Detect network connection in QT

Hi every body,
I have a problem when i detect network connection in Windows has install VirtualBox and VMWare.
This is my code:

Code:

---

bool MainWindow::IsNetworkConnected()
{
    bool bReturn = false;
    QList<QString> possibleMatches;
    QList<QNetworkInterface> ifaces = QNetworkInterface::allInterfaces();
    if ( !ifaces.isEmpty() )
    {
      for(int i=0; i < ifaces.size(); i++)
      {
        unsigned int flags = ifaces[i].flags();
        bool isLoopback = (bool)(flags & QNetworkInterface::IsLoopBack);
        bool isP2P = (bool)(flags & QNetworkInterface::IsPointToPoint);
        bool isRunning = (bool)(flags & QNetworkInterface::IsRunning);
        bool isUp = (bool)(flags && QNetworkInterface::IsUp);
 
        // If this interface isn't running, we don't care about it
        if ( !isRunning )
            continue;
        // We only want valid interfaces that aren't loopback/virtual and not point to point
        if ( !ifaces[i].isValid() || isLoopback || isP2P || !isUp)
            continue;
        QList<QHostAddress> addresses = ifaces[i].allAddresses();
        for(int a=0; a < addresses.size(); a++)
        {
          // Ignore local host
          if ( addresses[a] == QHostAddress::LocalHost ) continue;
 
          // Ignore non-ipv4 addresses
          if ( !addresses[a].toIPv4Address() )
              continue;
 
          QString ip = addresses[a].toString();
          if ( ip.isEmpty() )
              continue;
          bool foundMatch = false;
          for (int j=0; j < possibleMatches.size(); j++)
              if ( ip == possibleMatches[j] )
              {
                  foundMatch = true;
                  break;
              }
              if ( !foundMatch )
              {
                  possibleMatches.push_back( ip );
                  qDebug() << "possible address: " << ifaces[i].humanReadableName() << "->" << ip;
              }
        }
      }
    }
    return bReturn;
}

---

This function always return "true" when i disconnected internet conection.
And my Network and Share Center:
Attachment 10365

Please help me fix it.
Sorry my for my english skill.

Your code never sets bReturn to true so I cannot see a way that the function could return true.

Quote:

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Originally Posted by ChrisW67

Your code never sets bReturn to true so I cannot see a way that the function could return true.

---

Sorry. I want ask: "why foundMatch alway is true?". Please help me, i need some hint to check network is disconnect.
Thanks

I don't see where possibleMatches is filled with any values. My guess would be foundMatch is actually always false because your for loop is from 0 to 0. Also, I don't know if it's what you intended, but there are no brackets around that for loop.