how to stop a loop with a button in GUI

Question

Adam 2012-1-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26223-how-to-stop-a-loop-with-a-button-in-gui

I have a have that reads data from a device. I have made a GUI with GUIDE with a 'Read' and 'Stop Read" button.

The program contains a callback function for the Read, and the stop button and the Read callback uses the f_Read() function to read the data. I want the program to stop executing f_Read when i press the stop button. I was thinking that the while loop could evaluate handles.stop == 0, so that while handles.stop = 0, f_Read() will be executed, and then when i press the stop button handles.stop =1 and the while loop would stop. But it seems like it doesnt discover that handles.stop = 1, when i press the stop button, and therefore it just keeps executing f_Read(). What am i doing wrong? Or should i do it in a different kind of way?

function Read_button_Callback(hObject, eventdata, handles)
%Executes when the 'Read data' button is pressed, and lets the program
%read data from the smartbox
handles.stop=0
while handles.stop == 0
[data] = f_Read(2,2)
end
display('stopped')
return
function Stop_button_Callback(hObject, eventdata, handles)
%executes when the 'Stop' button is pressed
handles.stop = 1

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Answer 1

Sean de Wolski 2012-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/26223-how-to-stop-a-loop-with-a-button-in-gui#answer_34237

Please see my answer to this question:

Answers:Me!

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Daniel Shub 2012-3-20

Depending on how f_Read is implemented, the timer may not be able to break into such a simple loop. It is also not clear that handles is really a handle object, so the timer callback setting handles.stop might not break the loop.

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