1. 基本知识

网络库

• QHostInfo / QNetworkInterface
• 获取本地主机名称和ip

#include <QHostInfo>
#include <QNetworkInterface>

void Widget::GetHostNameAndIp()
{
    QString strLocal = QHostInfo::localHostName();  //Get Host PC Name


    QString strLoacalAddr = "";  // Get Host PC IP addr by name
    QHostInfo hostInfo = QHostInfo::fromName(strLocal);

    QList<QHostAddress> ipaddrList = hostInfo.addresses();

    if(!ipaddrList.isEmpty())
    {
        for(int i = 0; i < ipaddrList.size(); i++)
        {
            QHostAddress addrHost = ipaddrList.at(i);

            if(QAbstractSocket::IPv4Protocol == addrHost.protocol())
            {
                strLoacalAddr = addrHost.toString();
                break;
            }
        }
    }

    qDebug() << strLocal << strLoacalAddr;


    QString temp = "";
    QList<QNetworkInterface> netList = QNetworkInterface::allInterfaces();

    for(int i = 0; i < netList.size(); i++)
    {
        QNetworkInterface interfaces = netList.at(i);
        qDebug() << "设备名称:" << interfaces.name();
        qDebug() << "硬件地址:" << interfaces.hardwareAddress();

        QList<QNetworkAddressEntry> entrylist =  interfaces.addressEntries();

        for(int j = 0; j < entrylist.size(); j++)
        {
            QNetworkAddressEntry enter = entrylist.at(j);
            qDebug() << "IP地址:" << enter.ip().toString();
            qDebug() << "子网掩码:" << enter.netmask().toString();
            qDebug() << "广播地址:" << enter.broadcast().toString();
        }
    }
}

• 获取域名对应的主机ip

QString Widget::ProtocolType(QAbstractSocket::NetworkLayerProtocol protocal)
{
    switch(protocal)
    {
    case QAbstractSocket::IPv4Protocol:
        return "IPv4Protocol";
        break;

    case  QAbstractSocket::IPv6Protocol:
        return "IPv6Protocol";
        break;

    case  QAbstractSocket::AnyIPProtocol:
        return "AnyIPProtocol";
        break;

    case  QAbstractSocket::UnknownNetworkLayerProtocol:
        return "UnknownNetworkLayerProtocol";
        break;

    default:
        break;
    }

    return "";
}



private slots:
void Widget::GetIpList(const QHostInfo &host)
{
    QList<QHostAddress> ipaddrList = host.addresses();

    for(int i = 0; i < ipaddrList.size(); i++)
    {
        QHostAddress host = ipaddrList.at(i);
        qDebug() << "协议类型:" << ProtocolType(host.protocol());
        qDebug() << "本地Ip地址:" << host.toString();
    }
}


QString domainName = "www.baidu.com";
QHostInfo::lookupHost(domainName, this, SLOT(GetIpList(QHostInfo)));