How to use variables in between GUI function?

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chlor thanks 2016-7-25

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评论： chlor thanks 2016-7-27

I am very new to GUI and so far for my understanding is that you can only put a tag's name behind handles. to communicate between different functions. For example, one uses axes(handles.axes1) inside a push button function.

For my case, I have several functions inside a GUI and there is one variable that is produced by one function, which is not defined previously when I made the GUI layout by GUIDE, it is only produced when the code is run and I would like to use it later in a pushbutton function, in this case, what should I do to make this variable outside of its mother function in order to be used in my pushbutton function?

Sorry if I sound confusing.

Any discussion/help is welcomed! Thanks!

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采纳的回答

Azzi Abdelmalek 2016-7-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/297123-how-to-use-variables-in-between-gui-function#answer_229728

在 MATLAB Online 中打开

your_variable=10
handles.your_variable=your_variable
guidata(hObject,handles)

To call the variable

your_variable=handles.your_variable

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Adam 2016-7-26

编辑：Adam 2016-7-26

handles is just a simple struct, it is nothing magic. The fields that get added to it during creation of the GUI are the GUI components, these are graphics objects, each of which support the set syntax (though now since R2014b they also support the dot based class syntax) and these are the things that will have callbacks attached and which you interact with in those callbacks using your tags.

However, because handles is just a struct, you can add any field you want to it just like any other struct. These fields can be whatever you want - new graphics objects that weren't defined in GUIDE, cell arrays, user classes, simple scalar doubles, etc.

The 'magic' comes from the guidata( hObject, handles ) line which saves this handles struct back into your GUI so that next time you trigger a callback this version of the handles struct is passed to it rather than the one that was present immediately after creation of the GUI. If you miss this line out then your changes were just made to a local copy of the handles structure which goes out of scope when the current function ends.

Adam 2016-7-27

在 MATLAB Online 中打开

Anything that changes non-graphics objects data on the handles struct will need a call to guidata after it in order to save it back into the main GUI.

If you have factored out a function from a callback or are using listeners you may not have 'hObject' though. In this case you can use gcbo instead or pass the handle of the main GUI down to your function and use

handles = guidata( hGUI );

to extract the handles struct, hGUI being the handle to your main GUI.

chlor thanks 2016-7-27

This makes sense, thanks for the tips! I will keep them in mind.

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