Browse Button in GUIDE issue

Hi, I have a callback function for a Browse button (to select a file) in a GUIDE generated fig:

% --- Executes on button press in browse_pushbutton.
function browse_pushbutton_Callback(hObject, eventdata, handles)
% hObject    handle to browse_pushbutton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[FileName,PathName] = uigetfile({'*.dat;*.txt','Input Files (*.dat, *.txt)';'*.*','All Files (*.*)'},'Select a file for input');
if ~isequal(FileName,0)
    set(handles.path_text,'String',[PathName FileName]);
end

Issue I am having is after I select the file in the uigetfile window and click on open, I get the following error:

Attempt to reference field of non-structure array.

Error in compute_ENOB>browse_pushbutton_Callback (line 302)
    set(handles.path_text,'String',[PathName1 FileName1]);

Error in gui_mainfcn (line 96)
        feval(varargin{:});

Error in compute_ENOB (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
@(hObject,eventdata)compute_ENOB('browse_pushbutton_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

I am not sure what is wrong.

[Leor Greenberger]

I just repuposed the browse button to do this:

function browse_pushbutton_Callback(hObject, eventdata, handles)

set(handles.path_text,'String','blah');

When I save the .m file and run the .fig file, it works. But if I restart MATLAB and try it again, it errors!

Answer 1

[Fangjun Jiang]

In your code, it says:

set(handles.path_text,'String',[PathName FileName])

In the error message, it says:

set(handles.path_text,'String',[PathName1 FileName1])

Wrong variable name?

[Leor Greenberger]

That was a typo. I appended the 1 to the variable name to see if it would work, but I had already copied the previous error message before I made the changes. As validation, I repurposed the browse button to do the following:

function browse_pushbutton_Callback(hObject, eventdata, handles)

set(handles.path_text,'String','blah');

and this works if I edit the .m file, save it, and run the .fig. But if I were to exit MATLAB, and then run the .fig again, it would produce that error message. Strange.

[Leor Greenberger]

I even just deleted the edit text box, created a new one, with a new tag, and tried to the browse pushbutton callback function to:

set(handles.path_text,'String','blah');

again, it worked right after, but when I restarted MATLAB, it produced an error:

Attempt to reference field of non-structure array.

Error in compute_ENOB>browse_pushbutton_Callback (line 304)

set(handles.path_text_,'String','blah');

Error in gui_mainfcn (line 96)

feval(varargin{:});

Error in compute_ENOB (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in

@(hObject,eventdata)compute_ENOB('browse_pushbutton_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

[Fangjun Jiang]

Don't double-click the .fig file to open it. Is that what you did? See

http://www.mathworks.com/matlabcentral/answers/17138-able-to-run-gui-from-guide-command-interface-but-not-when-opening-fig-straight-in-folder

[Leor Greenberger]

Yes, I double clicked! Funny how someone just had the same issue only 4 days ago. Thanks!