pushbutton in gui for space bar

I am creating a mouse controlled virtual keyboard using pushbuttons in gui.but cant create callback code for space bar.please help. my code for space bar:

function space_Callback(hObject, eventdata, handles)

% hObject    handle to space (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
  OLDstring=get(handles.text1,'string');
  set(handles.text1,'string',sprintf('%s %s',OLDstring,' '));

this creates space in static text but after i press another keybutton for input...the space is gone and the inputs are displayed without the space.. ..code for other input...example:for entering h:

 function h_Callback(hObject, eventdata, handles)
% hObject    handle to h (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
OLDstring=get(handles.text1,'string');
NEWstring=('h');
textstring=strcat(OLDstring,NEWstring);
set(handles.text1,'string',textstring);

Answer 1

[Geoff Hayes]

Shreyas - according to strcat, for _ character array inputs, strcat removes trailing ASCII white-space characters: space, tab, vertical tab, newline, carriage return, and form feed_. So your space is being removed by this function.

Just use the square brackets for the string concatenation. For example, your callbacks can be simplified to

 function h_Callback(hObject, eventdata, handles)

 str = get(handles.text1,'String');
 set(handles.text1,'String',[str 'h']);

 function space_Callback(hObject, eventdata, handles)

 str = get(handles.text1,'String');
 set(handles.text1,'String',[str ' ']);

Try the above and see what happens!

[Shreyas Kagalkar]

Thank you very much for the answer