[Calisthenics]

The syntax is integer, string..

pawn Код:

CMD:me(playerid, params[])

+ use isnull macro, not sscanf. First code (commented out) is good. Just change string to 145 as max client message can be up to 144 characters.

EDIT: Why SendClientMessageToAll? You want to send only to player who executes command. Change to SendClientMessage.