QT UDP-based client and server (use of QUdpSocket class)

program

Need to add the network module QT + = network in .pro.
This program sets a timer on the server to periodically send information to the client.

server

.h
#ifndef UDPSERVER_H
#define UDPSERVER_H

#include <QWidget>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QVBoxLayout>
#include <QUdpSocket>
#include <QTimer>

class UdpServer : public QWidget
{
    Q_OBJECT

public:
    UdpServer(QWidget *parent = 0);
    ~UdpServer();
public slots:
    void StartBtnClicked();
    void timeout();
private:
    QLabel *TimerLabel;
    QLineEdit *TextLineEdit;
    QPushButton *StartBtn;
    QVBoxLayout *mainLayout;
    int port;
    bool isStarted;
    QUdpSocket *udpSocket;
    QTimer *timer;
};

#endif // UDPSERVER_H

.cpp
#include "udpserver.h"
#include <QHostAddress>
#include <QUdpSocket>
#include <QDebug>

UdpServer::UdpServer(QWidget *parent)
    : QWidget(parent)
{
    setWindowTitle(tr("UDP Server"));
    /* 初始化各个控件 */
    TimerLabel = new QLabel(tr("计时器："),this);
    TextLineEdit = new QLineEdit(this);
    StartBtn = new QPushButton(tr("开始"),this);
    /* 设置布局 */
    mainLayout = new QVBoxLayout(this);
    mainLayout->addWidget(TimerLabel);
    mainLayout->addWidget(TextLineEdit);
    mainLayout->addWidget(StartBtn);
    connect(StartBtn,SIGNAL(clicked()),this,SLOT(StartBtnClicked()));
    port = 5555;		//设置UDP的端口号参数
    isStarted = false;
    udpSocket=new QUdpSocket;//创建一个QUdpSocket
    timer = new QTimer(this);
    //定时发送广播信息
    connect(timer,SIGNAL(timeout()),this,SLOT(timeout()));
}

UdpServer::~UdpServer()
{

}

void UdpServer::StartBtnClicked()
{
    if(!isStarted)
    {
        StartBtn->setText("停止");
        timer->start(1000);
        isStarted=true;
    }
    else
    {
        StartBtn->setText("开始");
        isStarted=false;
        timer->stop();
    }
}

void UdpServer::timeout()
{
    QString msg =TextLineEdit->text();
    qDebug()<<msg.toLatin1();
    int length=0;
    if(msg=="")
    {
        return;
    }
    if((length=udpSocket->writeDatagram(msg.toLatin1(),msg.length(),QHostAddress::Broadcast,port))!=msg.length())//QHostAddress::Broadcast向广播地址发送
    {
        return;
    }
}

Client

.h
#ifndef UDPCLIENT_H
#define UDPCLIENT_H

#include <QDialog>
#include <QVBoxLayout>
#include <QTextEdit>
#include <QPushButton>
#include <QUdpSocket>

class UdpClient : public QDialog
{
    Q_OBJECT

public:
    UdpClient(QWidget *parent = 0);
    ~UdpClient();
public slots:
    void CloseBtnClicked();
    void dataReceived();
private:
    QTextEdit *ReceiveTextEdit;
    QPushButton *CloseBtn;
    QVBoxLayout *mainLayout;
    int port;
    QUdpSocket *udpSocket;
};

#endif // UDPCLIENT_H

.cpp
#include "udpclient.h"
#include <QUdpSocket>
#include <QMessageBox>
#include <QHostAddress>

UdpClient::UdpClient(QWidget *parent)
    : QDialog(parent)
{
    setWindowTitle(tr("UDP Client"));		//设置窗体的标题
    /* 初始化各个控件 */
    ReceiveTextEdit = new QTextEdit(this);
    CloseBtn = new QPushButton(tr("Close"),this);
    /* 设置布局 */
    mainLayout=new QVBoxLayout(this);
    mainLayout->addWidget(ReceiveTextEdit);
    mainLayout->addWidget(CloseBtn);
    connect(CloseBtn,SIGNAL(clicked()),this,SLOT(CloseBtnClicked()));
    port =5555;                             //设置UDP的端口号参数，指定在此端口上监听数据
    udpSocket = new QUdpSocket(this);		//创建一个QUdpSocket
    connect(udpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived()));
    bool result=udpSocket->bind(port);//绑定端口
    if(!result)
    {
        QMessageBox::information(this,"error","udp socket create error!");
        return;
    }
}

UdpClient::~UdpClient()
{

}

void UdpClient::CloseBtnClicked()
{
    close();
}

void UdpClient::dataReceived()
{
    while(udpSocket->hasPendingDatagrams())//有数据报可读
    {
        QByteArray datagram;
        datagram.resize(udpSocket->pendingDatagramSize());
        udpSocket->readDatagram(datagram.data(),datagram.size());
        QString msg=datagram.data();
        ReceiveTextEdit->insertPlainText(msg);
    }
}

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