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50
51#include <QLabel>
52#include <QPushButton>
53#include <QUdpSocket>
54#include <QVBoxLayout>
55
56#include "receiver.h"
57
58Receiver::Receiver(QWidget *parent)
59 : QWidget(parent)
60{
61 statusLabel = new QLabel(tr(s: "Listening for broadcasted messages"));
62 statusLabel->setWordWrap(true);
63
64 auto quitButton = new QPushButton(tr(s: "&Quit"));
65
66//! [0]
67 udpSocket = new QUdpSocket(this);
68 udpSocket->bind(port: 45454, mode: QUdpSocket::ShareAddress);
69//! [0]
70
71//! [1]
72 connect(sender: udpSocket, signal: &QUdpSocket::readyRead,
73 receiver: this, slot: &Receiver::processPendingDatagrams);
74//! [1]
75 connect(sender: quitButton, signal: &QPushButton::clicked,
76 receiver: this, slot: &Receiver::close);
77
78 auto buttonLayout = new QHBoxLayout;
79 buttonLayout->addStretch(stretch: 1);
80 buttonLayout->addWidget(quitButton);
81 buttonLayout->addStretch(stretch: 1);
82
83 auto mainLayout = new QVBoxLayout;
84 mainLayout->addWidget(statusLabel);
85 mainLayout->addLayout(layout: buttonLayout);
86 setLayout(mainLayout);
87
88 setWindowTitle(tr(s: "Broadcast Receiver"));
89}
90
91void Receiver::processPendingDatagrams()
92{
93 QByteArray datagram;
94//! [2]
95 while (udpSocket->hasPendingDatagrams()) {
96 datagram.resize(size: int(udpSocket->pendingDatagramSize()));
97 udpSocket->readDatagram(data: datagram.data(), maxlen: datagram.size());
98 statusLabel->setText(tr(s: "Received datagram: \"%1\"")
99 .arg(a: datagram.constData()));
100 }
101//! [2]
102}
103

source code of qtbase/examples/network/broadcastreceiver/receiver.cpp