//獲取本機IP  
QString getIP(QString localHost)  
{  
    QString ipAddr;  
#if 0  
    QList<QHostAddress> AddressList = QNetworkInterface::allAddresses();  
    foreach(QHostAddress address, AddressList){  
        if(address.protocol() == QAbstractSocket::IPv4Protocol &&  
                address 
 
!= QHostAddress::Null &&  
                address != QHostAddress::LocalHost){  
            if (address.toString().contains("127.0.")){  
                continue;  
            }  
            ipAddr = address.toString();  
            break;  
        }  
    }  
#else  
    QHostInfo info 
 
= QHostInfo::fromName(localHost);  
    info.addresses();//QHostInfo的address函數獲取本機ip地址  
    //如果存在多條ip地址ipv4和ipv6：  
    foreach(QHostAddress address,info.addresses())  
    {  
        if(address.protocol()==QAbstractSocket::IPv4Protocol){//只取ipv4協議的地址  
            qDebug()<<address.toString();  
            ipAddr 
 
= address.toString();  
        }  
    }  
#endif  
    return ipAddr;  
}  

qt獲取本機ip