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Qt | UDP广播通信、简单使用案例
2022-07-06 13:48:00 【雍正不秃头】
Qt | UDP广播通信、简单使用案例
1、UDP广播介绍
UDP广播地址固定IP地址为:255.255.255.255,
接收方绑定0.0.0.0地址并监听指定端口即可收到广播的群发消息。
2、使用场景
某设备的业务通信是使用TCP协议,当该设备部署到一个新的网络环境当中时,设备的IP地址是未知的,需要知道或修改设备的IP地址才能够进行TCP的通信。
此时就可以在局域网内通过UDP广播的形式使该设备收到广播消息,从而使用设备返回IP地址、返回设备的MAC、修改IP地址等操作。
3、Qt UDP广播示例
服务器(发送广播消息端)示例代码:
我这里设定的端口为10123,不是固定的。但是服务器往哪个端口发送广播消息,客户端就得监听哪个端口。
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
socket = new QUdpSocket(this);
connect(socket, &QUdpSocket::readyRead, this, [=](){
while(socket->hasPendingDatagrams())
{
QByteArray data;
data.resize(socket->pendingDatagramSize());
QHostAddress host;
quint16 port;
socket->readDatagram(data.data(), data.size(), &host, &port); // 将客户端发来的数据在发送回去
}
});
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
socket->writeDatagram("this is broadcast message !", QHostAddress::Broadcast, 10123); // 发送广播消息
}
客户端(接收广播消息端)示例代码:
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
socket = new QUdpSocket(this);
if(!socket->bind(10123, QUdpSocket::ShareAddress))
{
ui->textBrowser->append("bind failed !");
}
connect(socket, &QUdpSocket::readyRead, this, [=](){
while(socket->hasPendingDatagrams())
{
QByteArray data;
data.resize(socket->pendingDatagramSize());
QHostAddress host;
quint16 port;
socket->readDatagram(data.data(), data.size(), &host, &port);
QString text = QString("[%1:%2]:%3").arg(host.toString()).arg(port).arg(QString(data));
ui->textBrowser->append(text);
}
});
}
MainWindow::~MainWindow()
{
delete ui;
}
4、运行效果
一个服务端用于发布广播消息,两个客户端(网络调试助手是客户端):
ends…
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