Get a Remote File's Size as a String

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Demonstrates the Chilkat SFtp.GetFileSizeStr method, which returns a remote file's size in bytes as a decimal string. The arguments are the remote path (or handle), whether symbolic links are followed, and whether the first argument is a handle.

// Demonstrates the SFtp.GetFileSizeStr method, which returns a remote file's size in bytes as a
// decimal string.  The 1st argument is the remote path (or handle), the 2nd selects whether
// symbolic links are followed, and the 3rd indicates whether the 1st argument is a handle.

let sftp = chilkat::SFtp::new();

// Connect, authenticate, and initialize the SFTP subsystem.
let port = 22;
if sftp.connect("sftp.example.com", port).is_err() {
    println!("{}", sftp.last_error_text());
    return;
}

// 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.
let password = "mySshPassword".to_string();

if sftp.authenticate_pw("mySshLogin", &password).is_err() {
    println!("{}", sftp.last_error_text());
    return;
}

if sftp.initialize_sftp().is_err() {
    println!("{}", sftp.last_error_text());
    return;
}

// The 2nd argument (bFollowLinks) selects whether a symbolic link is followed to its target.
// The 3rd argument (bIsHandle) is false here because the 1st argument is a path, not an
// open handle.
let b_follow_links = true;
let b_is_handle = false;

// A string return avoids the 32-bit overflow that GetFileSize32 would have for very large files.
let Ok(file_size) = sftp.get_file_size_str("subdir/hugefile.dat", b_follow_links, b_is_handle) else {
    println!("{}", sftp.last_error_text());
    return;
};

println!("File size: {} bytes", file_size);

sftp.disconnect();