MATLAB: Wait/retrieve data from another GUI

Question

Hi, my program uses a button in the main GUI to popup another GUI for settings. However, I want my main GUI to wait for that GUI to finish (i.e click OK button) and response immediately for the changes made by that GUI. Any idea how I can do that?

Answer 1

Hi,

it is possible to do with small trick.

When passing data between GUIs, the idea is via MAT file.

I have 2 GUIs as shown in picture below :

In the first GUI, button 'Threshold' will execute second GUI.

In second GUI, you should threshold the image by changing the slider position and then click OK.

The thresholded image will appears in axes1 of first GUI.

Just try it. I will not explain more.

You should design the GUIs and here the code :

FIRST GUI

-------------------

function varargout = untitled(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @untitled_OpeningFcn, ...
                   'gui_OutputFcn',  @untitled_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 untitled_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles.I = imread('cameraman.tif');
imshow(handles.I);
guidata(hObject, handles);
function varargout = untitled_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;
function pushbutton1_Callback(hObject, eventdata, handles)
handles.output = hObject;
tempImg = handles.I;
save('temp.mat','tempImg','-append');
uiwait(untitled2);
load('temp.mat');
handles.I = tempbw;
imshow(handles.I);
guidata(hObject, handles);

SECOND GUI

-------------------

function varargout = untitled2(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @untitled2_OpeningFcn, ...
                   'gui_OutputFcn',  @untitled2_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 untitled2_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
load temp.mat
handles.I = tempImg;
handles.bw = handles.I;
imshow(handles.I);
set(handles.slider1,'min',0,'max',1,'sliderstep',[.1 .1]);
guidata(hObject, handles);
function varargout = untitled2_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;
function slider1_Callback(hObject, eventdata, handles)
handles.output = hObject;
thresh = get(handles.slider1,'value');
handles.bw = im2bw(handles.I,thresh);
imshow(handles.bw);
guidata(hObject, handles);
function slider1_CreateFcn(hObject, eventdata, handles)
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end
function pushbutton1_Callback(hObject, eventdata, handles)
handles.output = hObject;
tempbw = handles.bw;
save('temp.mat','tempbw','-append');
close(untitled2);
function pushbutton2_Callback(hObject, eventdata, handles)
close(untitled2);

I hope this clear.