Need to press button twice to update variable in MATLAB GUI

Question

I have the following code as part of my MATLAB GUI code:

k = waitforbuttonpress;
if k==0               
   if strcmp(get(handles.YESNO,'String'),'Y')

        hint = 1;
    else
        hint = 0;
    end                
else
    hint = 0;
end

I wait for the user to press one of the two YES or NO buttons. Inside each of these callbacks I update the variable handles.YESNO as set(handles.YESNO,'String','Y'); or set(handles.YESNO,'String','N'); respectively.

When I execute my MATLAB GUI, I have to press the YES button twice for the value to take into effect. Any tips/hints to overcome this issue?

This is what I have in my YES Callback.. function YES_Callback(hObject, eventdata, handles) set(handles.YESNO,'String','Y'); guidata(hObject,handles) — Dhiraj, Oct 13 '15 at 18:24
[Use the debugger](http://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html). — sco1, Oct 13 '15 at 18:41

score 0 · Accepted Answer · answered Oct 13 '15 at 21:30

0

I believe that the waitforbuttonpress mask your callback. Instead, block your executation with uiwait that waits for your figure to close or to uiresume called by the buttons callbacks.

answered Oct 13 '15 at 21:30

Lior Cohen

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I did not completely understand what you mean, but when I use the debugger and put breakpoints it works fine. But it does not in actual runtime. Probably "... mask your callback" is whats happening (if that is a thing). So uiwait is called to wait for user input and uiresume should be put inside the callbacks? – Dhiraj Oct 13 '15 at 22:09

Need to press button twice to update variable in MATLAB GUI

1 Answers1