[Ash.]

Im not too sure how you would do this, because ive never tried, but from experiences with format(..) i would try;

pawn Код:

public OnPlayerConnect(playerid)
{
        //Remeber you need to do SetPlayerColour before GetPlayerColour can be used.
    new string[128], pName[24], colour[30];
    format(colour, sizeof(colour), "%x", GetPlayerColor(playerid));
    strdel(colour, 4, strlen(colour));
    GetPlayerName(playerid, pName, 24);
    format(string, sizeof(string), "{%x}%s {FFFFFF} has joined SERVER NAME", colour, pName);
    SendClientMessageToAll(0xFFFFFFFF, string);
    return 1;
}

Just give it a try, to be honest i doubt it will work because ive never tried passing hexadecimal in a string before.