Node.js

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var sock = new chilkat.Socket();

    //  --------------------------------------------------------------------
    //  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 chilkat.BinData();
    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 chilkat.BinData();
    //  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

}

chilkatExample();