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Re^3: File Properties/attributes in Win32

by rafl (Friar)
on Mar 14, 2006 at 12:05 UTC ( #536539=note: print w/replies, xml ) Need Help??


in reply to Re^2: File Properties/attributes in Win32
in thread File Properties/attributes in Win32

I didn't actually try it as I don't own a Win32 box, but the source code tells me that.

Exporter doesn't seem to import the symbols in @EXPORT if you specify a list of symbols yourself. You can either not import the GetAttributes function, import all attributes yourself or use the attributes with their full name.

I also think you could bug the author of the module to create an export tag that allows you to import all attributes at once.

Flo

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Re^4: File Properties/attributes in Win32
by BrowserUk (Pope) on Mar 14, 2006 at 12:24 UTC

    This is one of several of the Win32::* 'standard' modules I've encountered that have a pretty peculiar way of exporting constants.

    In this case, they don't export the two quite specifically named functions into your namespace, but do export a dozen or so constants with very general names. But if you choose to import the function(s) you wish to use, the constants don't get exported!

    That leaves you either fully qualifying them (as functions) or importing them manually, or using the functions fully qualified and having this random set of constants scribbled over your namespace!

    To recap, you can do this:

    #! perl -slw use strict; use Win32::File qw[ GetAttributes ]; while( my $file = glob $ARGV[0] ) { GetAttributes( $file, my $attrs ); printf "%1s%1s%1s%1s%1s%1s%1s%1s%1s %s\n", ( $attrs & Win32::File::ARCHIVE() ) ? 'A' : ' ', ( $attrs & Win32::File::COMPRESSED()) ? 'C' : ' ', ( $attrs & Win32::File::DIRECTORY() ) ? 'D' : ' ', ( $attrs & Win32::File::HIDDEN() ) ? 'H' : ' ', ( $attrs & Win32::File::NORMAL() ) ? 'N' : ' ', ( $attrs & Win32::File::OFFLINE() ) ? 'O' : ' ', ( $attrs & Win32::File::READONLY() ) ? 'R' : ' ', ( $attrs & Win32::File::SYSTEM() ) ? 'S' : ' ', ( $attrs & Win32::File::TEMPORARY() ) ? 'T' : ' ', $file; }

    Or this:

    #! perl -slw use strict; use Win32::File; while( my $file = glob $ARGV[0] ) { Win32::File::GetAttributes( $file, my $attrs ); printf "%1s%1s%1s%1s%1s%1s%1s%1s%1s %s\n", ( $attrs & ARCHIVE ) ? 'A' : ' ', ( $attrs & COMPRESSED) ? 'C' : ' ', ( $attrs & DIRECTORY ) ? 'D' : ' ', ( $attrs & HIDDEN ) ? 'H' : ' ', ( $attrs & NORMAL ) ? 'N' : ' ', ( $attrs & OFFLINE ) ? 'O' : ' ', ( $attrs & READONLY ) ? 'R' : ' ', ( $attrs & SYSTEM ) ? 'S' : ' ', ( $attrs & TEMPORARY ) ? 'T' : ' ', $file; }

    Or this:

    #! perl -slw use strict; use Win32::File qw[ GetAttributes ARCHIVE COMPRESSED DIRECTORY HIDDEN NORMAL OFFLINE READONLY SYSTEM TEMPORARY ]; while( my $file = glob $ARGV[0] ) { GetAttributes( $file, my $attrs ); printf "%1s%1s%1s%1s%1s%1s%1s%1s%1s %s\n", ( $attrs & ARCHIVE ) ? 'A' : ' ', ( $attrs & COMPRESSED) ? 'C' : ' ', ( $attrs & DIRECTORY ) ? 'D' : ' ', ( $attrs & HIDDEN ) ? 'H' : ' ', ( $attrs & NORMAL ) ? 'N' : ' ', ( $attrs & OFFLINE ) ? 'O' : ' ', ( $attrs & READONLY ) ? 'R' : ' ', ( $attrs & SYSTEM ) ? 'S' : ' ', ( $attrs & TEMPORARY ) ? 'T' : ' ', $file; }

    Or this:

    #! perl -slw use strict; use Win32::File (); while( my $file = glob $ARGV[0] ) { Win32::File::GetAttributes( $file, my $attrs ); printf "%1s%1s%1s%1s%1s%1s%1s%1s%1s %s\n", ( $attrs & Win32::File::ARCHIVE() ) ? 'A' : ' ', ( $attrs & Win32::File::COMPRESSED()) ? 'C' : ' ', ( $attrs & Win32::File::DIRECTORY() ) ? 'D' : ' ', ( $attrs & Win32::File::HIDDEN() ) ? 'H' : ' ', ( $attrs & Win32::File::NORMAL() ) ? 'N' : ' ', ( $attrs & Win32::File::OFFLINE() ) ? 'O' : ' ', ( $attrs & Win32::File::READONLY() ) ? 'R' : ' ', ( $attrs & Win32::File::SYSTEM() ) ? 'S' : ' ', ( $attrs & Win32::File::TEMPORARY() ) ? 'T' : ' ', $file; }

    None of which seem particularly satisfactory from either a 'quick script-DWIM' or a software engineering point of view.


    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
      Here's another radical idea :)
      use Win32::File; use Win32::File qw[ GetAttributes ];
      But I agree, the constants should have their own tag.

      MJD says "you can't just make shit up and expect the computer to know what you mean, retardo!"
      I run a Win32 PPM repository for perl 5.6.x and 5.8.x -- I take requests (README).
      ** The third rule of perl club is a statement of fact: pod is sexy.

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[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.
[Eily]: the overload version wouldn't return true with "$x" && !length $x though, I guess
[hippo]: The more I look at this code, the more $x is a plain old scalar and the more this condition will never be true. I'm calling it a bug at this point.
[hippo]: Thanks for your input which has soothed my sanity (a little)
[Corion]: Eily: Sure - if you force both things into stringy things, then you break that magic. But that would also mean that you changed the expression, as now $x = 0.00 will be true instead of false as it were before
[Corion]: Ah no, at least in my feeble experiments that doesn't change the meaning
[Corion]: We sell sanity in small packages ;)

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