我无法通过带有 QUdpSocket 的 UDP 使用 QHostAddress::LocalHost 看到 IP 地址

Question

i'm planning do a little app desktop with Qt Creator. I'm using QUdpSocket class to make a simple connection through UDP, in fact i used a test code i found on internet, but my problem is when i run the code and the console just show me the port and the message, not the ip address where come from the message. Could someone tell me what i'm doing bad?

The source reference is this

This is the header file:

#ifndef PRUEBAUDP_H
#define PRUEBAUDP_H

#include <QObject>
#include <QUdpSocket>
#include <QDebug>

/*#include <QNetworkDatagram>
#include <QHostAddress>*/


class pruebaUDP : public QObject
{
  Q_OBJECT
public:
  explicit pruebaUDP(QObject *parent = nullptr);
  void mensajeSocket();

signals:

public slots:
void readyRead();

private:
  QUdpSocket *udpSocket;
};

#endif // PRUEBAUDP_H

This is the source file:

    #include "pruebaudp.h"

pruebaUDP::pruebaUDP(QObject *parent) : QObject(parent)
{
  udpSocket = new QUdpSocket(this);
  udpSocket->bind(QHostAddress::LocalHost, 1234);

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

void pruebaUDP::mensajeSocket()
{
  QByteArray dato;
  dato.append("hola");
  udpSocket->writeDatagram(dato, QHostAddress::LocalHost, 1234);
}

void pruebaUDP::readyRead()
{
  QByteArray buffer;
  buffer.resize(udpSocket->pendingDatagramSize());

  QHostAddress sender;
  quint16 senderPort;
  udpSocket->readDatagram(buffer.data(), buffer.size(), &sender, &senderPort);

  qDebug() << "Desde: " << sender.toString();
  qDebug() << "mensaje del puerto: " << senderPort;
  qDebug() << "mensaje: " << buffer;
}

and this is the main file:

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

int main(int argc, char *argv[])
{
  QCoreApplication a(argc, argv);
  pruebaUDP prueba;
 prueba.mensajeSocket();

  return a.exec();
}

This is a input screenshot:

Answer 1

You use same socket for sending and receiving. Try to send data via other socket, ie

void pruebaUDP::mensajeSocket()
{
  QByteArray dato;
  dato.append("hola");
  static QUdpSocket * socket = new QUdpSocket(this);
  socket->writeDatagram(dato, QHostAddress::LocalHost, 1234);
}