CODEWITHSUNDEEP
iphonenetwork-programmingconnection
vadivelu
vadivelu

Reputation: 508

Check Network Connection iPhone

I am developing app in iPhone which is fetch the data from website dynamically, I am checking whether Wifi and GPRS are connected but when wifi is not reachable, App crash.

I am using this method to check connection.

+ (BOOL) isConnected {  
    // Part 1 - Create Internet socket addr of zero
    struct sockaddr_in zeroAddr;
    bzero(&zeroAddr, sizeof(zeroAddr));
    zeroAddr.sin_len = sizeof(zeroAddr);
    zeroAddr.sin_family = AF_INET;

    // Part 2- Create target in format need by SCNetwork
    SCNetworkReachabilityRef target = 
    SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *) &zeroAddr);

    // Part 3 - Get the flags
    SCNetworkReachabilityFlags flags;
    SCNetworkReachabilityGetFlags(target, &flags);

    // Part 4 - Create output
    NSString *sNetworkReachable;
    if (flags & kSCNetworkFlagsReachable)
        sNetworkReachable = @"YES";
    else
        sNetworkReachable = @"NO";

    NSString *sCellNetwork;
    if (flags & kSCNetworkReachabilityFlagsIsWWAN)
        sCellNetwork = @"YES";
    else
        sCellNetwork = @"NO";


    // Get host entry info for given host
    struct hostent *remoteHostEnt = gethostbyname("google.com");
    if(remoteHostEnt == nil ) return NO;

    // Get address info from host entry
    struct in_addr *remoteInAddr = (struct in_addr *) remoteHostEnt->h_addr_list[0];

    // Convert numeric addr to ASCII string
    char *sRemoteInAddr = inet_ntoa(*remoteInAddr);

    NSString *s = [[NSString alloc]
                 initWithFormat:
                 @"Network Reachable: %@\n"
                 @"Cell Network: %@\n"
                 @"Remote IP: %s\n",
                 sNetworkReachable,
                 sCellNetwork,
                 sRemoteInAddr];


    // Add text
    [sCellNetwork release];
    [sNetworkReachable release];

    NSLog(@"Message:%@",s);

    return [sNetworkReachable isEqualToString:@"YES"];  
}

Thanks Vadivelu

Upvotes: 1

Views: 5645

Answers (3)

Abizern
Abizern

Reputation: 150745

Search for the Reachability sample application on developer.apple.com

There is also the Open Source NPReachability class on GitHub which does the same thing but uses a block as a handler.

Upvotes: 2

Pankaj Kainthla
Pankaj Kainthla

Reputation: 2489

You could use a hidden UIWebView and load a website to it. Then use methods from the UIWebView.h to detect, whether loading was successful or not.

Upvotes: -1

Costique
Costique

Reputation: 23722

Why mess with IP addresses? You can call SCNetworkReachabilityCreateWithName() directly instead:

SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, "google.com");

Upvotes: 4

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