Perl

Receive a Single Byte from a Socket

Demonstrates Socket.ReceiveByte, which reads exactly one byte and stores its numeric value in the ReceivedInt property. The argument selects signed or unsigned interpretation.

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 one byte.  Its numeric value is stored in the ReceivedInt property.  Passing 1
# interprets the byte as unsigned (0 through 255); 0 interprets it as signed.
my $bUnsigned = 1;
$success = $socket->ReceiveByte($bUnsigned);
if (!$success) {
    print $socket->LastErrorText, "\n";
    exit;
}

print 'Received byte value: ', $socket->ReceivedInt, "\n";