Check for network connection

gistfile1.m

- (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) 
	{ 
		NSLog(@"Error. Could not recover network reachability flags"); 
		return 0; 
	} 
	BOOL isReachable = flags & kSCNetworkFlagsReachable; 
	BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired; 
	return (isReachable && !needsConnection) ? YES : NO;
	
}