GUI varargout does not update

I've build a GUI that let users manually adjust a segmentation. However, varargout only 'captures' the first correction made. Any other corrections are not represented in my final output. My varargout function looks as follows:

function varargout = Clean_images_OutputFcn(hObject, ~, handles) 

handles=guidata(hObject);
uiwait
% 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)

varargout{1} = handles.MC_segmentation;
varargout{2}=handles.figure1;
uiresume

Furthermore, I have an callback and pushbutton to close the GUI.

% --- Executes on button press in Push_end.
function Push_end_Callback(hObject, eventdata, handles)
handles=guidata(hObject);
uiresume
varargout{1} = handles.MC_segmentation;
delete( handles.figure1)

How can I constantly keep updating my output?

[Geoff Hayes]

Myrthe - does handles.MC_segmentation correspond to your first correction? How are you updating this in your code (to capture other corrections)?

[Adam]

Why do you have multiple

uiresume

instructions? After the first I imagine your OutputFcn is fired and then it won't be called again. You can easily check when it is called though just by having a breakpoint in.

If you didn't have a uiresume in your pushbutton callback then it would probably work for a 1-time return at the end, but if you want to keep returning multiple results as you get them from an open GUI then you can't do this via the OutputFcn as it will only be triggered once.

[Rik]

Outputs do not dynamically update in Matlab. You could probably design a class that does that. That might work like this: have a property in that class containing your segmentation, and then have a getter method that attempts an update by loading the guidata. If the update fails becose the GUI was closed you can return the previously loaded result, and otherwise you update your stored property as well.

[Myrthe B.]

Geoff,

I have two buttons and callbacks for the manual correction of the segmentation. Each time I push the button this is updated. This works fine, which I know because I show the correction in realtime.

Rik and Adam, I'll will look into your thoughts!

[Myrthe B.]

For now, I fixed it by saving the end result in a .mat file and loading this after closing my gui. Not the prettiest solution, but it works.

Answer 1

[Rik]

Instead of using the slow disk to save and store data, you could use setappdata instead. Since you wish to close the figure, you should use the graphics root as your target object. The class I described in a comment could use a similar structure as well if you prefer.

%in your GUI
setappdata(0,'MC_segmentation',handles.MC_segmentation)

%in your code afterwards
MC_segmentation=getappdata(0,'MC_segmentation');