012 at 18:43
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4 Answers
I'm not sure there's a way to stop another script from being called. One alternative would be to set a global variable that's periodically checked by the script you wish to stop. If you set the value of a "stop processing" variable to true in your callback, the other script could stop if it found that it was supposed to stop.
Edit
If you'd like to have a GUI option to stop an ongoing process, I would recommend you take a look at something like STOPLOOP on the MATLAB File Exchange.
Comments
I won't write the code for you but here's a high-level way to accomplish this:
Display a waitbar with a button on it. Create a callback function for the button which sets a flag to true.
Begin computation inside of a for-loop. In the loop:
1. update the waitbar.
2. call the drawnow function so that the callback is executed properly. Remember MATLAB is single-threaded, so this is necessary or the callback will not execute until the script finishes.
3. perform any other computation
4. check for the flag set to true. if it is true, return to stop execution.
The flag could be a global variable, or a handle-based object (so that it is passed by reference).
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EDIT:
This answer is not applicable for the current question.
This answer is applicable only for scripts having the first line = #!/usr/bin/matlab
use pkill without option will send a TERM signal:
pkill yourscriptname
If you really want the same signal as CTRL+C then:
pkill -3 yourscriptname
If your script still does not stop, you can use the most aggressive signal KILL:
pkill -9 yourscriptname
Of course, if you known the PID (Process IDentifier), you can simply use kill:
kill yourPID
kill -3 yourPID
kill -9 yourPID
You can have more info about signals using one of these commands:
man 7 signal
kill -l
info signal
8 Comments
aardvarkk
Isn't this assuming the OP is using some Unix-based OS?
Andrey Rubshtein
That will kill Matlab, instead of stopping the script
oHo
Yep @aardvarkk you are right. When I read
CTRL+C, I thought about terminal, so Unix-based OS... Maybe I am wrong...oHo
Hi @Andrey. You may have right. I was thinking Daniele Kerberos uses matlab scripts as gnuplot scripts. Thanks for your comment, I edit my answer ;-)
aardvarkk
@oHessling Don't worry about it! We're all just trying to help.
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I don't do a lot of GUIs, but for debugging purposes I would try to set the button callback to @keyboard. That is, something like:
set(handleToGuiButton,'Callback',@keyboard)
To actually stop execution you would need to somehow communicate this button press into the loop that was executing, for example via global variables, or something fancier (e.g. https://stackoverflow.com/a/8537460/931379)
But I would honestly look at the stoploop link (from another answer) before going down any of these routes.
