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Re^4: File Properties/attributes in Win32

by BrowserUk (Pope)
on Mar 14, 2006 at 12:24 UTC ( #536548=note: print w/ replies, xml ) Need Help??


in reply to Re^3: File Properties/attributes in Win32
in thread File Properties/attributes in Win32

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?
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In the absence of evidence, opinion is indistinguishable from prejudice.


Comment on Re^4: File Properties/attributes in Win32
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Re^5: File Properties/attributes in Win32
by PodMaster (Abbot) on Mar 15, 2006 at 05:24 UTC
    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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