iphone - Heavy bug in Apple's Reachability source code? (reachabilityForLocalWiFi) -

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i wanted integrate network status notification project , used apples's reachability class this. nevertheless might have found bug in code or maybe caused simulator itself.

code here:

- (void)start {      [[nsnotificationcenter defaultcenter] addobserver:self                                              selector:@selector(updatestatus:)                                                   name:kreachabilitychangednotification                                                 object:nil];      reachability *wifi = [[reachability reachabilityforlocalwifi] retain];     [wifi startnotifier];  }  - (void)updatestatus:(nsnotification *)notice {     networkstatus s = [[notice object] currentreachabilitystatus];     if(s == notreachable) {         nslog(@"wifi not reachable");     } else {         nslog(@"wifi reachable");     } }

now, happens when "start" called:

1) updatestatus message isn't fired - okay, might not bug, maybe normal behaviour

2) updatestatus message fired, when switch mac's airport off , networkstatus eq. "notreachable", when turn mac's airport on again updatestatus message fired , networkstatus stays "notreachable"

when add in start method timer, doing separate requests on status

- (void)start {      [[nsnotificationcenter defaultcenter] addobserver:self                                              selector:@selector(updatestatus:)                                                   name:kreachabilitychangednotification                                                 object:nil];      reachability *wifi = [[reachability reachabilityforlocalwifi] retain];     [wifi startnotifier];      /* added */     [nstimer scheduledtimerwithtimeinterval:0.5f target:self selector:@selector(updateseparately:) userinfo:nil repeats:yes];     /* * */  }

and "updateseparately" method itself

/* added */ - (void)updateseparately:(nstimer *)timer {      networkstatus s = [[reachability reachabilityforlocalwifi] currentreachabilitystatus];      if(s == notreachable) {         nslog(@"updateseparately:wifi not reachable");     } else {         nslog(@"updateseparately:wifi reachable");     } } /* * */

gives me following outputs in console next scenarios:

1) airport turned on, start app , turn airport off

... 2011-07-21 09:41:41.242 myproject[7091:207] updateseparately:wifi reachable 2011-07-21 09:41:41.742 myproject[7091:207] updateseparately:wifi reachable 2011-07-21 09:41:42.242 myproject[7091:207] updateseparately:wifi reachable 2011-07-21 09:41:42.264 myproject[7091:207] --- status change --- 2011-07-21 09:41:42.265 myproject[7091:207] wifi not reachable 2011-07-21 09:41:42.743 myproject[7091:207] updateseparately:wifi not reachable 2011-07-21 09:41:43.243 myproject[7091:207] updateseparately:wifi not reachable 2011-07-21 09:41:43.743 myproject[7091:207] updateseparately:wifi not reachable ...

this seems correct

2) after airport has been turned off turn on again (app still running)

... 2011-07-21 09:45:42.702 myproject[7133:207] updateseparately:wifi not reachable 2011-07-21 09:45:43.202 myproject[7133:207] updateseparately:wifi not reachable 2011-07-21 09:45:43.701 myproject[7133:207] updateseparately:wifi not reachable 2011-07-21 09:45:43.795 myproject[7133:207] --- status change --- 2011-07-21 09:45:43.795 myproject[7133:207] wifi not reachable 2011-07-21 09:45:44.200 myproject[7133:207] updateseparately:wifi not reachable 2011-07-21 09:45:44.700 myproject[7133:207] updateseparately:wifi not reachable 2011-07-21 09:45:45.200 myproject[7133:207] updateseparately:wifi not reachable 2011-07-21 09:45:45.701 myproject[7133:207] updateseparately:wifi reachable 2011-07-21 09:45:46.201 myproject[7133:207] updateseparately:wifi reachable 2011-07-21 09:45:46.701 myproject[7133:207] updateseparately:wifi reachable ...

this shows networkstatus change has been noticed.... why stay "notreachable" ~2 seconds?

does have explanation this?

ps. same thing happens in apple's reachability sample project (available here http://developer.apple.com/library/ios/#samplecode/reachability/introduction/intro.html)

thanks reading,

mizer

use reachability class here

i use in apps , works well.


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