How can callbacks from a "Main GUI" access data from the controls of a "User Settings" GUI?

I have read up on ways to share data between callback functions in a GUI. However, what I’ve read seems to apply to sharing data between callbacks from the same GUI. I’m trying to share data between callbacks from two different GUIs. The talked about techniques I’ve come across don’t work in my case.

My overall objective is to provide a "User Settings" GUI as a pop-up that can be activated from my “Main GUI.” I want the “Main GUI” callbacks to be able to access the data on the controls in the “User Settings” GUI after the "User Settings" GUI has been closed by user.

Wondering if what I’m trying to do is possible and how. Thanks in advance for any helpful guidance.

Answer 1

[Paulo Silva]

How to save and restore state of a GUI in MATLAB

User Settings saves the settings like Doug shown and your Main GUI reads the saved data (the mat file).

[.]

Thanks for the answer. Writing the data in one GUI to a file, then reading the data from the file, as shown by Doug, worked. Wondering if this is the only known way to share data between two GUI's (other than global variables). Reason I ask, is that I also need to pass a video file from one GUI to another. If I have to write the video file to disk then read it, this will be slow. Assigning the video array as a global is workable, but not such a clean way to write maintainable code.

[Paulo Silva]

There are many ways to share data between two GUI's

input and output arguments

app_data

tag objects and using findall

UserData property of objects