QTUDP通信Demo

#include "widgetclient.h" #include "ui_widgetclient.h" #include <QGridLayout> #include <QTimer> #include <QDateTime> WidgetClient::WidgetClient(QWidget *parent) : QWidget(parent), ui(new Ui::WidgetClient) { ui->setupUi(this); //此处的bind是个重载函数，连接本机的port端口，采用ShareAddress模式(即允许其它的服务连接到相同的地址和端口，特别是 //用在多客户端监听同一个服务器端口等时特别有效)，和ReuseAddressHint模式(重新连接服务器) mUdpSocket.bind(5824, QUdpSocket::ShareAddress | QUdpSocket::ReuseAddressHint); //readyRead()信号是每当有新的数据来临时就被触发 connect(&mUdpSocket,SIGNAL(readyRead()),SLOT(onProcessPendingDatagrams())); mDataLabel = new QLabel(tr("Data:")); mTimeLabel = new QLabel(tr("Time:")); mTemperatureLabel = new QLabel(tr("Temperature:")); mhumidtyLabel = new QLabel(tr("Hunidity:")); mAltitudeLabel = new QLabel(tr("Altitude:")); mDateLineEdit = new QLineEdit; mTimeLineEdit = new QLineEdit; mTemperatureLineEdit = new QLineEdit; mHunidityLineEdit = new QLineEdit; mAltitudeLineEdit = new QLineEdit; mDateLineEdit->setReadOnly(true); mTimeLineEdit->setReadOnly(true); mTemperatureLineEdit->setReadOnly(true); mHunidityLineEdit->setReadOnly(true); mAltitudeLineEdit->setReadOnly(true); QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(mDataLabel,0,0); mainLayout->addWidget(mDateLineEdit,0,1); mainLayout->addWidget(mTimeLabel,1,0); mainLayout->addWidget(mTimeLineEdit,1,1); mainLayout->addWidget(mTemperatureLabel,2,0); mainLayout->addWidget(mTemperatureLineEdit,2,1); mainLayout->addWidget(mhumidtyLabel,3,0); mainLayout->addWidget(mHunidityLineEdit,3,1); mainLayout->addWidget(mAltitudeLabel,4,0); mainLayout->addWidget(mAltitudeLineEdit,4,1); setLayout(mainLayout); setWindowTitle(tr("Weather Station")); } WidgetClient::~WidgetClient() { delete ui; } void WidgetClient::onProcessPendingDatagrams() { QByteArray datagram; while(mUdpSocket.hasPendingDatagrams()) //是否有数据包等待读取 { //pendingDatagramSize为返回第一个在等待读取报文的size，resize函数是把datagram的size归一化到参数size的大小一样 datagram.resize(mUdpSocket.pendingDatagramSize()); // //将读取到的不大于datagram.size()大小数据输入到datagram.data()中，datagram.data()返回的是一个字节数组中存储 //数据位置的指针 mUdpSocket.readDatagram(datagram.data(), datagram.size()); } QDateTime dateTime; double temperature; double humidity; double altitude; QDataStream in(&datagram,QIODevice::ReadOnly); //从datagram中读取数据 in.setVersion(QDataStream::Qt_5_6); //因为其属性为只读，所以是输入,值得注意的接收顺序与发送一致 in>>dateTime >> temperature >>humidity >>altitude; mDateLineEdit->setText(dateTime.date().toString()); mTimeLineEdit->setText(dateTime.time().toString()); mTemperatureLineEdit->setText(tr("%1 C").arg(temperature)); mHunidityLineEdit->setText(tr("%1%").arg(humidity)); mAltitudeLineEdit->setText(tr("%1 m").arg(altitude)); }