GUI adding elements in listbox

Hello there. I m trying to create a gui. I firstly design it via guide command. I ve designed a list box and I was wandering how it is possible to add new elements in this listbox.

Answer 1

[Matt Fig]

This is from my collection of GUIs for learning on the FEX.

function [] = GUI_2()
% Demonstrate how to add a new entry to a uicontrol string.  
% Creates a listbox with some strings in it, an editbox and a pushbutton.  
% User types some text into the editbox, then pushes the pushbutton.  The 
% user's text will be added to the top of the listbox.
% 
% Suggested exercise:  Modify the code so that hitting return after a 
% string is typed performs the same task as pushing the pushbutton.
%
%
% Author:  Matt Fig
% Date:  7/15/2009

S.fh = figure('units','pixels',...
              'position',[500 500 200 300],...
              'menubar','none',...
              'name','GUI_2',...
              'numbertitle','off',...
              'resize','off');

S.ls = uicontrol('style','list',...
                 'unit','pix',...
                 'position',[10 110 180 180],...
                 'min',0,'max',2,...
                 'fontsize',14,...
                 'string',{'one';'two';'three';'four'});         
S.ed = uicontrol('style','edit',...
                 'unit','pix',...
                 'position',[10 60 180 30],...
                 'fontsize',14,...
                 'string','New String');
S.pb = uicontrol('style','push',...
                 'units','pix',...
                 'position',[10 10 180 40],...
                 'fontsize',14,...
                 'string','Add String',...
                 'callback',{@ed_call,S});

function [] = ed_call(varargin)
% Callback for pushbutton, adds new string from edit box.
S = varargin{3};  % Get the structure.
oldstr = get(S.ls,'string'); % The string as it is now.
addstr = {get(S.ed,'string')}; % The string to add to the stack.
% The order of the args to cat puts the new string either on top or bottom.
set(S.ls,'str',{addstr{:},oldstr{:}});  % Put the new string on top -OR-
% set(S.ls,'str',{oldstr{:},addstr{:}});  % Put the new string on bottom.

[Azzi Abdelmalek]

[Kris commented]

Ok what I looking for was easy i found it. My problem is that I using the code that was generated from guide. I ve created a textbox and a button and I want to parse the string from textbox to button

% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
  set(hObject,'BackgroundColor','white');
end
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
h1 = findobj('edit1', 'textbox1')
v1=get(h1,'String');
% input = get(hObject,'String');
disp(v1)

What can I do to parse the string without problems?

[Azzi Abdelmalek]

[Kris commented]

Actually im trying this to parse a string from edit box to button so as to open a specific image.

function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
h=findobj('Tag','edit1');
input =  get(h,'String');
input1 = strcat(input{1, 1}, '.jpg');
disp(input1);
I=imread( strcat(input{1, 1}, '.jpg'));

disp returns the real name of the picture but in imread i ve got this problem

   Conversion to logical from cell is not possible.

Error in ==> imread at 342 if (strfind(filename, '://'))

Error in ==> untitled>pushbutton1_Callback at 85 I=imread( strcat(input{1, 1}, '.jpg'));

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> untitled at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)untitled('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

[Azzi Abdelmalek]

[Kris commented]

I got. I had to convert cell inpu to string with function char. Now works. I want to ask sth else. In the same button i ve a command to imshow(it shows me a specific image in the background) a specific image but i want to imshow the image in a new window. What can I do?