How to use the zeroconf.DNSPointer function in zeroconf

record.alias == info.name):
                    if info.name.find('.') < 0:
                        info.name = '%s.[%s:%s].%s' % (info.name,
                            info.address, info.port, info.type)

                        self.checkService(info)
                        return
                    raise NonUniqueNameException
            if now < nextTime:
                self.wait(nextTime - now)
                now = currentTimeMillis()
                continue
            out = DNSOutgoing(_FLAGS_QR_QUERY | _FLAGS_AA)
            self.debug = out
            out.addQuestion(DNSQuestion(info.type, _TYPE_PTR, _CLASS_IN))
            out.addAuthorativeAnswer(DNSPointer(info.type, _TYPE_PTR,
                                                _CLASS_IN, _DNS_TTL, info.name))
            self.send(out)
            i += 1
            nextTime += _CHECK_TIME

if self.servicetypes[info.type]>1:
                self.servicetypes[info.type]-=1
            else:
                del self.servicetypes[info.type]
        except:
            pass
        now = currentTimeMillis()
        nextTime = now
        i = 0
        while i < 3:
            if now < nextTime:
                self.wait(nextTime - now)
                now = currentTimeMillis()
                continue
            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
            out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR, 
                _CLASS_IN, 0, info.name), 0)
            out.addAnswerAtTime(DNSService(info.name, _TYPE_SRV, 
                _CLASS_IN, 0, info.priority, info.weight, info.port, 
                info.name), 0)
            out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT, _CLASS_IN, 
                0, info.text), 0)
            if info.address:
                out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A, 
                    _CLASS_IN, 0, info.address), 0)
            self.send(out)
            i += 1
            nextTime += _UNREGISTER_TIME

def unregisterAllServices(self):
        """Unregister all registered services."""
        if len(self.services) > 0:
            now = currentTimeMillis()
            nextTime = now
            i = 0
            while i < 3:
                if now < nextTime:
                    self.wait(nextTime - now)
                    now = currentTimeMillis()
                    continue
                out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
                for info in self.services.values():
                    out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR, 
                        _CLASS_IN, 0, info.name), 0)
                    out.addAnswerAtTime(DNSService(info.name, _TYPE_SRV, 
                        _CLASS_IN, 0, info.priority, info.weight, 
                        info.port, info.server), 0)
                    out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT, 
                        _CLASS_IN, 0, info.text), 0)
                    if info.address:
                        out.addAnswerAtTime(DNSAddress(info.server, 
                            _TYPE_A, _CLASS_IN, 0, info.address), 0)
                self.send(out)
                i += 1
                nextTime += _UNREGISTER_TIME

if self.servicetypes[info.type] > 1:
                self.servicetypes[info.type] -= 1
            else:
                del self.servicetypes[info.type]
        except:
            pass
        now = currentTimeMillis()
        nextTime = now
        i = 0
        while i < 3:
            if now < nextTime:
                self.wait(nextTime - now)
                now = currentTimeMillis()
                continue
            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
            out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR,
                _CLASS_IN, 0, info.name), 0)
            out.addAnswerAtTime(DNSService(info.name, _TYPE_SRV,
                _CLASS_IN, 0, info.priority, info.weight, info.port,
                info.name), 0)
            out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT, _CLASS_IN,
                0, info.text), 0)
            if info.address:
                out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A,
                    _CLASS_IN, 0, info.address), 0)
            self.send(out)
            i += 1
            nextTime += _UNREGISTER_TIME

record.alias == info.name):
                    if info.name.find('.') < 0:
                        info.name = '%s.[%s:%s].%s' % (info.name,
                            info.address, info.port, info.type)

                        self.checkService(info)
                        return
                    raise NonUniqueNameException
            if now < nextTime:
                self.wait(nextTime - now)
                now = currentTimeMillis()
                continue
            out = DNSOutgoing(_FLAGS_QR_QUERY | _FLAGS_AA)
            self.debug = out
            out.addQuestion(DNSQuestion(info.type, _TYPE_PTR, _CLASS_IN))
            out.addAuthorativeAnswer(DNSPointer(info.type, _TYPE_PTR,
                                                _CLASS_IN, _DNS_TTL, info.name))
            self.send(out)
            i += 1
            nextTime += _CHECK_TIME

def readOthers(self):
        """Reads the answers, authorities and additionals section of the
        packet"""
        n = self.numAnswers + self.numAuthorities + self.numAdditionals
        for i in xrange(n):
            domain = self.readName()
            type, clazz, ttl, length = self.unpack('!HHiH')

            rec = None
            if type == _TYPE_A:
                rec = DNSAddress(domain, type, clazz, ttl, self.readString(4))
            elif type == _TYPE_CNAME or type == _TYPE_PTR:
                rec = DNSPointer(domain, type, clazz, ttl, self.readName())
            elif type == _TYPE_TXT:
                rec = DNSText(domain, type, clazz, ttl, self.readString(length))
            elif type == _TYPE_SRV:
                rec = DNSService(domain, type, clazz, ttl,
                    self.readUnsignedShort(), self.readUnsignedShort(),
                    self.readUnsignedShort(), self.readName())
            elif type == _TYPE_HINFO:
                rec = DNSHinfo(domain, type, clazz, ttl,
                    self.readCharacterString(), self.readCharacterString())
            elif type == _TYPE_AAAA:
                rec = DNSAddress(domain, type, clazz, ttl, self.readString(16))
            else:
                # Try to ignore types we don't know about
                # Skip the payload for the resource record so the next
                # records can be parsed correctly
                self.offset += length

for question in msg.questions:
            if question.type == _TYPE_PTR:
                if question.name == "_services._dns-sd._udp.local.":
                    for stype in self.servicetypes.keys():
                        if out is None:
                            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
                        out.addAnswer(msg,
                            DNSPointer("_services._dns-sd._udp.local.",
                                       _TYPE_PTR, _CLASS_IN, _DNS_TTL, stype))
                for service in self.services.values():
                    if question.name == service.type:
                        if out is None:
                            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
                        out.addAnswer(msg,
                            DNSPointer(service.type, _TYPE_PTR,
                                       _CLASS_IN, _DNS_TTL, service.name))
            else:
                try:
                    if out is None:
                        out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)

                    # Answer A record queries for any service addresses we know
                    if question.type in (_TYPE_A, _TYPE_ANY):
                        for service in self.services.values():
                            if service.server == question.name.lower():
                                out.addAnswer(msg, DNSAddress(question.name,
                                    _TYPE_A, _CLASS_IN | _CLASS_UNIQUE,
                                    _DNS_TTL, service.address))

                    service = self.services.get(question.name.lower(), None)
                    if not service: continue

def readOthers(self):
        """Reads the answers, authorities and additionals section of the 
        packet"""
        n = self.numAnswers + self.numAuthorities + self.numAdditionals
        for i in xrange(n):
            domain = self.readName()
            type, clazz, ttl, length = self.unpack('!HHiH')

            rec = None
            if type == _TYPE_A:
                rec = DNSAddress(domain, type, clazz, ttl, self.readString(4))
            elif type == _TYPE_CNAME or type == _TYPE_PTR:
                rec = DNSPointer(domain, type, clazz, ttl, self.readName())
            elif type == _TYPE_TXT:
                rec = DNSText(domain, type, clazz, ttl, self.readString(length))
            elif type == _TYPE_SRV:
                rec = DNSService(domain, type, clazz, ttl,
                    self.readUnsignedShort(), self.readUnsignedShort(),
                    self.readUnsignedShort(), self.readName())
            elif type == _TYPE_HINFO:
                rec = DNSHinfo(domain, type, clazz, ttl,
                    self.readCharacterString(), self.readCharacterString())
            elif type == _TYPE_AAAA:
                rec = DNSAddress(domain, type, clazz, ttl, self.readString(16))
            else:
                # Try to ignore types we don't know about
                # Skip the payload for the resource record so the next
                # records can be parsed correctly
                self.offset += length

def __eq__(self, other):
        """Tests equality on alias"""
        return isinstance(other, DNSPointer) and self.alias == other.alias