.h

#ifndef WEBPAGESOURCE_H
#define WEBPAGESOURCE_H

#include <QString>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QUrl>

class GetHTMLSource : public QObject
{
    Q_OBJECT

    public:
        GetHTMLSource();
        void GetSource();

    public slots:
        void GetDone(QNetworkReply*);

    private:
        QNetworkAccessManager* NetManager;
};

#endif // WEBPAGESOURCE_H

-------------

.cpp

#include "webpagesource.h"

GetHTMLSource::GetHTMLSource()
{
    NetManager = new QNetworkAccessManager(this);

    connect(NetManager, SIGNAL(finished(QNetworkReply*)),
         this, SLOT(GetDone(QNetworkReply*)));

}

void GetHTMLSource::GetSource()
{
    NetManager->get(QNetworkRequest(QUrl("http://stackoverflow.com")));
}

void GetHTMLSource::GetDone(QNetworkReply* ReplyIn)
{

    QByteArray DataIn=ReplyIn->readAll();
    QString DataString(DataIn);

    //process str any way you like!
}