QWebsocket通信

QWebsocket的使用方法和QTcpSocket特别像。
1、定义一个QWebSocketServer。
2、监听IP和端口
m_webSocketServer->listen(QHostAddress(m_ipEdit->text()),m_portEdit->text().toInt());

3、创建接收客户端的信号槽。
connect(m_webSocketServer,SIGNAL(newConnection()),this,SLOT(slotNewConnect()));
4、如果有客户端连接，则做处理，如获取socket连接，关联接收槽。
QWebSocket* socket = m_webSocketServer->nextPendingConnection();
connect(socket,&QWebSocket::disconnected,this,[=](）
{});
connect(socket,&QWebSocket::textMessageReceived,this,[=](QString text)
{});
connect(socket,&QWebSocket::binaryMessageReceived,this,[=](QByteArray array)
{}；

发送文本：

            socket->sendTextMessage(m_sendEdit->text());

发送二进制数据：

        socket->sendBinaryMessage("IMGEND!");

发送图片：

    QByteArray array;
    QBuffer buffer(&array);
    buffer.open(QIODevice::WriteOnly);
    QPixmap pixmap(m_imgPath);
    pixmap.save(&buffer,"png");
    for (int i = 0; i < m_webSocketList.size() ;i++)
    {
        QWebSocket* socket = m_webSocketList.at(i);
        QString head = "IMGSTART!|"+m_imgPath.split("/").last();
        socket->sendBinaryMessage(head.toUtf8());
        socket->sendBinaryMessage(array);
        socket->sendBinaryMessage("IMGEND!");
    }

发送文件：

    m_blockSize = 64*1024;
    QFileInfo fileinfo(m_filePath);
    qint64 fileSize =  fileinfo.size();
    QString fileName = fileinfo.fileName();
    QString head = QString("FILESTART!|%1#%2").arg(fileName).arg(fileSize);
    QFile file(m_filePath);
    file.open(QIODevice::ReadOnly);
    qint64 sendSize = 0;
    m_progressDialog->setRange(0,100);
    m_progressDialog->setVisible(true);
    qDebug() <<QStringLiteral("当前客户端:")<<m_webSocketList.size();
    for (int i = 0; i < m_webSocketList.size() ;i++)
    {
        QWebSocket* socket = m_webSocketList.at(i);
        socket->sendBinaryMessage(head.toUtf8());
        QSslConfiguration config;
        config.setPeerVerifyMode(QSslSocket::VerifyNone);
        config.setProtocol(QSsl::AnyProtocol);
        socket->setSslConfiguration(config);
        qint64 writesize = fileSize;
        qint64 len = 0;
        do{
            QByteArray array = file.read(qMin(writesize,m_blockSize));
            len = socket->sendBinaryMessage(array);
            sendSize += len;
            writesize -= len;
            //由于发送太快，增加延时防止缓冲区来不及清理造成崩溃
            if (sendSize%(100*1024*1024) == 0)
            {
                QEventLoop eventloop;
                QTimer::singleShot(1000, &eventloop, SLOT(quit()));//3000表示3000ms，即3秒，可根据实际情况修改，其他的不用变
                eventloop.exec();
            }
            m_progressDialog->setValue(sendSize/(fileSize/100));
            qDebug() <<"sendsize:"<<sendSize;
        }while(writesize>0);
        if(sendSize == fileSize)//检验文件信息
        {
            qDebug() << QStringLiteral("文件发送完毕");
            socket->sendBinaryMessage("FILEEND!");
            file.close();
        }
    }

接收数据：```接收文本

connect(socket,&QWebSocket::textMessageReceived,this,[=](QString text)
{
    m_recEdit->append(QStringLiteral("接收：")+text);
    if (text == "Finish")
        emit signalRecFinish();
    qDebug()<<"------recv1"<<text;
});

``
接收数据：```接收二进制收据

connect(socket,&QWebSocket::binaryMessageReceived,this,[=](QByteArray array){
        //就收图片头部
        if (array.contains("IMGSTART!"))
        {
            m_rectype = IMGTYPE;
            m_pixName = QString(array).split("|").last();
            m_arr.clear();
        }
        //就收图片尾部
        else if (array == "IMGEND!")
        {
            QPixmap pixmap;
            pixmap.loadFromData(m_arr);
            m_imgLab->setPixmap(pixmap.scaled(m_imgLab->size(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
            m_pixName = m_pixName.remove("bak_");
            pixmap.save(QApplication::applicationDirPath()+"/"+m_pixName);
            m_arr.clear();
        }
        //接收文件头部
        else if (array.contains("FILESTART!"))
        {
            m_rectype = FILETYPE;
            QString str = array;
            str = str.split("|").last();
            QString fileName = str.section("#", 0, 0);
            m_fileSize = str.section("#", 1, 1).toDouble();
            m_recvSize = 0;

            m_file.setFileName(fileName.remove("bak_"));
            //打开文件
            bool isOK = m_file.open(QIODevice::WriteOnly);
            if(!isOK)
            {
                qDebug() << QStringLiteral("打开文件失败");
            }
            m_progressDialog->setRange(0,100);
            m_progressDialog->setVisible(true);
        }
        //接收文件尾部
        else if (array == "FILEEND!")
        {
//            if(m_recvSize == m_fileSize)
//            {
                qDebug() << QStringLiteral("实际")<< m_fileSize;

                QMessageBox::information(this, QStringLiteral("完成"), QStringLiteral("接收文件成功"));
                m_file.close();
//            }
        }
        else
        {
            //接收图片的二进制数据
            if (m_rectype == IMGTYPE)
            {
                m_arr.append(array);
            }
            //接收文件的二进制数据
            else if (m_rectype == FILETYPE)
            {
                qint64 len = m_file.write(array);
                m_recvSize += len;
                qDebug()  << QStringLiteral("接收") <<m_recvSize;
                m_progressDialog->setValue(m_recvSize/(m_fileSize/100));
            }
        }
    });