Pass signals and data from a class to another on Qt - c++

Question

I will post the code first as it will be easier to understand after that.
Basically, I have a default class, MainWindow:
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QDebug>
#include "tcpsocket.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
//This is my class
tcpsocket *socket;
public slots:
void updateUI(QString);
private slots:
void on_connectButton_clicked();
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::updateUI(QString msg)
{
qDebug() << "GOOD, SLOT ACCESSED FROM ANOTHER CLASS";
ui->responseBox->setText(msg);
}
void MainWindow::on_connectButton_clicked()
{
socket = new tcpsocket();
socket->doConnect();
}
Behind is a simple form with a pushButton and a textBox.
And the second class:
tcpsocket.h
#ifndef TCPSOCKET_H
#define TCPSOCKET_H
#include <QMainWindow>
#include <QObject>
#include <QTcpSocket>
#include <QAbstractSocket>
#include <QBitArray>
#include <QDebug>
#include "mainwindow.h"
class tcpsocket : public QMainWindow
{
Q_OBJECT
public:
explicit tcpsocket(QWidget *parent = 0);
void doConnect();
signals:
public slots:
void connected();
void disconnected();
void bytesWritten(qint64 bytes);
void readyRead();
private:
QTcpSocket *socket;
};
#endif // TCPSOCKET_H
and tcpsocket.cpp
#include "tcpsocket.h"
tcpsocket::tcpsocket(QWidget *parent) : QMainWindow(parent)
{
}
void tcpsocket::doConnect()
{
socket = new QTcpSocket(this);
connect(socket, SIGNAL(connected()),this, SLOT(connected()));
connect(socket, SIGNAL(disconnected()),this, SLOT(disconnected()));
connect(socket, SIGNAL(bytesWritten(qint64)),this, SLOT(bytesWritten(qint64)));
connect(socket, SIGNAL(readyRead()),this, SLOT(readyRead()));
//And here I want to add a signal to a slor from main window.
//Something like this:
// connect(socket, SIGNAL(readyRead()), MainWindow, SLOT(updateUI());
qDebug() << "connecting...";
// this is not blocking call
socket->connectToHost("google.com", 80);
// we need to wait...
if(!socket->waitForConnected(5000))
{
qDebug() << "Error: " << socket->errorString();
}
}
void tcpsocket::connected()
{
qDebug() << "connected...";
// Hey server, tell me about you.
socket->write("HEAD / HTTP/1.0\r\n\r\n\r\n\r\n");
}
void tcpsocket::disconnected()
{
qDebug() << "disconnected...";
}
void tcpsocket::bytesWritten(qint64 bytes)
{
qDebug() << bytes << " bytes written...";
}
void tcpsocket::readyRead()
{
qDebug() << "reading response...";
QString data = socket->readAll();
qDebug() << data;
//Here, I want to pass somehow this content to function updateUI, from MainWindow
// MainWindow::updateUI( data );
}
Bsically, I want to pass some data from class tcpsocket to class MainWindow
main.cpp is default code. I think it is not relevant.
To be more specific, I want that a signal from tcpsocket class to trigger a slot from MainWindow class:
void tcpsocket::doConnect()
{
socket = new QTcpSocket(this);
//local slots
connect(socket, SIGNAL(connected()),this, SLOT(connected()));
connect(socket, SIGNAL(disconnected()),this, SLOT(disconnected()));
connect(socket, SIGNAL(bytesWritten(qint64)),this, SLOT(bytesWritten(qint64)));
connect(socket, SIGNAL(readyRead()),this, SLOT(readyRead()));
//And here I want to add a signal to a slot from main window.
//Something like this:
// connect(socket, SIGNAL(readyRead()), MainWindow, SLOT(updateUI());
....
And the second question is how to pass some data from tcpsocket class to MainWindow class:
void tcpsocket::readyRead()
{
qDebug() << "reading response...";
QString data = socket->readAll();
qDebug() << data;
//Here, I want to pass somehow this content to function updateUI, from MainWindow
// MainWindow::updateUI( data );
}
The application run perfectly and content is fetched. But I can view the fetched content only using qDebug(); so I want to pass response to GUI, into a textBox.