how to interrupt a while loop??

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????

Answer 1

[Walter Roberson]

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

[IPSAS]

it can work whith the programmatically GUI?

[Steven]

Thank you so much Walter! I've been looking for a way to stop the loop for the whole day.

[Image Analyst]

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]

Hi I did your suggestion, but I can never stop routine on Pushbutton A. Shall I do something extra in PushburronB

Answer 2

[Geoff]

In your GUI, set some user data to your GUI handle.

In your loop, check this data and break accordingly.