Setting handles from one GUI to another GUI - Matlab - matlab

Question

I am new to Matlab, excuse my amateur coding. I am trying to pass handles from one GUI to another GUI which are two independent GUI's.
for example, I created two GUI's test1.m and test2.m, in which test2.m calls test1.m in the opening function. so here I am trying to set the text on the test1.m using its handles. But I get an error Reference to non-existent field test1_text. I have even tried sending the handles of test2.m to test1.m by doing test1(handles) in the opening function but still I get the same error.
test2.m sets the text in the second GUI:
function varargout = test2(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', #test2_OpeningFcn, ...
'gui_OutputFcn', #test2_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
function test2_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
test1
guidata(hObject, handles);
function varargout = test2_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;
function test2_button_Callback(hObject, eventdata, handles)
str = sprintf('hello');
set(handles.test1_text,'String',str);
test1.m
function varargout = test1(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', #test1_OpeningFcn, ...
'gui_OutputFcn', #test1_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
function test1_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
function varargout = test1_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;
note that The GUI was developed in Matlab GUIDE.
can anyone advice me on how to do that?

Answer 1

Use GUIDE's Inspector to set Tag to your test1, i.e my_test_1.
In your test2, find the object with such Tag before use it:
function test2_button_Callback(hObject, eventdata, handles)
obj = findall(0, 'Type', 'figure', 'Tag', 'my_test_1');
my_text = findobj(obj, 'Tag', 'test1_text');
str = sprintf('hello');
set(my_text,'String',str);
By the way, you must assure that your test1 has an object named test1_text.