Re: Problems detecting an active internet connecting using SystemConfiguration
Re: Problems detecting an active internet connecting using SystemConfiguration
- Subject: Re: Problems detecting an active internet connecting using SystemConfiguration
- From: Alex <email@hidden>
- Date: Sat, 15 Mar 2003 11:47:47 -0800
If all you want to know is if you are online or not I think this is
easier:
-(IBAction)areWeLive:(id)sender
{
([NSString stringWithContentsOfURL:[NSURL
URLWithString:@"
http://www.apple.com";]]) ? NSLog(@"We are
online"):NSLog(@"We are offline");
}
Am Samstag, 15.03.03, um 10:37 Uhr (US/Pacific) schrieb David Sinclair:
>
Von: David Sinclair <email@hidden>
>
Datum: Sa, 15. Mrz 2003 10:37:28 US/Pacific
>
An: Marc Weil <email@hidden>
>
Cc: Cocoa Digest <email@hidden>
>
Betreff: Re: Problems detecting an active internet connecting using
>
SystemConfiguration
>
>
On Saturday, Mar 15, 2003, at 05:40 US/Pacific, Marc Weil wrote:
>
>
> I have been trying to use SCNetwork.h's
>
> SCNetworkCheckReachabilityByName()
>
> function for detecting an active internet connection, but it doesn't
>
> seem to
>
> work right. It only worked correctly once (unless I am misreading
>
> what its
>
> constants mean).
>
>
It took some experiments for me to figure out a good combination that
>
seems to work in all tested cases -- DSL, AirPort, dial-up, waking
>
from sleep, etc.
>
>
Here are some values I've encountered:
>
>
Ethernet DSL unplugged: 0 = 00000000 = all off
>
Ethernet DSL online: 2 = 00000010 = kSCNetworkFlagsReachable on
>
AirPort waking (offline): 7 = 00000111 =
>
kSCNetworkFlagsTransientConnection &
>
kSCNetworkFlagsReachable &
>
kSCNetworkFlagsConnectionRequired
>
Dialup online: 11 = 00001011 =
>
kSCNetworkFlagsTransientConnection &
>
kSCNetworkFlagsReachable &
>
kSCNetworkFlagsConnectionAutomatic
>
>
Here's the method I use in my Dejal Simon product, that seems to cover
>
all cases. I check two sites just in case the first one is
>
unavailable for some reason:
>
>
- (BOOL)internetOnline
>
{
>
Boolean success;
>
BOOL okay;
>
SCNetworkConnectionFlags status;
>
>
success = SCNetworkCheckReachabilityByName("www.apple.com",
>
&status);
>
>
okay = success && (status & kSCNetworkFlagsReachable) && !(status
>
& kSCNetworkFlagsConnectionRequired);
>
>
if (!okay)
>
{
>
success = SCNetworkCheckReachabilityByName("www.w3.org",
>
&status);
>
>
okay = success && (status & kSCNetworkFlagsReachable) &&
>
!(status & kSCNetworkFlagsConnectionRequired);
>
}
>
>
return okay;
>
}
>
>
Hope this helps.
>
>
--
>
>
David Sinclair, Dejal Systems, LLC - email@hidden
>
>
Let Dejal Simon keep an eye on your sites for changes or failures!
>
http://www.dejal.com/simon/
>
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>
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