passing data between gui

hello, i need your help please,, i just tried on making 2 gui, i have a problem from main gui (the calculate) to sub gui (the result)

Gui_1 (main gui)

a=str2num(get(handles.edit1,'string'));
b=str2num(get(handles.edit2,'string'));
ans=a+b;
setappdata(0,'test_1',ans);

test_3 %calling the subgui (gui2)

Gui_2 (subgui)

b=getappdata(0,'test_3');
set(handles.edit1,'string',b);

                                 string: 4
                                 test_1: 1
                                 test_3: 2

but the result didn't show in the panel edit1.. which part that i did wrong? thank u

[Adam]

It's not obvious from your formatting where

test_3

fits in, but you seem to be setting 'test_1' in appdata and then retrieving 'test_3' from appdata which you don't appear to have set anywhere.

[Adam]

If you want a more complicated method to do this, but one which keeps each GUI's data properly encapsulated within the GUI and has each GUI respond to events in an underlying object rather then the method I use is mostly described in

https://uk.mathworks.com/matlabcentral/answers/315054-how-to-transfer-data-from-one-gui-to-a-uitable-of-another-gui

There are always improvements that can be made, but the idea is that GUIs should not be talking directly to each other or fishing out each other's data, they should each simply be responding to and updating some other object which encapsulates the relevant data.

A GUI should simply be a window onto a program from which you trigger events or functions and update underlying parameters. It should do and store as little as possible itself, simply pass a parameter down to another object and, where required, listen for events from that object to update itself accordingly.

Answer 1

[Jan]

1. Do not use "ans" as a variable. It is overwritten automatically by any uncaught output of a Matlab function.
2. Global variables are a bad programming pattern. The ApplicationData of the Root object are global data. (search for "global variable" to find thousands of corresponding discussions in the net)
3. Solution:

Use the handles of the other GUI to share data. E.g.:

function CreateGUI1
handles.FigH = figure('Tag', 'GUI1');
handles.Data  = 19;
guidata(handles.FigH, handles);
end

function CreateGUI2
handles.FigH = figure('Tag', 'GUI2');
handles.ButtonH = uicontrol('Style', 'PushButton', 'Callback', @ButtonCB);
guidata(handles.FigH, handles);
end

function ButtonCB(ButtonH, EventData)
GUI1H = findobj(allchild(groot), 'flat', 'Tag', 'GUI1');
handlesGUI1 = guidata(GUI1H);
data        = handelsGUI.Data;
set(ButtonH, 'String', sprintf('%g', data));
end

This shows how to use the tag of a GUI to find its handle. Then the contents of the handles struct of the other figure can be used to access its data.

Search in the forum for "share data between callbacks", whereby the callback can even belong to different figures.

[Joe Sitinjak]

okay brother, thanks for the advice and the answer. let me try that..

[Le Dung]

I use your code, matlab return:

H must be the handle to a figure or figure descendent.

[Jan]

@Le Duong: Please post your code and the complete error message. The error message is clear: You provide a variable "H", which is not a graphics handle. But without seeing the code, I cannot guess, what it is instead.