Problems writing values from edit text box to a txt file

I have inserted some code under the callback function for an edit text box, it runs without any errors but when I inspect the .txt file afterwards it is blank?

endfunction edit2_Callback(hObject, eventdata, handles)
b = get(hObject,'String');

fid = fopen('b.txt');

fprintf(fid, b{:});

fclose(fid);

Originally the code was as shown below, but this gave the error 'Error using fwrite Cannot write value: unsupported class cell', adding the {:} removed this error.

 endfunction edit2_Callback(hObject, eventdata, handles)
  b = get(hObject,'String');

fid = fopen('b.txt');

fprintf(fid, b);

fclose(fid);

I have also tried replacing the {:} with {1}, but this still gives an empty text box?

[Alfie Grace]

Forgot to include the 'wb' in fid = fopen('b.txt', 'wb')

Answer 1

[Star Strider]

You seem to be missing a format descriptor!

See if:

fprintf(fid, '%s\n', b{:});

improves the performance of your code.

[Alfie Grace]

Works perfectly, thank you so much!

[Star Strider]

My pleasure!