Rust

Get a Remote FTP File's Size by Name as a String

Demonstrates the Chilkat Ftp2.GetSizeStrByName method, which returns the size in bytes of a named file in the current remote directory as a decimal string. The only argument is the filename.

Background: Returning the size as text avoids integer-width limits entirely, so this is the safe choice for a file of any size and for languages without a convenient large-integer type. Like the other by-name lookups it takes a bare filename in the current directory; parse the string when you need arithmetic, or use it directly for display.

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Rust


// Demonstrates the Ftp2.GetSizeStrByName method, which returns the size in bytes of a named file
// in the current remote directory as a decimal string.  The only argument is the filename.

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;
}

// The string form avoids integer-size limits, so it is safe for files of any size.
let Ok(file_size) = ftp.get_size_str_by_name("bigfile.zip") else {
    println!("{}", ftp.last_error_text());
    return;
};

println!("bigfile.zip is {} bytes", file_size);

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