网口通信编程--QUdpSocket发送端

矫情吗；* 2024-04-01 16:43 61阅读 0赞

网口通信编程–QUdpSocket发送端  
一、sender.h

#ifndef SENDER_H
    #define SENDER_H
    
    #include <QWidget>
    #include <QTimer>
    
    QT_BEGIN_NAMESPACE
    class QLabel;
    class QPushButton;
    class QUdpSocket;
    QT_END_NAMESPACE
    
    class Sender : public QWidget
    {
        
        Q_OBJECT
    
    public:
        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

二、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;
    }

三、main.cpp中调用 sender类

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