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

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

阅读量：4842 次

发布时间：2019-06-11

本文共 3751 字，大约阅读时间需要 12 分钟。

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 
    
     #include 
     
      #include 
      
       class udpSend : public QPushButton   //继承自QPushButton 双击退出{    Q_OBJECT    public:    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 
    
     #include 
     
      #include 
      
       class udpClient : public QDialog{    Q_OBJECT    public:    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));}

转载于:https://www.cnblogs.com/xj626852095/p/3648129.html

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