?? fig13_18.pl
字號:
#!/usr/bin/perl
# Figure 13.18: fig13_18.pl
# Passing filehandles to functions
use warnings;
use strict;
my $file = shift( @ARGV );
open( FILE, $file ) or die( "Error opening $file: $!" );
my $filehandle = *FILE;
readhandle( $filehandle );
close( FILE ) or die( "Error closing $file: $!" );
print( "\n\nNow a 2nd time...\n" );
open( FILE, $file ) or die( "Error opening $file: $!" );
$filehandle = \*FILE;
readhandle( $filehandle );
close( FILE ) or die( "Error closing $file: $!" );
print( "\n\nAnd finally...\n" );
readfile( $file );
sub readhandle
{
my $fh = shift();
print while ( <$fh> );
}
sub readfile
{
my $file = shift();
local *FILE;
open( FILE, $file ) or die( "Error opening $file: $!" );
print while ( <FILE> );
}
###########################################################################
# (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall. #
# All Rights Reserved. #
# #
# DISCLAIMER: The authors and publisher of this book have used their #
# best efforts in preparing the book. These efforts include the #
# development, research, and testing of the theories and programs #
# to determine their effectiveness. The authors and publisher make #
# no warranty of any kind, expressed or implied, with regard to these #
# programs or to the documentation contained in these books. The authors #
# and publisher shall not be liable in any event for incidental or #
# consequential damages in connection with, or arising out of, the #
# furnishing, performance, or use of these programs. #
###########################################################################
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