Send a 4-byte Length Prefix over a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.SendCount, which sends a four-byte length prefix in network byte order. This is typically used to tell the peer how many bytes follow.

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;
}

# Send a four-byte length prefix in network byte order.  A common framing pattern is to send the
# number of bytes in a message before the message itself, so the peer knows exactly how many bytes
# to read.
my $messageLength = 512;
$success = $socket->SendCount($messageLength);
if (!$success) {
    print $socket->LastErrorText, "\n";
    exit;
}

print "Length prefix sent.\n";