[Qt-interest] newbie:facing issues with readallstdoutput andQProcess

[Thiago Macieira]

Em Segunda-feira 04 Maio 2009, às 20:43:01, Will Rutherdale (rutherw) 
escreveu:
> I've been testing QProcess on a Linux machine.  I have my Qt program run
> a script that does output to a mix of STDERR and STDOUT.  The Qt program
> connects to all the advertised signals in QProcess, and mostly works.
>
>  
>
> I read the QProcess documentation and accordingly called
> setProcessChannelMode( QProcess::MergedChannels ) before calling
> start().  
>
>  
>
> In my readyReadStandardOutput handler, I call readAllStandardOutput().
> This is supposed to get all the output of the script from both STDOUT
> and STDERR.  Unfortunately it only gets the output from STDERR.  The
> output from STDOUT appears not to be available anywhere.  If I modify
> the script and make all of its output go to STDERR, then the Qt program
> sees everything.
>
>  
>
> Is this a known bug in QProcess?

No. Please understand that stdout is buffered in C (and so is cout in 
iostream). So unless you flush the data, you won't see anything. Stderr, 
however, is not buffered, so anything you write will be seen.

This is a problem in the process you're running (the child process), not in 
QProcess.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
     Sandakerveien 116, NO-0402 Oslo, Norway
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