I cannot connect with server

[8Observer8]

I cannot connect with server.

I create a server how this: http://www.youtube.com/watch?v=BSdKkZNEKlQ

I run the program. I see:

28.png
Server started!

I run "cmd.exe" and write:

telnet

then:

open 0.0.0.0 1234

I see:

29.png

MyFirstServer.pro

#-------------------------------------------------
#
# Project created by QtCreator 2013-08-14T15:00:25
#
#-------------------------------------------------
 
QT       += core
QT       += network
QT       -= gui
 
TARGET = MyFirstServer
CONFIG   += console
CONFIG   -= app_bundle
 
TEMPLATE = app
 
 
SOURCES += main.cpp \
    myserver.cpp
 
HEADERS += \
    myserver.h

#-------------------------------------------------
#
# Project created by QtCreator 2013-08-14T15:00:25
#
#-------------------------------------------------

QT       += core
QT       += network
QT       -= gui

TARGET = MyFirstServer
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp \
    myserver.cpp

HEADERS += \
    myserver.h

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main.cpp

#include <QCoreApplication>
#include "myserver.h"
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    MyServer mServer;
 
    return a.exec();
}

#include <QCoreApplication>
#include "myserver.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    MyServer mServer;
    
    return a.exec();
}

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myserver.h

#ifndef MYSERVER_H
#define MYSERVER_H
 
#include <QObject>
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>
 
class MyServer : public QObject
{
    Q_OBJECT
public:
    explicit MyServer(QObject *parent = 0);
 
signals:
 
public slots:
    void newConnection();
 
private:
    QTcpServer *server;
};
 
#endif // MYSERVER_H

#ifndef MYSERVER_H
#define MYSERVER_H

#include <QObject>
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>

class MyServer : public QObject
{
    Q_OBJECT
public:
    explicit MyServer(QObject *parent = 0);
    
signals:
    
public slots:
    void newConnection();

private:
    QTcpServer *server;
};

#endif // MYSERVER_H

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myserver.cpp

#include "myserver.h"
 
MyServer::MyServer(QObject *parent) :
    QObject(parent)
{
    server = new QTcpServer(this);
 
    connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
 
    if (!server->listen(QHostAddress::Any, 1234)) {
        qDebug() << "Server could not start!";
    }
    else {
        qDebug() << "Server started!";
        qDebug() << "Address: " << server->serverAddress();
        qDebug() << "Port: " <<  server->serverPort();
    }
}
 
void MyServer::newConnection() {
    QTcpSocket *socket = server->nextPendingConnection();
 
    socket->write("hello client\r\n");
    socket->flush();
 
    socket->waitForBytesWritten(3000);
 
    socket->close();
}

#include "myserver.h"

MyServer::MyServer(QObject *parent) :
    QObject(parent)
{
    server = new QTcpServer(this);

    connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));

    if (!server->listen(QHostAddress::Any, 1234)) {
        qDebug() << "Server could not start!";
    }
    else {
        qDebug() << "Server started!";
        qDebug() << "Address: " << server->serverAddress();
        qDebug() << "Port: " <<  server->serverPort();
    }
}

void MyServer::newConnection() {
    QTcpSocket *socket = server->nextPendingConnection();

    socket->write("hello client\r\n");
    socket->flush();

    socket->waitForBytesWritten(3000);

    socket->close();
}

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Thank you!

[wysota]

Do you understand what "0.0.0.0" means?

[hansenmartin]

Hi all,
If any one has any idea about the problem which is mentioned by 8Observer8. please help i have the same problem.

[8Observer8]

Do you understand what "0.0.0.0" means?

Yes, it's ip address.

[wysota]

Yes, it's ip address.

What kind of ip address? Do you understand what it points to? You will never be able to connect to 0.0.0.0.

[8Observer8]

> What kind of ip address? Do you understand what it points to?

I do not understand. It's new for me. How to know this ip address?

[anda_skoa]

You probably want to connect to 127.0.0.1, usually one of the addresses associated with the system's loopback device.

Since you listen to "any address" this one should be one of them.

0.0.0.0 is sometimes used to mean "any address" in the context of listening on a server socket or binding a receiving UDP socket. It is never used as an address for connecting to a server.

Cheers,
_

[8Observer8]

You probably want to connect to 127.0.0.1, usually one of the addresses associated with the system's loopback device.

Since you listen to "any address" this one should be one of them.

0.0.0.0 is sometimes used to mean "any address" in the context of listening on a server socket or binding a receiving UDP socket. It is never used as an address for connecting to a server.

Cheers,
_

Thank you very much!

Author used it in the video. How did I not notice...

30.png