How to get the value from the checboxes after push a Button?

Hi guys, i have a guide, that creates a several checkboxes and a Pushbutton "enter" in the dialog box. What i want is, when i choose one of the checkboxes and then push the button "enter", the state of the checkbox, that i have chosen, should be saved in the variable "checkboxValues" and the dialog box should be closed. You can see my code, it doesn't work and showed me an error. How can i solve this problem? Thanks!

handles.figure = dialog('position',[56 224 150 155]);

handles.label={'True Positiv' 'True Negative' 'False Negative' 'Irrelevant'};

for k=1:4

    h_checkbox(k) = uicontrol(handles.figure , 'Style','checkbox','String',handles.label(k), ...
                              'Position',[10 30*k 110 20]);
end

h.p = uicontrol(handles.figure ,'style','pushbutton','units','pixels',... 'position',[30 5 90 20],'string','OK',... 'callback',@enter_call);

function enter_call(hObject, eventdata, handles)

hCheckboxes = findobj(handles.figure, 'Style', 'checkbox');

checkboxValues = get(hCheckboxes, 'Value');

close(gcbf)

Answer 1

[Kevin Chng]

Hi Ma Le Thai,

Hope my solution help you

clear all
close all

% Create figure & its components
figure = dialog('position',[56 224 150 155]);
handles.label={'True Positiv' 'True Negative' 'False Negative' 'Irrelevant'};
for k=1:4
      handles.h_checkbox(k) = uicontrol(figure , 'Style','checkbox','String',handles.label(k), ...
                              'Position',[10 30*k 110 20]);
end 
handles.push = uicontrol(figure ,'style','pushbutton','units','pixels',... 
    'position',[30 5 90 20],'string','OK');
set(handles.push,'callback',@enter_call);
guidata(figure,handles);
% Call back function
function enter_call(hObject, eventdata, handles)
handles = guidata(hObject);
checkboxValues = get(handles.h_checkbox, 'Value')
close(gcf)
end

As per my knowledge, guide does not pass handles automatically, therefore, we have to save the handle in the startup and then load the handle in the callback. I'm not sure others have better explanation for it or not.

[Mai Le Thai]

Hi Kevin, when I tried to work with your codes. it always showed me an error:

Reference to non-existent field 'h_checkbox'.

[Kevin Chng]

Did you copy my script entirely? I don't have error in running it.

May I know what version of MATLAB are you using?

Remember to clear your workspace to avoid any confusion.

[Mai Le Thai]

I am using the R2015b. When i copy your script entirely, it shoed me another error:

Error: File: probe.m Line: 16 Column: 1

Function definitions are not permitted in this context.

[Kevin Chng]

As per I know, scripts cannot have functions in them before R2016b. There are M-script and M-function. if first line don't have the command 'function', then it is M-script.

Therefore, you copy the function and put them in new script, then save it as enter_call. Refer to attached.

[Mai Le Thai]

Upps, thanks four your help! It's working now:)

[Kevin Chng]

Hi Mai Le, i don't have this error. I guess you want the checkboxValues return to you for everytime execute the function choosedialog().

first function :

function checkboxValues=choosedialog()
global checkboxValues
figure = dialog('position',[56 224 150 155]);
handles.label={'Irrelevant' 'False Negative' 'True Negative' 'True Positiv'};
for k=1:4 
  handles.h_checkbox(k) = uicontrol(figure , 'Style','checkbox','String',handles.label(k), ... 
      'Position',[10 30*k 110 20]);
end
handles.push = uicontrol(figure ,'style','pushbutton','units','pixels',...
                     'position',[30 5 90 20],'string','OK');
set(handles.push,'callback',@enter_call);
guidata(figure,handles);
waitfor(figure);
end

Second function :

function checkboxValues=enter_call(hObject, eventdata, handles)
global checkboxValues
handles = guidata(hObject);
checkboxValues = get(handles.h_checkbox, 'Value');
close(gcf)
end

Will it work for your case?

global is not highly recommend to be used. However, for your inquiries, I don't have better solution.

[Kevin Chng]

Do you mind accept my answer if my solution is working for you?

Answer 2

[Image Analyst]

If you're returning handles.output, simply concatenate them all together:

handles.output = [handles.checkbox1.Value, handles.checkbox2.Value, handles.checkbox3.Value];