On Friday, June 18, 2010 7:23:19 PM UTC+3, Steven wrote:
> I am calling a ruby program from a python gui and using
> subprocess.Popen in Windows XP using python 2.6.  Unfortunately,
> whenever the ruby program is called a blank command window appears on
> screen, annoying my users.  Is there a way to suppress this behaviour?

> Below is a minimal program that demonstrates the problem.  The problem
> does not manifest if the python program is launched via the command
> line.  To duplicate launch from Windows Explorer by double-clicking on
> the python file.

> --- call_double.pyw ---
> from subprocess import *
> import time

> time.sleep(3) # to show that command window is result of call to Popen
> p = Popen(['ruby.exe', 'double.rb'], stdin=PIPE, stdout=PIPE,
> stderr=PIPE)
> results = open('results.txt', 'w')
> for n in range(10):
>     p.stdin.write("%d\n" % n)
>     result = p.stdout.readline().strip()
>     results.write('double(%s) => %2s\n' % (n, result))
> results.close()

> --- end of call_double.pyw ---

> --- double.rb ---
> while true
>     puts $stdin.gets().strip!.to_i * 2
>     STDOUT.flush
> end
> --- end of double.rb ---

> thanks for any help,
> Steven Rumbalski