PowerBuilder

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()

PowerBuilder

integer li_rc
long li_Success
oleobject loo_Rest
oleobject loo_Ws
string ls_ResponseBody
long li_StatusCode
long li_FinalFrame
string ls_ReceivedStr

li_Success = 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.
loo_Rest = create oleobject
li_rc = loo_Rest.ConnectToNewObject("Chilkat.Rest")
if li_rc < 0 then
    destroy loo_Rest
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_Rest.Connect("192.168.1.35",80,0,0)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    return
end if

loo_Ws = create oleobject
li_rc = loo_Ws.ConnectToNewObject("Chilkat.WebSocket")

//  Tell the WebSocket to use this connection.
li_Success = loo_Ws.UseConnection(loo_Rest)
if li_Success <> 1 then
    Write-Debug loo_Ws.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    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.)
loo_Ws.AddClientHeaders()

//  Now send the GET request to /websockets.
ls_ResponseBody = loo_Rest.FullRequestNoBody("GET","/websockets")
if loo_Rest.LastMethodSuccess <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    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..)
li_StatusCode = loo_Rest.ResponseStatusCode
Write-Debug "Response status code: " + string(li_StatusCode)

if li_StatusCode <> 101 then
    Write-Debug ls_ResponseBody
    Write-Debug "-- Failed because of unexpected response status code."
    destroy loo_Rest
    destroy loo_Ws
    return
end if

//  We have the expected 101 response, so let's now validate the 
//  contents of the response.
li_Success = loo_Ws.ValidateServerHandshake()
if li_Success <> 1 then
    Write-Debug loo_Ws.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    return
end if

Write-Debug "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.
li_FinalFrame = 1
li_Success = loo_Ws.SendFrame("http.controller_login:username=xxx&password=xxxxx",li_FinalFrame)
if li_Success <> 1 then
    Write-Debug loo_Ws.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    return
end if

//  Read an incoming frame.
li_Success = loo_Ws.ReadFrame()
if li_Success <> 1 then
    Write-Debug "Failed to receive a frame"
    Write-Debug "ReadFrame fail reason = " + string(loo_Ws.ReadFrameFailReason)
    Write-Debug loo_Ws.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    return
end if

//  Show the string that was received.
ls_ReceivedStr = loo_Ws.GetFrameData()
Write-Debug "Received: " + ls_ReceivedStr

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


destroy loo_Rest
destroy loo_Ws