Rust

Read Text at a String Offset from a Remote SFTP File

Demonstrates the Chilkat SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the maximum number of bytes, and the charset.

Background: The string-offset read exists for the same reason as its write counterpart: it lets code in languages without convenient 64-bit integers still address positions in very large files by supplying the offset as text. Functionally it is identical to the int64 version.

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// Demonstrates the SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte
// offset as a decimal string.  The 1st argument is the handle, the 2nd is the offset string, the
// 3rd is the maximum number of bytes, and the 4th is the charset.

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;
}

let Ok(handle) = sftp.open_file("subdir/hugefile.dat", "readOnly", "openExisting") else {
    println!("{}", sftp.last_error_text());
    return;
};

// Supplying the offset as a string is convenient in languages without a native 64-bit integer.
let offset = "5000000000".to_string();
let num_bytes = 6;
let Ok(text) = sftp.read_file_text64s(&handle, &offset, num_bytes, "utf-8") else {
    println!("{}", sftp.last_error_text());
    return;
};

println!("{}", text);

if sftp.close_handle(&handle).is_err() {
    println!("{}", sftp.last_error_text());
    return;
}

sftp.disconnect();