while closing the GUI in MATLAB 23a give following error

I have made gui where by pressing the pushbutton_2 grapgh is draw. to show any changes in the real time i have used the while loop in the function of pushbutton _2 and again some data is diplay in the text using the set(handle.text,'string',output); . when I interface this with the arduino uno borad, initialy it works fine, but athe time of closing or exit from GUI it through the following error.

hout how should I close or exit from GUI .

following are the error of programm.

----------------------------------------------------error-----------------------------------------------

Error using matlab.ui.control.UIControl/set

Invalid or deleted object.

Error in lidar>pushbutton2_Callback (line 435)

set(handles.disp1,'string',num2str(y1));

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in lidar (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)lidar('pushbutton2_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating DestroyedObject Callback.

[Mahesh]

%for example

function pushbutton1_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

while(1)

global a;

x= a.readVoltage('A0');

y=str2double('x');

set(handles.static_disp,'string',x);

end

--------------------------------------------

in above code I am facing problem

[Walter Roberson]

set(handles.static_disp,'string',x);

What do you expect that line to do if you have closed the window and so deleted the graphics object?

[Mahesh]

set(handles.static_disp,'string',x);

I used that command for showing the voltage reading of a A0 arduino analog chanal in a text block of gui. so when I closed my gui or exit from it, analog voltage which is showing on a text block should be also vanished.

Answer 1

[Steven Lord]

You could wrap that set call in a try / catch block and check if the handle to the text box isvalid in the catch block. If it is not valid, you can assume that the user likely closed the GUI and simply break out of the while loop. [If the handle is still valid, something else has gone wrong. You could try to handle it yourself, perhaps by checking the message or identifier of the exception that you caught, or you could just rethrow the error.]

[Mahesh]

@Steven Lord its work. thanks