QT之UDP通信 - 码农教程

参考链接：

https://www.cnblogs.com/wurenzhong/p/8030220.html

这里用的无线网：ipconfig查看下ip

udpsend：

udpSend.cpp：

#include "udpSend.h"
//#include <QUdpSocket>
#include <QMessageBox>

udpSend::udpSend(QWidget *parent)
  : QMainWindow(parent)
{
  ui.setupUi(this);

  mSocket = new QUdpSocket();

  
}
void udpSend::on_sendBt_clicked()
 {
       //单播
      qint64 len = mSocket->writeDatagram(ui.textEdit->toPlainText().toUtf8(),QHostAddress("192.168.0.194"),8007);
    
    
         //组播ip地址范围：224.0.0.0-239.255.255.255
         //qint64 len = mSocket->writeDatagram(ui.textEdit->toPlainText().toUtf8(),QHostAddress("224.0.0.100"),6677);
    
         //广播
       //  qint64 len = mSocket->writeDatagram(ui.textEdit->toPlainText().toUtf8(), QHostAddress::Broadcast, 8007);
  //QMessageBox::information(this, "Warning", ui.textEdit->toPlainText().toUtf8());
      
 }

udpSend.h

#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_udpSend.h"
#include <QUdpSocket>


class udpSend : public QMainWindow
{
  Q_OBJECT

public:
  udpSend(QWidget *parent = Q_NULLPTR);

private:
  Ui::udpSendClass ui;
  QUdpSocket *mSocket;

private slots:
  void on_sendBt_clicked();
};

udpRecv：

udpRecv.cpp

#include "udpRecv.h"
#include <QMessageBox>
#if _MSC_VER >= 1600
#pragma execution_character_set("utf-8")
#endif

udpRecv::udpRecv(QWidget *parent)
  : QMainWindow(parent)
{
  ui.setupUi(this);
   //创建对象 初始化
    mSocket = new QUdpSocket();

    //绑定
    mSocket->bind(QHostAddress::AnyIPv4,8007);
  //QMessageBox::information(this, "Warning", QString(QHostAddress::AnyIPv4));//不会乱码
    //关联读数据信号readyread
    connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_data()));
  
}

 void udpRecv::read_data()
 {
     QByteArray array;
     QHostAddress address;
     quint16 port;
     array.resize(mSocket->bytesAvailable());//根据可读数据来设置空间大小
     mSocket->readDatagram(array.data(),array.size(),&address,&port); //读取数据
     ui.listWidget->addItem(array);//显示数据
    //发送反馈数据
 
 }
 
 void udpRecv::on_checkBox_clicked(bool checked)
 {
     if(checked)
     {
         //加入组播
         mSocket->joinMulticastGroup(QHostAddress("224.0.0.100"));
     }
 
     else
     {
         //退出组播
         mSocket->leaveMulticastGroup(QHostAddress("224.0.0.100"));
 
     }
 
 }

udpRecv.h：

#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_udpRecv.h"
#include <QUdpSocket>

class udpRecv : public QMainWindow
{
  Q_OBJECT

public:
  udpRecv(QWidget *parent = Q_NULLPTR);

private:
  Ui::udpRecvClass ui;
  QUdpSocket *mSocket;

 private slots:
    void on_checkBox_clicked(bool);
    void read_data();
};

测试结果：