Xojo Plugin

Duplicate Python websockets

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Demonstrates how to duplicate the following Python client-side websocket snippet:

async with websockets.connect('ws://192.168.1.35/websocket') as websocket:
await websocket.send("http.controller_login:username=xxx&password=xxxxx")
response = await websocket.recv()

Xojo Plugin

Dim success As Boolean
success = False

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// In Python, the following line of code does more than just connect:
// 
//      websockets.connect('ws://192.168.1.35/websocket')
// 
// It is connecting to 192.168.1.35 without using TLS.  If the URI starts with "wss://", then TLS should be used.
// But this URI begins with just "ws:/", so no TLS.

// Also, after connecting, a GET request is sent to the /websocket endpoint.
// In summary, the websockets.connect function is establishing the connection and it sends a GET request.

// First establish the connection.
// No TLS, use the default HTTP port 80.
Dim rest As New Chilkat.Rest
success = rest.Connect("192.168.1.35",80,False,False)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

Dim ws As New Chilkat.WebSocket

// Tell the WebSocket to use this connection.
success = ws.UseConnection(rest)
If (success <> True) Then
    System.DebugLog(ws.LastErrorText)
    Return
End If

// Add the standard WebSocket open handshake headers that will be needed.
// (This adds the required HTTP request headers to the rest object.)
success = ws.AddClientHeaders()

// Now send the GET request to /websockets.
Dim responseBody As String
responseBody = rest.FullRequestNoBody("GET","/websockets")
If (rest.LastMethodSuccess <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

// If successful, the HTTP response status code should be 101,
// and the response body will be empty. (If it failed, we'll have a look
// at the response body..)
Dim statusCode As Int32
statusCode = rest.ResponseStatusCode
System.DebugLog("Response status code: " + Str(statusCode))

If (statusCode <> 101) Then
    System.DebugLog(responseBody)
    System.DebugLog("-- Failed because of unexpected response status code.")
    Return
End If

// We have the expected 101 response, so let's now validate the 
// contents of the response.
success = ws.ValidateServerHandshake()
If (success <> True) Then
    System.DebugLog(ws.LastErrorText)
    Return
End If

System.DebugLog("WebSocket connection successful.")

// The application may now begin sending and receiving frames on the WebSocket connection.

// The 1st frame sent by the Python snippet is:
// 
//     websocket.send("http.controller_login:username=xxx&password=xxxxx")
// 

// Send the same using Chilkat, and get the response.
Dim finalFrame As Boolean
finalFrame = True
success = ws.SendFrame("http.controller_login:username=xxx&password=xxxxx",finalFrame)
If (success <> True) Then
    System.DebugLog(ws.LastErrorText)
    Return
End If

// Read an incoming frame.
success = ws.ReadFrame()
If (success <> True) Then
    System.DebugLog("Failed to receive a frame")
    System.DebugLog("ReadFrame fail reason = " + Str(ws.ReadFrameFailReason))
    System.DebugLog(ws.LastErrorText)
    Return
End If

// Show the string that was received.
Dim receivedStr As String
receivedStr = ws.GetFrameData()
System.DebugLog("Received: " + receivedStr)

// Continue with whatever additional communications are desired...
// ....
//