From: nagai@...
Date: 2003-01-29T21:52:24+09:00
Subject: Re: tkgnuplot problem: fork() on win (popen3 for windows?)

Hi,

From: Ralf <lausianne@gmx.net>
Subject: Re: tkgnuplot problem: fork() on win (popen3 for windows?)
Date: Wed, 29 Jan 2003 18:05:11 +0900
Message-ID: <3e379486$1@epflnews.epfl.ch>
> Now I get this:
> C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:105:in `write': Invalid 
> argument (Errno::EINVAL)
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:105:in `_send_cmd'
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:96:in `synchronize'
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:96:in `_send_cmd'
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:154:in `cmd'
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:184:in `set'
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:88:in `method_missing'
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:420
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:419:in `synchronize'
> 	from C:\Program Files\ruby\tkgnuplot\gnuplotP.rb:419
> Completed(1)

Hmm...
It maybe fail to start gnuplot process. 
The test routine on gnuplot.rb is witten for X environment. 
Therefore, if gnuplot on windows does not support '-geometry' option, 
fail to create a gnuplot process on line 416
( gp = GnuplotProcess.new('geometry'=>'500x200') ).

Please try the following check on irb.

irb(main):001:0> require './gnuplot.rb'
irb(main):002:0> gp = GnuplotProcess.new
irb(main):003:0> gp.cmd('plot sin(x)')

If you get a graph of a sin wave, you are ready to use TkGnuplot.rb.
But, it depends on win32_popen whether tkgnuplot.rb works collectry.
If there is a buffering problem, tkgnuplot.rb may have been hunged up.

# Original gnuplot.rb sets sync mode of subprocess's stdout to true
# before exec 'gnuplot'. 
-- 
                                  Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)