How to modify the handles structure (GUI) from an external function
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Hi,
I am developing a GUI. I can modify the handles structure (for example handles.variable1 = 2) within callbacks. However I am not able to do the same within an external function. E.g., this does not work:
function [matrix, indexVector] = myFunction(handles)
handles.variable1 = 1;
It is important to note that myFunction does not belong to the GUI callbacks, it is simply a function I have created in another m file. When I call it I can read the handles struture (actually im passing them as a parameter) but when I try to modify them the modification is not recorded.
Best,
-MRR
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Risposta accettata
Sean de Wolski
il 8 Mar 2013
Modificato: Sean de Wolski
il 8 Mar 2013
function [matrix, indexVector] = myFunction(handles)
handles.variable1 = 1;
guidata(handles.figure1,handles)
Where figure1 is the 'Tag' of the figure. You want to make sure that you assign the handles structure to the right place (i.e. the figure). hObject is dynamic, handles will always have the field for the figure.
10 Commenti
Jan
il 20 Mar 2013
Modificato: Jan
il 20 Mar 2013
@MRR: Yes, of course, this is the expected behavior. Inside myFunction you update the handles struct and store it in the figure afterwards. Then after returned to Simulate_Callback, you use the local copy of handles with its value before calling myFunction() and overwrite the changes from inside this function. A suggestion for improvements:
function errorParameters = Simulate_Callback(hObject, eventdata, handles)
%some code here ...
handles = guidata(hObject); % Care for the newest version explicitly!
[output1, output2] = myFunction(hObject, handles);
handles = guidata(hObject); % Get the version updated in myFunction!
handles.variable1 = handles.variable1 + 1;
guidata(hObject, handles);
And inside myFunction(hObject, handles) I do:
handles.variable1 = 200; %or any other value
guidata(hObject, handles);
So Azzi's and Sean's answers hit the point already, but in your code there was a problem at another location, namely in the caller, which forgot to obtain the updated struct.
Più risposte (3)
Azzi Abdelmalek
il 8 Mar 2013
Use
function [matrix, indexVector] = myFunction(hObject,handles)
handles.variable1 = 1;
guidata(hObject,handles)
4 Commenti
zakaria
il 5 Giu 2014
handles = guihandles(gcbo); % if not presents in the other external function
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