From: Ralf <lausianne@...>
Date: 2003-01-31T03:23:02+09:00
Subject: Re: tkgnuplot problem: fork() on win (popen3 for windows?)



nagai@ai.kyutech.ac.jp wrote:
>>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)
> 
> It maybe fail to start gnuplot process. 
In Gordon Millers Gnuplot.rb this works to start gnuplot:

  @cmd = 'c:\program files\design\
	gnuplot\gp371w32\pgnuplot.exe' # path to *my* gnuplot
  @gnuplot = IO::popen(@cmd, "w")


> 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)')
> 
same error message as before ...

> # Original gnuplot.rb sets sync mode of subprocess's stdout to true
> # before exec 'gnuplot'. 
Sorry that I can't be of more help to fix this. It would need someone 
more Ruby-literate than myself ... at least "fork" seems not to be a 
problem.
cheers, Ralf.