how to interrupt a while loop??

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IPSAS
IPSAS 2012-6-6
评论： Danilo Teran 2017-5-10
in GUI, I try to interrupt a while loop...let's say.. a program initiate while loop when button A are pushed, and i want to stop/interupt the loop by pushing button B.. any idea????

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采纳的回答

Walter Roberson
Walter Roberson 2012-6-6
You cannot do that.
The closest you can get is to have button B set a variable in a place that the code in button A can reach, with that code checking the value periodically. For example,
Button B:
set(handles.buttonA, 'UserData', 'stop');
Button A:
set(handles.buttonA, 'Userdata', []);
while ....
curval = get(handles.buttonA, 'UserData');
if ~isempty(curval) && strcmp(curval, 'stop')
break;
end
....
end
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Image Analyst
Image Analyst 2013-4-13
Walter might want to add this to the FAQ. It's useful and asked fairly often, but I don't think it's on there yet. By the way, you can also do it with a checkbox. Button A makes the "Finish Now" checkbox become visible and clears it. When the user checks the box, the loop will "break" because it gets the checkbox value and checks to see if it's checked.
Danilo Teran
Danilo Teran 2017-5-10
Hi I did your suggestion, but I can never stop routine on Pushbutton A. Shall I do something extra in PushburronB

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更多回答（1 个）

Geoff
Geoff 2012-6-6
In your GUI, set some user data to your GUI handle.
In your loop, check this data and break accordingly.

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