Post by rayancaleb on Feb 15, 2018 2:28:19 GMT -5
Hi,
They are regular ascii characters, just not a printing character or maybe not a character that can be printed in the font used by the software. Most font sets display non-printing characters as a hollow rectangle like that. Well-behaved software doesn't accept non-printing characters in entry fields (like for a screen name) but some don't validate everything that they should. ASCII 0-31 should always be blocked, and I suspect they always are. It's more likely what you have seen are extended ascii characters (128-256) and not control characters, and the software font doesn't support everything in the extended set. But there isn't anything wrong with allowing those, as long as they use a software font that can display them.
For more details
Software Promo Video
They are regular ascii characters, just not a printing character or maybe not a character that can be printed in the font used by the software. Most font sets display non-printing characters as a hollow rectangle like that. Well-behaved software doesn't accept non-printing characters in entry fields (like for a screen name) but some don't validate everything that they should. ASCII 0-31 should always be blocked, and I suspect they always are. It's more likely what you have seen are extended ascii characters (128-256) and not control characters, and the software font doesn't support everything in the extended set. But there isn't anything wrong with allowing those, as long as they use a software font that can display them.
For more details
Software Promo Video