Hi,
thank you for your reply, this is the email from support:
"Hi,

you appended data with zero length. Pass the string length to the size parameter, otherwise nothing is appended. But we'll change this in the next version so that 0 is also accepted for the length, as with file_append. "


file_append with 0 as lenght. works as stated in the manual. file_appendfront does not.


The append_front does not append any character in front of the file with any of the variants. Just run my script and you can check it. Maybe I am not using the right sintax. Can you tell me how to modify the script? I just want to print the window output in the reverse order.

I guess that n was enough as in normal printf. I will update my string accordingly with your suggestion.

Thank you in advance