MATLAB: OpeningFcn not saving handles

functionguidatahandlesMATLABopeningsave

I call a callback function in my GUIDE GUI in my OpeningFcn, however I notice that it is not saving the value of handles from the callback function.

The callback function changes the handles value and then calls "guidata" and this appears to work in other places where this function is called. Why is it not saving the handles when the function is placed in my OpeningFcn?

function test_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
pushbutton1_Callback(hObject, eventdata, handles) %not updating
guidata(hObject, handles);

Best Answer

This is occurring because in your OpeningFcn, you are calling "guidata" after calling your callback function.

guidata can manage only one variable at any time. Subsequent calls to guidata(object_handle,data) overwrite the previously stored data.

For this reason, your call to "guidata" after your callback function is overwriting the new handles values. Instead, call "guidata" and then call your callback function.

function test_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
pushbutton1_Callback(hObject, eventdata, handles) %call after guidata so not overwritten

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MATLAB: Wait/retrieve data from another GUI

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.

MATLAB: Close prompt dialog box after hitting OK

monkey_matlab - try removing the uiwait and uiresume calls as I don't think that they are needed in this case.

The closereq is unexpected in the edit1_CreateFcn. Doesn't this generate an error message when you try to run your code? If you want to close the GUI when the user presses the OK button, then I would put this command into the pushbutton1_Callback or do

 function pushbutton1_Callback(hObject, eventdata, handles)
 close(handles.figure1);

assuming that figure1 is the name of your figure/GUI.

Best Answer

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MATLAB: Wait/retrieve data from another GUI

MATLAB: Close prompt dialog box after hitting OK

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