Qt利用QUdpSocket实现UDP点对点通信处理

 相关资料：

https://download.csdn.net/download/zhujianqiangqq/47467208      代码包下载

udpsend.cpp主函数

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QByteArray>
#include <QCoreApplication>
#include <QUdpSocket>
#include <QTimer>

const quint16 PORT = 2333;

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_pTimer = new QTimer(this);
    m_pTimer->setSingleShot(false);
    m_pTimer->start(1000);
    connect(m_pTimer, &QTimer::timeout, this, &MainWindow::on_Timer);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    // 初始化UDP对象
    QUdpSocket oUDPSend;
    // 发送信息
    QDateTime sysDateTime;
    QByteArray msg = (sysDateTime.currentDateTime().toString("yyyy-MM-dd hh:mm:ss")+" \n").toLatin1();
    oUDPSend.writeDatagram(msg, QHostAddress("10.0.1.45"), PORT);// 需要先帮定127.0.0.1或10.0.1.45，都是本机IP
    // 输出信息（提示用，没有实际作用）
    ui->textEdit->insertPlainText(QStringLiteral("1"));
}

void MainWindow::on_Timer()
{
    on_pushButton_clicked();
}

udpReceiver.cpp主函数

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_pUDPReceiver = new QUdpSocket;
    m_pUDPReceiver->bind(QHostAddress("10.0.1.45"), PORT);// 第一步：需要先帮定127.0.0.1或10.0.1.45，都是本机IP
    connect(m_pUDPReceiver, SIGNAL(readyRead()), this, SLOT(receive()));//第二步：帮定读取事件
}

MainWindow::~MainWindow()
{
    delete ui;
    delete m_pUDPReceiver;
}

void MainWindow::receive()
{
    QByteArray ba;
    QString ss;
    while(m_pUDPReceiver->hasPendingDatagrams())
    {
        ba.resize(m_pUDPReceiver->pendingDatagramSize());
        m_pUDPReceiver->readDatagram(ba.data(), ba.size());
        ss = QString::fromUtf8(ba.data());
        ui->textEdit->insertPlainText(ss);
    }
}