Question

我使用可访问性类来检查代码中的wifi连接。但有时会出现问题，即wifi已打开，但没有或低互联网连接，这里我的代码在循环中运行，等待来自被调用的webservice的任何响应，并且有时会出现挂起和崩溃。当我在AlertView上点击OK时会执行以下代码，这会从webservice中提取一些数据这是我的代码：

        Reachability *ReachObj = [Reachability reachabilityForInternetConnection];
    [ReachObj startNotifier];
    NetworkStatus remoteHostStatus = [ReachObj currentReachabilityStatus];

    if (remoteHostStatus==ReachableViaWiFi) 
    {
        SecondView *ObjSecView=[[SecondView alloc]init];
        [self presentModalViewController:ObjSecView animated:YES];
    }

    else
        if (remoteHostStatus==NotReachable)
    {
        FirstView *objFrstView=[[FeedBackPopOverViewController alloc]init];
        [self presentModalViewController:objFrstView animated:YES];     
    }

我是Objective C的新手。 Plz帮助我，提前谢谢。抱歉我的语法错误。

Answer 1

试试这个..

SCNetworkReachabilityFlags flags;

 SCNetworkReachabilityRef reachability=SCNetworkReachabilityCreateWithName(NULL, [@"your        web sevice url" UTF8String]);

SCNetworkReachabilityGetFlags(reachability, &flags);
BOOL reachable=!(flags & kSCNetworkReachabilityFlagsConnectionRequired);

CFRelease(reachability);
NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];


if([NSURLConnection canHandleRequest:request] && reachable)
 { 
conn=[NSURLConnection connectionWithRequest:request delegate:self];

if(conn)
{
    ////        

}
else
{
    [_delegate performSelector:@selector(httpDataDidFailLoadingWithReason:) 
                    withObject:@"No Internet Connection"    afterDelay:0.1];
 }

 }


 -(void) httpDataDidFailLoadingWithReason:(NSString*)reason
 {

UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"abc" 
                                                   message:reason
                                                   delegate:self cancelButtonTitle:@"OK"
                                           otherButtonTitles:nil];
[alertView show];
[alertView release];

  }

Answer 2

-(void)loginButtonTouched
{  
    bool success = false;
    const char *host_name = [@"www.google.com" 
                 cStringUsingEncoding:NSASCIIStringEncoding];

    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName
                                                    (NULL, host_name);
    SCNetworkReachabilityFlags flags;
    success = SCNetworkReachabilityGetFlags(reachability, &flags);
    bool isAvailable = success && (flags & kSCNetworkFlagsReachable) && 
                       !(flags & kSCNetworkFlagsConnectionRequired);

    if (isAvailable) 
    {
        NSLog(@"Host is reachable: %d", flags);
        // Perform Action if Wifi is reachable and Internet Connectivity is present
    }
    else
    {
        NSLog(@"Host is unreachable");
        // Perform Action if Wifi is reachable and Internet Connectivity is not present
    }       
}

当调用loginButtonTouched方法时，我们检查“www.google.com”是否可访问。 SCNetworkReachabilityFlags返回标志，帮助我们了解互联网连接的状态。如果isAvailable变量返回“true”，那么Host is Reachable意味着可以访问Wifi并且存在Internet连接。

感谢所有人提供您对我们问题的快速回答。对不起我的语法错误。

检查wifi是否开启但没有互联网连接

2 个答案: