Re: NSNetServiceBrowser when a search finds nothing
Re: NSNetServiceBrowser when a search finds nothing
- Subject: Re: NSNetServiceBrowser when a search finds nothing
- From: Jeff Kelley <email@hidden>
- Date: Thu, 16 Nov 2017 15:42:23 -0500
IIRC, the “moreComing” parameter is basically “more coming right now”; it’s a
sign to you that you shouldn’t update your UI yet because there’s going to be
another call immediately after this one.
Jeff Kelley
email@hidden | @SlaunchaMan <https://twitter.com/SlaunchaMan> |
jeffkelley.org <http://jeffkelley.org/>
> On Nov 16, 2017, at 3:38 PM, James Walker <email@hidden> wrote:
>
> On 11/16/2017 10:58 AM, Josh Graessley wrote:
>> The search is never finished until you decide it is by cancelling the browse.
>>
>> Bonjour sends multicasts queries with an exponential backoff, up to some
>> maximum amount of time. When a Bonjour service is advertised/registered on
>> an interface, a multicast is sent out as well. As long as you have that
>> browser open, Bonjour will keep watching for a matching service to appear,
>> either as a response to one of the multicasts it sends or through an
>> announcement sent by a device arriving on the networking or starting the
>> service.
>>
>> The only alternative is a timeout and timeouts are bad.
>
> Maybe I didn't make it clear enough what I'm looking for. If the delegate
> receives a netServiceBrowser:didFindService:moreComing: message with NO for
> the moreComing parameter, that means *something*, right? Sure, there could
> be unusual circumstances causing delayed notification about some service, and
> more services could come online later, but I probably have the whole story
> for now. That's the kind of "that's probably it for now" information I'd
> like to have in the case where there are no services.
>
>> On Nov 16, 2017, at 10:36 AM, James Walker <email@hidden>
>> <mailto:email@hidden> wrote:
>>>
>>> If I use -[NSNetServiceBrowser searchForServicesOfType:inDomain:] and there
>>> happen to be no services of the specified type, my delegate gets
>>> netServiceBrowserWillSearch:, but nothing else. How can I know when the
>>> search is finished?
>>>
>
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