iOS-CheckNetWork

CheckNetWork.h

//
//  CheckNetWork.h
//  
//
//  Created by Isken Huang on 11/13/10.
//  Copyright 2010 Isken Huang. All rights reserved.
//

#import <netinet/in.h>
#import <SystemConfiguration/SCNetworkReachability.h>

@interface CheckNetwork : NSObject {

}

- (BOOL) check;

@end

CheckNetWork.m

//
//  CheckNetWork.m
//  
//
//  Created by Isken Huang on 11/13/10.
//  Copyright 2010 Isken Huang. All rights reserved.
//

#import "CheckNetwork.h"


@implementation CheckNetwork

- (BOOL) check{
    // 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 NO;
    }
    
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
	//NSLog(@"%d || %d", isReachable, needsConnection);
    return (isReachable && !needsConnection) ? YES : NO;
}

@end