Question

我正在使用Reachability框架来检测接口类型。使用单一界面时，它工作正常。但是当使用多个网络接口时，它会异常工作。它在以下情况下失败 -

假设您有两个网络接口，一个是WiFi，另一个是蜂窝网络（3G，2G，EDGE等）。当我尝试检测每个接口的接口类型时，它会为每种情况返回WiFi。但只连接WiFi或3G接口时工作正常。我使用以下代码来检测接口类型 -

 static struct sockaddr_in zeroAddress;
 bzero(&zeroAddress, sizeof(zeroAddress));
 zeroAddress.sin_len = sizeof(zeroAddress);
 zeroAddress.sin_family = AF_INET;

 SCNetworkReachabilityFlags flags;

 AFNetworkInterfaceType  interfaceType = AF_NIC_TYPE_UNKNOWN;

 bool reachable = true;

 UserInfo info;

 static SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)&zeroAddress);


 SCNetworkReachabilityContext context = {0, &info, NULL, NULL, NULL};


 if (SCNetworkReachabilityGetFlags(reachability, &flags))
 {

  if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
  {
   // The target host is not reachable.
   reachable = false;

   if ((flags & kSCNetworkReachabilityFlagsReachable) && (flags & kSCNetworkReachabilityFlagsIsDirect))
   {
    interfaceType = AF_NIC_TYPE_WIFI;
   }
  }

  if ( true == reachable  && (flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
  {
   /*
    If the target host is reachable and no connection is required then we'll assume (for now) that you're on Wi-Fi...
    */

   interfaceType =  AF_NIC_TYPE_WIFI;

  }


  if ( true == reachable && (((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
           (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
  {
   /*
    ... and the connection is on-demand (or on-traffic) if the calling application is using the CFSocketStream or higher APIs...
    */

   if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
   {
    /*
     ... and no [user] intervention is needed...
     */
    interfaceType = AF_NIC_TYPE_WIFI;
   }
  }

  if ( true == reachable && (flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
  {
   /*
    ... but WWAN connections are OK if the calling application is using the CFNetwork APIs.
    */
   interfaceType = AF_NIC_TYPE_CELLULAR;
  }
 }

调试后我看到它进入第二个块并检测到接口类型WiFi。有人可以告诉我如何正确确定所有网络接口的类型。

N.B：我在C ++库解决方案中使用上述代码，这是一个跨平台库。

Answer 1

此问题已得到修复。发布以便用户可以获得帮助。主要问题是我在zeroAddress结构中传递NULL。在结构中分配我的网络接口地址后，它会正确传递所有案例和确定的网络接口类型。

当存在多个网络接口时，可检测接口类型时可达性框架不能正常工作

1 个答案: