my editbox does not update to '*' when I type my login password, the same code run in matlab 2015a mask my password to '*' but not in 2019a

function Password_KeyPressFcn(hObject, eventdata, handles)

global pass;

pass = get(handles.Password,'UserData');

v = double(get(handles.figure1,'CurrentCharacter'));

if v == 8

pass = pass(1:end-1);

set(handles.Password,'string',pass)

elseif any(v == 65:90) || any(v == 97:122) || any(v == 48:57)

pass = [pass char(v)];

else

msgbox({'Invalid Password Character';'Can''t use Special Character'},'warn','modal')

return

end

set(handles.Password,'UserData',pass);

set(handles.Password,'String',char('*'*sign(pass)));

Answer 1

[Rahul]

Hi @Zeshan Ali,

I understand that you wish to implement the Password functionality to an Edit Field in GUIDE.

According to my understand in MATLAB 2019a the 'KeyPressFcn' does not work similarly to the previous versions. Hence you can make use of the 'evenData.key' and 'eventData.Character' to obtain the key pressed and the character typed in the Edit Field.

Here is an example of some changes:

function Password_KeyPressFcn(hObject, eventdata, handles)

    persistent pass
    if isempty(pass)
        pass = '';
    end

    % Handle Backspace
    if strcmp(eventdata.Key, 'backspace')
        if ~isempty(pass)
            pass = pass(1:end-1);
        end
    % Handle regular characters (letters and numbers)
    elseif ~isempty(eventdata.Character) && ...
           (ismember(eventdata.Character, ['a':'z', 'A':'Z', '0':'9']))
        pass = [pass eventdata.Character];
    else
        msgbox({'Invalid Password Character';'Can''t use Special Character'},'warn','modal')
        return;
    end

    % Store and mask
    set(handles.Password, 'UserData', pass);
    set(handles.Password, 'String', repmat('*', 1, numel(pass)));
end

The following MATLAB Answer can also be referred:

https://www.mathworks.com/matlabcentral/answers/15938-gui-password?s_tid=answers_rc1-2_p2_MLT

The following MathWorks documentations can be referred to know more:

'event.EventData': https://www.mathworks.com/help/matlab/ref/event.eventdata-class.html

Thanks.