Rust

Write Text at a String Offset in a Remote SFTP File

Demonstrates the Chilkat SFtp.WriteFileText64s method, which is like WriteFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the charset, and the text.

Background: Some programming languages Chilkat targets lack a native 64-bit integer type, or make large integer literals awkward. Passing the offset as a decimal string sidesteps that entirely — the value is parsed by the library — while addressing the same large-file positions as the int64 form.

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Rust


// Demonstrates the SFtp.WriteFileText64s method, which is like WriteFileText64 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 charset, and the 4th is the text.

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", "readWrite", "openOrCreate") 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();
if sftp.write_file_text64s(&handle, &offset, "utf-8", "MARKER").is_err() {
    println!("{}", sftp.last_error_text());
    return;
}

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

println!("Wrote at the string offset.");

sftp.disconnect();