Thank you the quickly advices of Michael and Mike very much. I test Michael's sample, it works well. But I think the SCNetworkReachability API is also used to try to connect to the server, right?
What I want is to get the status of the network without any connection to the server. Maybe What I said is not so clearly. Finally, I found the SCDynamicstore API and the following sample http://www.cocoabuilder.com/archive/message/cocoa/2006/7/21/168076 it seems to give me what i need. I think exactly I need to get the status of the system configuration. thank you again 2008/7/10 Mike <[EMAIL PROTECTED]>: > The SCF documentation specifically says SC routines cannot be used to test > *remote* reachability and should only be used to test whether a packet can > *leave* the host. If this is all you need, then Michael's example will work. > If you need to test remote reachability, you will need to devise some other > method. > > Mike > > Michael Kaye wrote: >> >> Try the SCNetworkReachability API... >> >> I borrowed the following from one of Apple's examples: >> >> - (BOOL)isDataSourceAvailable >> { >> static BOOL checkNetwork = YES; >> if (checkNetwork) { // Since checking the reachability of a host can be >> expensive, cache the result and perform the reachability check once. >> checkNetwork = NO; >> >> Boolean success; >> const char *host_name = "http://localhost:8080";; >> SCNetworkReachabilityRef reachability = >> SCNetworkReachabilityCreateWithName(NULL, host_name); >> SCNetworkReachabilityFlags flags; >> success = SCNetworkReachabilityGetFlags(reachability, &flags); >> _isDataSourceAvailable = success && (flags & >> kSCNetworkFlagsReachable) && !(flags & kSCNetworkFlagsConnectionRequired); >> } >> return _isDataSourceAvailable; >> } >> >> HTHs. Michael. >> >> On 9 Jul 2008, at 13:22, xiaobin wrote: >> >>> Hello, >>> >>> I am writing a program to detect the status of network. >>> >>> In my program, I need get the status of network when the connection is >>> set disable. here it is not by connecting the network to get the >>> status. >>> which API or method can work for it? >>> >>> for example, if my lan cable is unpluged or the network is set >>> disable, it is certainly to know the status of the network is off. so >>> it is not necessary to connect the network to get the status. >>> so I want to know When it is clearly to know the status of the network >>> is on or off, which API or method can get the status. >>> >>> I have read the example of apple's document for using CFDiagnostics >>> to check whether the network is connected or not, but I think it is >>> not for my need. It is by connecting the network to get the status. >>> >>> Would anyone can give me a help ? >>> >>> Thanks a lot >>> _______________________________________________ >>> >>> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >>> >>> Please do not post admin requests or moderator comments to the list. >>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >>> >>> Help/Unsubscribe/Update your Subscription: >>> http://lists.apple.com/mailman/options/cocoa-dev/michaelkaye%40mac.com >>> >>> This email sent to [EMAIL PROTECTED] >> >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> >> http://lists.apple.com/mailman/options/cocoa-dev/junklists%40michael-amorose.com >> >> This email sent to [EMAIL PROTECTED] >> > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/leptonw%40gmail.com > > This email sent to [EMAIL PROTECTED] > -- xiaobin _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
