Paste code

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QtCore>
 
#include <QtNetwork/QtNetwork>
#include <QDebug>
#include <QFile>
 
 
#include <QtGui>
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
 
    QFile file;
 
    QString link;
    QLineEdit* edit;
    QPushButton* btn;
    QGridLayout* layout;
    QNetworkAccessManager* networkManager() { return pNetManager; }
 
    ~MainWindow();
 
private:
    QNetworkAccessManager *pNetManager;
 
public slots:
    void slotReadyRead();
    void slotError(QNetworkReply::NetworkError);
    void slotFinished();
};
 
#endif // MAINWINDOW_H
 
 
 
 
#include "mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    pNetManager = new QNetworkAccessManager(this);
 
    QNetworkRequest request;
    request.setUrl(QUrl("http://www.google.ru/favicon.ico"));   
    QNetworkReply *reply = pNetManager->get(request);
    connect(reply, SIGNAL(readyRead()), this, SLOT(slotReadyRead()));
    connect(reply, SIGNAL(error(QNetworkReply::NetworkError)),
                this, SLOT(slotError(QNetworkReply::NetworkError)));
    connect(reply, SIGNAL(finished()), this, SLOT(slotFinished()));
 
    layout = new QGridLayout;
    btn=new QPushButton("download");      
    edit = new QLineEdit("adress");
    layout->addWidget(edit,0,0);
    layout->addWidget(btn,1,0);
    QWidget *widget = new QWidget;
    widget->setLayout(layout);
    setCentralWidget(widget);
    file.setFileName("favicon.ico");
    file.open(QIODevice::WriteOnly);
 
}
 
void MainWindow::slotReadyRead()
{
    QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());
    file.write(reply->readAll());
}
void MainWindow::slotFinished()
{   
    QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());
    file.close();
    reply->deleteLater();
}
void MainWindow::slotError(QNetworkReply::NetworkError error)
{
 
}
 
MainWindow::~MainWindow()
{
 
}
 
 
 
 
#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    return a.exec&#40;&#41;;
}