Connecter un QNetworkAccessManager

**Dereck07** · 24/11/2018, 18h44

Bonjour,

Je suis partie d'un exemple qui fonction parfaitement bien:

http.pro

Code qt-pro :

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QT += network widgets
 
HEADERS += httpwindow.h
SOURCES += httpwindow.cpp \
           main.cpp
FORMS += authenticationdialog.ui
 
# install
target.path = http
INSTALLS += target

httpwindow.h

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#ifndef HTTPWINDOW_H
#define HTTPWINDOW_H
 
#include <QProgressDialog>
#include <QNetworkAccessManager>
#include <QUrl>
 
QT_BEGIN_NAMESPACE
class QFile;
class QLabel;
class QLineEdit;
class QPushButton;
class QSslError;
class QAuthenticator;
class QNetworkReply;
class QCheckBox;
 
QT_END_NAMESPACE
 
class ProgressDialog : public QProgressDialog {
    Q_OBJECT
 
public:
    explicit ProgressDialog(const QUrl &url, QWidget *parent = Q_NULLPTR);
 
public slots:
   void networkReplyProgress(qint64 bytesRead, qint64 totalBytes);
};
 
class HttpWindow : public QDialog
{
    Q_OBJECT
 
public:
    explicit HttpWindow(QWidget *parent = Q_NULLPTR);
 
    void startRequest(const QUrl &requestedUrl);
 
private slots:
    void downloadFile();
    void cancelDownload();
    void httpFinished();
    void httpReadyRead();
    void enableDownloadButton();
    void slotAuthenticationRequired(QNetworkReply*,QAuthenticator *);
#ifndef QT_NO_SSL
    void sslErrors(QNetworkReply*,const QList<QSslError> &errors);
#endif
 
private:
    QFile *openFileForWrite(const QString &fileName);
 
    QLabel *statusLabel;
    QLineEdit *urlLineEdit;
    QPushButton *downloadButton;
    QCheckBox *launchCheckBox;
    QLineEdit *defaultFileLineEdit;
    QLineEdit *downloadDirectoryLineEdit;
 
    QUrl url;
    QNetworkAccessManager qnam;
    QNetworkReply *reply;
    QFile *file;
    bool httpRequestAborted;
};
 
#endif

httpwindow.cpp, cf lignes 95-96

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#include <QtWidgets>
#include <QtNetwork>
#include <QUrl>
 
#include "httpwindow.h"
#include "ui_authenticationdialog.h"
 
#ifndef QT_NO_SSL
static const char defaultUrl[] = "https://www.google.fr";
#else
static const char defaultUrl[] = "https://www.google.fr";
#endif
static const char defaultFileName[] = "index.html";
 
ProgressDialog::ProgressDialog(const QUrl &url, QWidget *parent)
  : QProgressDialog(parent)
{
    setWindowTitle(tr("Download Progress"));
    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
    setLabelText(tr("Downloading %1.").arg(url.toDisplayString()));
    setMinimum(0);
    setValue(0);
    setMinimumDuration(0);
}
 
void ProgressDialog::networkReplyProgress(qint64 bytesRead, qint64 totalBytes)
{
    setMaximum(totalBytes);
    setValue(bytesRead);
}
 
HttpWindow::HttpWindow(QWidget *parent)
    : QDialog(parent)
    , statusLabel(new QLabel(tr("Please enter the URL of a file you want to download.\n\n"), this))
    , urlLineEdit(new QLineEdit(defaultUrl))
    , downloadButton(new QPushButton(tr("Download")))
    , launchCheckBox(new QCheckBox("Launch file"))
    , defaultFileLineEdit(new QLineEdit(defaultFileName))
    , downloadDirectoryLineEdit(new QLineEdit)
/*    , reply(Q_NULLPTR)
    , file(Q_NULLPTR)*/
    , httpRequestAborted(false)
{
    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
    setWindowTitle(tr("HTTP"));
 
    connect(&qnam, &QNetworkAccessManager::authenticationRequired,
            this, &HttpWindow::slotAuthenticationRequired);
#ifndef QT_NO_SSL
    connect(&qnam, &QNetworkAccessManager::sslErrors,
            this, &HttpWindow::sslErrors);
#endif
 
    QFormLayout *formLayout = new QFormLayout;
    urlLineEdit->setClearButtonEnabled(true);
    connect(urlLineEdit, &QLineEdit::textChanged,
            this, &HttpWindow::enableDownloadButton);
    formLayout->addRow(tr("&URL:"), urlLineEdit);
    QString downloadDirectory = QStandardPaths::writableLocation(QStandardPaths::DownloadLocation);
    if (downloadDirectory.isEmpty() || !QFileInfo(downloadDirectory).isDir())
        downloadDirectory = QDir::currentPath();
    downloadDirectoryLineEdit->setText(QDir::toNativeSeparators(downloadDirectory));
    formLayout->addRow(tr("&Download directory:"), downloadDirectoryLineEdit);
    formLayout->addRow(tr("Default &file:"), defaultFileLineEdit);
    launchCheckBox->setChecked(true);
    formLayout->addRow(launchCheckBox);
 
    QVBoxLayout *mainLayout = new QVBoxLayout(this);
    mainLayout->addLayout(formLayout);
 
    mainLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding));
 
    statusLabel->setWordWrap(true);
    mainLayout->addWidget(statusLabel);
 
    downloadButton->setDefault(true);
    connect(downloadButton, &QAbstractButton::clicked, this, &HttpWindow::downloadFile);
    QPushButton *quitButton = new QPushButton(tr("Quit"));
    quitButton->setAutoDefault(false);
    connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close);
    QDialogButtonBox *buttonBox = new QDialogButtonBox;
    buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);
    buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
    mainLayout->addWidget(buttonBox);
 
    urlLineEdit->setFocus();
}
 
void HttpWindow::startRequest(const QUrl &requestedUrl)
{
    url = requestedUrl;
    httpRequestAborted = false;
 
    reply = qnam.get(QNetworkRequest(url));
    connect(reply, &QNetworkReply::finished, this, &HttpWindow::httpFinished);
    connect(reply, &QIODevice::readyRead, this, &HttpWindow::httpReadyRead);
 
    ProgressDialog *progressDialog = new ProgressDialog(url, this);
    progressDialog->setAttribute(Qt::WA_DeleteOnClose);
    connect(progressDialog, &QProgressDialog::canceled, this, &HttpWindow::cancelDownload);
    connect(reply, &QNetworkReply::downloadProgress, progressDialog, &ProgressDialog::networkReplyProgress);
    connect(reply, &QNetworkReply::finished, progressDialog, &ProgressDialog::hide);
    progressDialog->show();
 
    statusLabel->setText(tr("Downloading %1...").arg(url.toString()));
}
 
void HttpWindow::downloadFile()
{
    const QString urlSpec = urlLineEdit->text().trimmed();
    if (urlSpec.isEmpty())
        return;
 
    const QUrl newUrl = QUrl::fromUserInput(urlSpec);
    if (!newUrl.isValid()) {
        QMessageBox::information(this, tr("Error"),
                                 tr("Invalid URL: %1: %2").arg(urlSpec, newUrl.errorString()));
        return;
    }
 
    QString fileName = newUrl.fileName();
    if (fileName.isEmpty())
        fileName = defaultFileLineEdit->text().trimmed();
    if (fileName.isEmpty())
        fileName = defaultFileName;
    QString downloadDirectory = QDir::cleanPath(downloadDirectoryLineEdit->text().trimmed());
    if (!downloadDirectory.isEmpty() && QFileInfo(downloadDirectory).isDir())
        fileName.prepend(downloadDirectory + '/');
    if (QFile::exists(fileName)) {
        if (QMessageBox::question(this, tr("Overwrite Existing File"),
                                  tr("There already exists a file called %1 in "
                                     "the current directory. Overwrite?").arg(fileName),
                                  QMessageBox::Yes|QMessageBox::No, QMessageBox::No)
            == QMessageBox::No)
            return;
        QFile::remove(fileName);
    }
 
    file = openFileForWrite(fileName);
    if (!file)
        return;
 
    downloadButton->setEnabled(false);
 
    // schedule the request
    startRequest(newUrl);
}
 
QFile *HttpWindow::openFileForWrite(const QString &fileName)
{
    QScopedPointer<QFile> file(new QFile(fileName));
    if (!file->open(QIODevice::WriteOnly)) {
        QMessageBox::information(this, tr("Error"),
                                 tr("Unable to save the file %1: %2.")
                                 .arg(QDir::toNativeSeparators(fileName),
                                      file->errorString()));
        return Q_NULLPTR;
    }
    return file.take();
}
 
void HttpWindow::cancelDownload()
{
    statusLabel->setText(tr("Download canceled."));
    httpRequestAborted = true;
    reply->abort();
    downloadButton->setEnabled(true);
}
 
void HttpWindow::httpFinished()
{
    QFileInfo fi;
    if (file) {
        fi.setFile(file->fileName());
        file->close();
        delete file;
        file = Q_NULLPTR;
    }
 
    if (httpRequestAborted) {
        reply->deleteLater();
        reply = Q_NULLPTR;
        return;
    }
 
    if (reply->error()) {
        QFile::remove(fi.absoluteFilePath());
        statusLabel->setText(tr("Download failed:\n%1.").arg(reply->errorString()));
        downloadButton->setEnabled(true);
        reply->deleteLater();
        reply = Q_NULLPTR;
        return;
    }
 
    const QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
 
    reply->deleteLater();
    reply = Q_NULLPTR;
 
    if (!redirectionTarget.isNull()) {
        const QUrl redirectedUrl = url.resolved(redirectionTarget.toUrl());
        if (QMessageBox::question(this, tr("Redirect"),
                                  tr("Redirect to %1 ?").arg(redirectedUrl.toString()),
                                  QMessageBox::Yes | QMessageBox::No) == QMessageBox::No) {
            downloadButton->setEnabled(true);
            return;
        }
        file = openFileForWrite(fi.absoluteFilePath());
        if (!file) {
            downloadButton->setEnabled(true);
            return;
        }
        startRequest(redirectedUrl);
        return;
    }
 
    statusLabel->setText(tr("Downloaded %1 bytes to %2\nin\n%3")
                         .arg(fi.size()).arg(fi.fileName(), QDir::toNativeSeparators(fi.absolutePath())));
    if (launchCheckBox->isChecked())
        QDesktopServices::openUrl(QUrl::fromLocalFile(fi.absoluteFilePath()));
    downloadButton->setEnabled(true);
}
 
void HttpWindow::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
    if (file)
        file->write(reply->readAll());
}
 
void HttpWindow::enableDownloadButton()
{
    downloadButton->setEnabled(!urlLineEdit->text().isEmpty());
}
 
void HttpWindow::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(ui.userEdit->text());
        authenticator->setPassword(ui.passwordEdit->text());
    }
}
 
#ifndef QT_NO_SSL
void HttpWindow::sslErrors(QNetworkReply*,const QList<QSslError> &errors)
{
    QString errorString;
    foreach (const QSslError &error, errors) {
        if (!errorString.isEmpty())
            errorString += '\n';
        errorString += error.errorString();
    }
 
    if (QMessageBox::warning(this, tr("SSL Errors"),
                             tr("One or more SSL errors has occurred:\n%1").arg(errorString),
                             QMessageBox::Ignore | QMessageBox::Abort) == QMessageBox::Ignore) {
        reply->ignoreSslErrors();
    }
}
#endif

main.cpp

Code :

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#include <QApplication>
#include <QDesktopWidget>
#include <QDir>
 
#include "httpwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    HttpWindow httpWin;
    const QRect availableSize = QApplication::desktop()->availableGeometry(&httpWin);
    httpWin.resize(availableSize.width() / 5, availableSize.height() / 5);
    httpWin.move((availableSize.width() - httpWin.width()) / 2, (availableSize.height() - httpWin.height()) / 2);
 
    httpWin.show();
    return app.exec();
}

et authenticationdialog.ui:

Code XML :

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<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Dialog</class>
 <widget class="QDialog" name="Dialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>389</width>
    <height>243</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Http authentication required</string>
  </property>
  <layout class="QGridLayout">
   <item row="0" column="0" colspan="2">
    <widget class="QLabel" name="label">
     <property name="text">
      <string>You need to supply a Username and a Password to access this site</string>
     </property>
     <property name="wordWrap">
      <bool>false</bool>
     </property>
    </widget>
   </item>
   <item row="2" column="0">
    <widget class="QLabel" name="label_2">
     <property name="text">
      <string>Username:</string>
     </property>
    </widget>
   </item>
   <item row="2" column="1">
    <widget class="QLineEdit" name="userEdit"/>
   </item>
   <item row="3" column="0">
    <widget class="QLabel" name="label_3">
     <property name="text">
      <string>Password:</string>
     </property>
    </widget>
   </item>
   <item row="3" column="1">
    <widget class="QLineEdit" name="passwordEdit">
     <property name="echoMode">
      <enum>QLineEdit::Password</enum>
     </property>
    </widget>
   </item>
   <item row="5" column="0" colspan="2">
    <widget class="QDialogButtonBox" name="buttonBox">
     <property name="orientation">
      <enum>Qt::Horizontal</enum>
     </property>
     <property name="standardButtons">
      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
     </property>
    </widget>
   </item>
   <item row="1" column="0">
    <widget class="QLabel" name="label_4">
     <property name="text">
      <string>Site:</string>
     </property>
    </widget>
   </item>
   <item row="1" column="1">
    <widget class="QLabel" name="siteDescription">
     <property name="font">
      <font>
       <weight>75</weight>
       <bold>true</bold>
      </font>
     </property>
     <property name="text">
      <string>%1 at %2</string>
     </property>
     <property name="wordWrap">
      <bool>true</bool>
     </property>
    </widget>
   </item>
   <item row="4" column="0">
    <spacer>
     <property name="orientation">
      <enum>Qt::Vertical</enum>
     </property>
     <property name="sizeHint" stdset="0">
      <size>
       <width>20</width>
       <height>40</height>
      </size>
     </property>
    </spacer>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>buttonBox</sender>
   <signal>accepted()</signal>
   <receiver>Dialog</receiver>
   <slot>accept()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>248</x>
     <y>254</y>
    </hint>
    <hint type="destinationlabel">
     <x>157</x>
     <y>274</y>
    </hint>
   </hints>
  </connection>
  <connection>
   <sender>buttonBox</sender>
   <signal>rejected()</signal>
   <receiver>Dialog</receiver>
   <slot>reject()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>316</x>
     <y>260</y>
    </hint>
    <hint type="destinationlabel">
     <x>286</x>
     <y>274</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>

Le code ci dessus fonctionne parfaitement, J'ai donc voulu le réutiliser en créant le code ci-dessous mais la pas moyen de compiler:

http_issue.pro:

Code qt-pro :

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#-------------------------------------------------
#
# Project created by QtCreator 2018-11-23T19:49:44
#
#-------------------------------------------------
 
QT       += core gui
QT += network
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = http_issue
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp \
    http.cpp
 
HEADERS  += mainwindow.h \
    http.h
 
FORMS    += mainwindow.ui

mainwindow.h

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QIODevice>
#include <QUrl>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
 
#include <QMainWindow>
#include <QStringListModel>
#include <QTimer>
#include <QFile>
#include <QDir>
#include <iostream>     // std::cout
#include <fstream>      // std::ifstream
#include <string>
#include <QDateTime>
 
 
/*QT_BEGIN_NAMESPACE
class QFile;
class QLabel;
class QLineEdit;
class QPushButton;
class QSslError;
class QAuthenticator;
class QNetworkReply;
class QCheckBox;
 
QT_END_NAMESPACE*/
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QNetworkAccessManager *manager2;
 
public slots:
    void httpFinished2(QNetworkReply *);
    void httpReadyRead2(QIODevice *);
private:
    Ui::MainWindow *ui;
 
 
};
 
#endif // MAINWINDOW_H

mainwindow.cpp, cf lignes 15-18 :

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#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
 
    std::string link = "https://www.google.fr";
    manager2 = new QNetworkAccessManager;
    manager2->get(QNetworkRequest(QUrl(QString::fromStdString(link))));
 
//fonctionne
//connect(manager2, SIGNAL(finished(QNetworkReply *)), this, SLOT(httpFinished2(QNetworkReply *)));
    // create an error
connect(manager2, &QNetworkReply::finished, this, &MainWindow::httpFinished2);
 
//  connect(manager2, SIGNAL(readyRead(QIODevice *)), this, SLOT(httpReadyRead2(QIODevice *)));
//  connect(manager2, &QIODevice::readyRead, this, &MainWindow::httpReadyRead);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::httpReadyRead2(QIODevice *reply)
{
    // 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
//    if (file)
//        file->write(reply->readAll());
}
 
void MainWindow::httpFinished2(QNetworkReply *reply)
{
    QString html = reply->readAll();
    ui->textBrowser->append(html);
}

main.cpp

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#include "mainwindow.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    return a.exec();
}

mainwindow.ui

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<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <widget class="QTextBrowser" name="textBrowser">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>10</y>
      <width>371</width>
      <height>231</height>
     </rect>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menuBar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>400</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QToolBar" name="mainToolBar">
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

Quand je complie le code avec le:

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connect(manager2, &QNetworkReply::finished, this, &MainWindow::httpFinished2);

J'ai l'erreur suivante

D:\software\projet\http_issue\http_issue\mainwindow.cpp:16: erreur : no matching function for call to 'MainWindow::connect(QNetworkAccessManager*&, void (QNetworkReply::*)(), MainWindow*, void (MainWindow::*)(QNetworkReply*))'
connect(manager2, &QNetworkReply::finished, this, &MainWindow::httpFinished2);

^
Et je ne comprend vraimant pas puisque ca fonctionne parfaitement avec le code exemple (lignes 85-96 dans httpwindow.cpp du premier exemple)...
Quelqu'un comprend pourquoi ?

Invité · 24/11/2018, 20h17

Bonsoir,

Tu as commis une petite erreur :

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connect(manager2, &QNetworkReply::finished, this, &MainWindow::httpFinished2);

manager2 n'est pas un pointeur vers le type QNetworkReply comme l'était le reply du premier projet, mais de type QNetworkAccessManager* ici.
Vient donc :

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1
2
connect(manager2, &QNetworkAccessManager::finished, this, &MainWindow::httpFinished2);
                   ^^^^^^^^^^^^^^^^^^^^^

Le connect(manager2, SIGNAL(finished(QNetworkReply *)), this, SLOT(httpFinished2(QNetworkReply *))); avec l'ancienne syntaxe fonctionne, car le QNetworkReply* mentionné est ici le type du paramètre du signal qui est transmis au slot, pas celui de manager2.

**Dereck07** · 24/11/2018, 21h15

Merci Beaucoup !!

tu ne peux pas savoir le temps que j'ai passé sur ce code à essayer de le recompiler dans tout les senses et quand on a la solution on se dit comment j'ai fait pour ne pas le voir... lol

En tout cas encor merci !!

Je laisse la discussion ouverte car j'avais un autre souci mais avec ce que tu m'as donnés il va peut être se résoudre. (je vais cherche un peu. Si je ne trouve pas je l'ajouterai à cette discussion)

Grand merci !!

**Dereck07** · 25/11/2018, 16h31

Re-Bonsoir Winjerome,

En fait, initialement essayais d’implémenter QNetworkAccessManager dans une class et comme ça ne marchait pas j'avais ensuite essayé directement dans le MainWindow.
Avec ce que tu m'as donné hier et qui marche bien dans la class MainWindow j'ai essayé d’implémenter la class http:

http.h:

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#ifndef HTTP_H
#define HTTP_H
 
#include <QFile>
#include <QMessageBox>
#include <QtWidgets>
#include <QtNetwork>
 
#include <QProgressDialog>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QIODevice>
#include <QUrl>
 
#include <QMainWindow>
#include <QStringListModel>
#include <QTimer>
#include <QFile>
#include <QDir>
#include <iostream>     // std::cout
#include <fstream>      // std::ifstream
#include <string>
#include <QDateTime>
 
 
QT_BEGIN_NAMESPACE
class QFile;
class QLabel;
class QLineEdit;
class QPushButton;
class QSslError;
class QAuthenticator;
class QNetworkReply;
class QCheckBox;
 
QT_END_NAMESPACE
 
class http
{
QTextBrowser *textBrowser;
public:
    QNetworkAccessManager *manager2;
    QNetworkReply *reply2;
    http(QTextBrowser *textBrowser_);
    void startRequest(const QUrl &requestedUrl);
    void download_html(QString urlSpec, QString filepath );
public slots:
    void httpFinished3();
    void httpReadyRead3();
};
 
#endif // HTTP_H

http.cpp, cf. lignes 12 et 13

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#include "http.h"
 
http::http(QTextBrowser *textBrowser_)
{
textBrowser=textBrowser_;
textBrowser->append(QString::fromStdString("called http::http(MainWindow *MainWin_)"));
 
    std::string link = "https://www.google.fr";
    manager2 = new QNetworkAccessManager;
    reply2 = manager2->get(QNetworkRequest(QUrl(QString::fromStdString(link))));
 
    connect(reply2, &QNetworkReply::finished, this, &http::httpFinished3);
    connect(reply2, &QIODevice::readyRead, this, &http::httpReadyRead3);
}
 
void http::httpFinished3()
{
    QString html = reply2->readAll();
    textBrowser->append(html);
}
 
void http::httpReadyRead3()
{
 
}

http_issue.pro

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#-------------------------------------------------
#
# Project created by QtCreator 2018-11-23T19:49:44
#
#-------------------------------------------------
 
QT       += core gui
QT += network
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = http_issue
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp \
    http.cpp
 
HEADERS  += mainwindow.h \
    http.h
 
FORMS    += mainwindow.ui

mainwindow.h:

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QIODevice>
#include <QUrl>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
 
#include <QMainWindow>
#include <QStringListModel>
#include <QTimer>
#include <QFile>
#include <QDir>
#include <iostream>     // std::cout
#include <fstream>      // std::ifstream
#include <string>
#include <QDateTime>
#include "http.h"
 
/*QT_BEGIN_NAMESPACE
class QFile;
class QLabel;
class QLineEdit;
class QPushButton;
class QSslError;
class QAuthenticator;
class QNetworkReply;
class QCheckBox;
 
QT_END_NAMESPACE*/
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    http *http_module;
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QNetworkAccessManager *manager2;
    QNetworkReply *reply2;
public slots:
    void httpFinished3();
    void httpReadyRead3();
private:
    Ui::MainWindow *ui;
 
 
};
 
#endif // MAINWINDOW_H

mainwindow.cpp

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#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
 
    http_module = new http(ui->textBrowser);
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}

mainwindow.ui

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<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <widget class="QTextBrowser" name="textBrowser">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>11</y>
      <width>381</width>
      <height>301</height>
     </rect>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menuBar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>400</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QToolBar" name="mainToolBar">
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

Quand j'essaie de compiler j'ai l'erreur suivante:

D:\software\projet\http_issue2\http_issue\http.cpp:12: erreur : invalid conversion from 'QNetworkReply*' to 'SOCKET {aka unsigned int}' [-fpermissive]
     connect(reply2, &QNetworkReply::finished, this, &http::httpFinished3);
                                                                         ^
D:\software\projet\http_issue2\http_issue\http.cpp:12: erreur : cannot convert 'void (QNetworkReply::*)()' to 'const sockaddr*' for argument '2' to 'int connect(SOCKET, const sockaddr*, int)'
D:\software\projet\http_issue2\http_issue\http.cpp:13: erreur : invalid conversion from 'QNetworkReply*' to 'SOCKET {aka unsigned int}' [-fpermissive]
     connect(reply2, &QIODevice::readyRead, this, &http::httpReadyRead3);
                                                                       ^
D:\software\projet\http_issue2\http_issue\http.cpp:13: erreur : cannot convert 'void (QIODevice::*)()' to 'const sockaddr*' for argument '2' to 'int connect(SOCKET, const sockaddr*, int)'

Je ne comprends pas car ce code fonctionne dans la class MainWindow et j'ai copié collé le code dans la class http: Implémenter dans sa propre classe ça ne veut plus compiler...
Stp, verrais tu ce qui cloche ?

Invité · 25/11/2018, 16h49

Afin de pouvoir utiliser les signaux et slots, ta classe http doit hériter de la classe QObject (ou de l'une de ses classes dérivées) et avoir la macro Q_OBJECT.

Ici, étant donné que ta classe n'hérite pas de la classe QObject, elle ne possède pas la fonction membre connect(), et la seule fonction connect() que parvient à trouver le compilateur, c'est la fonction connect en relation avec les sockets. Et comme tu le vois, il a un peu de mal à faire le lien entre les paramètres que tu lui fournis et ceux que cette fonction attend

.

**Dereck07** · 25/11/2018, 17h09

Je ne savais pas cela...

Un infini remerciement !!

Connecter un QNetworkAccessManager

Réseau

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