QUdpSocket使用整理

效果图

服务端源码
注意：在.pro中添加QT += network

udpserver.h

#ifndef UDPSERVER_H#define UDPSERVER_H#include <QDialog>#include <QLabel>#include <QLineEdit>#include <QPushButton>#include <QVBoxLayout>#include <QUdpSocket>#include <QTimer>class UdpServer : public QDialog{    Q_OBJECTpublic:    UdpServer(QWidget *parent = 0,Qt::WindowFlags f=0);    ~UdpServer();public slots:    void StartBtnClicked();//点击开始按钮    void timeout();//一段时间后执行函数private:    QLabel *TimerLabel;    QLineEdit *TextLineEdit;//发送内容的lineedit    QPushButton *StartBtn;//开始按钮    QVBoxLayout *mainLayout;//布局    int port;//端口号    bool isStarted;//是否开始    QUdpSocket *udpSocket;//udp    QTimer *timer;//计时器};#endif // UDPSERVER_H

udpserver.cpp

#include "udpserver.h"#include <QHostAddress>UdpServer::UdpServer(QWidget *parent, Qt::WindowFlags f)    : QDialog(parent,f){    setWindowTitle(tr("UDP Server"));    TimerLabel = new QLabel(tr("计时器："),this);    TextLineEdit = new QLineEdit(this);    StartBtn = new QPushButton(tr("开始"),this);    mainLayout = new QVBoxLayout(this);    mainLayout->addWidget(TimerLabel);    mainLayout->addWidget(TextLineEdit);    mainLayout->addWidget(StartBtn);    connect(StartBtn,SIGNAL(clicked()),this,SLOT(StartBtnClicked()));    port =5555;    isStarted=false;    udpSocket = new QUdpSocket(this);    timer = new QTimer(this);    connect(timer,SIGNAL(timeout()),this,SLOT(timeout()));}UdpServer::~UdpServer(){}void UdpServer::StartBtnClicked(){    if(!isStarted)    {        StartBtn->setText(tr("停止"));        timer->start(1000);//每1秒执行一次timeout()        isStarted =true;    }    else    {        StartBtn->setText(tr("开始"));        isStarted = false;        timer->stop();//停止    }}void UdpServer::timeout(){    QString msg = TextLineEdit->text();    int length=0;    if(msg=="")    {       return;    }    //通过udp写入传输数据    if((length=udpSocket->writeDatagram(msg.toLatin1(),msg.length(),QHostAddress::Broadcast,port))!=msg.length())    {        return;    }}

客户端源码
注意：在.pro中添加QT += network
udpclient.h

#ifndef UDPCLIENT_H#define UDPCLIENT_H#include <QDialog>#include <QVBoxLayout>#include <QTextEdit>#include <QPushButton>#include <QUdpSocket>class UdpClient : public QDialog{    Q_OBJECTpublic:    UdpClient(QWidget *parent = 0,Qt::WindowFlags f=0);    ~UdpClient();    public slots:    void CloseBtnClicked();//点击关闭按钮    void dataReceived();//点击接受按钮private:    QTextEdit *ReceiveTextEdit;//接受的内容    QPushButton *CloseBtn;//关闭    QVBoxLayout *mainLayout;//布局    int port;//端口号    QUdpSocket *udpSocket;//udp};#endif // UDPCLIENT_H

udpclient.cpp

#include "udpclient.h"#include <QMessageBox>#include <QHostAddress>UdpClient::UdpClient(QWidget *parent,Qt::WindowFlags f)    : QDialog(parent,f){    setWindowTitle(tr("UDP Client"));    ReceiveTextEdit = new QTextEdit(this);    CloseBtn = new QPushButton(tr("Close"),this);    mainLayout=new QVBoxLayout(this);    mainLayout->addWidget(ReceiveTextEdit);    mainLayout->addWidget(CloseBtn);    connect(CloseBtn,SIGNAL(clicked()),this,SLOT(CloseBtnClicked()));    port =5555;    udpSocket = new QUdpSocket(this);    connect(udpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived()));    bool result=udpSocket->bind(port);    //当绑定失败时弹出提示    if(!result)    {        QMessageBox::information(this,tr("error"),tr("udp socket create error!"));        return;    }}UdpClient::~UdpClient(){}void UdpClient::CloseBtnClicked(){    close();}void UdpClient::dataReceived(){    //通过udp接收数据    while(udpSocket->hasPendingDatagrams())    {        QByteArray datagram;        datagram.resize(udpSocket->pendingDatagramSize());        //读取数据        udpSocket->readDatagram(datagram.data(),datagram.size());        QString msg=datagram.data();        //向textdit中插入数据        ReceiveTextEdit->insertPlainText(msg);    }}