but I now meet a problem on Windows

I don't use windows, but I do remember a few recent discussions of non-blocking pipe reads on win32. The problem is that win32 dosn't handle non-blocking pipe reads easily. See the replies way down in these nodes, Non-blocking Reads from Pipe Filehandle and Please suggest a non-forking way to do this (OS: windows) and especially ikegami's reply in Re: Please suggest a non-forking way to do this (OS: windows) (solution) for some techniques to get around it.

I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re: IPC::Open3: differences among replies of a background process by zentara
in thread IPC::Open3: differences among replies of a background process by cramdorgi

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.