Re: NSNetService, IP address and port number

FROM : Chris Parker
DATE : Thu Jan 16 23:25:55 2003

Hi there -

On Thursday, January 16, 2003, at 1:16 PM, kubernan wrote:

> I want to use RendezVous and i try to catch
> IP address and port number inside this method :
>
> - (void) netServiceBrowser: (NSNetServiceBrowser *) aNetServiceBrowser
> didFindService: (NSNetService *) aNetService moreComing: (BOOL)
> moreComing
>
> I think i have to use something like [aNetService adresses] and read
> the returned array,
> but i don't know how to use the NSData item of the array with the
> sockaddr structure
> for reading the ip address and port number.
>
> Can you help me ?


The example code in /Developer/Examples/PictureSharingBrowser is likely
to be helpful. You need to resolve the received NSNetService. Once it
has resolved, you can ask it for its addresses - or, since you know
that it's resolved successfully grab the first address in the list:

  NSData * address = [[someNetServiceInstance addresses]
objectAtIndex:0];

The docs say that each element of the array returned by -[NSNetService
addresses] is a struct sockaddr_in suitable for use with the socket
APIs:

  struct sockaddr_in *socketAddress = (struct sockaddr_in *)[address
bytes];

The rest of the code demonstrates a way to get the IPv4 address out of
this. The port is available from socketAddress->sin_port.

Note that the PictureSharing (server-side) example has a crashing bug -
comment out line 169 in PicSharingController.m (yes, there's a new
version of this forthcoming).

.chris
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