Qt-网络与通信-UDP网络通讯

用户数据报协议是一种简单的轻量级、不可靠、面向数据、无连接的传出层协议，可以应用于在可靠性不是十分重要的场合，如短消息，广播信息等。

例如一下场合

网络数据大多为短消息

拥有大量客户端

对数据安全性无特殊要求

网络负担飞常重，但对响应速度要求高

示例截图

服务器代码

.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_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"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      UdpServer::UdpServer(QWidget *parent)
     
    
   

    

     

    
    

     

          : QDialog(parent)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
    setWindowTitle(tr("UDP　Server"));
     
    
   

    

     

    
    

     

          TimerLabel = new QLabel(tr("计时器："),this);
     
    
   

    

     

    
    

     

          TextLineEdit = new QLineEdit(this);
     
    
   

    

     

    
    

     

          StartBtn = new QPushButton(tr("Start"),this);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          mainLayout = new QVBoxLayout(this);
     
    
   

    

     

    
    

     

          mainLayout->addWidget(TimerLabel);
     
    
   

    

     

    
    

     

          mainLayout->addWidget(TextLineEdit);
     
    
   

    

     

    
    

     

          mainLayout->addWidget(StartBtn);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    connect(StartBtn,SIGNAL(clicked(bool)),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("Stop");
     
    
   

    

     

    
    

     

              timer->start(1000);
     
    
   

    

     

    
    

     

              isStarted = true;
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     
    else
     
    
   

    

     

    
    

     

          {
     
    
   

    

     

    
    

     

              StartBtn->setText("Start");
     
    
   

    

     

    
    

     

              isStarted = false;
     
    
   

    

     

    
    

     

              timer->stop();
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void UdpServer::timeout()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          QString msg = TextLineEdit->text();
     
    
   

    

     

    
    

     
    int length = 0;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    if(msg =="")
     
    
   

    

     

    
    

     

          {
     
    
   

    

     

    
    

     
        return;
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     
    if((length = udpSocket->writeDatagram(msg.toLatin1(),msg.length(),QHostAddress::Broadcast,port)) != msg.length())
     
    
   

    

     

    
    

     

          {
     
    
   

    

     

    
    

     
        return;
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     

      }
     
    
  
 

客户端代码

.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 <QMessageBox>
     
    
   

    

     

    
    

     

      #include <QHostAddress>
     
    
   

    

     

    
    

     

      UdpClient::UdpClient(QWidget *parent)
     
    
   

    

     

    
    

     

          : QDialog(parent)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
    setWindowTitle("UODClient");
     
    
   

    

     

    
    

     

          ReceiveTextEdit = new QTextEdit(this);
     
    
   

    

     

    
    

     

          CloseBtn = new QPushButton("close",this);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          mainLayout = new QVBoxLayout(this);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          mainLayout->addWidget(ReceiveTextEdit);
     
    
   

    

     

    
    

     

          mainLayout->addWidget(CloseBtn);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    connect(CloseBtn,SIGNAL(clicked(bool)),this,SLOT(CloseBtnClicked()));
     
    
   

    

     

    
    

     

          port = 5555;
     
    
   

    

     

    
    

     

          udpSocket = new QUdpSocket(this);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    connect(udpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived()));
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    bool result = udpSocket->bind(port);
     
    
   

    

     

    
    

     
    if(!result)
     
    
   

    

     

    
    

     

          {
     
    
   

    

     

    
    

     

              QMessageBox::information(this,"Error","udp socket create error!");
     
    
   

    

     

    
    

     
        return;
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      UdpClient::~UdpClient()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void UdpClient::CloseBtnClicked()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
    close();
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void UdpClient::dataReceived()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
    while (udpSocket->hasPendingDatagrams())
     
    
   

    

     

    
    

     

          {
     
    
   

    

     

    
    

     

              QByteArray datagram;
     
    
   

    

     

    
    

     

              datagram.resize(udpSocket->pendingDatagramSize());
     
    
   

    

     

    
    

     

              udpSocket->readDatagram(datagram.data(),datagram.size());
     
    
   

    

     

    
    

     

              QString msg = datagram.data();
     
    
   

    

     

    
    

     

              ReceiveTextEdit->insertPlainText(msg);
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
  
 

工程连接：https://gitee.com/DreamLife-Technology_DreamLife/UDPProject

文章来源: dreamlife.blog.csdn.net，作者：DreamLife.，版权归原作者所有，如需转载，请联系作者。

原文链接：dreamlife.blog.csdn.net/article/details/79406029