QTimer in a GUI application

[HamiltonQ]

Hi, Samuel!

This works, I tested. But my base class is QMainWindow. I tried to change the base class for QWiget but it happened several errors.

Thanks, man!

[SGaist]

Just keep your QMainWindow based class, the only thing that was important was the part related to the QTimer

[HamiltonQ]

I have to change the base class to use QTimer?

[JKSH]

Can you show us your code for doWork()?

Note that in newer versions of Qt, the actual message is "QObject::startTimer: Timers can only be used with threads started with QThread". ("Timers", not "QTimer"!)

All QObjects have built-in timers. I don't think the message came from your QTimer, but rather from your QSerialPort.

[SGaist]

No you don't, QMainWindow is a QWidget as well

[HamiltonQ]

[quote author="JKSH" date="1422056561"]Can you show us your code for doWork()?

Note that in newer versions of Qt, the actual message is "QObject::startTimer: Timers can only be used with threads started with QThread". ("Timers", not "QTimer"!)

All QObjects have built-in timers. I don't the message came from your QTimer, but rather from your QSerialPort.[/quote]

@void client::readFlightData(){

//QMessageBox::information(this,"", "txtReadFlightData");

serial->write("gFD;");

if (serial->waitForBytesWritten(timeout))
{

    if(serial->waitForReadyRead(timeout))
    {
        txtReadFlightData = serial->readAll();
        listReadFlightData = txtReadFlightData.split(";", QString::SkipEmptyParts);

        if(listReadFlightData.size()==7)
        {
            if(ui->SelectUnitsAmerican->isChecked()==1) // Unidades no SI
            {

                ui->txtPitch->setText(listReadFlightData[0]);
                ui->txtRoll->setText(listReadFlightData[1]);
                ui->txtHeightGPS->setText(QString::number(listReadFlightData[2].toDouble()));
                ui->txtHeightBarometer->setText(QString::number(listReadFlightData[3].toDouble()));
                ui->txtSpeedPitot->setText(QString::number(listReadFlightData[4].toDouble()));
                ui->txtSpeedGPS->setText(QString::number(listReadFlightData[5].toDouble()));
                ui->txtVerticalSpeed->setText(QString::number(listReadFlightData[6].toDouble()));

                countLostSerial = 0;
                listReadFlightData.clear();

            }else{ // U.S. Customary

                ui->txtPitch->setText(listReadFlightData[0]);
                ui->txtRoll->setText(listReadFlightData[1]);
                ui->txtHeightGPS->setText(QString::number(listReadFlightData[2].toDouble()*3.28084)); // Feet
                ui->txtHeightBarometer->setText(QString::number(listReadFlightData[3].toDouble()*3.28084)); // Feet
                ui->txtSpeedPitot->setText(QString::number(listReadFlightData[4].toDouble()*2.2369)); // Miles per hour
                ui->txtSpeedGPS->setText(QString::number(listReadFlightData[5].toDouble()*2.2369)); // Miles per hour
                ui->txtVerticalSpeed->setText(QString::number(listReadFlightData[6].toDouble()*2.2369)); // Miles per hour
                countLostSerial = 0;
                listReadFlightData.clear();

            }

        }else
            countLostSerial += 1;

    }

}

if(countLostSerial == 250){
    countLostSerial = 0;
    disconnectSerial();

}

}@

[HamiltonQ]

[quote author="JKSH" date="1422056561"]Can you show us your code for doWork()?

Note that in newer versions of Qt, the actual message is "QObject::startTimer: Timers can only be used with threads started with QThread". ("Timers", not "QTimer"!)

All QObjects have built-in timers. I don't the message came from your QTimer, but rather from your QSerialPort.[/quote]

Hey man, thanks for the help!

I think that's the problem. I did it:

@QThread * thread = new QThread ();
QSerialPort * = new serial QSerialPort ();
Serial-> moveToThread (thread);@

But nothing has changed. I keep getting:

@QObject :: startTimer: QTimer can only be used with threads started with QThread.@

Can you tell me what should I do? I searched for some topics but nothing they say solved the problem. Thanks a lot!!

[SGaist]

[quote author="HamiltonQ" date="1422400475"]
@QThread * thread = new QThread ();
QSerialPort * = new serial QSerialPort ();
Serial-> moveToThread (thread);@
[/quote]

Did you mean:

@
QThread * thread = new QThread ();
QSerialPort *serial = new QSerialPort ();
serial-> moveToThread (thread);
@
?

[HamiltonQ]

[quote author="SGaist" date="1422405461"][quote author="HamiltonQ" date="1422400475"]
@QThread * thread = new QThread ();
QSerialPort * = new serial QSerialPort ();
Serial-> moveToThread (thread);@
[/quote]

Did you mean:

@
QThread * thread = new QThread ();
QSerialPort *serial = new QSerialPort ();
serial-> moveToThread (thread);
@
?[/quote]

Hi SGaist!

Yes. I ended up writing wrong. I did it but did not work. Do you have any suggestion? Thaks!

[SGaist]

Just to be sure I'm understanding your code correctly: you are moving your QSerialPort instance to a thread and then using the blocking functions in your widget code ?