Re: NSNetServiceBrowser when a search finds nothing
Re: NSNetServiceBrowser when a search finds nothing
- Subject: Re: NSNetServiceBrowser when a search finds nothing
- From: James Walker <email@hidden>
- Date: Thu, 16 Nov 2017 12:38:26 -0800
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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> 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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