How to share variables in different callback function?

Question

QiQin Zhan 2013-3-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/65720-how-to-share-variables-in-different-callback-function

评论： BHANESH BHADRECHA 2016-2-10

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!

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Answer 1

TAB 2013-3-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/65720-how-to-share-variables-in-different-callback-function#answer_77240

编辑：TAB 2013-3-4

在 MATLAB Online 中打开

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

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Walter Roberson 2013-3-4

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 2016-2-10