Issue with GUI editbox callback

I need to save the text entered into two edit boxes so that I can concatenate them with other strings to create the name of a desired file. Example code below:

function subject_editbox_Callback(hObject, eventdata, handles)

% hObject handle to subject_editbox (see GCBO)

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

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

input=get(hObject,'String');

display(input)

sub=input;

function trial_editbox_Callback(hObject, eventdata, handles)

% hObject handle to trial_editbox (see GCBO)

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

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

input = get(hObject,'String');

display(input)

trial = num2str(input);

% --- Executes on button press in createfile.

function createfile_Callback(hObject, eventdata, handles)

% hObject handle to createfile (see GCBO)

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

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

Note: variables "displacement and "file_type" specified in individual button group SelectionChangeFcn callbacks

filed=strcat(sub,displacement);

filedesi=strcat(filed,trial);

filedesired=strcat(filedesi, file_type)

display(filedesired)

When I click on the pushbutton, it says:

"Undefined function or variable 'sub'.

Error in Vicon_GUI_Zeke>createfile_Callback (line 225) filed=strcat(sub,displacement);

Error in gui_mainfcn (line 95) feval(varargin{:});

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

Error in @(hObject,eventdata)Vicon_GUI_Zeke('createfile_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback"

Answer 1

[Sara]

You need to save your variables (i.e. the strings from the editboxes) as fields of the structure handles. So correct your functions as the one below:

function subject_editbox_Callback(hObject, eventdata, handles)
input=get(hObject,'String');  
display(input)  
handles.sub=input;
guidata(hObject, handles);

Only then you can concatenate handles.sub with handles.displacement

[Zeke Merchant]

That worked. However, now I'm getting an error message that reads "reference to non-existent field 'displacement' "

[Sara]

You'll need to do the same for every variable that you want to carry around. For instance trial, will become handles.trial and you need:

guidata(hObject, handles);

at the end of the callback function. the code you posted did not include displacement, but it's included in the error so I thought that's the variable you wanted to concatenate. Is it trial instead?

[Zeke Merchant]

displacement and file_type are two variables that are defined by a button group. Each button group has three radio buttons to choose from. Would I need to define handles for each radio button in their individual callbacks or can I do so in the selectionchangefcn callback?

[Sara]

You can do that in selectionchangefcn (post the entire GUI if you can't do that yourself for some reason). Just use handles.your_variable_name

[Zeke Merchant]

function varargout = Vicon_GUI_Zeke(varargin) % VICON_GUI_ZEKE M-file for Vicon_GUI_Zeke.fig % VICON_GUI_ZEKE, by itself, creates a new VICON_GUI_ZEKE or raises the existing % singleton*. % % H = VICON_GUI_ZEKE returns the handle to a new VICON_GUI_ZEKE or the handle to % the existing singleton*. % % VICON_GUI_ZEKE('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in VICON_GUI_ZEKE.M with the given input arguments. % % VICON_GUI_ZEKE('Property','Value',...) creates a new VICON_GUI_ZEKE or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before Vicon_GUI_Zeke_OpeningFunction gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to Vicon_GUI_Zeke_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 Vicon_GUI_Zeke

% Last Modified by GUIDE v2.5 14-Jul-2014 13:30:31

% Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Vicon_GUI_Zeke_OpeningFcn, ... 'gui_OutputFcn', @Vicon_GUI_Zeke_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 Vicon_GUI_Zeke is made visible. function Vicon_GUI_Zeke_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 Vicon_GUI_Zeke (see VARARGIN)

% Choose default command line output for Vicon_GUI_Zeke handles.output = hObject;

% Update handles structure guidata(hObject, handles);

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

% --- Outputs from this function are returned to the command line. function varargout = Vicon_GUI_Zeke_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 varargout{1} = handles.output;

function subject_editbox_Callback(hObject, eventdata, handles)

% hObject handle to subject_editbox (see GCBO)

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

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

input=get(hObject,'String');

display(input)

handles.sub=input

guidata(hObject, handles);

% Hints: get(hObject,'String') returns contents of subject_editbox as text

% str2double(get(hObject,'String')) returns contents of

subject_editbox as a double

% --- Executes during object creation, after setting all properties.

function subject_editbox_CreateFcn(hObject, eventdata, handles)

% hObject handle to subject_editbox (see GCBO)

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

% handles empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.

% See ISPC and COMPUTER.

if ispc && isequal(get(hObject,'BackgroundColor'),

get(0,'defaultUicontrolBackgroundColor'))

    set(hObject,'BackgroundColor','white');

end

% --- Executes on button press in radiobutton1.

function radiobutton1_Callback(hObject, eventdata, handles)

% hObject handle to radiobutton1 (see GCBO)

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

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

% Hint: get(hObject,'Value') returns toggle state of radiobutton1

% --- Executes on button press in radiobutton4.

function radiobutton4_Callback(hObject, eventdata, handles)

% hObject handle to radiobutton4 (see GCBO)

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

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

% Hint: get(hObject,'Value') returns toggle state of radiobutton4

% --- Executes on button press in radiobutton16.

function radiobutton16_Callback(hObject, eventdata, handles)

% hObject handle to radiobutton16 (see GCBO)

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

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

% Hint: get(hObject,'Value') returns toggle state of radiobutton16

% --- Executes on button press in radiobutton3LD.

function radiobutton3LD_Callback(hObject, eventdata, handles)

% hObject handle to radiobutton3LD (see GCBO)

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

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

% Hint: get(hObject,'Value') returns toggle state of radiobutton3LD

% --- Executes on button press in radiobutton3LA.

function radiobutton3LA_Callback(hObject, eventdata, handles)

% hObject handle to radiobutton3LA (see GCBO)

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

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

% Hint: get(hObject,'Value') returns toggle state of radiobutton3LA

% --- Executes on button press in radiobutton3LV.

function radiobutton3LV_Callback(hObject, eventdata, handles)

% hObject handle to radiobutton3LV (see GCBO)

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

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

% Hint: get(hObject,'Value') returns toggle state of radiobutton3LV

function trial_editbox_Callback(hObject, eventdata, handles)

% hObject handle to trial_editbox (see GCBO)

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

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

input = get(hObject,'String');

display(input)

handles.trial=input;

guidata(hObject, handles);

% Hints: get(hObject,'String') returns contents of trial_editbox as text

% str2double(get(hObject,'String')) returns contents of

trial_editbox as a double

% --- Executes during object creation, after setting all properties.

function trial_editbox_CreateFcn(hObject, eventdata, handles)

% hObject handle to trial_editbox (see GCBO)

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

% handles empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.

% See ISPC and COMPUTER.

if ispc && isequal(get(hObject,'BackgroundColor'),

get(0,'defaultUicontrolBackgroundColor'))

    set(hObject,'BackgroundColor','white');

end

% --- Executes when selected object is changed in displacement_buttongroup.

function displacement_buttongroup_SelectionChangeFcn(hObject, eventdata, handles)

% hObject handle to the selected object in displacement_buttongroup

% eventdata structure with the following fields (see UIBUTTONGROUP)

% EventName: string 'SelectionChanged' (read only)

% OldValue: handle of the previously selected object or empty if none was selected

% NewValue: handle of the currently selected object

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

switch get(eventdata.NewValue,'Tag') % Get Tag of selected object.

    case 'radiobutton1'

        handles.displacement='afc01c1asfh_';

    case 'radiobutton4'

        handles.displacement='afc04c1asfh_';

    case 'radiobutton16'

        handles.displacement='afc16c1asfh_';

guidata(hObject, handles);

end

% --- Executes when selected object is changed in typedata_buttongroup.

function typedata_buttongroup_SelectionChangeFcn(hObject, eventdata, handles)

% hObject handle to the selected object in typedata_buttongroup

% eventdata structure with the following fields (see UIBUTTONGROUP)

% EventName: string 'SelectionChanged' (read only)

% OldValue: handle of the previously selected object or empty if none was selected

% NewValue: handle of the currently selected object

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

switch get(eventdata.NewValue,'Tag') % Get Tag of selected object.

    case 'radiobutton3LD'

        handles.file_type='.3LD';

    case 'radiobutton_3LV'

        handles.file_type='.3LV';

    case 'radiobutton3LA'

        handles.file_type='.3LA';

guidata(hObject, handles);

end

% --- Executes on button press in createfile.

function createfile_Callback(hObject, eventdata, handles)

% hObject handle to createfile (see GCBO)

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

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

handles = guidata(hObject);

filed=strcat(handles.sub, handles.displacement);

filedesi=strcat(filed, handles.trial);

filedesired=strcat(filedesi, handles.file_type)

display(filedesired)

guidata(hObject,handles)

[Sara]

In

displacement_buttongroup_SelectionChangeFcn
typedata_buttongroup_SelectionChangeFcn

move guidata(hObject, handles); after the switch end.

Answer 2

[Ben11]

You need to "share" the data between the different callbacks of your GUI, otherwise each callback does not know what is in other callbacks.

As a solution you could store both names you wish to concatenate in the GUI handles structure and get them in any callback you want. For example you could have:

function subject_editbox_Callback(hObject, eventdata, handles)

% hObject handle to subject_editbox (see GCBO)

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

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

input=get(hObject,'String');

display(input)

handles.sub=input;

guidata(hObject,handles); % IMPORTANT, keeps the handles structure updated

where handles.sub contains the name you want to use in other callbacks. Then in those callbacks, you retrieve the structure with this:

handles = guidata(hObject)

...insert your code here
guidata(hObject,handles)

Hope it's clear enough :) If not please ask for more details.