Ruby POpen4错误倒带stderr

希望产生一个进程，我可以发出多个命令。希望调用一个bat文件为这个派生的流程设置一些环境变量，然后在不影响其他流程的情况下利用这些变量

最终在POPEN4上结束，这似乎正是我想要的，但在stderr.rewind的倒带上看到了一个错误

使用下面popen4提供的示例并查看以下输出

C:\>ruby envread.rb
pid        : 4452
stdout     : Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\>echo hello world!
hello world!

C:\>echo ERROR!  1>&2

C:\>
stderr     : ERROR!
C:/Ruby193/lib/ruby/gems/1.9.1/gems/POpen4-0.1.4/lib/popen4.rb:60:in `rewind': invalid argument (Errno::EINVAL)
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/POpen4-0.1.4/lib/popen4.rb:60:n `block in popen4'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/win32-open3-19-0.0.2/lib/win32/open3.rb:6:in `call'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/win32-open3-19-0.0.2/lib/win32/open3.rb:6:in `block in popen4'
    from C:/Ruby193/lib/ruby/1.9.1/open3.rb:208:in `popen_run'
    from C:/Ruby193/lib/ruby/1.9.1/open3.rb:90:in `popen3'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/win32-open3-19-0.0.2/lib/win32/open3.rb:5:in `popen4'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/POpen4-0.1.4/lib/popen4.rb:48:in `popen4'
    from envread.rb:8:in `<main>'

---

我做错了什么？

要求使用“win32/open3”并调用Open4.popen4似乎让我绕过了这个错误，但我仍然不知道为什么倒带会失败

> rewind → 0 click to toggle source Positions ios to the beginning of
> input, resetting lineno to zero.
> 
> f = File.new("testfile") f.readline   #=> "This is line one\n"
> f.rewind     #=> 0 f.lineno     #=> 0 f.readline   #=> "This is line
> one\n" Note that it cannot be used with streams such as pipes, ttys,
> and sockets.