Completion notification after completion of write the data in file through UART

Mohit Tripathi

Hi,

How to include the completion notification after completion of write the data in file through UART (serially)?
I want to show the completion notification in my application. I am storing the data in a file through UART(serially).
But, I don't know that how can I include that tab or notification my application?
The application, i am making for windows. The platform is Qt creator.

Thanks

aha_1980

@Mohit-Tripathi Please show the code you got so far.

Mohit Tripathi

Hi,

I am trying to implement this in terminal application. The code, i have attached is:

void SettingsDialog::on_pushButton_clicked()
{
const QStringList list = m_ui->serialPortInfoListBox->itemData(mohit).toStringList();
qDebug()<<list;
QList<QString> List;
List = list.mid(0,1);
qDebug()<<"COM:"<<List;
foreach(const QSerialPortInfo &info, QSerialPortInfo::availablePorts()){
    qDebug() << "Name  :" << info.portName();
    QString List1 = info.portName();
    qDebug() <<List1;
    serial->setPortName(List1);
}

//qDebug()<< QPair<QString, QString>( serial->portName(), tr( "%1: %2" ).arg( serial->portName(), serial->description() ) );
//serial->setPortName(List);
    serial->open(QSerialPort::ReadWrite);
    serial->setBaudRate(QSerialPort::Baud19200);
    serial->setDataBits(QSerialPort::Data8);
    serial->setParity(QSerialPort::NoParity);
    serial->setStopBits(QSerialPort::OneStop);
    serial->setFlowControl(QSerialPort::NoFlowControl);
    connect(serial,&QSerialPort::readyRead,this,&SettingsDialog::serialReceived);

    static const char mydata[] ={'M','N'};
    QByteArray sendPacket = QByteArray::fromRawData(mydata, sizeof(mydata));
   // QByteArray sendPacket("MN");
//    serial->write(sendPacket);
    sendPacket.resize(2);
    if(serial->isWritable())
    {

        serial->write(sendPacket.toStdString().c_str(), sendPacket.size());
        serial->flush();
        serial->waitForBytesWritten(100);
    }
    else
    {
        qDebug()<<"write to serial";
    }

}

void SettingsDialog::serialReceived()
{
    /*int data1  =0;
     char *dataBuffer;
     int size = arduino->bytesAvailable();
     dataBuffer = new char[size+1];
     data1 = arduino->read(dataBuffer,size);
     dataBuffer[data1]='\0';
     //delete dataBuffer;*/

    QStringList buffer_split = serialBuffer.split(",");
    if(buffer_split.length() < 3){
        serialData = serial->readAll();
        serialBuffer = serialBuffer + QString::fromStdString(serialData.toStdString());
        serialData.clear();
    }else{
        serialBuffer = "";
        qDebug() << buffer_split << "\n";
        //   Dialog::updatelcd1(buffer_split[0]);
        qDebug()<<"No reading";
    }

    QFile logFile("Data.txt");
    if (!logFile.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text))
        qFatal("Can't open the log file: %s", logFile.errorString().toLocal8Bit().constData());
    QTextStream log(&logFile);
     logFile.setObjectName("Log File");
    log << serialBuffer;
    log.flush();


   // QFile logFile("Data.txt");
   // logFile.open(QIODevice::ReadWrite);
    QTextStream in (&logFile);
    const QString content = in.readAll();
    if(!content.contains("+++++++++++++++++++++++++++++++++++++++++++"))
    {
        qDebug()<<"completed\n";
    }
    logFile.close();

}

aha_1980

@Mohit-Tripathi said in Completion notification after completion of write the data in file through UART:

QFile logFile("Data.txt");
if (!logFile.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text))
    qFatal("Can't open the log file: %s", logFile.errorString().toLocal8Bit().constData());
QTextStream log(&logFile);
 logFile.setObjectName("Log File");
log << serialBuffer;
log.flush();
// QFile logFile("Data.txt");
// logFile.open(QIODevice::ReadWrite);
QTextStream in (&logFile);
const QString content = in.readAll();
if(!content.contains("+++++++++++++++++++++++++++++++++++++++++++"))
{
qDebug()<<"completed\n";
}
logFile.close();

Can you explain what this code fragment is supposed to do?

Mohit Tripathi

Hi,

This code fragment is about, to create the file and store the data in "Data.txt" file which we are getting through UART. I can say that this is like log file.

Thanks

aha_1980

@Mohit-Tripathi

Yeah, but what is this part meant to be:

// QFile logFile("Data.txt");
// logFile.open(QIODevice::ReadWrite);
QTextStream in (&logFile);
const QString content = in.readAll();
if(!content.contains("+++++++++++++++++++++++++++++++++++++++++++"))
{
qDebug()<<"completed\n";
}
logFile.close();

?

Mohit Tripathi

@aha_1980

Yeah,

I have created the string in MCU "+++++++++++++++++++++++++++++++++++++++++++". When, I get this string in my file through UART, I get to know that the data has been pushed or not. This is basically like notification. Then, I am printing "completed", if the data has been pushed.
You can see that I am taking the data from "Data.txt" file only.

Thanks

aha_1980

@Mohit-Tripathi

So you get "++++++++++++++++++++" when the data is completely send? Because the condition implies the opposite (!contains()):

if(!content.contains("+++++++++++++++++++++++++++++++++++++++++++"))

But I can only advice you to not read and write the file alternating; that will destroy performance completely.

Back to your question: Why not simply emit a signal once the end condition is satisfied?

You already have the data in RAM, no need to write it in a file just to read it back afterwards for checking.

Mohit Tripathi

@aha_1980

Actually, I have data in SD card which is attached with MCU. I am taking those data through UART. I think, there is no way to take the data except UART. So basically, I want to store the SD card data after clicking on to the tab in my desktop application.

"Why not simply emit a signal once the end condition is satisfied?"
How can I do this? Can you please tell me?

Thanks

jsulm

@Mohit-Tripathi said in Completion notification after completion of write the data in file through UART:

How can I do this? Can you please tell me?

https://doc.qt.io/qt-5/signalsandslots.html