accessing variables in multiple .mlapp files - Matlab app designer

hello,

i am wondering how to share variables between 2 matlab app designer (.mlapp) files. I have one file GUI2.mlapp and another file GUI4.mlapp. I would like to share a variable from GUI.mlapp to GUI4.mlapp. How am i able to do this?

matlab version: R2019B

Thank you!

Answer 1

[Adam Danz]

You're in luck! Matlab's documentation contains a page that specifically explains the process of sharing variables between apps.

Although that page comprehensively explains the process, here's an answer that shows a step-by-step process of declaring app properties. You can use "public" properties.

[Joseph Kutteh]

thank you!

[Joseph Kutteh]

%my first app called GUI2.mlapp
properties(Access = public)
    name  = ' '; 
  

%my second app called GUI4.mlapp
function startupFcn(app)
    app2handle = GUI2
    app2handle.name
end

in the code of my first app (GUI2) i edit the value of the variable "name", then i click a button which opens the GUI4 app. The value i see that is printed in the command window is ' '. Any idea as to why this happens even though i change the value of "name" before i run the GUI4 app?

Thank you

Joe

[Adam Danz]

It looks like you're opening GUI2 from within GUI2. I don't see any reference to GUI4.

[Joseph Kutteh]

should i have this?

%my first app called GUI2.mlapp
properties(Access = public)
    name  = ' '; 
  
%my second app called GUI4.mlapp
function startupFcn(app)
    app2handle = GUI4 % changed this line
    app2handle.name
end

[Adam Danz]

If you're calliing GUI4 within GUI2 and want to return the name property of GUI4, then yes.

[Joseph Kutteh]

i want to access the updated value of "name" in GUI4. "name" gets changed in GUI2 via a text field.

[Adam Danz]

The line below with the leftward arrow is accessing the name propery of GUI2!

If this function is within GUI4, then use app.name since the app content pertains to GUI4.

%my second app called GUI4.mlapp
function startupFcn(app)
    app2handle = GUI2
    app2handle.name  % <------------------------
end