QtNetwork (examples) - update broadcastsender

Fix copyrights, update signal-slot connection syntax, use some simple
C++11 features (member-initializers, 'auto'), delete some data-members
(where a local variable is enough), where possible - use data-memebrs
as sub-objects (instead of heap allocated).

Task-number: QTBUG-60628
Change-Id: Ia440d8471eafb47481c0d010175c907037bae841
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

examples/network/broadcastsender/sender.cpp

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -50,6 +50,7 @@
 
 #include <QtWidgets>
 #include <QtNetwork>
+#include <QtCore>
 
 #include "sender.h"
 
@@ -60,23 +61,21 @@ Sender::Sender(QWidget *parent)
     statusLabel->setWordWrap(true);
 
     startButton = new QPushButton(tr("&Start"));
-    quitButton = new QPushButton(tr("&Quit"));
+    auto quitButton = new QPushButton(tr("&Quit"));
 
-    buttonBox = new QDialogButtonBox;
+    auto buttonBox = new QDialogButtonBox;
     buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);
     buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
 
-    timer = new QTimer(this);
 //! [0]
     udpSocket = new QUdpSocket(this);
 //! [0]
-    messageNo = 1;
 
-    connect(startButton, SIGNAL(clicked()), this, SLOT(startBroadcasting()));
+    connect(startButton, &QPushButton::clicked, this, &Sender::startBroadcasting);
-    connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
+    connect(quitButton, &QPushButton::clicked, this, &Sender::close);
-    connect(timer, SIGNAL(timeout()), this, SLOT(broadcastDatagram()));
+    connect(&timer, &QTimer::timeout, this, &Sender::broadcastDatagram);
 
-    QVBoxLayout *mainLayout = new QVBoxLayout;
+    auto mainLayout = new QVBoxLayout;
     mainLayout->addWidget(statusLabel);
     mainLayout->addWidget(buttonBox);
     setLayout(mainLayout);
@@ -87,7 +86,7 @@ Sender::Sender(QWidget *parent)
 void Sender::startBroadcasting()
 {
     startButton->setEnabled(false);
-    timer->start(1000);
+    timer.start(1000);
 }
 
 void Sender::broadcastDatagram()
@@ -95,8 +94,7 @@ void Sender::broadcastDatagram()
     statusLabel->setText(tr("Now broadcasting datagram %1").arg(messageNo));
 //! [1]
     QByteArray datagram = "Broadcast message " + QByteArray::number(messageNo);
-    udpSocket->writeDatagram(datagram.data(), datagram.size(),
+    udpSocket->writeDatagram(datagram, QHostAddress::Broadcast, 45454);
-                             QHostAddress::Broadcast, 45454);
 //! [1]
     ++messageNo;
 }

examples/network/broadcastsender/sender.h

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -52,12 +52,11 @@
 #define SENDER_H
 
 #include <QWidget>
+#include <QTimer>
 
 QT_BEGIN_NAMESPACE
-class QDialogButtonBox;
 class QLabel;
 class QPushButton;
-class QTimer;
 class QUdpSocket;
 QT_END_NAMESPACE
 
@@ -66,20 +65,18 @@ class Sender : public QWidget
     Q_OBJECT
 
 public:
-    Sender(QWidget *parent = 0);
+    explicit Sender(QWidget *parent = nullptr);
 
 private slots:
     void startBroadcasting();
     void broadcastDatagram();
 
 private:
-    QLabel *statusLabel;
+    QLabel *statusLabel = nullptr;
-    QPushButton *startButton;
+    QPushButton *startButton = nullptr;
-    QPushButton *quitButton;
+    QUdpSocket *udpSocket = nullptr;
-    QDialogButtonBox *buttonBox;
+    QTimer timer;
-    QUdpSocket *udpSocket;
+    int messageNo = 1;
-    QTimer *timer;
-    int messageNo;
 };
 
 #endif