QFile *file = new QFile("C:/qt/"+str);
        if(file->open(QFile::ReadWrite))
        {
            file->write(reply->readAll());
            file->flush();
            file->close();
        }
        delete file;

QFile *file = new QFile("C:/qt/"+str);
        if(file->open(QFile::ReadWrite))
        {
            file->write(reply->readAll());
            file->flush();
            file->close();
        }
        delete file;

 qint64 fs=file->size();
            qint64 rs=reply->size();
            qint64 i=fs;
            while (i<=rs){
                char data[1];

                reply->read(data,1);    
                file->write(data);
                file->flush();
                i=i+1;
            }
            file->close();

User-agent: *
Disallow: /cabinet/
Disallow: /test/
Sitemap: http://kz-test.besaba.com/sitemap.xml
Host: kz-test.besaba.com/

User-ageyT§хёЦnt: *
DyT§хёЦisallow:yT§хёЦ /cabineyT§хёЦt/
DisayT§хёЦllow: /tyT§хёЦest/
SiyT§хёЦtemap: hyT§хёЦttp://kzyT§хёЦ-test.beyT§хёЦsaba.comyT§хёЦ/sitemapyT§хёЦ.xml
HoyT§хёЦst: kz-tyT§хёЦest.besayT§хёЦba.com/
yT§хёЦ
a.com/
yT§хёЦ

 QFile *file=new QFile("C:/qt/"+str);
        if(file->open(QFile::ReadWrite)){
            qint64 fs=file->size();
            qint64 rs=reply->size();
            qint64 i=fs;
            int n=8;
            while (i<=rs){
                char data[8];
                if(rs-i<8)n=rs-i;
                reply->read(data,n);
                file->write(data,n);
                file->flush();
                i=i+8;
            }
            file->close();
        }
        delete file;

qint64 fs=file->size();
            qint64 rs=reply->size();
            qint64 i=fs;
            int n=8;
            while (i<=rs){

 QFile *file=new QFile("C:/qt/"+str);
        if(file->open(QFile::ReadWrite)){
            qint64 fs=file->size();
            qint64 rs=reply->size();
            qint64 i=fs;
            int n=8;
            char data[8];
            reply->seek(fs);
            file->seek(fs);
            while (i<=rs/2){
                if(rs-i<8)n=rs-i;
                reply->read(data,n);
                file->write(data,n);
                file->flush();
                i=i+8;
            }
            file->close();
        }

 QFile *file=new QFile("C:/qt/"+str);
            if(file->open(QFile::Append)){
            qint64 fs=file->size();
            qint64 rs=reply->size();
            qint64 i=fs;
            int n=8;
            char data[8];
            reply->seek(fs);
            file->seek(fs);
            while (i<=rs){
                if(rs-i<8)n=rs-i;
                reply->read(data,n);
                file->write(data,n);
                file->flush();
                i=i+8;
            }
            file->close();
        }

  manager=new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
                this, SLOT(replyFinished(QNetworkReply*)));
    manager->get(QNetworkRequest(QUrl(ui->lineEdit->text())));

 manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
                this, SLOT(replyFinished(QNetworkReply*)));
    QNetworkRequest req;
    req.setRawHeader("Content-Range","bytes 10-29/30");
    req.setUrl(QUrl("http://localhost/"));
    manager->get(req);
    qDebug()<<"finished!";

req.setRawHeader("Range","bytes=10-29");

    manager=new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
                this, SLOT(replyFinished(QNetworkReply*)));
    QNetworkRequest req;
    req.setRawHeader("Range","bytes=0-734003199");
    req.setUrl(QUrl(ui->lineEdit->text()));
    manager->get(req);

    manager=new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
                this, SLOT(replyFinished(QNetworkReply*)));
    QNetworkRequest req;
    req.setRawHeader("Range","bytes=0-1048575");
    req.setUrl(QUrl(ui->lineEdit->text()));
    manager->get(req);

    manager=new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
                this, SLOT(replyFinished(QNetworkReply*)));
    QNetworkRequest req;
    req.setRawHeader("Range","bytes=0-734003199");
    req.setUrl(QUrl(ui->lineEdit->text()));
    manager->get(req);

if(file->open(QFile::ReadWrite))
        {
            file->write(reply->readAll());
            file->flush();
            file->close();
        }

public slots:
    void replayFinished(QNetworkReply *rr){
        qDebug()<<"replay= "<<rr->readAll();
    };

int myrequest::sendpost(QString url,QString data){
    QNetworkRequest req;
    manager=new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replayFinished(QNetworkReply*)));
    req.setHeader( QNetworkRequest::ContentTypeHeader, "text/html" );
    req.setUrl(QUrl(url));
    manager->post(req, data.toUtf8());
    return 0;
}

void MainWindow::on_pushButton_clicked()
{
    myrequest mr;
    QString url="",data="";
    url="http://localhost/reg.php";
    data.append("lastname="+ui->lineEdit->text());
    data.append("&firstname="+ui->lineEdit_2->text());
    data.append("&fathername="+ui->lineEdit_3->text());
    data.append("&login="+ui->lineEdit_4->text());
    data.append("&pass="+ui->lineEdit_5->text());
    mr.sendpost(url,data);
    
}

void MainWindow::on_pushButton_2_clicked()
{   int ver=1;
    myrequest mr;
    QString url="",data="",s="user_version=1";;
    url="http://localhost/new_version.php";
    data.append(s);
    mr.sendpost(url,data);
}

int myrequest::sendpost(QString url,QString data){
    QNetworkRequest req;
    manager=new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replayFinished(QNetworkReply*)));
    req.setHeader( QNetworkRequest::ContentTypeHeader, "text/html" );
    req.setUrl(QUrl(url));
    manager->post(req, data.toUtf8());
    return 0;
}
[/quot]
тут я переделал вот так
[SRC c++]

int myrequest::sendpost(QString url,QString data){
    QNetworkRequest req;
    manager=new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replayFinished(QNetworkReply*)));
    req.setHeader(QNetworkRequest::ContentTypeHeader,QVariant("application/x-www-form-urlencoded"));
    req.setUrl(QUrl(url));
    manager->post(req, data.toUtf8());

    return 0;
}

public slots:
    void replayFinished(QNetworkReply *rr){
        qDebug()<<"replay= "<<rr->readAll();
    };

int myrequest::sendpost(QString url,QString data){
    QNetworkRequest req;
    manager=new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replayFinished(QNetworkReply*)));
    req.setHeader(QNetworkRequest::ContentTypeHeader,QVariant("application/x-www-form-urlencoded"));
    req.setUrl(QUrl(url));
    manager->post(req, data.toUtf8());

    return 0;
}

void MainWindow::on_pushButton_clicked()
{
    myrequest mr;
    QString url="",data="";
    url="http://localhost/reg.php";
    data.append("lastname="+ui->lineEdit->text());
    data.append("&firstname="+ui->lineEdit_2->text());
    data.append("&fathername="+ui->lineEdit_3->text());
    data.append("&login="+ui->lineEdit_4->text());
    data.append("&pass="+ui->lineEdit_5->text());
    mr.sendpost(url,data);
    
}

void MainWindow::on_pushButton_2_clicked()
{   int ver=1;
    myrequest mr;
    QString url="",data="",s="user_version=1";;
    url="http://localhost/new_version.php";
    data.append(s);
    mr.sendpost(url,data);
}