get(eventdata.NewValue,'Tag') ===>>> Error ??? Attempt to reference field of non-structure array.

Question

David Dapuero 2012-4-30

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https://ww2.mathworks.cn/matlabcentral/answers/36997-get-eventdata-newvalue-tag-error-attempt-to-reference-field-of-non-structure-array

评论： Steven Bierer 2014-4-2

采纳的回答： David Dapuero

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Hello, ¿somebody knows what is happening?

I can´t get the Selected data from a button group panel:

 function uipanel8_SelectionChangeFcn(hObject, eventdata, handles)
 Seleccion=get(eventdata.NewValue,'Tag')

It gives me the Error:

 ??? Attempt to reference field of non-structure array.
 Error in ==> Leitungsseilen>uipanel8_SelectionChangeFcn at 878
 Seleccion=get(eventdata.NewValue,'Tag')
 Error in ==> gui_mainfcn at 96
        feval(varargin{:});
 Error in ==> Leitungsseilen at 42
    gui_mainfcn(gui_State, varargin{:});
 Error in ==> hgfeval at 65
        evalin('base', fcn);
 Error in ==> uitools.uibuttongroup.childAddedCbk>manageButtons
at 80
    hgfeval(cbk, source, evdata);
 ??? Error while evaluating uicontrol Callback

I appreciate your help,

David

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Answer 1

David Dapuero 2012-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/36997-get-eventdata-newvalue-tag-error-attempt-to-reference-field-of-non-structure-array#answer_46422

I think that the reasson is for being a GUIDE GUI... it does not accept eventdata.NewValue

Instead of that I have used... get(hObject,'Tag') and this way it works.

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Answer 2

Daniel Shub 2012-4-30

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https://ww2.mathworks.cn/matlabcentral/answers/36997-get-eventdata-newvalue-tag-error-attempt-to-reference-field-of-non-structure-array#answer_46219

I am pretty sure that NewValue is not a typical field of the eventdata for a gui callback. Have you overloaded eventdata? Are you sure you do not want handles.NewValue, although that seems odd to me also.

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Daniel Shub 2012-5-1

Please post this as an answer and accept it.

Steven Bierer 2014-4-2

For clarification to future readers of this post, the .NewValue field IS standard for certain ui components like button groups. To the original poster, I've come across problems using button groups correctly as well. I have noticed that a UI component (like a radio button) won't be handled by the button group's 'SelectionChangeFcn' if it has its own callback defined.

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