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(PowerShell) 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
[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll") # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. $ws = New-Object Chilkat.WebSocket # 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-Object Chilkat.Rest # Connect to websockets.chilkat.io # (websockets.chilkat.io accepts frames of up to 16K in size and echoes them back) $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 -ne $true) { $($ws.LastErrorText) exit } # This example sends a small JPG file (about 7KB) in a websocket frame. $jpgData = New-Object Chilkat.BinData $success = $jpgData.LoadFile("qa_data/jpg/starfish.jpg") $("Number of bytes to send = " + $jpgData.NumBytes) # 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 -ne $true) { $($ws.LastErrorText) 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 -eq $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 -ne $true) { $("Failed to receive a frame") $("ReadFrame fail reason = " + $ws.ReadFrameFailReason) $($ws.LastErrorText) exit } $receivedFinalFrame = $ws.FinalFrame # Show the opcode and final frame bit for the frame just received: $("Frame opcode: " + $ws.FrameOpcode) $("Final frame: " + $receivedFinalFrame) } # Get the accumulated received data. $jpgReceivedData = New-Object Chilkat.BinData $ws.GetFrameDataBd($jpgReceivedData) $("Received " + $jpgReceivedData.NumBytes + " bytes") # 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 -ne $true) { $($ws.LastErrorText) exit } # Read the Close response. $success = $ws.ReadFrame() if ($success -ne $true) { $("ReadFrame fail reason = " + $ws.ReadFrameFailReason) $($ws.LastErrorText) exit } # Should receive the "Close" opcode. $("Received opcode: " + $ws.FrameOpcode) # Should be the same status code we sent (1000) $("Received close status code: " + $ws.CloseStatusCode) # The server may echo the close reason. If not, this will be empty. $("Echoed close reason: " + $ws.CloseReason) $("Success.") |
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