access data from one app in another app in appdesigner

Question

Sampath Rachumallu 2019-6-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/468930-access-data-from-one-app-in-another-app-in-appdesigner

评论： Adam Danz 2020-4-27

I want to access value of string entered in editbox of app1 in app2.This is the code i have written

%app1 code
%in a button_press callback in app1
val=app1.edit.Value;
setappdata(app1.Uifigure,val);   %app1.UIfigure is the UIfigure name in app1
%app2 startup function
getappdata(app1.Uifigure,val);

i am getting error like

The property 'Uifigure' in class 'app1' must be accessed from a class instance because it is not a Constant property

kindly help me to overcome to this error

thanks in advance

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Answer 1

Sampath Rachumallu 2020-4-27

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/468930-access-data-from-one-app-in-another-app-in-appdesigner#answer_428612

在 MATLAB Online 中打开

Found the solution. Pasting it here for reference. In app designer we can acess an app data using 'app' handle. In the above case we can store the app handle of app1 in its StartupFcn in a global variable:

%Startup function of app1
function startupFcn(app)
      global app1_handle=app;
end
%Button press callback function in app2
function buttonpress_callback(app)
    global app1_handle;
    text_entered=app1_handle.edit.Value; %Where edit the edit_field id used in app1
end

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Adam Danz 2020-4-27

Be careful with global variables. They usually cause problems and area almost always avoidable.

To have access to the app handle anywhere within your app, set the app1_handle variable as a private (or public) property of your app. Here are instructions: https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html

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