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
integer li_Success
oleobject loo_Rest
oleobject loo_Ws
string ls_ResponseBody
integer li_StatusCode
integer 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