【QT】QT中UDP通信的实现（单播、组播和广播）

目录

效果展示

实现过程

数据发送端

数据接收端

---

效果展示

实现过程

Qt网络编程---UDP通信

工程中添加 QT += network

QUdpSocket

• 数据发送端

1. 创建QUdpSocket对象

QUdpSocket msocket

2. 调用对象方法发送数据（ip ， 端口号）

 头文件

#ifndef UDPSEND_H
#define UDPSEND_H

#include <QMainWindow>
#include <QUdpSocket>
namespace Ui {
class UdpSend;
}

class UdpSend : public QMainWindow
{
    Q_OBJECT

public:
    explicit UdpSend(QWidget *parent = nullptr);
    ~UdpSend();

private slots:
    void on_sendBt_clicked();

    void on_sendSigRb_clicked();

    void on_sendMulRb_clicked();

    void on_sendBroadRb_clicked();

    void on_textEdit_cursorPositionChanged();

    void on_clearBt_clicked();

private:
    Ui::UdpSend *ui;
    QUdpSocket *mSocket;
    QHostAddress sendaddrees;
    QString sendPort;
};

#endif // UDPSEND_H

 cpp文件

#include "udpsend.h"
#include "ui_udpsend.h"

#include <QMessageBox>

UdpSend::UdpSend(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::UdpSend)
{
    ui->setupUi(this);
    //初始化创建QUdpSocket对象
    mSocket = new QUdpSocket();
    ui->sendBt->setEnabled(false);
}

UdpSend::~UdpSend()
{
    delete ui;
}

void UdpSend::on_sendBt_clicked()
{
    //单播"192.168.12.206"
    //组播ip地址范围：224.0.0.0-239.255.255.255
    //广播QHostAddress::Broadcast
    mSocket->writeDatagram(ui->textEdit->toPlainText().toUtf8(),sendaddrees,sendPort.toInt());
}
//单播
void UdpSend::on_sendSigRb_clicked()
{
    if(ui->lineEdit_port->text().isEmpty() || ui->lineEdit_SigAddr->text().isEmpty())
    {
        QMessageBox::warning(this,"提示","请输入单播ip和端口号");
        return;
    }
    sendaddrees.setAddress( ui->lineEdit_SigAddr->text());
    sendPort  = ui->lineEdit_port->text();
}
//组播
void UdpSend::on_sendMulRb_clicked()
{
    if(ui->lineEdit_port->text().isEmpty() || ui->lineEdit_MulAddr->text().isEmpty())
    {
           QMessageBox::warning(this,"提示","请输入组播ip和端口号");
           return;
    }
    sendaddrees.setAddress( ui->lineEdit_port->text());
    sendPort  = ui->lineEdit_MulAddr->text();
}

void UdpSend::on_sendBroadRb_clicked()
{
    if(ui->lineEdit_port->text().isEmpty() || ui->lineEdit_BroadAddr->text().isEmpty())
    {
           QMessageBox::warning(this,"提示","请输入广播ip和端口号");
           return;
    }
    sendaddrees.setAddress( ui->lineEdit_BroadAddr->text());
    sendPort  = ui->lineEdit_MulAddr->text();
}


void UdpSend::on_textEdit_cursorPositionChanged()
{
    if(ui->textEdit->toPlainText().isEmpty())
    {
       ui->sendBt->setEnabled(false);
    }
    else
    {
       ui->sendBt->setEnabled(true);
    }
}

void UdpSend::on_clearBt_clicked()
{
    ui->textEdit->clear();
}

 

• 数据接收端

1.创建QUdpSocket对象

2.绑定端口地址

 

3.当有数据达到的时候会发送readyRead信号

4.在槽函数中调用对象方法读取数据

 

头文件 

#ifndef UDPRECV_H
#define UDPRECV_H

#include <QMainWindow>
#include <QUdpSocket>

namespace Ui {
class UdpRecv;
}

class UdpRecv : public QMainWindow
{
    Q_OBJECT

public:
    explicit UdpRecv(QWidget *parent = nullptr);
    ~UdpRecv();

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

    void on_recvCb_clicked(bool checked);

    void on_recvJoinMulBt_clicked();

    void on_clearBt_clicked();

    void on_exitBt_clicked();

private:
    Ui::UdpRecv *ui;
    QUdpSocket *mSocket;
};

#endif // UDPRECV_H

cpp文件

#include "udprecv.h"
#include "ui_udprecv.h"

#include <QMessageBox>

UdpRecv::UdpRecv(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::UdpRecv)
{
    ui->setupUi(this);
    mSocket = new QUdpSocket();
    //绑定
    mSocket->bind(QHostAddress::AnyIPv4,6677);
    //关联读数据信号readyread
    connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_data()));

}

UdpRecv::~UdpRecv()
{
    delete ui;
}
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


}

//选择接收
void UdpRecv::on_recvCb_clicked(bool checked)
{
    if(ui->lineEdit_port->text().isEmpty())
    {
        QMessageBox::warning(this,"提示","请输入端口号");
        ui->recvCb->setChecked(false);
              return;
     }
    if(checked)
    {
        mSocket->bind(QHostAddress::AnyIPv4,ui->lineEdit_port->text().toInt());
        connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_data()));
        ui->lineEdit_port->setEnabled(false);
    }
    else
    {
        mSocket->close();
        ui->lineEdit_port->setEnabled(true);
    }
}




void UdpRecv::on_recvJoinMulBt_clicked()
{
   if(ui->lineEdit_mulAddr->text().isEmpty())
   {
        QMessageBox::warning(this,"提示","请输入组播ip");
        return;
   }
   if(mSocket->joinMulticastGroup(QHostAddress(ui->lineEdit_mulAddr->text()))) //加入组播
   {
          ui->recvMulAddr->addItem(ui->lineEdit_mulAddr->text());
   }
   else
   {
        QMessageBox::warning(this,"提示","加入组播失败,请修改ip后继续加入");
        //return;
   }
}

void UdpRecv::on_clearBt_clicked()
{
    ui->listWidget->clear();
}

void UdpRecv::on_exitBt_clicked()
{
    mSocket->leaveMulticastGroup(QHostAddress(ui->recvMulAddr->currentIndex()));//退出组播地址列表当前的组播
    ui->recvMulAddr->removeItem(ui->recvMulAddr->currentIndex()); //删除组播地址列表中当前的组播
}