How do you know if it is connected?

[fanxinglanyu]

This is my code.But I have a problem. When the Internet is disconnected, it will show that the Internet is not disconnected for 1 minute.Thanks,I need your help.

    QHostInfo::lookupHost("www.baidu.com", this, &MainWindow::netWorkStatus);
bool MainWindow::netWorkStatus(const QHostInfo& host)
{

    if (host.error() != QHostInfo::NoError) {
        qDebug() << "Lookup failed:" << host.errorString();
        ui->label_2->setText("Broken network");
        return false;
    }else{

        qDebug()<<"";
        ui->label_2->setText("Connected to the Internet");

       // QHostInfo::abortHostLookup(lookupID);

        return true;
    }
}

[raven-worx]

@fanxinglanyu
https://forum.qt.io/topic/98676/how-to-check-whether-the-computer-connects-the-internet

[fanxinglanyu]

Firstly, thanks your reply!However,I think this isn't solve my question.In China, Google is not accessible.

[fanxinglanyu]

I use a method to solve this problem.This is my code:

bool MainWindow::check()
{
    QTcpSocket* sock = new QTcpSocket(this);
    sock->connectToHost("www.google.com", 80);
    bool connected = sock->waitForConnected(30000);//ms

    if (!connected)
    {
        sock->abort();
        return false;
    }
    sock->close();
    return true;
}

[fanxinglanyu]

I think I have a better idea of using threads to monitor network state. The way to do this is to use the above method in the thread and use QTimer.