C#

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. C#

bool success = false;

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

Chilkat.Socket sock = new Chilkat.Socket();

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

bool useTls = false;
int port = 4242;
int maxWaitMs = 5000;
success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs);
if (success == false) {
    Debug.WriteLine(sock.LastErrorText);
    return;
}

//  Wait a max of 2 seconds for a response..
sock.MaxReadIdleMs = 2000;

//  Send a 16-bit integer using big-endian byte ordering (also called network byte order)
//  12022 decimal = 2EF6 hex
int value = 12022;
bool bigEndian = true;
sock.SendInt16(value,bigEndian);
//  Send it again, because we'll read it two different ways..
sock.SendInt16(value,bigEndian);

//  The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
sock.SendByte(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.)
string hexStr = sock.ReceiveNBytesENC(2,"hex");

//  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.
Debug.WriteLine("Expecting big-endian 2EF6");
Debug.WriteLine(hexStr);

//  Let's read directly to an integer..
success = sock.ReceiveInt16(bigEndian,true);
Debug.WriteLine("Expecting 12022");
Debug.WriteLine("Received: " + Convert.ToString(sock.ReceivedInt));

//  Consume the LF that gets echoed back..
sock.ReceiveByte(true);

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

Debug.WriteLine("----");

//  12022 decimal = 2EF6 hex, but little-endian byte ordering will send the bytes in the order 0xF6 0x2E
value = 12022;
bigEndian = false;
sock.SendInt16(value,bigEndian);
sock.SendInt16(value,bigEndian);
sock.SendByte(10);

hexStr = sock.ReceiveNBytesENC(2,"hex");

Debug.WriteLine("Expecting little-endian F62E");
Debug.WriteLine(hexStr);

success = sock.ReceiveInt16(bigEndian,true);
Debug.WriteLine("Expecting 12022");
Debug.WriteLine("Received: " + Convert.ToString(sock.ReceivedInt));

//  Consume the LF that gets echoed back..
sock.ReceiveByte(true);

sock.Close(1000);

//  Output:

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