How to check network status?

narae

I want to check the status of the network to know if I can connect to the Internet.
What should I do?

I did as below:

Utility.h

class Utility: public QObject{
    Q_OBJECT
public:
    static bool IsOnline();
};

Utility.cpp

bool Utility::IsOnline()
{

   bool result = false;
   QList<QNetworkInterface> ifaces = QNetworkInterface::allInterfaces();

   for (int i = 0; i < ifaces.count(); i++)
   {
       QNetworkInterface iface = ifaces.at(i);
       if ( iface.flags().testFlag(QNetworkInterface::IsUp)
            && !iface.flags().testFlag(QNetworkInterface::IsLoopBack) )
       {
           // this loop is important
           for (int j=0; j<iface.addressEntries().count(); j++)
           {
               // we have an interface that is up, and has an ip address
               // therefore the link is present

               // we will only enable this check on first positive,
               // all later results are incorrect
               if (result == false)
                   result = true;
           }
       }
   }

   return result;
}

If I disconnect the Ethernet connection from the Control Panel in Windows on VM, it returns false. -> It works.
However, if I turn off the wifi of mac and enable Ethernet from Contro Panel in Windows on VM, it returns true. -> It should return false.

What should I do?

sierdzio

Some platforms (Android) have a native API for this. A rock-solid (and quite wasteful) solution for all platforms is to ping a well-known server like Google (or your own server if you have one) periodically. If the connection does not work, you know that there is no Internet access.