How to use 'Edit Text' efficiently in a GUI?

Question

Lisa Wu 2012-11-23

2
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/54587-how-to-use-edit-text-efficiently-in-a-gui

评论： siddharth 2014-12-9

采纳的回答： Arthur

在 MATLAB Online 中打开

I notices that there are two ways to ues it;

The tag of edit1 is edit1.

Method 1:

function edit1_callback()

         num1 = get(hObject,'string');
         handles.num1 = num1;
         guidatda(gcbo,handles);  % why need this command?

function pshbtn1_callback()

         y = handles.num1;
         guidata(gcbo,handles);  % why need it too?

Method 2:

function pshbtn_callback()

y = str2num(get(hObject,handles));

As shown above, what's the difference? And the effect of "guidata(gcbo,handles)" ? Thank you very much!

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Lisa Wu 2012-11-23

在 MATLAB Online 中打开

The Method 2 should be:

y = str2num(get(handles.edit1,'string'));

siddharth 2014-12-9

the second method works just fine. Thanks

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Answer 1

Arthur 2012-11-23

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/54587-how-to-use-edit-text-efficiently-in-a-gui#answer_66262

If you use guidata(gcbo,handles), you save the string of your textbox in the 'handles' structure; in your pshbtn_callback you subsequently read this value from handles again. I personally prefer method 2, where you read out the string of the textbox in the button callback. This has a few advantages:

you only use the handles structure for what it's supppost to (storing handles)
you retrieve the string at the very moment you need it (ensures that you have the string that is actually shown in the textbox)

Method 1 is not wrong though, it will work.