How do I pass variables from one GUI to another

Hey,

I'm still struggling passing variables from one GUI to another by using handles.

I have created a GUI called "main" including a push button "OK" and an edit text box "a". Using "OK" will open a secong GUI "main2" which is supposed to return a variable "e".

function OK_Callback(hObject, eventdata, handles)
uiwait(main2); %Open main2 
e = handles.e;
set(handles.a,'string',e); 
end

In "main2" I have a variable "e" being calculated in a function "calculate" which is being called after typing a number into the edit text box taged "d". By debugging I found out that "Calculate" returns the correct value. All cool so far.

function e = calculate(c,d)
e = c + d;
end 

function d_Callback(hObject, eventdata, handles)
c = str2double(get(handles.c,'string'));
d = str2double(get(handles.d,'string'));
handles.e = e; % All cool until here!
set(handles.e,'string',e);
guidata(hObject,handles); % Update handles structure
uiresume; % back to main
end

What I'm struggling with is: How do I get "e" (or its handle) from "main2" into "main"? Also set(handles.e,'string',e) is not working.

Anybody knows what's going on here?

Thank heaps for any help!

[Robert]

Can you put some pictures with this app, please? Thank you!

Answer 1

[Jonathan LeSage]

You can use the setappdata and getappdata functions to pass values between UIs that you've developed. Since you're passing values between UIs, you want to store the values in the root so all other UIs can access them.

For example, after computing "e" in your main2 UI, you can store the value to the root:

setappdata(0,'evalue',e);

By specifying a UI object handle of "0", we are telling MATLAB to store this value in the root directory. To access this value in your other UI, simple use the getappdata function:

e = getappdata(0,'evalue');

Hope this help to get you started!

[Gerrit]

It works! Thanks a lot, Jonathan! This seems so much easier than using handles. I'm wondering about advantages using handles, though?!

[Gerrit]

The ideas of both, setappdata/getappdata and handles, seem quite similar - if not the same - to me as in storing the value in a directory or structure and get it back from there when you need it in a different GUI.

[KABMNZ KABMNZ]

thanks a lot

[VYSHAKH V NAIR]

thanku

[Khine zar]

thank you ! your answer is so helpful for me !

[Ratsimandresy Dina]

Could anyone tell me what are the possible values of the "UI object handle", please? and its respective description? I set it to "0" (as you said here) in my code and it didn't work. I don't know why. Thank you so much

[Wubie Engdew]

write this code in UI one

 setappdata(0,'name_of_variable_in_UI_One',e);

and this code in another UI

getappdata(0,'write this code in another UI ',e);

[Jingyang Xie]

Thank you Jonathan!

Answer 2

[Image Analyst]

See the latter part of this FAQ entry: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F