Passing objects from app designer to the workspace

Hello , I'm using app designer and I am creating object when some button clicked, (in the callback function) i'm trying to use the object that created in the callback funcion in the workspace. I know that i can create some "global" object in the properties and then use app.obj. There is other way that i can pass the object from the callbackfunction to the workspace? or the only way is to use the properties.

Thank you very much :)

Answer 1

[Allen]

Though I would recommend using one of @Adam Danz's solutions since they are typically a safer method of passing data, assignin can be used to programmatically assign a variable to the workspace.

See the following help page for details on how to use the assignin function.

https://www.mathworks.com/help/matlab/ref/assignin.html

[Ron]

Thank you very much exactly what i were looking for !

Can you understand why @Adam Danz solution better? i mean why you are saying his solution is in safer method

[Adam Danz]

See the documentation link that Allen provided, specifically this section:

https://www.mathworks.com/help/matlab/ref/assignin.html#d124e54930

Here's are other threads from another experienced contributor on this topic:

• https://www.mathworks.com/matlabcentral/answers/225148-using-assignin-or-evalin-command-to-populate-structure-elements-with-numeric-data#comment_294425
• https://www.mathworks.com/matlabcentral/answers/364851-assignin-and-eval-functions#answer_289205

[Ron]

Hey again !

Well, i understand that assignin isn't good way to use for my solution , but there is any another way that the "button callback function" can return a value? I am trying to use obj in some matlab file after click button pushed but my variable doesn't pass to the workspace( because after button pushed the functions ends and the)

There is any way to change that when button pushed i can return value?

[Allen]

Ron,

How have you setup your application? For example, are you using GUIDE, AppDesigner, or have you created a UIFigure with additional UI Objects such as the push-button? Also, could you provide any relavent code for your push-button callback function identifying the variable that you are wanting to replicate within the workspace? This will help others to provide more meaningful solutions to your questions.

[Ron]

I am using appDesigner,

Function RunButtonPushed(app,event) //NOTE : this is on gray cant add a return value

obj=importdata(somepath) //NOTE : The path is matlab data that have run method

obj.run() // NOTE : after the run , nothing happens because the variable

end obj is uknown in the workspace i guess beacuse in the

end of this function there is END

Answer 2

[Adam Danz]

The best way to access the object created by an app is to store the handle to the object as a public property of the app and to access that handle through the app object, stored as a variable in your workspace.

More info

• 3 Ways to access your app handle
• Declaring a private/public property in an app

[Ron]

Thank you very much !