GUI edit box with the desktop path MAC

Hello, I am trying to set the box with the desktop path in Mac I get the user name using

if true
  user_name = java.lang.System.getProperty('user.name');
set(handles.edit1,'String',['/Users/',user_name,'/Desktop']);
end

This is working in windows pc but not in mac. I receive The following error occurred converting from char to opaque: Undefined function 'opaque' for input arguments of type 'char'.

Any idea why it is not working?

Answer 1

[Geoff Hayes]

Erdem - look closely at the data type for user_name

 user_name = java.lang.System.getProperty('user.name');
 class(user_name)

 ans =
    java.lang.String

user_name is not a MATLAB character (char) array but is a string object instead. You need to convert this to a MATLAB character array using char as

 user_name = char(java.lang.System.getProperty('user.name'));
 set(handles.edit1,'String',['/Users/',user_name,'/Desktop']);

Try the above and see what happens!

[Kamuran]

Thanks . you are right. I will try that.

Answer 2

[Walter Roberson]

Why are you not using

set(handles.edit1, 'String' fullfile(getenv('HOME'), 'Desktop'))

[Kamuran]

simply because I didn't know that :)