How do I get a listbox value using a push button callback?

Hi,

I am coding a simple GUI with some list boxes and push buttons. I want to use the push button callback to read the listbox value, however I can't figure out how to 'read' the listbox value using the push button callback. I understand how to use the pushbutton callback on its own, but not how to link it to the listbox.

My code is below (version R2016b with all toolboxes) - can anyone offer some help?

Thanks!

function my_gui
%%GUI interface
S.fh = figure('units','normalized',...
                    'position',[0.0 0.3 0.5 0.65],...
                    'menubar','none',...
                    'name','my_gui');
S.input_list = uicontrol('style','listbox',...
                    'unit','normalized',...
                    'position',[0.05 0.2 0.35 0.65],...
                    'string',{'A';'B';'C'},...
                    'fontunits','normalized',...
                    'Callback',@input_list_Callback);
S.output_list = uicontrol('style','listbox',...
                    'unit','normalized',...
                    'position',[0.60 0.2 0.35 0.65],...
                    'string',{},...
                    'fontunits','normalized',...
                    'Callback',@output_list_Callback);
S.pb1 = uicontrol('style','push',...
                    'unit','normalized',...
                    'position',[0.44 0.7 0.12 0.1],...
                    'string','Add',...
                    'fontunits','normalized',...
                    'Callback',@pb1_Callback);
S.pb2 = uicontrol('style','push',...
                    'unit','normalized',...
                    'position',[0.44 0.55 0.12 0.1],...
                    'string','Remove',...
                    'fontunits','normalized',...
                    'Callback',@pb2_Callback);

function pb1_Callback(hObject, eventdata, handles)
% hObject    handle to pb1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
display('pb1')

function pb2_Callback(hObject, eventdata, handles)
% hObject    handle to pb2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
display('pb2');

function input_list_Callback(hObject, eventdata, handles)
% hObject    handle to input_list (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
vals=get(hObject,'string')

[voxynn]

Can anyone assist with providing some help without using GUIDE?

Answer 1

[Image Analyst]

Why not simply use GUIDE instead of trying to build all this complicated stuff manually? Then, in the push button callback you'd simply do

listBoxItems = handles.input_list.Strings;
listBoxSelectedIndexes = handles.input_list.Value;
selectedString = listBoxItems{listBoxSelectedIndexes}

[voxynn]

This GUI is a small segment of larger piece, with multiple plots and inputs, eventually with tabs too. Coding allows more flexibility for growth.

[Image Analyst]

Not really, but whatever.

Somehow you need to get your listbox handle into your callback. So see this link http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F