Downloading a page with QNetworkAccessManager

[TempleClause]

Hello,

I'm trying to download a webpage using the QNetworkAccessManager but I always get strange build errors..

Here is my code:

#include <QtCore/QCoreApplication>
#include "downloadpage.h"
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    DownloadPage downloadPage;
    downloadPage.startDownload();
 
    return a.exec();
}

#include <QtCore/QCoreApplication>
#include "downloadpage.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    
    DownloadPage downloadPage;
    downloadPage.startDownload();

    return a.exec();
}

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#ifndef DOWNLOADPAGE_H
#define DOWNLOADPAGE_H
 
#include <Qt/QtNetwork>
#include <QDebug>
 
class DownloadPage:QObject
{
    Q_OBJECT
 
public:
    DownloadPage();
    void startDownload();
 
private slots:
    void downloadComplete(QNetworkReply *reply);
 
private:
    QNetworkAccessManager *manager;
};
 
#endif // DOWNLOADPAGE_H

#ifndef DOWNLOADPAGE_H
#define DOWNLOADPAGE_H

#include <Qt/QtNetwork>
#include <QDebug>

class DownloadPage:QObject
{
    Q_OBJECT

public:
    DownloadPage();
    void startDownload();

private slots:
    void downloadComplete(QNetworkReply *reply);

private:
    QNetworkAccessManager *manager;
};

#endif // DOWNLOADPAGE_H

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#include "downloadpage.h"
 
DownloadPage::DownloadPage()
{
    qDebug()<<"Download Page constructor called";
    manager = new QNetworkAccessManager(this);
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(downloadComplete(QNetworkReply*)));
}
 
void DownloadPage::startDownload(){
    qDebug()<<"Downloading Page...";
    manager->get(QNetworkRequest(QUrl("http://www.google.ch")));
    qDebug()<<"Page call end but not finished yet";
}
 
void DownloadPage::downloadComplete(QNetworkReply *reply){
    qDebug()<<"Page call finished";
}

#include "downloadpage.h"

DownloadPage::DownloadPage()
{
    qDebug()<<"Download Page constructor called";
    manager = new QNetworkAccessManager(this);
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(downloadComplete(QNetworkReply*)));
}

void DownloadPage::startDownload(){
    qDebug()<<"Downloading Page...";
    manager->get(QNetworkRequest(QUrl("http://www.google.ch")));
    qDebug()<<"Page call end but not finished yet";
}

void DownloadPage::downloadComplete(QNetworkReply *reply){
    qDebug()<<"Page call finished";
}

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and my build errors are:

debug/downloadpage.o: In function `DownloadPage':
D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:6: undefined reference to `_imp___ZN21QNetworkAccessManagerC1EP7QObject'
D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:6: undefined reference to `_imp___ZN21QNetworkAccessManagerC1EP7QObject'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN15QNetworkRequestC1ERK4QUrl'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN21QNetworkAccessManager3getERK15QNetworkRequest'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN15QNetworkRequestD1Ev'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN15QNetworkRequestD1Ev'
collect2: ld returned 1 exit status
mingw32-make.exe[1]: *** [debug\ComeOn.exe] Error 1
mingw32-make.exe: *** [debug] Error 2
21:36:03: The process "D:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project ComeOn (target: Desktop)
When executing build step 'Make'

debug/downloadpage.o: In function `DownloadPage':
D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:6: undefined reference to `_imp___ZN21QNetworkAccessManagerC1EP7QObject'
D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:6: undefined reference to `_imp___ZN21QNetworkAccessManagerC1EP7QObject'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN15QNetworkRequestC1ERK4QUrl'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN21QNetworkAccessManager3getERK15QNetworkRequest'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN15QNetworkRequestD1Ev'
debug/downloadpage.o:D:\Desktop\ComeOn-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug/../ComeOn/downloadpage.cpp:12: undefined reference to `_imp___ZN15QNetworkRequestD1Ev'
collect2: ld returned 1 exit status
mingw32-make.exe[1]: *** [debug\ComeOn.exe] Error 1
mingw32-make.exe: *** [debug] Error 2
21:36:03: The process "D:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project ComeOn (target: Desktop)
When executing build step 'Make'

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Does anybody have an idea?

Thanks!

[Rhayader]

Just add

QT += network

QT += network

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in your .pro file

[TempleClause]

many many thanks!