Rust

Get a Remote FTP File's Size by Name

Demonstrates the Chilkat Ftp2.GetSizeByName method, which returns the size in bytes of a named file in the current remote directory as a 32-bit integer. The only argument is the filename — a name, not a path. It returns -1 when the file is not found or the size cannot be obtained.

Background: This is the direct way to get one file's size when you already know its name, typically via a SIZE command — no full directory listing required. Because the result is 32-bit, it cannot represent files past about 2 GB; use GetSizeStrByName for large files. The argument must be a bare filename in the current directory, so ChangeRemoteDir to the right place first.

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Rust


// Demonstrates the Ftp2.GetSizeByName method, which returns the size in bytes of a named file in
// the current remote directory as a 32-bit integer.  The only argument is the filename (a name,
// not a path).

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;
}

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

// Returns -1 when the file is not found or the size cannot be obtained.  For files that may
// exceed 2 GB, use GetSizeStrByName (returns a decimal string).
let file_size = ftp.get_size_by_name("report.pdf");
if file_size < 0 {
    println!("File not found, or size unavailable.");
    return;
}

println!("report.pdf is {} bytes", file_size);

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