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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Perl

use chilkat();

$success = 0;

$socket = chilkat::CkSocket->new();

#  Connect to the server using TLS.
$bTls = 1;
$maxWaitMs = 5000;
$success = $socket->Connect("example.com",5000,$bTls,$maxWaitMs);
if ($success == 0) {
    print $socket->lastErrorText() . "\r\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.
$bBigEndian = 1;
$bUnsigned = 0;
$success = $socket->ReceiveInt16($bBigEndian,$bUnsigned);
if ($success == 0) {
    print $socket->lastErrorText() . "\r\n";
    exit;
}

print "Received 16-bit integer: " . $socket->get_ReceivedInt() . "\r\n";