获取host信息

QT如果要进行网络编程首先需要在.pro”中添加如下代码：
QT += network
在头文件中包含相关头文件：
#include <QHostInfo>
#include <QNetworkInterface>

QHostInfo类用于获得主机信息。示范代码如下：
 QString localHostName = QHostInfo::localHostName();
    QHostInfo hostInfo = QHostInfo::fromName(localHostName);
    QList<QHostAddress> list = hostInfo.addresses();
    if(!list.isEmpty())
    {
        QList<QHostAddress>::iterator i;
        for (i = list.begin();i != list.end();i++)
            QMessageBox::information(this,tr("提示"), (*i).toString());
    }

QNetworkInterface类获得与网络接口相关的信息，具体实现代码如下：
 QString detail="";
    QList<QNetworkInterface> list=QNetworkInterface::allInterfaces();
    QList<QNetworkInterface>::iterator i;
    for (i = list.begin();i != list.end();i++)
    {
        QNetworkInterface interface=*i;
        detail=tr("设备：")+interface.name()+"\n";
        detail=detail+tr("硬件地址：")+interface.hardwareAddress()+"\n";
        QList<QNetworkAddressEntry> entryList=interface.addressEntries();
        QList<QNetworkAddressEntry>::iterator j;
        for (j = entryList.begin();j != entryList.end();j++)
        {
            QNetworkAddressEntry entry=*j;
            detail=detail+"\t"+tr("IP 地址：")+entry.ip().toString()+"\n";
            detail=detail+"\t"+tr("子网掩码：")+entry.netmask().toString()+"\n";
            detail=detail+"\t"+tr("广播地址：")+entry.broadcast().toString()+"\n";
        }
        QMessageBox::information(this,tr("Detail"),detail);
    }

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