How to share variables in different callback function?

In my code,xdata exists in 'pushbutton1_Callback' function

function pushbutton1_Callback(hObject, eventdata, handles)
handles.xdata = xdata;
guidata(hObject,handles);

Then the xdata exists in handles.However,when I use ‘pushbutton1_Callback’ function in function ‘pushbutton2_Callback’，the xdata somehow disappears.

function pushbutton2_Callback(hObject, eventdata, handles)
pushbutton1_Callback(hObject, eventdata, handles)

I want to know what's wrong with it.And how can I get the xdata in pushbutton2_Callback.Thanks!

Answer 1

[TAB]

function pushbutton1_Callback(hObject, eventdata, handles)
handles = guidata(hObject);         % Get gui data 
handles.xdata = xdata;              % Add your data gui data 
guidata(hObject,handles);           % Update the gui data with new value 

function pushbutton2_Callback(hObject, eventdata, handles)
handles = guidata(hObject);         % Get gui data 
my_xdata = handles.xdata  ;         % Get your variable

[QiQin Zhan]

Cool,you idea works.Would you please tell me something more detailed what it means to get handles in a variable and why should we do that?Thanks a lot!

[TAB]

handles is nothing but the GUI data returned from function guidata(). I have modified my comments to be more clear.

See this thread and Matlab doc on guidata for more details.

[Walter Roberson]

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

Please read the documentation on the "guidata" function.

It may be easier if you think in terms of "master copy" (the two-input form of guidata updates the master copy) and "local version" (the one-input form of guidata copies the master copy into a local version that you can then make local revisions to.) And different routines can have different local copies and any of them might update the master copy when the routines have control.

[BHANESH BHADRECHA]

This works perfectly. Thank you very much.