Re: Is the internet avaliable question
Re: Is the internet avaliable question
- Subject: Re: Is the internet avaliable question
- From: Kevin Bracey <email@hidden>
- Date: Mon, 5 Apr 2004 13:44:39 +1200
Hmm, some saying they have no problems with SCNetwork, but I seem to be:
SCNetworkConnection docs have this rider
Note: Currently only PPP services can be controlled
does this mean that
SCNetworkCheckReachabilityByName
will only return
SCError() 4001
Network reachability cannot be determined ( which is what I get using
it )
when on a LAN connected to the internet via a router or BaseStation?
Technote 1145 also contains
Finally, it's worth noting that the techniques discussed below only
work if the modem is directly connected to the computer. If the
computer's connectivity in indirectly run through a modem (for
example, the computer is on a home AirPort network and the AirPort
Base Station connects to the Internet via its modem), there is very
little you can do to avoid nuisance calls.
The Problem:
I have users on LAN (both router and BaseStation) and PPP and some
which switch back and forward, via location. They want to load a web
page from my site. I want to "to avoid nuisance calls"
I would prefer not to ask , "Are you on the internet?" or let the
browser time out if not. I would rather let the user know that this
option is not available without going online, they can then connect to
get it if they wish.
I'm now going in circles;-)
Maybe 2 steps?
First check SCNetworkCheckReachabilityByName for PPP and if that fails
Problems detecting an active internet connecting using
SystemConfiguration
( also see
http://cocoa.mamasam.com/COCOADEV/2003/03/1/58893.php )
- (BOOL)networkConnectionOK
{
BOOL result = NO;
SCNetworkConnectionFlags flags;
// IMPORTANT:
// To work with CodeWarrior you should set the
// "enums are always int" option, which the CWPro8
// Mach-O stationery fails to do.
assert(sizeof(SCNetworkConnectionFlags) == sizeof(int));
if ( SCNetworkCheckReachabilityByName("muratnkonar.com", &flags) )
{
result = !(flags & kSCNetworkFlagsConnectionRequired) && (flags
& kSCNetworkFlagsReachable);
}
return result;
}
then try and force it online with something like
-(IBAction)areWeLive:(id)sender
{
([NSString stringWithContentsOfURL:[NSURL
URLWithString:@"
http://www.apple.com";]]) ? NSLog(@"We are online") :
NSLog(@"We are offline");
}
if still no go then check with the user?
There is also an option mentioned to check the NetworkServices
preferences.xml but that seems even tricker and I'm not sure what to
look for or if it has the limitations outline above?
I'm sure a solution is just around the corner, probably just after I
click send;-) Thanks for all your help and ideas. Such a common
problem.
Cheers Kevin Bracey
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