[Interest] Parsing data from serialport

Konstantin Shegunov kshegunov at gmail.com
Fri Apr 5 21:10:36 CEST 2019

On Thu, Apr 4, 2019 at 6:42 PM Jérôme Godbout <godboutj at amotus.ca> wrote:

> You jus did the same loop into your slot, the function I did made can be
> called as slot to the connect you just told, I agree the
> serial_port->waitForReadyRead(5); is not necessary, just often the
> transmission have partial or bunch of data by small burst (USB VCOM) and
> was handy for me, but it is not ncessary in any way.
A similar loop yes, however your loop goes until there's something to read
on the port, mine is run a few times only when the port already has some
information pending in its buffer. The QSerialPort class already knows if
data has arrived and buffers it*, so what would be the point to loop over
the port when there's no data? When you talk with someone do you ask every
5ms if [s]he has something to say to you? I really doubt it. You'd normally
just wait for something to be said to decide if and how to respond to it.

> Side note: ReadLines made it less general purpose, you will need a
> protocol that use endline to signal end of message which is not always the
> case.
Involving realistic protocol handling is another kettle of fish. It would
require much more thought and effort and is beyond the scope of what was
asked initially.

* Unless it's in unbuffered mode, as Thiago already noted.

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