QSerialPort device not open display

[zodd]

Hello,

I use QSerialPort and I don't manage to display the information "QIODevice::write (QSerialPort): device not open" when I try to send some data if the serial port is not yet open. I can see the message in the output application of Qt Creator, but the SIGNAL(errorOccurred(QSerialPort::SerialPortError) is not emit; I guess it's because the serial port is not yet open?

I've got this source code (everything else is working well when I open the serial port):

connect(uart, SIGNAL(errorOccurred(QSerialPort::SerialPortError)), this, SLOT(handleError(QSerialPort::SerialPortError)));
 
...
 
void UART::handleError(QSerialPort::SerialPortError error)
{
    if (error == QSerialPort::ResourceError)
    {
        emit errorDetected(uart->errorString()); //emit error string to the GUI
        if(uart->isOpen())
        {
            uart->close();
        }
 
    }
}

connect(uart, SIGNAL(errorOccurred(QSerialPort::SerialPortError)), this, SLOT(handleError(QSerialPort::SerialPortError)));

...

void UART::handleError(QSerialPort::SerialPortError error)
{
    if (error == QSerialPort::ResourceError)
    {
        emit errorDetected(uart->errorString()); //emit error string to the GUI
        if(uart->isOpen())
        {
            uart->close();
        }

    }
}

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Do you have a clue?
Thanks