How to interrupt while loop for GUI without escaping from the callback function.

Question

Eun Song Kim 2019-12-27

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https://ww2.mathworks.cn/matlabcentral/answers/498153-how-to-interrupt-while-loop-for-gui-without-escaping-from-the-callback-function

评论： Walter Roberson 2019-12-27

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Hi

I would like to camera module control with MATLAB GUI callback.

There is one toggle button.

if I push the toggle button first,

toggle_stat = 1

and

camera works.

After then, if I push the toggle button again,

toggle_stat = 0

and

camera works with other Exposure time.

this is what I want.

However, If I push the toggle button secondly.

MATLAB escape from the Module_start_toggle_Callback function immediatly and reacess Module_start_toggle_Callback function.

It means that the camera can't not stop correctly and can't not initialize again.

So this camera must Always excute the code 'Module.CaptureStop();'

So I want to know how to use toggle button using the code 'Module.CaptureStop();'

Please, give me the answer for this problem.

Thanks all.

% --- Executes on button press in Module_start_toggle.
function Module_start_toggle_Callback(hObject, eventdata, handles)
% hObject    handle to Module_start_toggle (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
clc
toggle_stat = get(handles.Module_start_toggle,'Value');
if (toggle_stat == 1) % 
    Module.initailize();
    Module.ExpsureTimeSet('Auto');
    Module.CaptureStart();
    
    while(toggle_stat == 1)
        images = Module.getImages();
        imshow(images,'Parent',handles.axes1)
        drawnow;        
    end 
   
    Module.CaptureStop(); 
end  
elseif (toggle_stat == 0)
    Module.initailize();
    Module.ExpsureTimeSet('500');
    Module.CaptureStart();
    
    while(toggle_stat == 1)
        images = Module.getImages();
        imshow(images,'Parent',handles.axes1)
        drawnow;        
    end 
   
    Module.CaptureStop();   
end

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Walter Roberson 2019-12-27

toggle_stat = get(handles.Module_start_toggle,'Value');

Must also go inside your while loops. You currently get() the value once but do not update it.

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How to interrupt while loop for GUI without escaping from the callback function.

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How to interrupt while loop for GUI without escaping from the callback function.

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