MATLAB Creating Graphical User Interfaces

data = guidata(object_handle);

The component you specify to store the data does not need to be the same component

that you use to retrieve it.

If your data is stored as a struct array or cell array, and you want to update one element

without changing the other elements, then retrieve the data and replace it with the

modified array:

data = guidata(hObject);

data.myvalue = 2;

guidata(hObject,data);

Use guidata in Apps Created Programmatically

To use guidata in a programmatic app, store the data with some initial values in the

main function. Then you can retrieve and modify the data in any callback function.

The following code is a simple example of a programmatic app that uses guidata to

share a structure containing two fields. To see how it works, copy and paste this code into

an editor and run it.

function my_slider()

hfig = figure();

guidata(hfig,struct('val',0,'diffMax',1));

slider = uicontrol('Parent', hfig,'Style','slider',...

'Units','normalized',...

'Position',[0.3 0.5 0.4 0.1],...

'Tag','slider1',...

'Callback',@slider_callback);

button = uicontrol('Parent', hfig,'Style','pushbutton',...

'Units','normalized',...

'Position',[0.4 0.3 0.2 0.1],...

'String','Display Values',...

'Callback',@button_callback);

end

function slider_callback(hObject,eventdata)

data = guidata(hObject);

data.val = hObject.Value;

data.diffMax = hObject.Max - data.val;

% For R2014a and earlier:

% data.val = get(hObject,'Value');

11 Manage Application-Defined Data