[=WoR=Varth]

pawn Код:

OnSomeWhereYouWantIt(playerid,blahblahblah)
dini_Set(file,"IP",GetPlaeyrIP2(playerid));

GetPlayerIP2(playerid)
{
    new IP[24];
    GetPlayerIp(playerid,IP,24);
    return IP;
}

Like this.
EDIT: Also don't put it in OnPlayerDisconnect