iPhone app crashes while checking internet connectivity

In my iPhone app, I need to detect the internet Connection availability.

So I am referencing some files from "Reachability" project of Apple.

Link is given below:

http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html

I create a new project and implement the code below in viewWillAppear but the app crashes.

I included the Reachability.h, Reachability.m from Apple's demo project.

I also included SystemConfiguration Framework.

app works fine when Int开发者_JAVA技巧ernet is Working. But app Crashes when Internet in not Working.

Even I checked the console but there is no notification or error shown in the console.

   Reachability *r = [Reachability reachabilityWithHostName:@"www.google.com"];

NetworkStatus internetStatus = [r currentReachabilityStatus];
if ((internetStatus == ReachableViaWiFi) || (internetStatus == ReachableViaWWAN))
{
    UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"Internet Connection" message:@"Available" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
    [myAlert show];
    [myAlert release];
    }
else
{
    UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"No Internet Connection" message:@"This app require an internet connection via WiFi or cellular network to work." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
    [myAlert show];
    [myAlert release];
    }

What could be the reason for crash?

What should I do?

Thanks!!

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You're over-releasing the alerts. First, you do autorelease and then additionally release, which is too much. Just remove the two [myAlert release]; and it should work.

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Here it may be the case that your code does not work on simulator because of time out. But try running it on device. Also try debugging the code as @greg rightly said. For that credit should go to @greg. Hope this helps. Let me know if it works.

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Your problem is elsewhere in your code, as the code you provided along with copying Reachability.[mh] into a fresh Xcode project seems to work without crashing. When your app crashes, it must have some sort of information logged in the console. If there truly is nothing, set a breakpoint in your "startup" methods (viewWillLoad, viewDidLoad, AppDelegate stuff and step through line-by-line until you catch the problem.