//發(fā)送udp
void MainWindow::sendMess(){
    QByteArray receBuffer;//創(chuàng)建接收字節(jié)流
    QBuffer bufferDevice(&receBuffer);//
    bufferDevice.open(QIODevice::WriteOnly);//打開緩沖區(qū)，寫入字節(jié)流
    image.save(&bufferDevice,"png");//圖像保存為指定類別
    QHostAddress address("192.168.1.100");//創(chuàng)建IP地址
    quint16 port =1234;//創(chuàng)建端口號
    sendUdp->writeDatagram(receBuffer,QHostAddress::Broadcast,port);//將圖片轉為字節(jié)流發(fā)送到指定地址、端口
    sendUdp->flush();
    qDebug()<<"發(fā)送字節(jié)流："<<receBuffer.size();
}
 
//選擇圖像
void MainWindow::on_pBtn_selectImage_clicked()
{
    ui->label->setText("");//清空文本
    //打開文件
    QString fileName=QFileDialog::
                     getOpenFileName(this,"open file",
                     QDir::currentPath(),"Image File(*.jpg *.png)");
    image.load(fileName);//導入圖片
    ui->label->setPixmap(QPixmap::fromImage(image));//將圖像顯示在標簽label
    ui->label->resize(image.width(),image.height());//根據(jù)圖像的大小調整顯示大小
 
}
 
//發(fā)送圖像
void MainWindow::on_pBtn_sendImage_clicked()
{
    sendUdp=new QUdpSocket(this);//創(chuàng)建字節(jié)套
    timerSend=new QTimer(this);
    connect(timerSend,&QTimer::timeout,this,&MainWindow::sendMess);//啟動定時器發(fā)送圖片信息
    timerSend->start(1000);//1s發(fā)一次
}
 
//停止發(fā)送
void MainWindow::on_pushButton_clicked()
{
    timerSend->stop();
    disconnect(timerSend,&QTimer::timeout,this,&MainWindow::sendMess);
    qDebug()<<"停止發(fā)送";
}

//接收udp
void MainWindow::udpRece(){
//    receUdp->waitForReadyRead(100);//等待10ms寫入
    while(receUdp->hasPendingDatagrams()){
        quint64 size=receUdp->pendingDatagramSize();//讀取字節(jié)流大小
        QByteArray receData;//創(chuàng)建接收字節(jié)流
        receData.resize(size);//改變與發(fā)送端的字節(jié)流大小一樣
        receUdp->readDatagram(receData.data(),receData.size());//讀取發(fā)送端的字節(jié)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()<<"接收端字節(jié)流大?。?<<receData.size();
    }
}
 
//開始接收連接
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";
}