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How can I pass File_Handle to a subroutine?

by Hanken (Acolyte)
on Jul 01, 2008 at 08:05 UTC ( #694901=perlquestion: print w/ replies, xml ) Need Help??
Hanken has asked for the wisdom of the Perl Monks concerning the following question:

Hi, Monks!
I got serval hash tables and I want to print them into separated files. So I write a sub and wanna pass a FILE_H to it. My code is:
open (FH_01 , ">", "file_01.txt" ) || die "open failed $!"; &hash2file(\%hash_regs, <FH_01>); # it dosen't work &hash2file(\%hash_regs, FH_01); # illegal syntax &hash2file(\%hash_regs, "file_01.txt"); # illegal syntax too
Can anybody tell me how to do it, or just give me some hints on how to quickly write different hashes into different files? Thanks!

Comment on How can I pass File_Handle to a subroutine?
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Re: How can I pass File_Handle to a subroutine?
by Burak (Chaplain) on Jul 01, 2008 at 08:11 UTC
    Try it as \*FH_01
Re: How can I pass File_Handle to a subroutine?
by psini (Deacon) on Jul 01, 2008 at 08:16 UTC

    Or try:

    open (my $FH_01 , ">", "file_01.txt" ) || die "open failed $!"; &hash2file(\%hash_regs, $FH_01); # it should work

    Rule One: "Do not act incautiously when confronting a little bald wrinkly smiling man."

      Oh, thanks, it works. BTW: what is the difference between $FH_01 and <FH_01>? I feel the data structure of <FH_01> is very confusing.

        $FH_01 is a scalar variable that holds a filehandle, you can use it to access (read, write, stat) the file. <FH_01> is actually a call to the readline function on the FH_01 filehandle (not the same as the $FH_01 variable!).

        --
        David Serrano

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