KProcess Line Mode Patch

Thiago Macieira thiago at
Tue Dec 2 16:14:00 GMT 2008

On Tuesday 02 December 2008 16:23:59 Ralf Habacker wrote:
> When searching for readyReadStandardOutput on
> shows I got 130
> references in 81 files.
> Inspecting them shows several problematic implementations of our related
> topic

You pasted one issue with line-oriented reading (you have to use the readLine 
overload that returns qint64 if your device is sequential, like QProcess) and 
the rest are encoding issues.

The encoding issues are properly solved with QTextStream, since it maintains 
the encoder status correctly. Unterminated UTF-8 sequences would be delayed 
until the next read. In fact, unterminated sequences of any encoding.

But, as Oswald pointed out, the problem is that QTextStream isn't suitable for 
sequential devices. That's something to be fixed in Qt. (make sure that all 
device reads check for return == 0, which indicates incomplete data)

If anyone wants to give a go, I'm offering to run the unit tests for 

(Dammit, we should have released the whole testsuite already...)
Thiago Macieira - thiago (AT) - thiago (AT)
  Senior Software Engineer - Nokia, Qt Software
  Qt Software is hiring - ask me
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