(JavaScript) Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

var sock = new CkSocket();

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

var useTls = false;
var port = 4242;
var maxWaitMs = 5000;
success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs);
if (success == false) {
    console.log(sock.LastErrorText);
    return;
}

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

// Send 26 bytes contained in a Chilkat BinData
var bdToSend = new CkBinData();
var i = 0;
var byteVal = 65;
while (i < 26) {
    bdToSend.AppendByte(byteVal);
    byteVal = byteVal+1;
    i = i+1;
}

// Send the contents of the BinData
// Pass zero's in the 2nd and 3rd arguments to send the entire contents of the BinData.
sock.SendBd(bdToSend,0,0);

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

// The echo server will echo back whatever is sent to it.
// We should be able to read the same bytes back..
var bdRecv = new CkBinData();
// Receive the 26 bytes previously sent, plus the LF char.
success = sock.ReceiveBdN(27,bdRecv);
if (success == false) {
    console.log(sock.LastErrorText);
    return;
}

// Show the contents of bdRecv in hex format
console.log(bdRecv.GetEncoded("hex"));

// Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A