[Interest] Parsing data from serialport

Andre Hartmann andre.hartmann at iseg-hv.de
Tue Apr 9 08:21:15 CEST 2019


Hi Martin,

> What is, when I ignore the ready read? 

The data will stay in the buffer, of course.

> Has the internal buffer a max size? 

Your RAM or 2^32, whichever is lower.

> Because at the moment I have a memory leak and maybe it comes from 
> that?

I doubt that. A leak would mean, you cannot use the data anymore, which 
is wrong here - you just need to fetch the data from the buffer.

Regards,
André

> 
> Martin
> 
> Am Fr., 5. Apr. 2019 um 21:12 Uhr schrieb Konstantin Shegunov 
> <kshegunov at gmail.com <mailto:kshegunov at gmail.com>>:
> 
>     On Thu, Apr 4, 2019 at 6:42 PM Jérôme Godbout <godboutj at amotus.ca
>     <mailto: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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