Question

this code is to check if internet connection is available or not.If internet connection is available then username and password should get validated from server database i.e send request method should get called and if not then username and password should get validated from local database i.e check method should get called.but the prob here is when the internet is off then also it gets into the send request method instead of getting in check nethod.What may be the prob.Please help me in solving this problem. i have added reachability files and imported the CFNetwork.framework.

- (void) showNetWorkAlert { 

   [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 
   UIAlertView *networkAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Network connection unavailable." 
                                            delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Retry", nil]; 
   [networkAlert show]; 
   [networkAlert release]; 
} 



#pragma mark To Check Network Connection. 
- (BOOL) currentNetworkStatus { 
   [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
   BOOL connected; 
   const char *host = "www.apple.com"; 
   SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, host); 
   SCNetworkReachabilityFlags flags; 
   connected = SCNetworkReachabilityGetFlags(reachability, &flags); 
   BOOL isConnected = YES; 
   isConnected = connected && (flags & kSCNetworkFlagsReachable) && !(flags & kSCNetworkFlagsConnectionRequired); 
   CFRelease(reachability); 

   if(!isConnected) { 
      // sleep(1); 
      [self showNetWorkAlert]; 
      //[self check];
   } 
   else 
      return isConnected; 
   //[self sendRequest];
   return isConnected; 
}


-(IBAction)buttonPressed:(id)sender
{
   //[self sendRequest];
   //[[Reachability sharedReachability] setHostName:kHostName];
   //Set Reachability class to notifiy app when the network status changes.
   //[[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES];
   //Set a method to be called when a notification is sent.
   //[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:@"kNetworkReachabilityChangedNotification" object:nil];
   //[self updateStatus];
   //[self sendRequest];
   //NSLog(<#NSString *format#>)
   //this is to select username and password from database.
   //[self check];
   if ([self currentNetworkStatus]) { 
      [self sendRequest];
   }
   else {
      [self check];
   }





}

Answer 1

Rocky your code is right .Just check the URL is proper or not .
there is other way also
On button check the host like this

[[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(reachabilityChanged:)
                                                     name:kReachabilityChangedNotification
                                                   object:nil];

        hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"]retain];
        [hostReach startNotifier];

and in the (reachabilityChanged:) method call make like this

-(void)reachabilityChanged:(NSNotification*)note
{
    static BOOL showNotConnnected =NO;
    Reachability *curReach =[note object];
    NSParameterAssert([curReach isKindOfClass:[Reachability class]]);
    NetworkStatus netStatus = [curReach currentReachabilityStatus];
    if(netStatus != NotReachable)
    {
        UIAlertView *notconnect1 = [[UIAlertView alloc]initWithTitle:@"Server is  connected" message:@"Server is connected" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:@"Cancel",nil];
        [notconnect1 show];
        [notconnect1 release];

    }
    else if(showNotConnnected == NO)
    {
        showNotConnnected =YES;
        UIAlertView *notconnect = [[UIAlertView alloc]initWithTitle:@"Server is Not connected" message:@"Server may be slow or not connected" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:@"Cancel",nil];
        [notconnect show];
        [notconnect release];
    }
}

I hope this will help you