Rust

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.

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Rust


// 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.

let ftp = chilkat::Ftp2::new();

ftp.set_hostname("ftp.example.com");
ftp.set_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.set_password("myPassword");

if ftp.connect().is_err() {
    println!("{}", ftp.last_error_text());
    return;
}

// Configure the stream's destination sink before downloading.  Here the stream writes to a
// local file.
let file_stream = chilkat::Stream::new();
file_stream.set_sink_file("qa_output/report.pdf");

if ftp.get_file_to_stream("public_html/report.pdf", &file_stream).is_err() {
    println!("{}", ftp.last_error_text());
    return;
}

println!("Downloaded to stream.");

if ftp.disconnect().is_err() {
    println!("{}", ftp.last_error_text());
    return;
}