QT: unresolved external symbol while trying to get webpage source code - qt

Question

I started developing with Qt and I'm trying to get webpage source code. Here's what I have :
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QString>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QUrl>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
/**/
class GetHTMLSource : public QObject
{
Q_OBJECT
public:
GetHTMLSource();
void GetSource();
public slots:
void GetDone(QNetworkReply*);
private:
QNetworkAccessManager* NetManager;
};
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!
}
/**/
void MainWindow::on_pushButton_clicked()
{
GetHTMLSource Test;
Test.GetSource();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_pushButton_clicked();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
.pro
QT += core gui
TARGET = TestGetPageSource
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
QT += network
Errors are :
mainwindow.obj:-1: error:LNK2001: unresolved external symbol "public:
virtual struct QMetaObject const * __thiscall
GetHTMLSource::metaObject(void)const "
(?metaObject#GetHTMLSource##UBEPBUQMetaObject##XZ)
mainwindow.obj:-1: error:LNK2001: unresolved external symbol "public:
virtual void * __thiscall GetHTMLSource::qt_metacast(char const *)"
(?qt_metacast#GetHTMLSource##UAEPAXPBD#Z)
mainwindow.obj:-1: error:LNK2001: unresolved external symbol "public:
virtual int __thiscall GetHTMLSource::qt_metacall(enum
QMetaObject::Call,int,void * *)"
(?qt_metacall#GetHTMLSource##UAEHW4Call#QMetaObject##HPAPAX#Z)

Answer 1

Generally if you create classes derived from QObject you have to put them in separate header and source files.
So one .h and one .cpp file for one class.

Answer 2

Fixed it on my own. Of course it was my stupid mistake.
In class definition :
public slots:
void GetDone(QNetworkReply*);
was not matching actual function :
void GetHTMLSource::GetDone(QNetworkReply* ReplyIn)
{ ... }
However moving it to seperated .h and .cpp files probably helped.