GUIDE gui output -- "Attempt to reference field of non-structure array"

Hello!

I have a simple GUIDE gui that uses a slider to change the value in a static text box, as part of a larger project. I can get the value to change properly (have modified the slider step to do that). However, I need to have the gui output the value that was selected when the gui closes for use in other guis.

I keep getting "Attempt to reference field of non-structure array" when I run this. The code follows, and there are a number of %commented out attempts I have made. I've searched the Answers and looked at Doug Hull's video, and can't figure out what's wrong. Help is appreciated!

Doug Anderson

function varargout = slider_test3(varargin)
% SLIDER_TEST3 MATLAB code for slider_test3.fig
%      SLIDER_TEST3, by itself, creates a new SLIDER_TEST3 or raises the existing
%      singleton*.
%
%      H = SLIDER_TEST3 returns the handle to a new SLIDER_TEST3 or the handle to
%      the existing singleton*.
%
%      SLIDER_TEST3('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in SLIDER_TEST3.M with the given input arguments.
%
%      SLIDER_TEST3('Property','Value',...) creates a new SLIDER_TEST3 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before slider_test3_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to slider_test3_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help slider_test3

% Last Modified by GUIDE v2.5 12-Feb-2014 08:48:46

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @slider_test3_OpeningFcn, ...
                   'gui_OutputFcn',  @slider_test3_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before slider_test3 is made visible.
function slider_test3_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to slider_test3 (see VARARGIN)

% Choose default command line output for slider_test3

set(handles.slider1,'Value',2);
set(handles.slider1,'Max',22);
set(handles.slider1,'Min',2);
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);

% UIWAIT makes slider_test3 wait for user response (see UIRESUME)
 uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = slider_test3_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure

%   set(handles.output,'String','Junko'); %num2str(get(handles.slider1))); % = handles.slider1; %get(handles.slider1,'Value');
varargout{1} = handles.text3; %output; %'Junk'; %get(handles.slider1,'Value') ; %output;
%guidata(hObject,handles);

% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider
set(handles.text3,'String',(get(hObject,'Value')));

%set(handles.text3,'String',(get(handles.slider1,'Value')));
guidata(hObject,handles);

% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end

% --- Executes when user attempts to close figure1.
function figure1_CloseRequestFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hint: delete(hObject) closes the figure
%handles.output = handles.text3;
delete(hObject);

    if true
      % code
    end

[Douglas Anderson]

Hello again,

I wanted to add a comment: I just tried following Doug Hull's video on "Advanced getting an output from a guide gui" step by step from a blank gui, and got the same message "Attempt to reference field of non-structure array" when I tried to run "a = main", which should just give the handle!

[Walter Roberson]

Which line is the problem occurring on?

When you run the code be sure to run

slider_test3

and not

slider_test3.m

Also, you cannot run it by double-clicking on the .fig file; that will not work.