Code copied from 'http' example has issues

AI_Messiah

When I copied the code from the example into my own project I found that
#include <QtNetwork> has to be #include <QtNetwork/QtNetwork> and #include <QNetworkAccessManager> has to be #include <QtNetwork/QNetworkAccessManager> the 'connect' method in the http events wants to be derived from a class and I get an error in a file that I will not be ready to understand for ten years some 'meta object thing'

the header is

#ifndef GETHTML_H
#define GETHTML_H
#include <QProgressDialog>
#include <QtNetwork/QNetworkAccessManager>
#include <QUrl>
#include <memory>
class gethtml
{
public:
    gethtml();
    QString htmlContent;
    QString errorText;
    QString user;
    QString password;
    bool haslod;
    void downloadFile(QString myurl);
    //QVector<QChar> binContent;
private slots:
    void startRequest(const QUrl &requestedUrl);
    void httpFinished();
    void httpReadyRead();
    void sslErrors(const QList<QSslError> &errors);
    void slotAuthenticationRequired(QNetworkReply *, QAuthenticator *authenticator);
private:
    QUrl url;
    QNetworkAccessManager qnam;
    QScopedPointer<QNetworkReply, QScopedPointerDeleteLater> reply;
    bool httpRequestAborted = false;
};

#endif // GETHTML_H

the source is


#include "gethtml.h"




#include <QtNetwork/QtNetwork>
#include <QUrl>

#include <algorithm>
#include <memory>

//#if QT_CONFIG(ssl)
gethtml::gethtml(){
QNetworkAccessManager::connect(&qnam, &QNetworkAccessManager::authenticationRequired,
        this, &gethtml::slotAuthenticationRequired);
}
void gethtml::startRequest(const QUrl &requestedUrl)
{
    url = requestedUrl;
    httpRequestAborted = false;

    //! [qnam-download]
    reply.reset(qnam.get(QNetworkRequest(url)));
    //! [qnam-download]
    //! [connecting-reply-to-slots]
    connect(reply.get(), &QNetworkReply::finished, this, &gethtml::httpFinished);
    //! [networkreply-readyread-1]
    connect(reply.get(), &QIODevice::readyRead, this, &gethtml::httpReadyRead);
    //! [networkreply-readyread-1]
#if QT_CONFIG(ssl)
    //! [sslerrors-1]
    connect(reply.get(), &QNetworkReply::sslErrors, this, &gethtml::sslErrors);
    //! [sslerrors-1]
#endif
    //! [connecting-reply-to-slots]

errorText = "";
haslod = false;





//    statusLabel->setText(tr("Downloading %1...").arg(url.toString()));
}

void gethtml::downloadFile(QString myurl)
{
    const QString urlSpec = myurl.trimmed();
    if (urlSpec.isEmpty())
        return;

    const QUrl newUrl = QUrl::fromUserInput(urlSpec);
    if (!newUrl.isValid()) {

        return;
    }





    // schedule the request
    startRequest(newUrl);
}





void gethtml::httpFinished()
{


    //! [networkreply-error-handling-1]
    QNetworkReply::NetworkError error = reply->error();
    const QString &errorString = reply->errorString();
    //! [networkreply-error-handling-1]
    reply.reset();
    //! [networkreply-error-handling-2]
    if (error != QNetworkReply::NoError) {

        // For "request aborted" we handle the label and button in cancelDownload()
        if (!httpRequestAborted) {
            errorText = reply->error();

        }
        return;
    }
    //! [networkreply-error-handling-2]

    //statusLabel->setText(tr("Downloaded %1 bytes to %2\nin\n%3"));

   // if (launchCheckBox->isChecked())
    //    QDesktopServices::openUrl(QUrl::fromLocalFile(fi.absoluteFilePath()));
    //downloadButton->setEnabled(true);
    haslod = true;
}

//! [networkreply-readyread-2]
void gethtml::httpReadyRead()
{
    // This slot gets called every time the QNetworkReply has new data.
    // We read all of its new data and write it into the file.
    // That way we use less RAM than when reading it at the finished()
    // signal of the QNetworkReply

        htmlContent += reply->readAll();

}
//! [networkreply-readyread-2]



//! [qnam-auth-required-2]
void gethtml::slotAuthenticationRequired(QNetworkReply *, QAuthenticator *authenticator)
{
   // QDialog authenticationDialog;
    //Ui::Dialog ui;
    //ui.setupUi(&authenticationDialog);
    //authenticationDialog.adjustSize();
    //ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm(), url.host()));

    // Did the URL have information? Fill the UI.
    // This is only relevant if the URL-supplied credentials were wrong
    //ui.userEdit->setText(url.userName());
    //ui.passwordEdit->setText(url.password());

    //if (authenticationDialog.exec() == QDialog::Accepted) {
        authenticator->setUser(user);
        authenticator->setPassword(password);
  //  }
}
//! [qnam-auth-required-2]

//#if QT_CONFIG(ssl)
//! [sslerrors-2]
void gethtml::sslErrors(const QList<QSslError> &errors)
{
    QString errorString = "";
    for (const QSslError &error : errors) {
        if (!errorString.isEmpty())
            errorString += '\n';
        errorString += error.errorString();
    }
    errorText = errorString;

        //reply->ignoreSslErrors();

}
//! [sslerrors-2]
//#endif

I hope someone can help me.

Christian Ehrlicher

@AI_Messiah said in Code copied from 'http' example has issues:

When I copied the code from the example into my own project I found that

You forgot to add the QtNetwork module as described in the documentation and the example also for sure has this line in the .pro-file

qmake: QT += network

AI_Messiah

Actually I did insert this 'QT += network' in the project file

Christian Ehrlicher

@AI_Messiah Then the compiler and linker will also use the correct include paths and libs. Don't forget to rerun qmake and you modified the correct pro file.

JonB

@AI_Messiah said in Code copied from 'http' example has issues:

and I get an error in a file that I will not be ready to understand for ten years some 'meta object thing'

After you have followed @Christian-Ehrlicher's instructions to rebuild thoroughly, if you still get this error you should paste it rather than giving us your interpretation! :)

Mr_Ada

I was hoping to see a solution here. I have been working on the https example and for me authentication doesn't seem to work and I know I am accessing a site that needs a log in (MyFitnessPal). The slot never gets called.

Christian Ehrlicher

@Mr_Ada Don't see what this has to do with your initial issue...

Mr_Ada

@Christian-Ehrlicher Sorry for the late response. I just saw the notification today. I am trying to communicate with MyFitnessPal using HTTP example from QT and the authentication signal never gets triggered. I don't know if it is me or maybe the openssl package I have installed or am using. Seems to not work in Windows or Android. So basically I am saying I did all that was said here but I still cannot communicate with MyFitnessPal. Could be something I am just not missing. I know that MFP uses OAuth and so does Qt so maybe I am not using the right link?