QT file to download, send and receive dialogue, sub-thread receiving function realization

After reading the file download button clicks to complete, by Jeson it has been converted into a string format needed.

The string unified storage to QStringList, the download time, dialogue is the right to send the next packet.

If the timeout, timeout times is displayed, the sixth is no longer retransmission timeout, direct termination.

/**
 * @brief appendToRecord
 * @param array
 * @param type
 *  RECORD_ALL = 0,
    RECORD_SEND = 1,
    RECORD_RECV = 2,
    RECORD_REPORT = 3,
    RECORD_TIMEOUT = 4
 */
void UpdateWidget::appendToRecord(const QByteArray &array, int type)
{
    static int historyValue = 0;
    if(downLoadFlag == true)
    {
        QJsonObject  json;
        if(type == 4) //3.3 接收回复超时处理
        {
            //判断是否为当前包超时，是当前包则继续计数，不是当前包则重新计数
            if(historyValue != nextValue)
            {
                historyValue = nextValue;
                retryNum = 0;
                retryNum++;
                textdis->append(QString("%1,当前包回复超时次数为：%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg(retryNum));
            }
            else {
                retryNum++;
                textdis->append(QString("%1,当前包回复超时次数为：%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg(retryNum));
            }
            //判断当前包超时次数，超过5次则放弃下载
            if(retryNum > 5)
            {
                textdis->append(QString("%1,%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg("对方无回复，终止下载！"));
                loadStringList->clear();
                retryNum = 0;
                downLoadFlag = false;
                return;
            }
            //判断当前下载包序号，有针对性重发，nextValue初始为0，收到第一个回复则变为2
            if(nextValue == 0)
            {
                emit viewTransmitData("FirmWare", "Download", loadStringList->at(0), 1);
            }
            else {
                emit viewTransmitData("FirmWare", "Download", loadStringList->at(nextValue-1), 1);
            }
        }
        if(arrayToJsonObject(QString(array), json))
        {
            //1、检测ident字段是否为 "FirmWare"
            if((jsonIdentCheck(TBox_Download_TAG, json) != false)
                    && (jsonMethodCheck(Method_Response, json) == true))
            {
                if(json.contains(TBox_Param_TAG) != true
                        || json.value(TBox_Param_TAG).isObject() != true)
                {
                    return ;
                }
                QJsonObject paramObj = json.value(TBox_Param_TAG).toObject();
                //2、读取消息中的值,根据回复情况继续下载或者终止下载
                resultValue = paramObj.value(Download_Result).toInt();//getStringValueByKey(Download_Result, json);
                if(resultValue == 0)
                {
                    seqValue = paramObj.value(Download_Seq).toInt();
                    nextValue = paramObj.value(Download_Next).toInt();
                    if(seqValue < total) // 发送未结束，发送下一个包
                    {
                        emit viewTransmitData("FirmWare", "Download", loadStringList->at(nextValue-1), 1);
                        DLoadBar->setValue(seqValue); //设置当前进度条值
                        textdis->append(QString("%1,已发送：当前/总数= %2/%3").arg(QTime::currentTime().toString("HH:mm:ss")).arg(seqValue).arg(total));
                        textdis->moveCursor(QTextCursor::End); //textdis显示最新消息
                    }
                    else  // 发送完成，更新状态，停止发送
                    {
                        DLoadBar->setValue(int(total)); //设置当前的运行值为100%
                        textdis->append(QString("%1,%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg("下载完成！"));
                        textdis->moveCursor(QTextCursor::End); //textdis显示最新消息
                        loadStringList->clear();
                        downLoadFlag = false;
                        return;
                    }
                }
                else if(resultValue == 1)
                {
                    reasonValue = paramObj.value(Download_Reason).toString();
                    textdis->append(QString("%1,接收设备处理数据包失败，终止下载！ reason:%2").
                                    arg(QTime::currentTime().toString("HH:mm:ss")).arg(reasonValue));
                    loadStringList->clear();
                    downLoadFlag = false;
                    return;
                }
            }
        }

    }
}

Here is the action of the download button.

1. determine whether there is a file path, and if so, to read the file; if not, let the user choose.

2. Set the size of the progress bar, transmits a first data packet.

3. Open the downloaded flag.

/**
 * @brief UpdateWidget::onBtnLoadClicked
 */
void UpdateWidget::onBtnLoadClicked()
{
    if(fileName.isEmpty())
    {
      textdis->append(QString("%1,%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg("请先选择文件！"));
    }
    else
    {
        readfile();
        DLoadBar->setRange(0,total); //设置进度条最小值和最大值(取值范围)
        textdis->append(QString("%1,%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg("开始下载！"));
        emit viewTransmitData("FirmWare", "Download", loadStringList->at(0), 1);
        downLoadFlag = true; //打开下载标志位
    }
}

Here is a function to read the file, file selection has been achieved under the action of the Browse button.

void UpdateWidget::readfile()
{
    //读取文件
    binFile = new QFile(fileName);
    binFile->open (QIODevice::ReadOnly);
    allDataArray = binFile->readAll();

    //1.初始化计数参数和存储容器
    int crc=0, length=512, listSeq=1;
    QString datastring;
    QByteArray temdata;
    loadStringList = new QStringList;
    int binfileseek = 0;

    //计算下载数据包数量total
    if(dataLen%512 >0)
    { total = (dataLen/512)+1; }
    else
    { total = dataLen/512;  }
    textdis->append(QString("%1,%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg("开始读取！"));

    //2.1 装填发送包
    for(int i=0; i<=total; i++)
    {
        if(binfileseek >= dataLen) //2.1.1 已经全部装填
        {
            textdis->append(QString("%1,%2").arg(QTime::currentTime().toString("HH:mm:ss")).arg("读取完成！"));
            binfileseek = 0;
            allDataArray.clear();
            binFile->close();
        }
        else if((dataLen-binfileseek) > length) //2.1.2 还有大于一包没装填
        {
            for (int i=0; i<length; i++, binfileseek++)
            { temdata[i] = allDataArray.at(binfileseek); }
        }
        else  //2.1.3 还有最后一包没装填
        {
            int lastdata = dataLen-binfileseek;
            for (int i=0; i<lastdata; binfileseek++, i++)
            { temdata[i] = allDataArray.at(binfileseek); }
        }
        //2.1.4 发送包格式转换
        datastring.prepend(temdata);
        temdata.clear();
        Command *cmd = new Command;
        QString loadData = cmd -> prepareLoadingData(QString(total), QString(listSeq), QString(crc), datastring);
        datastring.clear();
        loadStringList->append(loadData);
        loadData.clear();
        listSeq++;
        qDebug() << "loadStringList:" << loadStringList->at(i);
    }
}