#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <arpa/inet.h>
struct hostent *h;

        QByteArray ba = ui->lineEdit->text().toLatin1();

        h = gethostbyname(ba.data());

        if(h == NULL)

        {

            qDebug()<<"get hostbyname error!";

            exit();

        }

        struct in_addr *in=(in_addr *)h->h_addr;

        char *ch = inet_ntoa(*in);

        QString str = QString(QLatin1String(ch));

        qDebug()<<"IP Address:"<<str;

        ui->lineEdit_2->setText(str);