Perl

Download an FTP File to a Stream

Demonstrates the Chilkat Ftp2.GetFileToStream method, which downloads a remote file and writes its bytes to a Stream. The first argument is the remote file path and the second is the Stream, which must have a destination sink configured beforehand.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Streaming to a Stream object decouples the download from where the bytes ultimately go — a file (as here, via SinkFile), or a pipe feeding another component such as a decompressor or a hashing routine — and processes the data as it arrives rather than buffering the whole file. That keeps memory flat for large downloads and lets you chain the transfer into a processing pipeline.

Chilkat Perl Downloads

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Perl

use chilkat();

$success = 0;

#  Demonstrates the Ftp2.GetFileToStream method, which downloads a remote file and writes its
#  bytes to a Stream.  The 1st argument is the remote file path and the 2nd is the Stream.

$ftp = chilkat::CkFtp2->new();

$ftp->put_Hostname("ftp.example.com");
$ftp->put_Username("myFtpLogin");

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
$ftp->put_Password("myPassword");

$success = $ftp->Connect();
if ($success == 0) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

#  Configure the stream's destination sink before downloading.  Here the stream writes to a
#  local file.
$fileStream = chilkat::CkStream->new();
$fileStream->put_SinkFile("qa_output/report.pdf");

$success = $ftp->GetFileToStream("public_html/report.pdf",$fileStream);
if ($success == 0) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

print "Downloaded to stream." . "\r\n";

$success = $ftp->Disconnect();
if ($success == 0) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}