QT 使用QUdpSocket QUdpServer UDP 建立客户端与服务器端

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1. 模拟天气监控，每隔两秒从Server发送天气信息到Client.

2. 示例代码

--------------------------- Server 端 -------------------------------------

修改工程文件.pro , QT += network， 添加net模块

udpsend.h

#ifndef UDPSEND_H
#define UDPSEND_H#include <QWidget>
#include <QtGui>
#include <QtNetwork>class udpSend : public QPushButton //继承自QPushButton 双击退出
{
Q_OBJECTpublic:
udpSend(QWidget *parent = 0);
~udpSend();private slots:
void sendDatagram();private:
QUdpSocket udpSocket;
QTimer timer;
};#endif // UDPSEND_H

udpsend.cpp

#include "udpsend.h"udpSend::udpSend(QWidget *parent)
: QPushButton(tr("clicked, quit"),parent)
{
connect(this, SIGNAL(clicked()), this, SLOT(close()));
connect(&timer, SIGNAL(timeout()), this, SLOT(sendDatagram())); //定时发送 timer.start(2000);
setSizeIncrement(100,100);
setWindowTitle(tr("Weather Balloon"));
}udpSend::~udpSend()
{
}void udpSend::sendDatagram()
{
QByteArray datagram;
QDataStream out(&datagram, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_7);
out << QDateTime::currentDateTime() << qrand()/10000000.0 << qrand()/10000000.0 << qrand()/10000000.0 ;
//发送主机可以用QHostAddress("127.0.0.1")替换
udpSocket.writeDatagram(datagram, QHostAddress::LocalHost, 13999); // UDP 发送数据
}

------------------------------- Client 端 ------------------------------------

udpclient.h

#ifndef UDPCLIENT_H
#define UDPCLIENT_H#include <QDialog>
#include <QtNetwork>
#include <QtGui>class udpClient : public QDialog
{
Q_OBJECTpublic:
udpClient(QWidget *parent = 0);
~udpClient();private slots:
void processPendingDatagrams();private:
QUdpSocket udpSocket; QLabel *dateLabel;
QLabel *timeLabel;
QLabel *tempLabel;
QLabel *humLabel;
QLabel *altiLabel;
QLineEdit *dateEdit;
QLineEdit *timeEdit;
QLineEdit *tempEdit;
QLineEdit *humEdit;
QLineEdit *altiEdit;
};#endif // UDPCLIENT_H

udpclient.cpp

#include "udpclient.h"udpClient::udpClient(QWidget *parent)
: QDialog(parent)
{
udpSocket.bind(13999); //建立监听
connect(&udpSocket, SIGNAL(readyRead()), this, SLOT(processPendingDatagrams())); //接收准备 dateLabel = new QLabel(tr("Date"));
timeLabel = new QLabel(tr("Time"));
tempLabel = new QLabel(tr("Temp"));
humLabel = new QLabel(tr("Hum"));
altiLabel = new QLabel(tr("Alti"));
dateEdit = new QLineEdit();
timeEdit = new QLineEdit();
tempEdit = new QLineEdit();
humEdit = new QLineEdit();
altiEdit = new QLineEdit(); QGridLayout *gLayout = new QGridLayout;
gLayout->addWidget(dateLabel, 0, 0);
gLayout->addWidget(dateEdit, 0, 1);
gLayout->addWidget(timeLabel, 1, 0);
gLayout->addWidget(timeEdit, 1, 1);
gLayout->addWidget(tempLabel, 2, 0);
gLayout->addWidget(tempEdit, 2, 1);
gLayout->addWidget(humLabel, 3, 0);
gLayout->addWidget(humEdit, 3, 1);
gLayout->addWidget(altiLabel, 4, 0);
gLayout->addWidget(altiEdit, 4, 1); setLayout(gLayout);}udpClient::~udpClient()
{
}void udpClient::processPendingDatagrams()
{
QByteArray datagram;
do{
datagram.resize(udpSocket.pendingDatagramSize());
udpSocket.readDatagram(datagram.data(), datagram.size()); //接收数据
}while( udpSocket.hasPendingDatagrams() ); QDateTime dateTime;
double temperature;
double humidity;
double altitude; QDataStream in(&datagram, QIODevice::ReadOnly);
in.setVersion(QDataStream::Qt_4_7);
in >> dateTime >> temperature >> humidity >> altitude; dateEdit->setText(dateTime.date().toString());
timeEdit->setText(dateTime.time().toString());
tempEdit->setText(tr("%1 C").arg(temperature));
humEdit->setText(tr("%1 %").arg(humidity));
altiEdit->setText(tr("%1 m").arg(altitude));}