【Qt】Qt 网络编程——UDP单播通信
Qt 网络编程——UDP单播通信
- UDP单播通信概述
- UDP单播通信流程图
- 关键信号
- 关键函数
- UDP单播通信概述
- UDP单播通信流程图
- 关键信号
- 关键函数
- 主要代码
UDP单播通信概述
UDP单播通信流程图
关键信号
关键函数
UDP单播通信概述
- UDP没有所谓的服务器与客户端，只需双方绑定对方的Ip和端口号即可
- 绑定对方IP、端口是用于发送数据
- 绑定本地端口是便于对方发送数据
- 如果没有绑定本地端口，则会自动分配一个端口号，并不影响通信
UDP单播通信流程图
关键信号
| 信号 | 说明 |
|---|---|
| readyRead | 有可读数据时发出此信号 |
关键函数
| 函数名 | 说明 |
|---|---|
| writeDatagram | 发送数据报 |
| readDatagram | 读取数据报 |
| bind | 绑定本地IP、端口 |
主要代码
在.pro文件里添加QT += network，否则编译失败。
- .h文件
/******************************************************************************
* @文件名 udpSimulationClient.h
* @功能 简易的UDP通信功能Demo，第一种实现方式，传统UDP通信方式。
*
* @开发者
* @邮箱
* @时间 2022/06/24
* @备注
*****************************************************************************/
#pragma once
#include
#include "ui_udpSimulationClient.h"
#include
#include < QTimer>
class udpSimulationClient : public QMainWindow
{
Q_OBJECT
public:
udpSimulationClient(QWidget *parent = nullptr);
~udpSimulationClient();
private slots:
void on_pushButton_clicked();
void processData();
void data_send();
private:
Ui::udpSimulationClientClass ui;
QUdpSocket* m_sender;
QUdpSocket* m_receiver;
QTimer* timer;
};
- .cpp文件
#include "udpSimulationClient.h"
udpSimulationClient::udpSimulationClient(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
m_sender = new QUdpSocket(this);
m_receiver = new QUdpSocket(this);
m_receiver->bind(7777, QUdpSocket::ShareAddress);
//数据报到来时readyRead信号触发
connect(m_receiver, &QUdpSocket::readyRead, this, &udpSimulationClient::processData);
}
udpSimulationClient::~udpSimulationClient()
{
}
void udpSimulationClient::on_pushButton_clicked()
{
//QByteArray dataGram = ui.lineEdit->text().toUtf8();
QString Msg = ui.lineEdit->text() + QString(";") + ui.lineEdit_2->text() + QString(";")
+ ui.lineEdit_3->text() + QString(";") + ui.lineEdit_5->text() + QString(";")
+ ui.lineEdit_4->text() + QString(";") + ui.lineEdit_6->text() + QString(";");
//qint64 QUdpSocket::writeDatagram(const char *data, qint64 size, const QHostAddress &address, quint16 port)
m_sender->writeDatagram(Msg.toLatin1(), Msg.toUtf8().size(), QHostAddress::Broadcast, 6666);
}
void udpSimulationClient::processData()
{
QString strData;
while (m_receiver->hasPendingDatagrams())
{
QByteArray dataGram;
dataGram.resize(m_receiver->pendingDatagramSize());
m_receiver->readDatagram(dataGram.data(), dataGram.size());
//ui.lineEdit_12->setText(dataGram);
QString status_judge = dataGram;
if (status_judge.contains(QString("heart"), Qt::CaseSensitive))
{
//隔1s传输一次心跳状态数据
timer = new QTimer(this);
connect(timer, &QTimer::timeout, this, &udpSimulationClient::data_send);
timer->start(1000);
}
else if (status_judge.contains(QString("selfcheck"), Qt::CaseSensitive))
{
QString Msg = QString("selfcheck") + QString(";") + ui.lineEdit_10->text() + QString(";") + ui.lineEdit_11->text() + QString(";")
+ ui.lineEdit_9->text() + QString(";");
m_sender->writeDatagram(Msg.toLatin1(), Msg.toUtf8().size(), QHostAddress::Broadcast, 8888);
}
else if (status_judge.contains(QString("FPGA"), Qt::CaseSensitive))
{
QString Msg = QString("FPGA") + QString(";") + ui.lineEdit_7->text() + QString(";") + ui.lineEdit_8->text() + QString(";");
m_sender->writeDatagram(Msg.toLatin1(), Msg.toUtf8().size(), QHostAddress::Broadcast, 8888);
}
}
}
void udpSimulationClient::data_send()
{
QString Msg = QString("heart") + QString(";") + ui.lineEdit_14->text() + QString(";") + ui.lineEdit_12->text() + QString(";")
+ ui.lineEdit_13->text() + QString(";");
m_sender->writeDatagram(Msg.toLatin1(), Msg.toUtf8().size(), QHostAddress::Broadcast, 8888);
}
效果
下面展示一些 内联代码片。
/******************************************************************************
* @文件名 udpSimulationServer.h
* @功能 简易的UDP通信功能Demo，第一种实现方式，传统UDP通信方式。
*
* @开发者
* @邮箱
* @时间 2022/06/24
* @备注
*****************************************************************************/
#pragma once
#include
#include "ui_udpSimulationServer.h"
#include
class udpSimulationServer : public QMainWindow
{
Q_OBJECT
public:
udpSimulationServer(QWidget *parent = nullptr);
~udpSimulationServer();
private slots:
void processData();
void on_pushButton_clicked();
void processData2();
private:
Ui::udpSimulationServerClass ui;
QUdpSocket* m_receiver;
QUdpSocket* m_sender;
QUdpSocket* m_receiver2;
};
- .cpp文件
#include "udpSimulationServer.h"
udpSimulationServer::udpSimulationServer(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
m_receiver = new QUdpSocket(this);
m_sender = new QUdpSocket(this);
m_receiver2 = new QUdpSocket(this);
//绑定发送端，Shareaddress允许多接收端绑定6666端口
m_receiver->bind(6666, QUdpSocket::ShareAddress);
//接收端接收到数据时，就会发送readRead消息
connect(m_receiver, &QUdpSocket::readyRead, this, &udpSimulationServer :: processData);
m_receiver2->bind(8888, QUdpSocket::ShareAddress);
connect(m_receiver2, &QUdpSocket::readyRead, this, &udpSimulationServer::processData2);
}
udpSimulationServer::~udpSimulationServer()
{}
void udpSimulationServer::processData()
{
QString strData;
while (m_receiver->hasPendingDatagrams())
{
QByteArray dataGram;
dataGram.resize(m_receiver->pendingDatagramSize());
m_receiver->readDatagram(dataGram.data(), dataGram.size());
//ui.lineEdit_5->setText(dataGram);//将接收到的数据显示到标签上
QString Msg = dataGram;
QStringList Msglist = Msg.split(";");
ui.lineEdit_5->setText(Msglist[0]);
ui.lineEdit_6->setText(Msglist[1]);
ui.lineEdit_14->setText(Msglist[2]);
ui.lineEdit->setText(Msglist[3]);
ui.lineEdit_3->setText(Msglist[4]);
ui.lineEdit_15->setText(Msglist[5]);
}
}
void udpSimulationServer::processData2()
{
QByteArray dataGram;
dataGram.resize(m_receiver2->pendingDatagramSize());
m_receiver2->readDatagram(dataGram.data(), dataGram.size());
QString Msg = dataGram;
QStringList Msglist = Msg.split(";");
if (Msg.contains(QString("heart")))
{
ui.lineEdit_11->setText(Msglist[1]);
ui.lineEdit_12->setText(Msglist[2]);
ui.lineEdit_10->setText(Msglist[3]);
}
else if (Msg.contains(QString("selfcheck")))
{
ui.lineEdit_8->setText(Msglist[1]);
ui.lineEdit_7->setText(Msglist[2]);
ui.lineEdit_9->setText(Msglist[3]);
}
else if (Msg.contains(QString("FPGA")))
{
ui.lineEdit_4->setText(Msglist[1]);
ui.lineEdit_2->setText(Msglist[2]);
}
}
void udpSimulationServer::on_pushButton_clicked()
{
QString msg = "status:";
// QByteArray dataGram = msg.toLatin1() + ui.lineEdit_13->text().toUtf8();
QByteArray dataGram = msg.toLatin1() + ui.comboBox->currentText().toUtf8();
m_sender->writeDatagram(dataGram.data(), dataGram.size(), QHostAddress::Broadcast, 7777);
}
效果
- 接收指令：”status:heart”,则隔1s传输一次心跳状态数据；
- 接收指令：”status:selfcheck”,则返回设备自检结果；
- 接收指令：”status:FPGA”,则返回FPGA”模块结果；
- 点击发送按钮，则将射电模块数据发送给控制端