C++ (Qt)
#ifndef PAGEDOWNLOADER_H
#define PAGEDOWNLOADER_H
 
#include <QtCore/QObject>
 
 
class QNetworkAccessManager;
class QNetworkReply;
 
class PageDownloader : public QObject
{
    Q_OBJECT
 
public:
	explicit PageDownloader(QObject *parent = 0);
 
private slots:
	void httpFinished(QNetworkReply *reply);
 
private:
	QNetworkAccessManager *qnam;
};
 
#endif // PAGEDOWNLOADER_H
 

C++ (Qt)
#include "pagedownloader.h"
 
#include <QtCore/QFile>
 
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkReply>
 
 
static const QString basePath = "http://my.website/";
 
PageDownloader::PageDownloader(QObject *parent) : QObject(parent)
{
	qnam = new QNetworkAccessManager(this);
	connect(qnam, SIGNAL(finished(QNetworkReply *)), SLOT(httpFinished(QNetworkReply *)));
 
	qnam->get(QNetworkRequest(QUrl(basePath)));
}
 
void PageDownloader::httpFinished(QNetworkReply *reply)
{
	QFile file("file.htm");
	if (file.open(QIODevice::WriteOnly))
	{
		file.write(reply->readAll());
		file.flush();
		file.close();
	}
 
	reply->deleteLater();
	reply = 0;
}
 

C++ (Qt)
file.flush();

C++ (Qt)
reply->deleteLater();
reply = 0;

C++ (Qt)
private:
QNetworkAccessManager qnam;
QNetworkReply *reply;

C++ (Qt)
PageDownloader::PageDownloader(QObject *parent) : QObject(parent)
{
reply = qnam.get(QNetworkRequst(QUrl(basePath)));
connect(reply, SIGNAL(finished()), this, SLOT(httpFinished()));
}
 
void PageDownloader::httpFinished()
{
    QFile file("file.htm");
    if (file.open(QIODevice::WriteOnly))
    {
 	file.write(reply->readAll());
	//file.flush(); // нах?
	file.close();
    }
 
    reply->deleteLater();
    //reply = 0; // тут я хз, надо или нет?
}

C++ (Qt)
    QFile file("file.htm");
    if (file.open(QIODevice::WriteOnly))
    {
        reply->readAll();
        file.flush();
        file.close();
    }

C++ (Qt)
{
    QFile file("file.htm");
    if (file.open(QIODevice::WriteOnly))
 	file.write(reply->readAll());
} // Здесь будет вызван деструктор QFile, который закроет файл (close) при этом все буферы вытолкнутся на диск (flush)
 

C++ (Qt)
    reply->readAll();
    QFile file("file.htm");
    if (file.open(QIODevice::WriteOnly))
    {        
        file.flush();
    }