JavaScript

Receive Text up to a Matching Sequence

Demonstrates Socket.ReceiveUntilMatch, which receives bytes until an exact byte sequence is found. The match string is encoded using StringCharset and compared byte-for-byte.

Background. The comparison is case-sensitive with no Unicode normalization. This is useful for reading a message that ends with an application-defined marker delimiting the end of a response.

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.

JavaScript

var success = false;

var socket = new CkSocket();

//  Connect to the server using TLS.  The 3rd argument enables the TLS handshake after the TCP
//  connection succeeds; the 4th is the maximum time to wait, in milliseconds.
var bTls = true;
var maxWaitMs = 5000;
success = socket.Connect("example.com",5000,bTls,maxWaitMs);
if (success == false) {
    console.log(socket.LastErrorText);
    return;
}

//  StringCharset controls the character encoding used when sending and receiving text.
socket.StringCharset = "utf-8";
//  Send a request using a simple application-defined text protocol in which each message ends with a
//  CRLF.
var command = "STATUS\r\n";
success = socket.SendString(command);
if (success == false) {
    console.log(socket.LastErrorText);
    return;
}

//  Receive bytes until an exact byte sequence is found.  The match string is encoded using
//  StringCharset and compared byte-for-byte.  Here the server marks the end of its response with an
//  application-defined marker.
var response = socket.ReceiveUntilMatch("<EOM>");
if (socket.LastMethodSuccess == false) {
    console.log(socket.LastErrorText);
    return;
}

console.log(response);