MATLAB: GUIDATA save handles only after exiting callback

Question

Dear All,

I am currently working on a GUI using Matlab GUIDE.

I work with the handles to store some data to be available for all callbacks.

But here comes my problem.

When I introduce additionnal functions into the different callbacks and if those functions try to add specific data to the handles, I have a feeling that the handles is saved only after the callback terminates.

Here is my concrete example:

% Button Callback
function button1_Callback(hObject, eventdata, handles)
     % Call specific function
     myFunction(handles);
     % Use specific data
     myOperation = handles.myData + 1;
% Specific function
function myFunction(handles)
     % Store data in handles
     handles.myData = 1;
     % Save handles
     guidata(gcbo, handles);

If I proceed this way, I obtain the following error:

Reference to non-existent field 'myData'.

I partially solved the problem by waiting the callback to be closed. And then myData is indeed available for further processing.

My question is therefore the following:

Am I doing the data storage and save right? Is there a way to make myData available already inside the callback (as it is done in my example)?

I hope I was clear in the definition of my problem, in any case I can provide further information upon request.

Thank you very much for your help and have a nice day.

David N.

Answer 1

Here is a possible solution:

% Button Callback
function button1_Callback(hObject, eventdata, handles)
     % Call specific function
     handles = myFunction(handles);
     % Use specific data
     myOperation = handles.myData + 1;
% Specific function
function [newHandles] = myFunction(handles)
     % Store data in handles
     handles.myData = 1;
     % Save handles
     newHandles = handles;

Maybe gcbf could give also some results. I let you try^^