Rust

Socket Send/Receive 16-bit Integers

Demonstrates sending and receiving 16-bit integers over a socket connection using either big-endian or little-endian byte ordering. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

let sock = chilkat::Socket::new();

// --------------------------------------------------------------------
// This example uses the public TCP echo service at https://tcpbin.com/
// --------------------------------------------------------------------

let use_tls = false;
let port = 4242;
let max_wait_ms = 5000;
if sock.connect("tcpbin.com", port, use_tls, max_wait_ms).is_err() {
    println!("{}", sock.last_error_text());
    return;
}

// Wait a max of 2 seconds for a response..
sock.set_max_read_idle_ms(2000);

// Send a 16-bit integer using big-endian byte ordering (also called network byte order)
// 12022 decimal = 2EF6 hex
let mut value = 12022;
let mut big_endian = true;
let _ = sock.send_int16(value, big_endian);
// Send it again, because we'll read it two different ways..
let _ = sock.send_int16(value, big_endian);

// The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
let _ = sock.send_byte(10);

// Let's see hex values of the 2 bytes sent in network byte order (big-endian)
// (The echo server sends back exactly the bytes received.)
let mut hex_str = sock.receive_n_bytes_enc(2, "hex").unwrap_or_default();

// In the big-ending byte order, the byte order is most significant byte to least significant,
// therefore we should see the bytes in the order 0x2E 0xF6.
println!("Expecting big-endian 2EF6");
println!("{}", hex_str);

// Let's read directly to an integer..
let _ = sock.receive_int16(big_endian, true).is_ok();
println!("Expecting 12022");
println!("Received: {}", sock.received_int());

// Consume the LF that gets echoed back..
let _ = sock.receive_byte(true);

// --------------------------------------------------------------------
// Let's do the same thing, but with little-endian byte ordering.

println!("----");

// 12022 decimal = 2EF6 hex, but little-endian byte ordering will send the bytes in the order 0xF6 0x2E
value = 12022;
big_endian = false;
let _ = sock.send_int16(value, big_endian);
let _ = sock.send_int16(value, big_endian);
let _ = sock.send_byte(10);

hex_str = sock.receive_n_bytes_enc(2, "hex").unwrap_or_default();

println!("Expecting little-endian F62E");
println!("{}", hex_str);

let _ = sock.receive_int16(big_endian, true).is_ok();
println!("Expecting 12022");
println!("Received: {}", sock.received_int());

// Consume the LF that gets echoed back..
let _ = sock.receive_byte(true);

let _ = sock.close(1000);

// Output:

// Expecting big-endian 2EF6
// 2EF6
// Expecting 12022
// Received: 12022
// ----
// Expecting little-endian F62E
// F62E
// Expecting 12022
// Received: 12022