Perl:文件夹为空时不创建空的最终文件

时间:2013-11-07 20:46:44

标签: perl

我有以下脚本从jpgs制作pdf。它工作正常,但当文件夹为空或没有jps时,它会创建并清空pdf文件。如何避免呢?

#!/usr/bin/perl

use PDF::API2;
use strict;

# assume all just one directory path
my $folder = join(' ', @ARGV);

# deal with dos paths
$folder =~ s|\\|/|g;

$folder =~ s|/$||;

my $pdf_file = $folder . '.pdf';

die "Not a folder!\n" unless -d $folder;
die "There's already a pdf of that name!\n" if -f $pdf_file;

my $pdf = PDF::API2->new;

opendir DIR, $folder;
while(my $file = readdir DIR) {
    next unless $file =~ /\.je?pg$/i;
    my $jpg = $folder . '/' . $file;

    my $image = $pdf->image_jpeg($jpg);
    my $page = $pdf->page();
    $page->mediabox(0,0,$image->width, $image->height);
    $page->trimbox(0,0,$image->width, $image->height);
    my $gfx = $page->gfx;
    $gfx->image($image, 0, 0);
}
close DIR;

$pdf->saveas($pdf_file);

1 个答案:

答案 0 :(得分:3)

我相信您可以使用glob执行某些操作,但可以更轻松地添加

my $someFilesFound;
在while循环之前

。在循环体中将其设置为1并在调用saveas之前对其进行测试。