share data between guis

Question

Joe Nunes 2011-2-25

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Hello,

I am trying to build a main gui and various sub guis to configure some data. This data can be an array. I've seen methods to update handles between guis, but not data.

What would be the best way to achieve this ?

Thanks in advance

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Walter Roberson 2011-2-25

Please see the FAQ,

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

Eric 2012-1-10

My preference (mentioned in the FAQ Walter cites) is to use application data (i.e., getappdata and setappdata). In the comment section at the start of each GUI I keep a list and description of what appdata values are stored.

I would avoid using the UserData property as in the future you may want to store other variables as well. Then you may have to switch from storing an array to storing a structure.

I prefer not to use the handles structure so that this structure always just refers to uicontrol handles.

These are personal preferences and there are a variety of ways to solve the problem, though.

-Eric

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Answer 1

Héctor Corte 2012-1-10

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在 MATLAB Online 中打开

Another way is to use global variables. But remember to write

global variable_name

in every place you use that variable. For example:

%In this function we set the value of global variable b
function Y=fun1(x,a)
global b
b=a;
Y=a*x
end
%In this function we use the global variable b wich was defined 
% on fun1.
function y=fun2(x)
global b
Y=b*x
end

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Robert Cumming 2012-1-10

globals are generally the wrong way to go - especially if they are so basically named. It is possible for the variable to be changed without your knowledge so it can be hard to trace.

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Answer 2

Alex 2012-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/2002-share-data-between-guis#answer_33762

http://www.mathworks.com/matlabcentral/fileexchange/33816-example-using-a-matlab-class-to-control-a-gui

You can achieve this through using matlab Classes. the link above is to a File Exchange example using a class to control a gui.

It's pretty easy to expand the example class from controlling a single GUI to multiple GUI's, and the parent class will contain all of the desired data and easily pass it to the gui's.