QNetworkInterface::addressEntries() returns empty list

DrEmbo

Hello,

I am relying on QNetworkInterface::addressEntries() to get the IP address of an interface, in this case eth0. Every 10 seconds the following code is executed:

QList<QNetworkInterface> interfaceList= QNetworkInterface::allInterfaces();
    QList<QNetworkAddressEntry> entries;    
    if(!interfaceList.empty()) {
        QNetworkInterface interface;

        foreach (interface, interfaceList) {
            if (interface.name().startsWith("e") && interface.addressEntries().size() !=0) {
                 entries = interface.addressEntries();

                // Do something with the interface                
            }
        }
    }

To check if the connection is actually still there I used the ip addr command and have seen that the IPs are still ok. However as addressEntries() are empty my code could not proceed.

Currently I am using Qt 5.9.6, IP address set to DHCP.

Is this a known issue? Any ideas how to solve this problem?

Regards,
Dule

JoeCFD

@DrEmbo said in QNetworkInterface::addressEntries() returns empty list:

allInterfaces

this works for me with Qt 5.15.2 on Linux.

    QList< QNetworkInterface > network_interfaces = QNetworkInterface::allInterfaces();
    for( auto interface : network_interfaces ) {
        if ( interface.flags().testFlag( QNetworkInterface::IsRunning ) ) {
            auto address_entries = interface.addressEntries();
            for ( auto address_entry : address_entries ) {
                      ..................
            }
        }
   }