(JavaScript) Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte method.

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 some strings, each terminated by a 0 byte.
sock.SendString("This is the 1st string");
sock.SendByte(0);
sock.SendString("This is string number 2");
sock.SendByte(0);

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

// Now let's receive what is echoed back....
// Receive each string and the NULL byte.
// The call to ReceiveStringUntilByte will receive incoming data until the lookForByte is encountered.
// The lookForByte is receive and discarded (it is not returned in the string)
var lookForByte = 0;
var s1 = sock.ReceiveStringUntilByte(lookForByte);
if (sock.LastMethodSuccess == false) {
    console.log(sock.LastErrorText);
    return;
}

console.log(s1);

var s2 = sock.ReceiveStringUntilByte(lookForByte);
if (sock.LastMethodSuccess == false) {
    console.log(sock.LastErrorText);
    return;
}

console.log(s2);

// The echo server will also echo back the final LF
sock.ReceiveByte(true);
maxWaitMs = 100;
sock.Close(100);

// Output:
// This is the 1st string
// This is string number 2