Visual FoxPro

Duplicate Python websockets

See more WebSocket Examples

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()

Visual FoxPro

LOCAL lnSuccess
LOCAL loRest
LOCAL loWs
LOCAL lcResponseBody
LOCAL lnStatusCode
LOCAL lnFinalFrame
LOCAL lcReceivedStr

lnSuccess = 0

*  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.
loRest = CreateObject('Chilkat.Rest')
lnSuccess = loRest.Connect("192.168.1.35",80,0,0)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

loWs = CreateObject('Chilkat.WebSocket')

*  Tell the WebSocket to use this connection.
lnSuccess = loWs.UseConnection(loRest)
IF (lnSuccess <> 1) THEN
    ? loWs.LastErrorText
    RELEASE loRest
    RELEASE loWs
    CANCEL
ENDIF

*  Add the standard WebSocket open handshake headers that will be needed.
*  (This adds the required HTTP request headers to the rest object.)
loWs.AddClientHeaders()

*  Now send the GET request to /websockets.
lcResponseBody = loRest.FullRequestNoBody("GET","/websockets")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loWs
    CANCEL
ENDIF

*  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..)
lnStatusCode = loRest.ResponseStatusCode
? "Response status code: " + STR(lnStatusCode)

IF (lnStatusCode <> 101) THEN
    ? lcResponseBody
    ? "-- Failed because of unexpected response status code."
    RELEASE loRest
    RELEASE loWs
    CANCEL
ENDIF

*  We have the expected 101 response, so let's now validate the 
*  contents of the response.
lnSuccess = loWs.ValidateServerHandshake()
IF (lnSuccess <> 1) THEN
    ? loWs.LastErrorText
    RELEASE loRest
    RELEASE loWs
    CANCEL
ENDIF

? "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.
lnFinalFrame = 1
lnSuccess = loWs.SendFrame("http.controller_login:username=xxx&password=xxxxx",lnFinalFrame)
IF (lnSuccess <> 1) THEN
    ? loWs.LastErrorText
    RELEASE loRest
    RELEASE loWs
    CANCEL
ENDIF

*  Read an incoming frame.
lnSuccess = loWs.ReadFrame()
IF (lnSuccess <> 1) THEN
    ? "Failed to receive a frame"
    ? "ReadFrame fail reason = " + STR(loWs.ReadFrameFailReason)
    ? loWs.LastErrorText
    RELEASE loRest
    RELEASE loWs
    CANCEL
ENDIF

*  Show the string that was received.
lcReceivedStr = loWs.GetFrameData()
? "Received: " + lcReceivedStr

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

RELEASE loRest
RELEASE loWs