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How can I make a file be automatically closed after ending a running matlab script...

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Chris
Chris on 27 Jun 2013
Hello,
I've been working on a script that uses the VideoWriter class in order to write each frame generated to an avi file. Currently, I have to use control + C to end the script. This means that the file is not properly closed after the script ends, so if I open it in a video player I get an error due to the lock on the file. I have to manually execute a close statement on the file each time in matlab, which is tedious.
I've looked into the following possibilities:
*I tried using CloseRequestFcn to make the script end when the X button is clicked in the topright of the window. I can close the file here. Unfortunately, however, there does not appear to be a command that ends a script. "quit" exits matlab altogether, which forces me to restart matlab and wait for the IDE to reload.
*As best as I can tell keyboard handling is done with call back functions. I'm not really sure how you can tell the main script to end its loop from a callback function.
Thanks in advance.

Accepted Answer

Walter Roberson
Walter Roberson on 27 Jun 2013
Have your loop check a flag to see if it should exit. Have one of the callbacks set the flag.
while true
drawnow();
should_exit = get(handles.SOMEHANDLE, 'value');
if should_exit; break; end
.......
end
  1 Comment
Chris
Chris on 27 Jun 2013
Sorry, not sure if I should have posted my question here...It showed up as another answer below.

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More Answers (2)

Chris
Chris on 27 Jun 2013
Is get with a handle a way of passing variables across scripts/functions/files? I know how to do this kind of thing in C++/Java but am not as well versed with Matlab.
  2 Comments
Chris
Chris on 28 Jun 2013
So in order to use the code above, you would essentially associate variables with a UI object and then use get to get them?
If I'm just rendering to a window with plot and don't have any actual UI controls, would I need to do anything special to use this?

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Tom
Tom on 28 Jun 2013
What conditions do want to satisfy to make it close? Or rather, what is preventing you from using close(vidObj) ?

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