[Development] [QIODevice]How to correctly treat/understand of the documentation?

[Thiago Macieira]

Em sex 18 abr 2014, às 18:14:43, Denis Shienkov escreveu:
> Hi.
> 
> I once again fluently look source codes of Qt and I see that the only one
> I/O class which supports a buffered mode is QTcpSocket (i.e.
> QAbstractSocket in buffered mode); in which is used the "deferred" writing
> for data transfer.
> 
> Thus, whether can I take such behavior (with "deferred" writing) as a basis
> for implementation of I/O in QtSerialPort where only buffered mode is used
> (as in QTcpSocket) ?
> 
> Because I don't see other precedents and examples which to take as a basis.

QProcess is also like that.

In both cases, the underlying I/O mechanism cannot take unlimited amounts of 
data. The OS will only receive a certain number of bytes from the application 
before saying "no more". So the writeData() functions for those two classes 
must be able to buffer everything that can't be written immediately.

Why it doesn't write immediately, I don't know. It was like that when I 
arrived in 2006.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center