Perl

Receive a 16-bit Integer from a Socket

Demonstrates Socket.ReceiveInt16, which reads exactly two bytes as a 16-bit integer and stores the result in the ReceivedInt property. Byte order and signedness are selectable.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

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use strict;
use warnings;
use Chilkat2;

my $socket = Chilkat2::Socket->new;

# Connect to the server using TLS.
my $bTls = 1;
my $maxWaitMs = 5000;
my $success = $socket->Connect('example.com', 5000, $bTls, $maxWaitMs);
if (!$success) {
    print $socket->LastErrorText, "\n";
    exit;
}

# Read exactly two bytes as a 16-bit integer and store the result in the ReceivedInt property.
# The 1st argument selects byte order (1 = big-endian); the 2nd selects unsigned interpretation.
my $bBigEndian = 1;
my $bUnsigned = 0;
$success = $socket->ReceiveInt16($bBigEndian, $bUnsigned);
if (!$success) {
    print $socket->LastErrorText, "\n";
    exit;
}

print 'Received 16-bit integer: ', $socket->ReceivedInt, "\n";