How to check if the connection is available ( iphone )?

Question

I used the following code to check this---
(the request is my request)

NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

if( theConnection )
{
    nslog(@"connection is present");

}
else
{-------error   message1-------------
}

and then in the delegates I relay on to receive response

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
-------error   message2-------------
}

I am presently checking everything on my simulator...and...detecting internet connection by just removing my internet cable...

but every time my program I got only message 2.....but it comes after 1 min(connection time over)...

but I want to check it in as minimum time as possible....

possible duplicate of [How to check for an active Internet Connection on iPhone SDK?](http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk) — Jesse Beder, Nov 01 '10 at 07:07

score 3 · Answer 1 · edited Nov 01 '10 at 07:05

Use this method:

- (BOOL) connectedToNetwork
{
 // Create zero addy
 struct sockaddr_in zeroAddress;
 bzero(&zeroAddress, sizeof(zeroAddress));
 zeroAddress.sin_len = sizeof(zeroAddress);
 zeroAddress.sin_family = AF_INET;

 // Recover reachability flags
 SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
 SCNetworkReachabilityFlags flags;

 BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
 CFRelease(defaultRouteReachability);

 if (!didRetrieveFlags)
 {
     printf("Error. Could not recover network reachability flags\n");
     return 0;
 }

 BOOL isReachable = flags & kSCNetworkFlagsReachable;
 BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
 return (isReachable && !needsConnection) ? YES : NO;
}

score 2 · Accepted Answer · answered Nov 01 '10 at 07:11

2

You may want to take a look at the Reachability exaxmple provided by Apple.

If you want your NSURLConnection to fail earlier, you need to specify a timeout in your NSURLRequest: requestWithURL:cachePolicy:timeoutInterval:

answered Nov 01 '10 at 07:11

Joseph Tura

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no i don't want to my NSURLConnection to fail earlier...this will create problem in those cases where internet connection is slow.. i want just to check if internet connection is available...if yes only then the request should send... – Ranjeet Sajwan Nov 01 '10 at 07:18
Check out the Reachability example, then. You could create a proxy that keeps track of changes in reachability. That way you will always know whether a connection exists. You can then adapt your interface accordingly (e.g. disable buttons, show action sheets etc., if no connectivity exists). – Joseph Tura Nov 01 '10 at 07:22

How to check if the connection is available ( iphone )?

2 Answers2