Closing gui window *.gif

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Michael Adelman
Michael Adelman on 23 Jul 2012
I created gui that has uipanel with two radio buttons. I'm running two endless loops for each radio button that know to switch on from another smoothly. When I close gui window I get errors as follows:
??? Error using ==> guidata at 89
H must be the handle to a figure or figure descendent.
Error in ==> Demo>uipanel1_SelectionChangeFcn at 262
guidata(hObject, handles);
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> Demo at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==>
@(hObject,eventdata)Demo('uipanel1_SelectionChangeFcn',get(hObject,'SelectedObject'),eventdata,guidata(get(hObject,'SelectedObject')))
Error in ==> hgfeval at 63
feval(fcn{1},varargin{:},fcn{2:end});
Error in ==> uitools.uibuttongroup.childAddedCbk>manageButtons at 80
hgfeval(cbk, source, evdata);
??? Error while evaluating uicontrol Callback
Can you suggest what is the proper way to close gui window?
Thanks,
  5 Comments
Michael Adelman
Michael Adelman on 24 Jul 2012
yes.
button1 or button2 values taken from 'uibuttongroup' panel and then passed to the loops.
Jan
Jan on 25 Jul 2012
Let me ask again: Do you assume, that the value of button1 or button2 is changed, during Matlab processes the infinite loop? Or in other words, is your function equivalent to:
if button1
while true
...
end
end

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Answers (3)

Jan
Jan on 24 Jul 2012
A secure solution would be:
  • Create two flags in the figure's local data:
setappdata(FigureHandle, 'LoopEntered', false);
setappdata(FigureHandle, 'StopLoop', false);
  • Enable a flag, when one of the loops is started:
setappdata(FigureHandle, 'LoopEntered', true)
  • When the endless loop is finished (at least when this is not a contradiction...), disable the flag again:
setappdata(FigureHandle, 'LoopEntered', false)
  • Inside the CloreRequestFcn and DeleteFcn (called when the figure is closed or deleted) set another flag to stop the loops:
if getappdata(FigureHandle, 'LoopEntered')
setappdata(FigureHandle, 'StopLoop');
while getappdata(FigureHandle, 'LoopEntered')
pause(0.1);
end
end
  • Inside the loops, check the stop flag:
while XYZ
if get(FigureHandle, 'StopLoop')
break;
end
...
end
setappdata(FigureHandle, 'LoopEntered', false);
Then you have two dynamic locks: The running loop locks the closing of the figure. Closing the figure blocks the execution of the loop.
  2 Comments
Michael Adelman
Michael Adelman on 24 Jul 2012
Hello Jan,
does it matter if I use guide to create gui (for example, figure local data)?
does the code might change?
thanks,
Jan
Jan on 24 Jul 2012
Even GUIDE figures are 100% full and complete Matlab figures. There is not even one spark of magic added by GUIDE. Therefore it does not matter, if you create the figure directly by a program, or if you let GUIDE create the program to create the figure.

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Michael Adelman
Michael Adelman on 25 Jul 2012
Hello Jan,
I followed your suggestion with small adjustments:
1. the endless loops never stops, only switches one to other. Because of that, I left in the CloseRequestFcn and DeleteFcn used these two lines:
if getappdata(handles.figure1, 'LoopEntered')
setappdata(handles.figure1, 'StopLoop', true);
end
2. Once I was able to stop the endless loop, I used these two lines at the end of each endless loop:
setappdata(handles.figure1, 'LoopEntered', false);
delete(handles.figure1);
to delete the window - I get no errors here.
3. Once I deleted figure1, from unknown reason the pointer returns back to the loop and tries to execute the condition that stops endless loop, attached list of errors:
??? Error using ==> getappdata
Invalid object handle
Error in ==> Demo>uipanel1_SelectionChangeFcn at 266
if getappdata(handles.figure1, 'StopLoop')
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> Demo at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==>
@(hObject,eventdata)Demo('uipanel1_SelectionChangeFcn',get(hObject,'SelectedObject'),eventdata,guidata(get(hObject,'SelectedObject')))
Error in ==> hgfeval at 63
feval(fcn{1},varargin{:},fcn{2:end});
Error in ==> uitools.uibuttongroup.childAddedCbk>manageButtons at 80
hgfeval(cbk, source, evdata);
??? Error using ==> pause
Error while evaluating uicontrol Callback
??? Error using ==> getappdata
Invalid object handle
Error in ==> Demo>uipanel1_SelectionChangeFcn at 352
if getappdata(handles.figure1, 'StopLoop')
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> Demo at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==>
@(hObject,eventdata)Demo('uipanel1_SelectionChangeFcn',get(hObject,'SelectedObject'),eventdata,guidata(get(hObject,'SelectedObject')))
Error in ==> hgfeval at 63
feval(fcn{1},varargin{:},fcn{2:end});
Error in ==> uitools.uibuttongroup.childAddedCbk>manageButtons at 80
hgfeval(cbk, source, evdata);
??? Error using ==> drawnow
Error while evaluating uicontrol Callback
??? Error using ==> getappdata
Invalid object handle
Error in ==> Demo>uipanel1_SelectionChangeFcn at 266
if getappdata(handles.figure1, 'StopLoop')
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> Demo at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==>
@(hObject,eventdata)Demo('uipanel1_SelectionChangeFcn',get(hObject,'SelectedObject'),eventdata,guidata(get(hObject,'SelectedObject')))
Error in ==> hgfeval at 63
feval(fcn{1},varargin{:},fcn{2:end});
Error in ==> uitools.uibuttongroup.childAddedCbk>manageButtons at 80
hgfeval(cbk, source, evdata);
??? Error while evaluating uicontrol Callback
Please advice.
  5 Comments
Walter Roberson
Walter Roberson on 25 Jul 2012
ishandle() is not valid after deletion.
Michael Adelman
Michael Adelman on 25 Jul 2012
Jan, what you say that I need to update before deleting an object?
It's a good idea to use TIMER, but I don't know to use it properly. Once I'll study this I will send some feedbacks about that.

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Michael Adelman
Michael Adelman on 28 Jul 2012
Thank you for your help.
I finally got this the way I want it. Using flags of 'LoopEntered' and 'StopLoop' get the job done. Now I can continue to the next step of the code.
Michael

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