QUpdSocket The program has unexpectedly finished.

[ariad]

Hello,
VirtualBox, openSUSE13.1, Qt Creator 2.8 Qt4.8
I want to receive data to other machine to my application but now I want to check and I have a application to write a message and another to read messages, but the application to write unexpectedly finished.

In the .h:

QUdpSocket *udpSocket;
QTimer *timer;


Application to read

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QUdpSocket>
#include <QByteArray>
#include <string.h>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    initSocket();
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::initSocket()
 {
     udpSocket = new QUdpSocket(this);
     udpSocket->bind(QHostAddress::LocalHost, 7755);
 
     connect(udpSocket, SIGNAL(readyRead()),this, SLOT(readPendingDatagrams()));
     emit SIGNAL(readyRead());
 }
 
 void MainWindow::readPendingDatagrams()
 {
     while (udpSocket->hasPendingDatagrams()) {
         QByteArray datagram;
         datagram.resize(udpSocket->pendingDatagramSize());
         QHostAddress sender;
         quint16 senderPort;
 
         udpSocket->readDatagram(datagram.data(), datagram.size(),&sender, &senderPort);
         processTheDatagram(datagram);
     }
 }
 
 
 void MainWindow::processTheDatagram(QByteArray datagram)
 {
     QDataStream in(&datagram, QIODevice::ReadOnly);
 
     for(int i=0;i<datagram.size();i++){
         //ui->label_2->setText(datagram.at(i).toString());      
         ui->label_2->setText("Recibido");
     }
 }

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QUdpSocket>
#include <QByteArray>
#include <string.h>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    initSocket();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::initSocket()
 {
     udpSocket = new QUdpSocket(this);
     udpSocket->bind(QHostAddress::LocalHost, 7755);

     connect(udpSocket, SIGNAL(readyRead()),this, SLOT(readPendingDatagrams()));
     emit SIGNAL(readyRead());
 }

 void MainWindow::readPendingDatagrams()
 {
     while (udpSocket->hasPendingDatagrams()) {
         QByteArray datagram;
         datagram.resize(udpSocket->pendingDatagramSize());
         QHostAddress sender;
         quint16 senderPort;

         udpSocket->readDatagram(datagram.data(), datagram.size(),&sender, &senderPort);
         processTheDatagram(datagram);
     }
 }


 void MainWindow::processTheDatagram(QByteArray datagram)
 {
     QDataStream in(&datagram, QIODevice::ReadOnly);

     for(int i=0;i<datagram.size();i++){
         //ui->label_2->setText(datagram.at(i).toString());      
         ui->label_2->setText("Recibido");
     }
 }

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Application to write

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    initSocket();
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::initSocket()
 {
     udpSocket = new QUdpSocket(this);
     udpSocket->bind(QHostAddress::LocalHost, 7755);
 
     connect(timer, SIGNAL(timeout()), this, SLOT(sendDatagram()));
     timer->start(2*1000);
 }
 
void MainWindow::sendDatagram()
{
    QByteArray datagram_send;
 
    datagram_send.append("Mensaje 1");
    udpSocket->writeDatagram(datagram_send.data(),datagram_send.size(),QHostAddress::LocalHost, 7755);
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    initSocket();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::initSocket()
 {
     udpSocket = new QUdpSocket(this);
     udpSocket->bind(QHostAddress::LocalHost, 7755);

     connect(timer, SIGNAL(timeout()), this, SLOT(sendDatagram()));
     timer->start(2*1000);
 }

void MainWindow::sendDatagram()
{
    QByteArray datagram_send;

    datagram_send.append("Mensaje 1");
    udpSocket->writeDatagram(datagram_send.data(),datagram_send.size(),QHostAddress::LocalHost, 7755);
}

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Maybe to check I don't need another application to check and only a method to write and call it when I initialize the QUpdSocket.
Any idea?? thanks