guidata doesn't save my data, why?

I have a GUI made in GUIDE. I need to store some data within functions and they must be reachable by other callbacks. I am using guidata like the following:

   function MyFunction(input1,input2,...,inputN)
     MyData = CalculateMyData(inputs);
     handles.DataToSave = MyData;
     guidata(gcf(),handles)
   end

Later in another Callback I'm trying to get back the data and save it to a file like the following:

    function SaveData(handles)
      SavedData = handles.DataToSave;
      dlmwrite(MyFile,SavedData,'\t')
    end

However, the field DataToSave no longer exists. I know that the handles and the guidata are not the same structure, therefore I tried the following code as well:

    function SaveData(handles)
      MyGUIData = guidata(gcf());
      SavedData = MyGUIData.DataToSave;
      dlmwrite(MyFile,SavedData,'\t');
    end

Unfortunately this code does not work either. How can I solve this problem? Any help is appreciated. László

Answer 1

[Luffy]

I did not exactly understand,but you can try this method:

The data that you want to save in your 1st function,save it to base workspace.

 assignin('base','handles.DataToSave','MyData');

Now that it is saved in base workspace,use it in your 2nd function by.

 v = evalin('base','handles.DataToSave');

That Data is now in v,use v in your function where you wnt to.

Just see u hv handles.DataToSave in your base workspace.

Or this should help:

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

Answer 2

[László Arany]

Well, this does the trick, however, I still don't understand why my method doesn't work.

Answer 3

[Andrei]

I have a similar problem. But I do not understand the cause

Answer 4

[Sean de Wolski]

I am guessing that the use of gcf() is what is making this not work. If the figure's HandleVisibility is 'off' or 'callback', gcf() will create a new figure to be the current figure.

To fix it, rather than using gcf, use handles.( Tag of your figure ).