Remember that the values of handles is fixed at the time, this callback has been defined. So if the fields "pleasewait" and "i1" did not exist at this time, they are not available in the callback:
function CreateGUI
handles.Fig = figure;
handles.Button = uicontrol('Callback', {@myCallback, handles});
handles.Axes = axes; % After defining the callback!
end
function myCallback(ButtonH, EventData, handles)
handles.Axes % ERROR!
end
Prefer the function guidata to handle this dynamically:
function CreateGUI
handles.Fig = figure;
handles.Button = uicontrol('Callback', @myCallback);
handles.Axes = axes; % After defining the callback!
guidata(handles.Fig, handles); % handles struct is stored in the figure
end
function myCallback(ButtonH, EventData)
handles = guidata(ButtonH); % Obtain the current value
end
Now you can change fields of the handles struct in callbacks also:
function myCallback(ButtonH, EventData)
handles = guidata(ButtonH); % Obtain the current value
handles.newValue = 1;
guidata(ButtonH, handles); % Same as guidata(handles.Fig, handles)
end
Afterwards handles.newValue is available in all callbacks, which retrieve the current value by guidata.
