how can I do it without using eval

Question

G A 2019-6-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/467553-how-can-i-do-it-without-using-eval

编辑： G A 2019-6-18

There are quite a few handles of uicontrols and uipanels named h1,h2...hN in my code exported by GUIDE. I want to create structure of handles with names handles.(Tag) for all uicontrols. How can I do it without using eval?

for k=2:N 
ns=num2str(k);
hs=eval(['h',ns]);
Tag=get(hs,'Tag');
handles.(Tag)=hs;
end

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Walter Roberson 2019-6-17

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If it is code exported by GUIDE, then GUIDE will automatically create those handles for you. It is done as part of the initialization of the gui. It goes something like

handles_with_tags = findobj(GUI, '-property', 'Tag');
for K = 1 : length(handles_with_tags)
    this_handle = handles_with_tags(K);
    thistag = get(this_handle, 'Tag');
    if isvarname(thistag)
      handles.(thistag) = this_handle;
    end
end

Except that it does extra work so that when it finds multiple objects with the same tag, it creates a vector of handles.

G A 2019-6-18

Thanks, Walter!

That is what I want. I was just modyfiing (mainly in learning purpose) my code from the form of GUIDE export to the form decribed in the tutorial:https://uk.mathworks.com/matlabcentral/fileexchange/24861-41-complete-gui-examples

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Answer 1

Adam Danz 2019-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/467553-how-can-i-do-it-without-using-eval#answer_379604

在 MATLAB Online 中打开

Assuming the handles are stored in a vector,

allhand = [h1,h2,h3];            %row vector 
tags = get(allhand, 'tag'); 
handles = cell2struct(num2cell(allhand)',tags); %no need for transpose if allhand is column vector

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G A 2019-6-18

编辑：G A 2019-6-18

The problem is that the handles are not stored in an array or may be stored manually. How to store them not manually without using eval - that was my question. Newertheless I accept your answer because I am satisfied by Walter's answer and I have learned something from yours.:)

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