Qt 域名转成IP

#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(1);
        }

        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);