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(PHP Extension) Socket Send/Receive 16-bit IntegersDemonstrates sending and receiving 16-bit integers over a socket connection using either big-endian or little-endian byte ordering.
<?php include("chilkat.php"); // Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0 // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $sock = new CkSocket(); // -------------------------------------------------------------------- // This example uses the public TCP echo service at https://tcpbin.com/ // -------------------------------------------------------------------- $useTls = false; $port = 4242; $maxWaitMs = 5000; $success = $sock->Connect('tcpbin.com',$port,$useTls,$maxWaitMs); if ($success == false) { print $sock->lastErrorText() . "\n"; exit; } // Wait a max of 2 seconds for a response.. $sock->put_MaxReadIdleMs(2000); // Send a 16-bit integer using big-endian byte ordering (also called network byte order) // 12022 decimal = 2EF6 hex $value = 12022; $bigEndian = true; $sock->SendInt16($value,$bigEndian); // Send it again, because we'll read it two different ways.. $sock->SendInt16($value,$bigEndian); // The tcpbin.com echo server only echoes after receiving an LF (linefeed char) $sock->SendByte(10); // Let's see hex values of the 2 bytes sent in network byte order (big-endian) // (The echo server sends back exactly the bytes received.) $hexStr = $sock->receiveNBytesENC(2,'hex'); // In the big-ending byte order, the byte order is most significant byte to least significant, // therefore we should see the bytes in the order 0x2E 0xF6. print 'Expecting big-endian 2EF6' . "\n"; print $hexStr . "\n"; // Let's read directly to an integer.. $success = $sock->ReceiveInt16($bigEndian,true); print 'Expecting 12022' . "\n"; print 'Received: ' . $sock->get_ReceivedInt() . "\n"; // Consume the LF that gets echoed back.. $sock->ReceiveByte(true); // -------------------------------------------------------------------- // Let's do the same thing, but with little-endian byte ordering. print '----' . "\n"; // 12022 decimal = 2EF6 hex, but little-endian byte ordering will send the bytes in the order 0xF6 0x2E $value = 12022; $bigEndian = false; $sock->SendInt16($value,$bigEndian); $sock->SendInt16($value,$bigEndian); $sock->SendByte(10); $hexStr = $sock->receiveNBytesENC(2,'hex'); print 'Expecting little-endian F62E' . "\n"; print $hexStr . "\n"; $success = $sock->ReceiveInt16($bigEndian,true); print 'Expecting 12022' . "\n"; print 'Received: ' . $sock->get_ReceivedInt() . "\n"; // Consume the LF that gets echoed back.. $sock->ReceiveByte(true); $sock->Close(1000); // Output: // Expecting big-endian 2EF6 // 2EF6 // Expecting 12022 // Received: 12022 // ---- // Expecting little-endian F62E // F62E // Expecting 12022 // Received: 12022 ?> |
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