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Код


#ifndef WEATHERSTATION_H
#define WEATHERSTATION_H

#include <QDialog>
#include <QUdpSocket>

class QLabel;
class QLineEdit;

class WeatherStation : public QDialog
{
    Q_OBJECT

public:
    WeatherStation(QWidget *parent = 0);

private slots:
    void processPendingDatagrams();

private:
    QUdpSocket udpSocket;

    QLabel *dateLabel;
    QLabel *timeLabel;
    QLabel *temperatureLabel;
    QLabel *humidityLabel;
    QLabel *altitudeLabel;
    QLineEdit *dateLineEdit;
    QLineEdit *timeLineEdit;
    QLineEdit *temperatureLineEdit;
    QLineEdit *humidityLineEdit;
    QLineEdit *altitudeLineEdit;
};

#endif

Код


#include <QtGui>
#include <QtNetwork>

#include "weatherstation.h"

WeatherStation::WeatherStation(QWidget *parent)
    : QDialog(parent)
{
    udpSocket.bind(QHostAddress::Any,5824);

    connect(&udpSocket, SIGNAL(readyRead()),
            this, SLOT(processPendingDatagrams()));

    dateLabel = new QLabel(tr("Date:"));
    timeLabel = new QLabel(tr("Time:"));
    temperatureLabel = new QLabel(tr("Temperature:"));
    humidityLabel = new QLabel(tr("Humidity:"));
    altitudeLabel = new QLabel(tr("Altitude:"));

    dateLineEdit = new QLineEdit;
    timeLineEdit = new QLineEdit;
    temperatureLineEdit = new QLineEdit;
    humidityLineEdit = new QLineEdit;
    altitudeLineEdit = new QLineEdit;

    dateLineEdit->setReadOnly(true);
    timeLineEdit->setReadOnly(true);
    temperatureLineEdit->setReadOnly(true);
    humidityLineEdit->setReadOnly(true);
    altitudeLineEdit->setReadOnly(true);

    QGridLayout *mainLayout = new QGridLayout;
    mainLayout->addWidget(dateLabel, 0, 0);
    mainLayout->addWidget(dateLineEdit, 0, 1);
    mainLayout->addWidget(timeLabel, 1, 0);
    mainLayout->addWidget(timeLineEdit, 1, 1);
    mainLayout->addWidget(temperatureLabel, 2, 0);
    mainLayout->addWidget(temperatureLineEdit, 2, 1);
    mainLayout->addWidget(humidityLabel, 3, 0);
    mainLayout->addWidget(humidityLineEdit, 3, 1);
    mainLayout->addWidget(altitudeLabel, 4, 0);
    mainLayout->addWidget(altitudeLineEdit, 4, 1);
    setLayout(mainLayout);

    setWindowTitle(tr("Weather Station"));
}

void WeatherStation::processPendingDatagrams()
{
    QByteArray datagram;

    do {
        datagram.resize(udpSocket.pendingDatagramSize());
        udpSocket.readDatagram(datagram.data(), datagram.size());
    } while (udpSocket.hasPendingDatagrams());

    QDateTime dateTime;
    double temperature;
    double humidity;
    double altitude;

    QDataStream in(&datagram, QIODevice::ReadOnly);
    in.setVersion(QDataStream::Qt_4_3);
    in >> dateTime >> temperature >> humidity >> altitude;

    dateLineEdit->setText(dateTime.date().toString());
    timeLineEdit->setText(dateTime.time().toString());
    temperatureLineEdit->setText(tr("%1 C").arg(temperature));
    humidityLineEdit->setText(tr("%1%").arg(humidity));
    altitudeLineEdit->setText(tr("%1 m").arg(altitude));
}

Код


#include <QApplication>

#include "weatherballoon.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    WeatherBalloon balloon;
    balloon.show();
    return app.exec();
}

Код


#ifndef WEATHERBALLOON_H
#define WEATHERBALLOON_H

#include <QPushButton>
#include <QTimer>
#include <QUdpSocket>

class WeatherBalloon : public QPushButton
{
    Q_OBJECT

public:
    WeatherBalloon(QWidget *parent = 0);

    double temperature() const;
    double humidity() const;
    double altitude() const;

private slots:
    void sendDatagram();

private:
    QUdpSocket udpSocket;
    QTimer timer;
};

#endif

Код


#include <QtCore>
#include <QtNetwork>
#include <cstdlib>

#include "weatherballoon.h"

WeatherBalloon::WeatherBalloon(QWidget *parent)
    : QPushButton(tr("Quit"), parent)
{
    connect(this, SIGNAL(clicked()), this, SLOT(close()));
    connect(&timer, SIGNAL(timeout()), this, SLOT(sendDatagram()));

    timer.start(2 * 1000);

    setWindowTitle(tr("Weather Balloon"));
}

double WeatherBalloon::temperature() const
{
    return -20.0 + (2.0 * std::rand() / (RAND_MAX + 1.0));
}

double WeatherBalloon::humidity() const
{
    return 20.0 + (2.0 * std::rand() / (RAND_MAX + 1.0));
}

double WeatherBalloon::altitude() const
{
    return 7000 + (100.0 * std::rand() / (RAND_MAX + 1.0));
}

void WeatherBalloon::sendDatagram()
{
    QByteArray datagram;
    QDataStream out(&datagram, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_3);
    out << QDateTime::currentDateTime() << temperature() << humidity()
        << altitude();

    udpSocket.writeDatagram(datagram, QHostAddress::Broadcast, 5824);//code1
}