网口通信编程--QUdpSocket接收端

野性酷女 2024-04-01 16:44 53阅读 0赞

网口通信编程–QUdpSocket接收端  
一、receiver.h

#ifndef RECEIVER_H
    #define RECEIVER_H
    
    #include <QWidget>
    
    QT_BEGIN_NAMESPACE
    class QLabel;
    class QUdpSocket;
    QT_END_NAMESPACE
    
    class Receiver : public QWidget
    {
        
        Q_OBJECT
    
    public:
        explicit Receiver(QWidget *parent = nullptr);
    
    private slots:
        void processPendingDatagrams();
    
    private:
        QLabel *statusLabel = nullptr;
        QUdpSocket *udpSocket = nullptr;
    };
    
    #endif

二、receiver.cpp

#include <QtWidgets>
    #include <QtNetwork>
    
    #include "receiver.h"
    
    Receiver::Receiver(QWidget *parent)
        : QWidget(parent)
    {
        
        statusLabel = new QLabel(tr("Listening for broadcasted messages"));
        statusLabel->setWordWrap(true);
    
        auto quitButton = new QPushButton(tr("&Quit"));
    
    //! [0]
        udpSocket = new QUdpSocket(this);
        udpSocket->bind(45454, QUdpSocket::ShareAddress);
    //! [0]
    
    //! [1]
        connect(udpSocket, SIGNAL(readyRead()),
                this, SLOT(processPendingDatagrams()));
    //! [1]
        connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
    
        auto buttonLayout = new QHBoxLayout;
        buttonLayout->addStretch(1);
        buttonLayout->addWidget(quitButton);
        buttonLayout->addStretch(1);
    
        auto mainLayout = new QVBoxLayout;
        mainLayout->addWidget(statusLabel);
        mainLayout->addLayout(buttonLayout);
        setLayout(mainLayout);
    
        setWindowTitle(tr("Broadcast Receiver"));
    }
    
    void Receiver::processPendingDatagrams()
    {
        
        QByteArray datagram;
    //! [2]
        while (udpSocket->hasPendingDatagrams()) {
        
            datagram.resize(int(udpSocket->pendingDatagramSize()));
            udpSocket->readDatagram(datagram.data(), datagram.size());
            statusLabel->setText(tr("Received datagram: \"%1\"")
                                 .arg(datagram.constData()));
        }
    //! [2]
    }

三、main.cpp中调用

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