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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!

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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

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

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