GUI: Can't access data from another callback function with handles

Question

Peter Smith 2019-8-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478335-gui-can-t-access-data-from-another-callback-function-with-handles

评论： Peter Smith 2019-9-3

I'm using GUIDE, and I've imported data like this:

function control_browse_button_Callback(hObject, eventdata, handles)
% hObject    handle to control_browse_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of control_browse_button
[control_file control_pathname] = uigetfile({'*.xlsx'}, 'File Selector');
set(handles.control_filename,'String', control_file);
[control_data control_labels] = xlsread(control_file);
handles.control_data = control_data;
handles.control_labels = control_labels;

And then I attempted to access control_labels:

function loadfile_button_Callback(hObject, eventdata, handles)
% hObject    handle to loadfile_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of loadfile_button
for i = 3:size(handles.control_labels,1)
ctrl_labels{i-2} = handles.control_labels{i,1};
end
....
%(rest of the code for this callback)
...

But I'm getting the error:

Reference to non-existent field 'control_labels'

Am I not using handles properly? How should I access control_labels from another callback function?

Thanks!

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Rik 2019-8-31

It's also a good idea to initialize the field when starting the GUI, and trigger an error if the user clicks the load button before the control browse button.

@G A: please move your answer to the answer section.

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