code part:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QLabel>
#include <QUdpSocket>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void onSocketStateChange(QAbstractSocket::SocketState socketState);
void onSocketReadyRead();//Read the incoming data from the socket
void on_bindBtn_clicked();
void on_stopBtn_clicked();
void on_btnSend_clicked();
void on_clearBtn_clicked();
void on_quitBtn_clicked();
private:
QLabel* LabSocketState;//socket status display label
QUdpSocket* udpSocket;
QString getLocalIp();//Get local IP address
QHostAddress groupAddress;//multicast address
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QHostInfo>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{ ui->setupUi(this) ; LabSocketState = new QLabel("Socket State"); LabSocketState->setMinimumWidth(200); ui->statusBar->addWidget(LabSocketState); QString localIP = getLocalIp();//Get IP address this->setWindowTitle(this- >windowTitle()+"---local IP"+localIP); udpSocket = new QUdpSocket; udpSocket->setSocketOption(QAbstractSocket::MulticastTtlOption,1);//Set parameters for socket
connect(udpSocket,SIGNAL(stateChanged(QAbstractSocket::SocketState)),this,SLOT(onSocketStateChange(QAbstractSocket::SocketState)));
onSocketStateChange(udpSocket->state());
connect(udpSocket,SIGNAL(readyRead()),this,SLOT(onSocketReadyRead()));
}
void MainWindow::on_bindBtn_clicked()
{//join multicast
QString IP = ui->comboTargetIp->currentText();
groupAddress = QHostAddress(IP);
quint16 groupPort = ui->spinBox->value();//port
if(udpSocket->bind(QHostAddress::AnyIPv4,groupPort,QUdpSocket::ShareAddress))
{ udpSocket->joinMulticastGroup(groupAddress);//Join multicast group ui->plainTextEdit->appendPlainText("**Join multicast successfully "); ui->plainTextEdit->appendPlainText("Multicast address IP: "+IP); ui->plainTextEdit->appendPlainText("**Binding port: "+QString::number(groupPort)); ui- >bindBtn->setEnabled(false); ui->stopBtn->setEnabled(true); ui->comboTargetIp->setEnabled(true);
}
else
{ ui->plainTextEdit->appendPlainText("**Port binding failed"); }
}
void MainWindow::on_stopBtn_clicked()
{//Exit multicast
udpSocket->leaveMulticastGroup(groupAddress);//Exit multicast
udpSocket->abort();
ui->bindBtn->setEnabled(true);
ui->stopBtn-> setEnabled(false);
ui->comboTargetIp->setEnabled(true);
ui->plainTextEdit->appendPlainText("** has quit multicast, unbind the port");
}
void MainWindow::on_btnSend_clicked()
{//发送组播消息
quint16 groupPort = ui->spinBox->value();
QString msg = ui->lineEdit->text();
QByteArray array;
array = msg.toUtf8();
udpSocket->writeDatagram(array,groupAddress,groupPort);
ui->plainTextEdit->appendPlainText("[multicst]"+msg);
ui->lineEdit->clear();
ui->lineEdit->setFocus();
}
void MainWindow::on_clearBtn_clicked()
{
ui->plainTextEdit->clear();
}
void MainWindow::on_quitBtn_clicked()
{ this->close(); } void MainWindow::onSocketReadyRead() {//Read datagram QByteArray datagram; datagram.resize(udpSocket->pendingDatagramSize()); QHostAddress peerAddr; quint16 peerPort ; udpSocket->readDatagram(datagram.data(),datagram.size(),&peerAddr,&peerPort); QString str =datagram.data(); QString peerStr = "[From"+peerAddr.toString()+":"+ QString::number(peerPort)+"]"; ui->plainTextEdit->appendPlainText(peerStr); } QString MainWindow::getLocalIp() {//Get local IP QString hostName = QHostInfo::localHostName();// local hostname
QHostInfo hostInfo = QHostInfo::fromName(hostName);
QString localIP = " ";
QList<QHostAddress> addList = hostInfo.addresses();
if(!addList.isEmpty())
{
for(int i=0;i<addList.count();++i)
{
QHostAddress aHost = addList.at(i);
if(QAbstractSocket::IPv4Protocol == aHost.protocol())
{
localIP = aHost.toString();
break;
}
}
}
return localIP;
}
void MainWindow::onSocketStateChange(QAbstractSocket::SocketState socketState)
{//socket状态变化
switch(socketState)
{
case QAbstractSocket::UnconnectedState:
{
LabSocketState->setText("socket状态:UnconnectedState");
break;
}
case QAbstractSocket::HostLookupState:
{
LabSocketState->setText("socket状态:HostLookupState");
break;
}
case QAbstractSocket::ConnectingState:
{
LabSocketState->setText("socket状态:ConnectingState");
break;
}
case QAbstractSocket::ConnectedState:
{
LabSocketState->setText("socket状态:ConnectedState");
break;
}
case QAbstractSocket::BoundState:
{
LabSocketState->setText("socket状态:BoundState");
break;
}
case QAbstractSocket::ClosingState:
{
LabSocketState->setText("socket状态:ClosingState");
break;
}
case QAbstractSocket::ListeningState:
{
LabSocketState->setText("socket状态:ListeningState");
break;
}
}
}
MainWindow::~MainWindow()
{
delete ui;
udpSocket = NULL;
delete udpSocket;
}