(Classic ASP) WebSocket Send/Receive Binary Data

Demonstrates 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:
Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<%
' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.WebSocket")
set ws = Server.CreateObject("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.

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rest")
set rest = Server.CreateObject("Chilkat.Rest")
' 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",80,0,0)
success = ws.UseConnection(rest)
success = ws.AddClientHeaders()
responseBodyIgnored = rest.FullRequestNoBody("GET","/wsChilkatEcho.ashx")
success = ws.ValidateServerHandshake()
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.End
End If

' This example sends a small JPG file (about 7KB) in a websocket frame.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
set jpgData = Server.CreateObject("Chilkat.BinData")
success = jpgData.LoadFile("qa_data/jpg/starfish.jpg")

Response.Write "<pre>" & Server.HTMLEncode( "Number of bytes to send = " & jpgData.NumBytes) & "</pre>"

' Send a frame containing the JPG image data.
' This will be the first and final frame, and therefore this constitutes the entire message.
finalFrame = 1
success = ws.SendFrameBd(jpgData,finalFrame)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.End
End If

' 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 = 0
Do While receivedFinalFrame = 0

    ' 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 <> 1) Then
        Response.Write "<pre>" & Server.HTMLEncode( "Failed to receive a frame") & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( "ReadFrame fail reason = " & ws.ReadFrameFailReason) & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
        Response.End
    End If

    receivedFinalFrame = ws.FinalFrame

    ' Show the opcode and final frame bit for the frame just received:
    Response.Write "<pre>" & Server.HTMLEncode( "Frame opcode: " & ws.FrameOpcode) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "Final frame: " & receivedFinalFrame) & "</pre>"
Loop

' Get the accumulated received data.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
set jpgReceivedData = Server.CreateObject("Chilkat.BinData")
success = ws.GetFrameDataBd(jpgReceivedData)
Response.Write "<pre>" & Server.HTMLEncode( "Received " & jpgReceivedData.NumBytes & " bytes") & "</pre>"

' Save the received JPG to a file so we can check it..
success = jpgReceivedData.WriteFile("qa_output/starfish_ws.jpg")

' Close the websocket connection.
success = ws.SendClose(1,1000,"Closing this websocket.")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.End
End If

' Read the Close response.
success = ws.ReadFrame()
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "ReadFrame fail reason = " & ws.ReadFrameFailReason) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.End
End If

' Should receive the "Close" opcode.
Response.Write "<pre>" & Server.HTMLEncode( "Received opcode: " & ws.FrameOpcode) & "</pre>"
' Should be the same status code we sent (1000)
Response.Write "<pre>" & Server.HTMLEncode( "Received close status code: " & ws.CloseStatusCode) & "</pre>"
' The server may echo the close reason.  If not, this will be empty.
Response.Write "<pre>" & Server.HTMLEncode( "Echoed close reason: " & ws.CloseReason) & "</pre>"

Response.Write "<pre>" & Server.HTMLEncode( "Success.") & "</pre>"

%>
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