save variable from callback function of GUI

I'm trying to build a simple gui for my program, now i have to save the user input, but i can't retrieve data from callback function.

h.d = figure('Position',[300 300 400 200],'Name','Elaborazione di Mesh poligonali'); % position = [ x y xDim yDim ]

h.txt1 = uicontrol('Parent',h.d,...
           'Style','text',...
           'Position',[20 150 120 20],...
           'String','Inserisci nome:');

h.txtBox1 = uicontrol('Parent',h.d,...
           'Style','edit',...
           'Position',[140 150 50 20],...
           'String','Esempio',...
           'Callback',@store_img);

h.btnOk = uicontrol('Parent',h.d,...
           'Style','pushbutton',...
           'Position',[85 20 70 25],...
           'String','Avanti',...
           'Callback',@btn_ok);

uiwait;
disp(h.txtBox1.UserData)

% Salvataggio input dell'utente
function store_img(hObject, event)
 % hObject    handle to pushbutton1 (see GCBO)
 % event  reserved - to be defined in a future version of MATLAB
    data = hObject.String;    
    hObject.UserData = data;
end

function btn_ok( hObject, event)
    close(gcf);
end

Command Window:
Invalid or deleted object.

Error in prova (line 20)
disp(h.txtBox1.UserData)

Answer 1

[Murugan C]

Hi Fabio Righetti ,

I think, we can get the vaiable using global variable. so we first decalre a gloabal varible ,here "data" is decared as lobal .

try this code.

function simple_gui

global data; % declare global varibale

h.d = figure('Position',[300 300 400 200],'Name','Elaborazione di Mesh poligonali'); % position = [ x y xDim yDim ]

h.txt1 = uicontrol('Parent',h.d,...

'Style','text',...

'Position',[20 150 120 20],...

'String','Inserisci nome:');

h.txtBox1 = uicontrol('Parent',h.d,...

'Style','edit',...

'Position',[140 150 50 20],...

'String','Esempio',...

'Callback',@store_img);

h.btnOk = uicontrol('Parent',h.d,...

'Style','pushbutton',...

'Position',[85 20 70 25],...

'String','Avanti',...

'Callback',@btn_ok);

uiwait(gcf);

disp(data)

end

% Salvataggio input dell'utente

function store_img(hObject, event)

% hObject handle to pushbutton1 (see GCBO)

% event reserved - to be defined in a future version of MATLAB

global data

data = get(hObject,'String');

set(hObject,'UserData', data)

end

function btn_ok( hObject, event)

close(gcf);

end