I have a problem with 'togglebutton' in MATLAB 2012a GUI

Question

Sadi Altamimi 2013-2-14

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/63517-i-have-a-problem-with-togglebutton-in-matlab-2012a-gui

Hello everyone;

Let us say we have a text file that contains a number. we need to continuously read the file and print that number on the screen. (Obviously we will need some kind of loop)

Note that reading process should start only when a toggle button is pressed, and stop once the button is pressed again (i.e. released).

My problem is that every time I run the program, it fall in an infinite loop! I assumed that the function will monitor the button state since I include the 'get' function in the loop.

Here is the code: (I have replaced the reading commands with a simple addition statement to simplify the work)

    function tbtn1_Callback(hObject,eventData)
    % 
        isPressed = get(hObject,'Value');  % read the button state
        if isPressed
            set(hObject,'String','Stop');
        else
            set(hObject,'String','Start');
        end
        ii = 0;
        while isPressed
           ii = ii+1  %instead of reading the text file
           isPressed = get(hObject,'Value'); % check if the button released
        end
    end