[Virtual1ty]

So... you want to check if a string is empty? Use isnull. I'm sure sscanf must have inbuilt isnull checking.

Edit: check at this, might help you:

pawn Код:

CMD:car(playerid,params[]) {
    if(AccountInfo[playerid][aAdminLevel] >= 1) {
      new tmp[128], tmp2[128], tmp3[128], Index; tmp = strtok(params,Index), tmp2 = strtok(params,Index); tmp3 = strtok(params,Index);
      if(isnull(tmp)) return SendClientMessage(playerid, red, "USAGE: /car [Modelid/Name] [colour1] [colour2]");
        new car, colour1, colour2, sendername[MAX_PLAYER_NAME];
        if(!IsNumeric(tmp)) car = GetVehicleModelIDFromName(tmp); else car = strval(tmp);
        if(car < 400 || car > 611) return SendClientMessage(playerid, red, "ERROR: Invalid Vehicle Model");
        if(isnull(tmp2)) colour1 = random(126); else colour1 = strval(tmp2);
        if(isnull(tmp3)) colour2 = random(126); else colour2 = strval(tmp3);
        new LVehicleID,Float:X,Float:Y,Float:Z, Float:Angle,int1; GetPlayerPos(playerid, X,Y,Z); GetPlayerFacingAngle(playerid,Angle); int1 = GetPlayerInterior(playerid);
        LVehicleID = CreateVehicle(car, X+3,Y,Z, Angle, colour1, colour2, -1); LinkVehicleToInterior(LVehicleID,int1);
        CreatedCars[CreatedCar] = LVehicleID;
        CreatedCar ++;
        GetPlayerName(playerid, sendername, sizeof(sendername));
        //format(string, sizeof(string), "%s spawned a \"%s\" (Model:%d) colour (%d, %d), at %0.2f, %0.2f, %0.2f", sendername, VehNames[car-400], car, colour1, colour2, X, Y, Z);
        format(string, sizeof(string), "You have spawned a \"%s\" (Model:%d) colour (%d, %d)", VehNames[car-400], car, colour1, colour2);
        PutPlayerInVehicle(playerid, LVehicleID, 0);
        return SendClientMessageToAdmins(ADMIN_RED, string, 1);
    }
    return 1;
}

Edit2: I'm off, good night all, @_❼_ : hope it helped you.