Re: [Bonjour/Rendezvous] How to resolve a service?
Re: [Bonjour/Rendezvous] How to resolve a service?
- Subject: Re: [Bonjour/Rendezvous] How to resolve a service?
- From: Marc Krochmal <email@hidden>
- Date: Sat, 21 Apr 2007 12:53:18 -0700
Hi Stephane,
In case you never figured this out, you need to retain the
inNetService in your didFindService before resolving it and then stop/
release it when you've finished resolving.
- (void)netServiceBrowser:(NSNetServiceBrowser *)
inNetServiceBrowser didFindService:(NSNetService *) inNetService
moreComing:(BOOL)moreComing
{
[inNetService setDelegate:self];
[inNetService resolveWithTimeout:120.0];
}
Best Regards,
-Marc
On Apr 5, 2007, at 9:16 AM, Stephane wrote:
On Apr 5, 2007, at 5:51 , Nathan Duran wrote:
In such as case, when - [NSNetService resolveWithTimeOut:] is
called,
the resolution starts (confirmed by netServiceWillResolve:) but
returns nothing: neither a success nor a failure.
Well resolveWithTimeout has a void return type, so I wouldn't
expect it to
return anything, and the documentation states that:
"If the resolve succeeds before the timeout period lapses, the
receiver
sends netServiceDidResolveAddress: to the delegate. Otherwise, the
receiver
sends netService:didNotResolve: to the delegate."
If you follow up with the documentation for netServiceWillResolve
which
you're using, you'll find that this message is sent regardless of
whether or
not resolution succeeds:
"Resolution of the service proceeds asynchronously and may still
generate a
call to the delegate’s netService:didNotResolve: method if an
error occurs."
I haven't tried doing the same thing you're trying to do, but I would
strongly recommend Stuart Cheshire's O'Reilly book "Zero
Configuration
Networking" if you're interested in learning the ins and outs of
Bonjour
programming.
I do agree with you since this is already what I'm doing (this is
also why I said it was working in most cases).
Yet the fact remains that while this is working fine for most
services that have the name of the computer set for the name field
(e.g. "_ssh._tcp."), it does not work when dealing with other types
of services that do not set the name of a computer for the name
field (e.g. "_apple-sasl._tcp."). So there must be something
different to do in such cases...
--------8<-------------8<-------------8<-------------8<-------------8<
-------------8<-------------8<-------------
#import "MainController.h"
#include <netinet/in.h>
#include <netdb.h>
@implementation MainController
- (void) awakeFromNib
{
sharedServiceBrowser_=[[NSNetServiceBrowser alloc] init];
if (sharedServiceBrowser_!=nil)
{
[sharedServiceBrowser_ setDelegate:self];
[sharedServiceBrowser_ searchForServicesOfType:@"_apple-
sasl._tcp." inDomain:@""];
}
}
#pragma mark -
- (void) printInformationForService:(NSNetService *) inNetService
{
NSArray * tAddresses;
NSData * tData;
NSLog(@"Domain: %@",[inNetService domain]);
NSLog(@"Type: %@",[inNetService type]);
NSLog(@"Name: %@",[inNetService name]);
NSLog(@"hostName: %@",[inNetService hostName]);
tAddresses=[inNetService addresses];
if (tAddresses!=nil)
{
NSEnumerator * tEnumerator;
tEnumerator=[tAddresses objectEnumerator];
if (tEnumerator!=nil)
{
NSData * tData;
while (tData=[tEnumerator nextObject])
{
struct sockaddr * tSockAddress;
tSockAddress = (struct sockaddr *) [tData bytes];
if (tSockAddress!=nil)
{
unsigned short tDestinationPort;
char tCIPAddress[INET6_ADDRSTRLEN];
if (tSockAddress->sa_family==AF_INET6)
{
struct sockaddr_in6 * to6;
to6=(struct sockaddr_in6 *) tSockAddress;
tDestinationPort=ntohs(to6->sin6_port);
}
else if (tSockAddress->sa_family==AF_INET)
{
struct sockaddr_in * to4;
to4=(struct sockaddr_in *) tSockAddress;
tDestinationPort=ntohs(to4->sin_port);
}
if (getnameinfo(tSockAddress, tSockAddress->sa_len,
tCIPAddress, INET6_ADDRSTRLEN, NULL, 0, NI_NUMERICHOST)==0)
{
NSString * tString;
tString=[NSString stringWithUTF8String:tCIPAddress];
if (tString!=nil)
{
NSLog(@"Address: %@:%hu",tString,tDestinationPort);
}
}
}
}
}
}
tData=[inNetService TXTRecordData];
if (tData!=nil)
{
NSLog(@"TXT Data: %@",[NSNetService
dictionaryFromTXTRecordData:tData]);
}
else
{
NSLog(@"TXT Data: nil");
}
}
- (void) netServiceDidResolveAddress:(NSNetService *) inNetService
{
NSLog(@"success");
[self printInformationForService:inNetService];
}
- (void)netServiceWillResolve:(NSNetService *)sender
{
NSLog(@"start");
}
- (void)netService:(NSNetService *) inNetService didNotResolve:
(NSDictionary *)errorDict
{
NSLog(@"failure");
}
- (void)netServiceBrowser:(NSNetServiceBrowser *)
inNetServiceBrowser didFindService:(NSNetService *) inNetService
moreComing:(BOOL)moreComing
{
[inNetService setDelegate:self];
[inNetService resolveWithTimeout:120.0];
}
- (void)netServiceBrowser:(NSNetServiceBrowser *) inServiceBrowser
didRemoveService:(NSNetService *) inService moreComing:(BOOL)
moreComing
{
}
@end _______________________________________________
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