I am trying to get information about an active internet connection.

I can see if I have WiFi connected:

bool networkConnectionInfo::isWifiConnected(connectionDetails& details)
{
    HANDLE hClient = NULL;
    DWORD dwMaxClient = 2; // Version of client
    DWORD dwCurVersion = 0;
    DWORD dwResult = 0;
    PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
    PWLAN_INTERFACE_INFO pIfInfo = NULL;
    PWLAN_CONNECTION_ATTRIBUTES pConnectInfo = NULL;
    DWORD connectInfoSize = 0;
    WLAN_OPCODE_VALUE_TYPE opCode = wlan_opcode_value_type_invalid;

    dwResult = WlanOpenHandle(dwMaxClient, NULL, &dwCurVersion, &hClient);
    if (dwResult != ERROR_SUCCESS)
    {
        return false;
    }

    dwResult = WlanEnumInterfaces(hClient, NULL, &pIfList);
    if (dwResult != ERROR_SUCCESS)
    {
        WlanCloseHandle(hClient, NULL);
        return false;
    }

    for (unsigned int i = 0; i < pIfList->dwNumberOfItems; i++)
    {
        pIfInfo = (WLAN_INTERFACE_INFO*)&pIfList->InterfaceInfo[i];
        if (pIfInfo->isState == wlan_interface_state_connected)
        {
            dwResult = WlanQueryInterface(hClient,
                &pIfInfo->InterfaceGuid,
                wlan_intf_opcode_current_connection,
                NULL,
                &connectInfoSize,
                (PVOID*)&pConnectInfo,
                &opCode);

            if (dwResult == ERROR_SUCCESS)
            {
                details.ssid = std::string((char*)pConnectInfo->wlanAssociationAttributes.dot11Ssid.ucSSID,
                    pConnectInfo->wlanAssociationAttributes.dot11Ssid.uSSIDLength);

                details.signalQuality = static_cast<int>(pConnectInfo->wlanAssociationAttributes.wlanSignalQuality);

                WlanFreeMemory(pConnectInfo);
                WlanFreeMemory(pIfList);
                WlanCloseHandle(hClient, NULL);
                return true;
            }
        }
    }

    WlanFreeMemory(pIfList);
    WlanCloseHandle(hClient, NULL);
    return false;
}

but I do not know how to check the ethernet connection. Also if Ethernet & WiFi are both connected and Windows is using a wired connection to communicate with the internet – how can get this information?

Also, I have not found a way to check if there is a cellular connection active.