Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re^3: STDERR going to string

by Anonymous Monk
on Oct 10, 2011 at 13:38 UTC ( #930631=note: print w/ replies, xml ) Need Help??


in reply to Re^2: STDERR going to string
in thread STDERR going to string

If you want to capture STDIN/STDOUT/STDERR, you have to launch another process, see IPC::Run3, IPC::System::Simple


Comment on Re^3: STDERR going to string
Re^4: STDERR going to string
by philkime (Sexton) on Oct 11, 2011 at 08:21 UTC
    It's not really the output of an external command etc. I need. It's the STDERR of a C library which an XS module uses. So when I make certain sub calls, it gets into the C routines and it's their STDERR I want to capture. It all works fine on non-Windows using STDERR redirection to a file or Capture::Tiny but on Windows, the STDERR of the library refuses to be captured. This seems to be a windows specific thing - I read somewhere that re-opening STDERR on windows de-couples perl STDERR from the C library STDERR. If so, I'm really in the dark as to how to capture this.

      ...repetitive...I'm really in the dark as to how to capture this.

      Like I already said, launch a process

      perl foo.pl 1>my.stdout.txt 2>my.stderr.txt always works

        I don't think I understand how to do that in my case. I am in the middle of a large program and need to make some sub calls to some XS/external lib subs. There isn't anything I can really launch as an external processs here. Am I missing something? I know it'll always work if I redirect everything before I start but my problem is that I am already deep in some code at the point where I need to run some XS subs and get their STDERR.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://930631]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (9)
As of 2014-08-29 06:02 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The best computer themed movie is:











    Results (275 votes), past polls