Control could not be created because there is currently no Session. Create a Web Session Context object

Targets Web
1

How i create a new Web session contex in 2023r1.1?

2

See
https://documentation.xojo.com/api/web/websessioncontext.html#websessioncontext

When you run code in a timer, you may need to tell Xojo which session this belongs to.

3

i have already look at this documentation but i can’t find a solution.Can you help me with another way?

4

Could you tell us where it happens?

you may need to use something like this in the event:

Var context As New WebSessionContext(mySession)

where mySession is a session object or identifier, which you stored somewhere beforehand.

5

Usually the place I see things like this are:

  • App.HandleURL event
  • Timer.Action event (not WebTimer)
  • Socket events (like URLConnection, TCPSocket, UDPSocket)
  • SerialPort events

In all of those cases, the events run on the main thread, completely disconnected from any of the currently running sessions. WebTimer is a good example of a class that was created to deal with this.

Anyway, except for the App class, you can subclass any of the others like this:

  1. Subclass TCPSocket
  2. Add a private property mSession as String
  3. In the Constructor, mSession = Session.Identifier
  4. In the event where you need session access before any other code: dim context as new WebSessionContext(mSession)

You should still check to see if context is Nil in case the session ended while your code was running.

6

// Parse the query string from the URL
Dim query As String = Request.QueryString

// Process the query string parameters
Dim params() As String = query.Split(“&”)
For Each param As String In params
Dim keyValue() As String = param.Split(“=”)
If keyValue.Ubound = 1 Then
Dim key As String = DecodeURLComponent(keyValue(0))
Dim value As String = DecodeURLComponent(keyValue(1))

// Use the key-value pair as needed
// For example, print them to the debug pane
System.DebugLog(key + " = " + value)
if key = "shopcode" then
  Var w as new wpDashboard
  w.setWind(value)
End If

End If
Next
When i try to open the new url.i get the error that i have to create a new web session contex

7

Right, and you’re doing this in App.HandleURL (which I can tell because your first line calls Request.QueryString). The problem is that HandleURL doesn’t consider sessions.

So if this is a link that comes from somewhere else that you want to send someone into a session, what you need is a redirect. You could do something like this:

Var url as string

url = if(request.secure, "https://", "http://") + request.header("host") + "?shopcode=" + value

Response.Header("Location") = url
Response.Status = 302
Return True

Then in Session.Opening, you’ll need to look for the shopcode parameter and redirect the user from there.

Var shopcode As String = session.URLParameter("shopcode")

8

can you give more specific details?
cause i am new to xojo

9

I’m not sure how to be more specific.

It would be helpful to know what the incoming URLs look like though, because you’re going to need to have a way to allow browsers to request a new session.