Can't download HTML of website

El3ctroGh0st

Hey,

so this is the source code of my class that should download the HTML of a specific web page:

//xmlparser.hpp
#ifndef XMLPARSER_HPP
#define XMLPARSER_HPP

#include <QNetworkReply>
#include <QObject>
#include <QUrl>

class XMLParser : public QObject
{
    Q_OBJECT
public:
    explicit XMLParser(QObject *parent = 0) {}
    XMLParser(QUrl link, QObject *parent = 0) : downloadLink(link) {}

    QString getContent() const { return downloadData; }
    void downloadXML();

public slots:
    void readContent(QNetworkReply *);

private:
    QUrl downloadLink;
    QString downloadData;
};

#endif // XMLPARSER_HPP

//xmlparser.cpp
#include "xmlparser.hpp"

#include <QDebug>
#include <QNetworkAccessManager>
#include <QNetworkRequest>

void XMLParser::downloadXML()
{
    QNetworkRequest qreq(downloadLink);
    QNetworkAccessManager *qmanag = new QNetworkAccessManager(this);

    connect(qmanag, &QNetworkAccessManager::finished, this, XMLParser::readContent);

    qmanag->get(qreq);
}

void XMLParser::readContent(QNetworkReply *qrep)
{
    QByteArray content;
    content = qrep->readAll();
    downloadData = QString(content);

    if(qrep->error() == QNetworkReply::NoError)
        qDebug() << "No error";
    qDebug() << downloadData;
}

So far so good. In another class I call the following:

    XMLParser *pars = new XMLParser(QUrl("https://forum.qt.io/category/10/general-and-desktop"), this);
    pars->downloadXML();

When I run this the program prints "No error", which leads me to believe that network-wise everything is working. However, it seems that downloadData is completely empty because it doesn't print anything at all. Anyone knows what I might've done wrong?
EDIT: Actually no, it seems that the problem is just that I can't print such large strings into QDebug. Because if I print downloadData[0] it works, However, I'll still keep it open in the hope that someone can help me with the issue below.

(On a sidenote. I keep getting the warning that parent is an unused parameter. Is that something I can ignore or did I do something wrong in the way I configured the constructors?)

Pablo J. Rogina

@El3ctroGh0st three things here.

What happens with my network-based application? Wireshark is always your friend to know exactly what your application is sending/receiving from/to the network.
Regarding parent is an unused parameter, try using the parent you receive in the constructor into the QObject constructor:

XMLParser(QUrl link, QObject *parent = 0) : QObject(parent), downloadLink(link) {}

Try not to hijaack the topic of your post with several subjects inside it :-)
You started with the network issue, but you have the parent issue as well