Access a member/widget of one class from a different class.

[Puneet2793]

Hi I Have two different classes one is window whose base class is QWidget and another is socket whose base class is QObject. I have few widgets like reset and exit button and a text browser in main window. On other side I have a socket code which keeps on listening on a port. What I am trying to achieve is whenever a new client connects to the sever, display that client message on the mainwindow Textbrowser widget. But due to lack of knowledge in c++ as I am still learning it, I couldn't get this working. here is the code.
here is main.cpp

#include <QApplication>
#include "window.h"
#include "socket.h"
 
int main(int argc, char **argv)
{
 QApplication app (argc, argv);
 Window window;
 Socket socket;
 
 window.setStyleSheet("background-color: rgb(226, 226, 226);");
 window.showFullScreen();
 return app.exec();
}

#include <QApplication>
#include "window.h"
#include "socket.h"

int main(int argc, char **argv)
{
 QApplication app (argc, argv);
 Window window;
 Socket socket;

 window.setStyleSheet("background-color: rgb(226, 226, 226);");
 window.showFullScreen();
 return app.exec();
}

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here is window.h

#ifndef WINDOW_H
#define WINDOW_H
 
#include <QWidget>
 
class QPushButton;
class QTextBrowser;
class QString;
 
class Window : public QWidget
{
    Q_OBJECT
 
public:
    explicit Window(QWidget *parent = 0);
 
    QPushButton *helloButton;
    QPushButton *exitButton;
    QPushButton *resetButton;
    QTextBrowser *clientMsgWindow;
 
public slots:
    void reset();
    void setClientWindow(QString str);
};
#endif // WINDOW_H

#ifndef WINDOW_H
#define WINDOW_H

#include <QWidget>

class QPushButton;
class QTextBrowser;
class QString;

class Window : public QWidget
{
    Q_OBJECT

public:
    explicit Window(QWidget *parent = 0);

    QPushButton *helloButton;
    QPushButton *exitButton;
    QPushButton *resetButton;
    QTextBrowser *clientMsgWindow;

public slots:
    void reset();
    void setClientWindow(QString str);
};
#endif // WINDOW_H

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this is window.cpp

#include "window.h"
#include <QPushButton>
#include <QTextBrowser>
#include <QDebug>
#include <QString>
 
Window::Window(QWidget *parent) : QWidget(parent)
{
    /****************** Hello BUTTON ********************/
    helloButton = new QPushButton(this);
    helloButton->setIconSize(QSize(145, 145));
    helloButton->setGeometry(15, 160, 145, 145);
    helloButton->setText("Hello World");
 
    /******************reset BUTTON ********************/
    resetButton = new QPushButton(this);
    resetButton->setIconSize(QSize(145, 145));
    resetButton->setGeometry(15, 160, 145, 145);
    resetButton->setText("Click to Reset");
 
    /************* EXIT BUTTON *********************/
    exitButton = new QPushButton(this);
    exitButton->setIcon(QIcon(":/new/prefix1/images/exit.png"));
    exitButton->setIconSize(QSize(145, 145));
    exitButton->setGeometry(635, 10, 145, 145);
    exitButton->setText("EXIT");
    //exitButton->setStyleSheet("background-color: rgb(236, 236, 236);");
    // Signal and slot for EXIT button
    qDebug() << connect(exitButton, SIGNAL (clicked()), this, SLOT (close()));
 
    /*************** TEXT BROWSER *********************/
    clientMsgWindow = new QTextBrowser(this);
    clientMsgWindow->setMinimumSize(QSize(0,0));
    clientMsgWindow->setMaximumSize(QSize(10000,10000));
    clientMsgWindow->setGeometry(175, 50, 440, 420);
    clientMsgWindow->setStyleSheet("background-color: rgb(236, 236, 236);");
}
 
void Window::setClientWindow(QString Str)
{
    qDebug() << "Hit in Set client window to set Text";
    qDebug() << Str;
    clientMsgWindow->setText("This is the message from client");
    clientMsgWindow->setText(Str);
    qDebug() << "Setting text done";
}
 
/**** Slot to reset the text browser **********/
void Window::reset()
{
    qDebug() << "Process in Reset Window";
    clientMsgWindow->clear();
 
}

#include "window.h"
#include <QPushButton>
#include <QTextBrowser>
#include <QDebug>
#include <QString>

Window::Window(QWidget *parent) : QWidget(parent)
{
    /****************** Hello BUTTON ********************/
    helloButton = new QPushButton(this);
    helloButton->setIconSize(QSize(145, 145));
    helloButton->setGeometry(15, 160, 145, 145);
    helloButton->setText("Hello World");

    /******************reset BUTTON ********************/
    resetButton = new QPushButton(this);
    resetButton->setIconSize(QSize(145, 145));
    resetButton->setGeometry(15, 160, 145, 145);
    resetButton->setText("Click to Reset");

    /************* EXIT BUTTON *********************/
    exitButton = new QPushButton(this);
    exitButton->setIcon(QIcon(":/new/prefix1/images/exit.png"));
    exitButton->setIconSize(QSize(145, 145));
    exitButton->setGeometry(635, 10, 145, 145);
    exitButton->setText("EXIT");
    //exitButton->setStyleSheet("background-color: rgb(236, 236, 236);");
    // Signal and slot for EXIT button
    qDebug() << connect(exitButton, SIGNAL (clicked()), this, SLOT (close()));

    /*************** TEXT BROWSER *********************/
    clientMsgWindow = new QTextBrowser(this);
    clientMsgWindow->setMinimumSize(QSize(0,0));
    clientMsgWindow->setMaximumSize(QSize(10000,10000));
    clientMsgWindow->setGeometry(175, 50, 440, 420);
    clientMsgWindow->setStyleSheet("background-color: rgb(236, 236, 236);");
}

void Window::setClientWindow(QString Str)
{
    qDebug() << "Hit in Set client window to set Text";
    qDebug() << Str;
    clientMsgWindow->setText("This is the message from client");
    clientMsgWindow->setText(Str);
    qDebug() << "Setting text done";
}

/**** Slot to reset the text browser **********/
void Window::reset()
{
    qDebug() << "Process in Reset Window";
    clientMsgWindow->clear();

}

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this is socket.h

#ifndef SOCKET_H
#define SOCKET_H
 
#include <QObject>
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>
#include <window.h>
 
class QTextBrowser;
 
class Socket : public QObject
{
    Q_OBJECT
public:
    explicit Socket(QObject *parent = 0);
    void setWindow(Window *w);
signals:
 
public slots:
    void newConnection();
 
private:
        QTcpServer *server;
        Window *window;
};
 
#endif // SOCKET_H

#ifndef SOCKET_H
#define SOCKET_H

#include <QObject>
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>
#include <window.h>

class QTextBrowser;

class Socket : public QObject
{
    Q_OBJECT
public:
    explicit Socket(QObject *parent = 0);
    void setWindow(Window *w);
signals:

public slots:
    void newConnection();

private:
        QTcpServer *server;
        Window *window;
};

#endif // SOCKET_H

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this is socket.cpp

#include "socket.h"
#include "window.h"
#include <QWidget>
#include <QString>
 
Socket::Socket(QObject *parent):
    QObject(parent)
{
    server = new QTcpServer(this);
    connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
    if(!server->listen(QHostAddress::QHostAddress("192.168.0.1"), 5000)){
        qDebug() << "SERVER NOT STARTED";
    }
    else{
        qDebug() << "SERVER STARTED";
    }
}
 
void Socket::newConnection()
{
    QString clientMsg ;
    QTcpSocket *socket= server->nextPendingConnection();
    socket->write("Server Running on 192.168.0.1");
    socket->flush();
    socket->waitForBytesWritten();
 
    // Recieve the data from Client
    socket->waitForReadyRead();
    qDebug() << (clientMsg = socket->readAll());
 
    connect((socket, SIGNAL (readyRead)), Window::clientMsgWindow, SLOT(setClientWindow)); /*********** can I use signal and slot ************/
    //Window pWindow;         /********* tried using this but GUI crash ************/
    //pWindow->setClientWindow(clientMsg);
}

#include "socket.h"
#include "window.h"
#include <QWidget>
#include <QString>

Socket::Socket(QObject *parent):
    QObject(parent)
{
    server = new QTcpServer(this);
    connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
    if(!server->listen(QHostAddress::QHostAddress("192.168.0.1"), 5000)){
        qDebug() << "SERVER NOT STARTED";
    }
    else{
        qDebug() << "SERVER STARTED";
    }
}

void Socket::newConnection()
{
    QString clientMsg ;
    QTcpSocket *socket= server->nextPendingConnection();
    socket->write("Server Running on 192.168.0.1");
    socket->flush();
    socket->waitForBytesWritten();

    // Recieve the data from Client
    socket->waitForReadyRead();
    qDebug() << (clientMsg = socket->readAll());

    connect((socket, SIGNAL (readyRead)), Window::clientMsgWindow, SLOT(setClientWindow)); /*********** can I use signal and slot ************/
    //Window pWindow;         /********* tried using this but GUI crash ************/
    //pWindow->setClientWindow(clientMsg);
}

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can I use SIGNAL&SLOT mechanism to set the recieved message on the txt browser(ClientMsgWindow). How so ever this connect gives error as /socket.cpp:31: error: object missing in reference to 'Window::clientMsgWindow' which points to the declaration of clientMsgWindow in window.h
I am stuck in this.