Hi,
If I understand documentation correctly, it suggests to connect
QIODevice::readyRead() signal to slot that will contain:
if(QIODevice::canReadLine)
{
QByteArray oneLine=QIODevice::ReadLine();
// process data here
}
--
Mariusz Zieliński different results.”
From: Martin Marmsoler [mailto:martin.marmso...@gmail.com]
Sent: 31 marca 2019 23:49
To: interest@qt-project.org
Subject: [Interest] Parsing data from serialport
Hello,
I'm trying to implement a serial connection with QIODevice (SerialPort). I
would like to parse line by line (each line consists of multiple columns of
data) and for this I found canReadLine().
But as I understand I have to use startTransaction, because otherwise the
buffer will not be used. I'm I correct?
bool QIODevice::canReadLine() const
{
Q_D(const QIODevice);
return d->buffer.indexOf('\n', d->buffer.size(),
d->isSequential() ? d->transactionPos :
Q_INT64_C(0)) >= 0;
}
So to read a full line, I have to open a QSerialPort and then start a
Transaction. Then I have to wait a little bit (till data is in the buffer) and
then I can use canReadLine. Am I correct? Is there a better way instead to wait
a little bit? Or is it the wrong way to go?
Best regards,
Martin
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