Re: How to know if Internet connection is active?
Re: How to know if Internet connection is active?
- Subject: Re: How to know if Internet connection is active?
- From: Angela Brett <email@hidden>
- Date: Tue, 6 Aug 2002 22:40:51 +1200
Hi,
In case the user uses a modem to connect to the Internet, and the connection
is not running, what happens when you call [... InitWithContentsOfURL]
methods or [NSWorkspace openURL]?
Do they simply return nil or do they make the modem connect to the Internet?
I would assume they'd make the modem connect to the internet iff the
computer is set up to do so in Network Preferences... I haven't tried
though. I guess I shouldn't have answered that question since I don't
know for sure, but I can answer your other question.
In the second case, is there any way in Cocoa to know if the computer is
connected to the Internet before calling any Cocoa method that might attempt
to do so?
I included SystemConfiguration.framework in my project, and use this method:
BOOL networkReachableWithoutAnythingSpecialHappening(void) {
Boolean Success;
SCNetworkConnectionFlags ReachabilityStatus;
Success = SCNetworkCheckReachabilityByName("www.apple.com"
&ReachabilityStatus);
return (Success && (ReachabilityStatus & 3));
}
3 is kSCNetworkFlagsTransientConnection|kSCNetworkFlagsReachable, I
chose that because it means the internet can be reached without any
user intervention or automatic dialling of the modem... but you
should look at the values in SCNetwork.h in
SystemConfiguration.framework and decide for yourself. You can change
the hostname to whatever you like, I don't think it makes a
difference.
--
Angela Brett
Email: email@hidden
Homepage:
http://acronyms.co.nz/angela
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