UDP广播

//UDPserver文件

//receiver.h

#ifndef RECEIVER_H

#define RECEIVER_H

#include <QDialog>

class QUdpSocket;

namespace Ui {

class Receiver;

}

class Receiver : public QDialog

{

    Q_OBJECT

public:

    explicit Receiver(QWidget *parent = 0);

    ~Receiver();

private:

    Ui::Receiver *ui;

    QUdpSocket *receiver;

private slots:

    void processPendingDatagram();

};

#endif // RECEIVER_H

//receiver.cpp

#include "receiver.h"

#include "ui_receiver.h"

#include <QtNetwork>

Receiver::Receiver(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Receiver)

{

    ui->setupUi(this);

    receiver=new QUdpSocket(this);

    receiver->bind(4396,QUdpSocket::ShareAddress);

    connect(receiver,&QUdpSocket::readyRead,this,

            &Receiver::processPendingDatagram);

}

Receiver::~Receiver()

{

    delete ui;

}

void Receiver::processPendingDatagram()

{

    while(receiver->hasPendingDatagrams())

    {

        QByteArray datagram;

        datagram.resize(receiver->pendingDatagramSize());

        receiver->readDatagram(datagram.data(),datagram.size());

        ui->label->setText(datagram);

    }

}

//main.cpp

#include "receiver.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Receiver w;

    w.show();

    return a.exec();

}

//UPDsender文件

//sender.h

#ifndef SENDER_H

#define SENDER_H

#include <QDialog>

class QUdpSocket;

namespace Ui {

class Sender;

}

class Sender : public QDialog

{

    Q_OBJECT

public:

    explicit Sender(QWidget *parent = 0);

    ~Sender();

private slots:

    void on_pushButton_clicked();

private:

    Ui::Sender *ui;

    QUdpSocket *sender;

};

#endif // SENDER_H

//sender.cpp

#include "Sender.h"

#include "ui_Sender.h"

#include <QtNetwork>

Sender::Sender(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Sender)

{

    ui->setupUi(this);

}

Sender::~Sender()

{

    delete ui;

    sender=new QUdpSocket(this);

}

void Sender::on_pushButton_clicked()

{

    QByteArray datagram="hello world!";

    sender->writeDatagram(datagram.data(),datagram.size(),

                          QHostAddress::Broadcast,4396);

}

//main.cpp

#include "Sender.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Sender w;

    w.show();

    return a.exec();

}