loss of data while ftp using NET::FTP in perl.
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© March 2006 prapanna
Author: prapanna
Date: Wed Mar 22 20:27:36 2006
Subject: loss of data while ftp using NET::FTP in perl.
I have a simple script which does login, cwd and get - for a tar.gz file. But if file size goes beyond some limit, the resulting file seems to loose a few 100 bytes.
E.g:
On FTP server: 12685981 Mar 22 11:50 test.tgz
File pulled using per: 12685778 Mar 22 12:02 test.tgz
Not sure where I am going wrong. I would appreciate if you could give some pointers. Thanks.
Prapanna.
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Wed Mar 22 22:14:52 2006: 1809 TonyLawrence
Did you set BINARY mode?
Thu Mar 23 18:58:09 2006: 1813 prapanna
Yes. Here's the script:
#!/usr/bin/perl -w
use Net::FTP;
my $ftp = Net::FTP->new("ftp.mydomain.com") or die "\nINFO: Cann't connect";
$ftp->binary();
$ftp->login("myid","mypasswd") or die "\nINFO: Failed to login";
print "\nINFO: Login successful. Now getting...";
$ftp->cwd("mydir") or die "\nINFO: Couldn't change directory\n";
$ftp->get("test.tgz");
$ftp->quit;
print "\ndone\n";
I also tried it without binary. But the problem persists. BTW, the 'put' for the same tarball goes thru perfectly fine.
Thu Jun 8 15:52:06 2006: 2083 anonymous
We saw the similar issue in our application. This was caused due to the link speed was reduced from 100mbps to 10mbps.
May be you would like to check on your link speed.
Wed Jun 21 22:47:00 2006: 2141 anonymous
the problem is that you are calling the binary method before authenticating with the ftp server...so you are really using ascii
move the binary line below the login line and you should be fine
Wed Jun 21 23:03:27 2006: 2142 TonyLawrence
Good catch!
Thanks!
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