此例子展示了使用Qt Network API發送廣播包

程序結構如下：

代碼如下：

sender.h

#ifndef SENDER_H #define SENDER_H#include <QWidget> #include <QTimer>QT_BEGIN_NAMESPACE class QLabel; class QPushButton; class QUdpSocket; QT_END_NAMESPACEclass Sender : public QWidget {Q_OBJECTpublic:explicit Sender(QWidget *parent = nullptr);private slots:void startBroadcasting();void broadcastDatagram();private:QLabel *statusLabel = nullptr;QPushButton *startButton = nullptr;QUdpSocket *udpSocket = nullptr;QTimer timer;int messageNo = 1; };#endif

?main.cpp

#include <QApplication>#include "sender.h"int main(int argc, char *argv[]) {QApplication app(argc, argv);Sender sender;sender.show();return app.exec(); }

?sender.cpp

#include <QtWidgets> #include <QtNetwork> #include <QtCore>#include "sender.h"Sender::Sender(QWidget *parent): QWidget(parent) {statusLabel = new QLabel(tr("Ready to broadcast datagrams on port 45454"));statusLabel->setWordWrap(true);startButton = new QPushButton(tr("&Start"));auto quitButton = new QPushButton(tr("&Quit"));auto buttonBox = new QDialogButtonBox;buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);//! [0]udpSocket = new QUdpSocket(this); //! [0]connect(startButton, &QPushButton::clicked, this, &Sender::startBroadcasting);connect(quitButton, &QPushButton::clicked, this, &Sender::close);connect(&timer, &QTimer::timeout, this, &Sender::broadcastDatagram);auto mainLayout = new QVBoxLayout;mainLayout->addWidget(statusLabel);mainLayout->addWidget(buttonBox);setLayout(mainLayout);setWindowTitle(tr("Broadcast Sender")); }void Sender::startBroadcasting() {startButton->setEnabled(false);timer.start(1000); }void Sender::broadcastDatagram() {statusLabel->setText(tr("Now broadcasting datagram %1").arg(messageNo)); //! [1]QByteArray datagram = "Broadcast message " + QByteArray::number(messageNo);udpSocket->writeDatagram(datagram, QHostAddress::Broadcast, 45454); //! [1]++messageNo; }

來分析下：

這里有個信號和槽，Qtimer關聯了broadcastDatagram槽函數。發送廣播包的就是這個槽函數。

來看下這個：

?這里就調用了udpSocket的writeDatagram，第二個參數就是廣播報的，通過這種方式發送廣播報。

?

總結

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