Re: getting stdout and stderr for system calls on windows
- From: Damphyr <damphyr@xxxxxxxxxxx>
- Date: Fri, 9 Dec 2005 06:58:48 +0900
I ended up with the following after this discussion. It doesn't separate stderr and stdout, but for what I want it, it's more than enough. And I added crude benchmarking as well:) :
There was also an exitcode method in there (you can get the exitcde from @process).
#Executes a command on a dos shell, redirecting stderr to stdout ("2>&1")
#
#You can then access the output and the return value for the command.
#
#This is meant as a last-resort replacement for popen3 (because of problems with VC++6.0 and the Ruby One-Click Installer).
#
#_exec_time_ provides the Time spent running the command.
class ExecCmd
attr_reader :output,:cmd,:exec_time
#When a block is given, the command runs before yielding
def initialize cmd
@output=""
@exec_time=0
@cmd=cmd
@cmd_run=cmd+" 2>&1" unless cmd=~/2>&1/
if block_given?
run
yield self
end
end
#Runs the command
def run
t1=Time.now
IO.popen(@cmd_run){|f|
@output=f.read
@process=Process.waitpid2(f.pid)[1]
}
@exec_time=Time.now-t1
end
#Returns false if the command hasn't been executed yet
def run?
return false unless @process
return true
end
#Returns true if the command was succesfull.
#
#Will return false if the command hasn't been executed
def success?
return @process.success? if @process
return false
end
end
www-data wrote:
I have the same problem, and i'm likely going to end up using this syntax inside a system call:
(((dmake target | tee stdout.txt) 3>&1 1>&2 2>&3 | tee stderr.txt) 3>&1 1>&2 2>&3) 2>&1 | tee output.txt
where output.txt will contain stderr + stdout stdout.txt will contain stdout stderr.txt will contain stderr
There is a description of how this works here:
http://www.cpqlinux.com/redirect.html
Scroll down to "Capturing stderr with tee Swapping stderr and stdout"
Ugly as hell but it does the trick... hopefully someone knows a cleaner way to do this within ruby?
--
ara.t.howard wrote:
On Thu, 24 Nov 2005, Damphyr wrote:
system 'echo blabla' stdout.
Cheers, V.-
i was working on this at one point:
harp:~ > cat a.rb
class Redirector
require "tempfile"
attr_accessor "ruby"
def initialize
@ruby = "ruby"
@script = tempfile
@script.write <<-ruby
stdout, stderr = ARGV.shift, ARGV.shift
File::unlink out rescue nil
File::unlink err rescue nil
STDOUT.reopen(open(stdout,"w"))
STDERR.reopen(open(stderr,"w"))
system(ARGV.join(' '))
ruby
@script.close
end
def run command, redirects = {}
stdout = redirects.values_at("stdout", :stdout, "o", :o, 1).compact.first
tout = nil
unless stdout
tout = tempfile
stdout = tout.path
end
stderr = redirects.values_at("stderr", :stderr, "e", :e, 2).compact.first
terr = nil
unless stderr
terr = tempfile
stderr = terr.path
end
system "#{ @ruby } #{ @script.path } #{ stdout } #{ stderr } #{ command }"
ret = IO::read(stdout), IO::read(stderr), $?.exitstatus
tout.close! if tout
terr.close! if terr
ret
end
def tempfile
Tempfile::new(Process::pid.to_s << rand.to_s)
end
end
redirector = Redirector::new
stdout, stderr, exitstatus = redirector.run "echo 42" p [stdout, stderr, exitstatus]
redirector.run "echo 42", 1 => "out", 2 => "err" p [IO::read("out"), IO::read("err")]
harp:~ > ruby a.rb ["42\n", "", 0] ["42\n", ""]
regards.
-a
-- http://www.braveworld.net/riva
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