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(PHP Extension) WebSocket Send/Receive Binary DataDemonstrates how to send and receive binary data on a websocket. This example uses Chilkat's websocket test echo server at ws://websockets.chilkat.io/wsChilkatEcho.ashx
Note: The websockets.chilkat.io server imposes the following limitations:
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $ws = new CkWebSocket(); // For brevity, this example does not check for errors when etablishing the WebSocket connection. // See Establish WebSocket Connection for more complete sample code for making the connection. $rest = new CkRest(); // Connect to websockets.chilkat.io // IMPORTANT: websockets.chilkat.io accepts frames of up to 16K in size and echoes them back. // IMPORTANT: The websockets.chilkat.io server imposes the following limitations: // ---------- Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages. $success = $rest->Connect('websockets.chilkat.io',80,false,false); $ws->UseConnection($rest); $ws->AddClientHeaders(); $responseBodyIgnored = $rest->fullRequestNoBody('GET','/wsChilkatEcho.ashx'); $success = $ws->ValidateServerHandshake(); if ($success != true) { print $ws->lastErrorText() . "\n"; exit; } // This example sends a small JPG file (about 7KB) in a websocket frame. $jpgData = new CkBinData(); $success = $jpgData->LoadFile('qa_data/jpg/starfish.jpg'); print 'Number of bytes to send = ' . $jpgData->get_NumBytes() . "\n"; // Send a frame containing the JPG image data. // This will be the first and final frame, and therefore this constitutes the entire message. $finalFrame = true; $success = $ws->SendFrameBd($jpgData,$finalFrame); if ($success != true) { print $ws->lastErrorText() . "\n"; exit; } // Read the echoed binary frame(s). // (We sent the JPG file in a single frame, but we may receive the echo in multiple frames, but it will be one message.) // Read an incoming frames until we receive the final frame. $receivedFinalFrame = false; while ($receivedFinalFrame == false) { // The ws object is accumulating the received data internally. Once we get the final frame, we'll get the // accumulated data which should constitute the entire JPG. $success = $ws->ReadFrame(); if ($success != true) { print 'Failed to receive a frame' . "\n"; print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n"; print $ws->lastErrorText() . "\n"; exit; } $receivedFinalFrame = $ws->get_FinalFrame(); // Show the opcode and final frame bit for the frame just received: print 'Frame opcode: ' . $ws->frameOpcode() . "\n"; print 'Final frame: ' . $receivedFinalFrame . "\n"; } // Get the accumulated received data. $jpgReceivedData = new CkBinData(); $ws->GetFrameDataBd($jpgReceivedData); print 'Received ' . $jpgReceivedData->get_NumBytes() . ' bytes' . "\n"; // Save the received JPG to a file so we can check it.. $jpgReceivedData->WriteFile('qa_output/starfish_ws.jpg'); // Close the websocket connection. $success = $ws->SendClose(true,1000,'Closing this websocket.'); if ($success != true) { print $ws->lastErrorText() . "\n"; exit; } // Read the Close response. $success = $ws->ReadFrame(); if ($success != true) { print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n"; print $ws->lastErrorText() . "\n"; exit; } // Should receive the "Close" opcode. print 'Received opcode: ' . $ws->frameOpcode() . "\n"; // Should be the same status code we sent (1000) print 'Received close status code: ' . $ws->get_CloseStatusCode() . "\n"; // The server may echo the close reason. If not, this will be empty. print 'Echoed close reason: ' . $ws->closeReason() . "\n"; print 'Success.' . "\n"; ?> |
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