QT使用udp实现发送与接收图片

//发送udp
void MainWindow::sendMess(){
    QByteArray receBuffer;//创建接收字节流
    QBuffer bufferDevice(&receBuffer);//
    bufferDevice.open(QIODevice::WriteOnly);//打开缓冲区，写入字节流
    image.save(&bufferDevice,"png");//图像保存为指定类别
    QHostAddress address("192.168.1.100");//创建IP地址
    quint16 port =1234;//创建端口号
    sendUdp->writeDatagram(receBuffer,QHostAddress::Broadcast,port);//将图片转为字节流发送到指定地址、端口
    sendUdp->flush();
    qDebug()<<"发送字节流："<<receBuffer.size();
}
 
//选择图像
void MainWindow::on_pBtn_selectImage_clicked()
{
    ui->label->setText("");//清空文本
    //打开文件
    QString fileName=QFileDialog::
                     getOpenFileName(this,"open file",
                     QDir::currentPath(),"Image File(*.jpg *.png)");
    image.load(fileName);//导入图片
    ui->label->setPixmap(QPixmap::fromImage(image));//将图像显示在标签label
    ui->label->resize(image.width(),image.height());//根据图像的大小调整显示大小
 
}
 
//发送图像
void MainWindow::on_pBtn_sendImage_clicked()
{
    sendUdp=new QUdpSocket(this);//创建字节套
    timerSend=new QTimer(this);
    connect(timerSend,&QTimer::timeout,this,&MainWindow::sendMess);//启动定时器发送图片信息
    timerSend->start(1000);//1s发一次
}
 
//停止发送
void MainWindow::on_pushButton_clicked()
{
    timerSend->stop();
    disconnect(timerSend,&QTimer::timeout,this,&MainWindow::sendMess);
    qDebug()<<"停止发送";
}

//接收udp
void MainWindow::udpRece(){
//    receUdp->waitForReadyRead(100);//等待10ms写入
    while(receUdp->hasPendingDatagrams()){
        quint64 size=receUdp->pendingDatagramSize();//读取字节流大小
        QByteArray receData;//创建接收字节流
        receData.resize(size);//改变与发送端的字节流大小一样
        receUdp->readDatagram(receData.data(),receData.size());//读取发送端的字节流
        QBuffer receBuffer(&receData);//
        QImageReader reader(&receBuffer,"png");
        QImage receImage=reader.read();
        sence=new QGraphicsScene(ui->graphicsView);
        ui->graphicsView->setScene(sence);
        QGraphicsPixmapItem *pixmapItem=
                new QGraphicsPixmapItem(QPixmap::fromImage(receImage));
        sence->addItem(pixmapItem);
        qDebug()<<"接收端字节流大小："<<receData.size();
    }
}
 
//开始接收连接
void MainWindow::on_pBtn_receImage_clicked()
{
 
    timerRece=new QTimer(this);
    connect(timerRece,&QTimer::timeout,this,&MainWindow::udpRece);
    timerRece->start(1000);
//    receUdp=new QUdpSocket(this);
//    receUdp->bind(QHostAddress::Any,1234);
//    connect(receUdp,&QUdpSocket::readyRead,this,&MainWindow::udpRece);
}
 
//停止接收
void MainWindow::on_pBtn_stopRece_clicked()
{
    timerRece->stop();
    disconnect(timerRece,&QTimer::timeout,this,&MainWindow::udpRece);
    qDebug()<<"停止接收";
}