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9.2

Thread Safe vs General Component (Part 3)

Asked by cdebel in Microsoft Visual Basic.Net

Tags: VB.NET

I'm developping components that inherit TCPClient & TCPListener. I want to build the component to have generate some events like OnConnected, OnDisconnected, OnReceiveData. I want to have some methods like Init, SendMessage, etc.

My TCPServer (inheriting TCPListener) have 2 threads:
- Listening() to accept new connections.
- ProcessMsg() to send anything in OutputBuffer, receive anything in the InputBuffer (it raise an event OnReceiveData(InputBuffer))

In my main application, the event OnReceiveData call ReceiveData method. This method just append the text received to a richtext edit. It trig an error: "Cross-Thread operation not valid: Control 'edtReceive' accessed from a thread other than the thread it was created on."

I know i could solve this by creating a Delegate in my main application like what i wrote below, but i want to keep the wrtting in my main application as simple as possible... like this, without any delegate stuff.

Private Sub TCPServer_OnReceiveData(ByVal Buff() As System.Byte) Handles TCPServer.OnReceiveData
edtReceive.Text = edtReceive.Text + Encoding.ASCII.GetString(Buff)
End Sub

What can i do to solve this problem? Keep in mind that TCPServer is a general component and any application who use it should not have to "do the dance of delegate"...

Thanks for the tips.

Get your answer NOW

         
           
           
             Delegate Sub SetReceiveCallback(ByVal [sMsg] As String)
    Private Sub SetReceive(ByVal [sMsg] As String)
        If Me.edtReceive.InvokeRequired Then
            Dim d As New SetReceiveCallback(AddressOf SetReceive)
            Me.Invoke(d, New Object() {[sMsg]})
        Else
            edtReceive.Text += [sMsg]
        End If
    End Sub

           
         

20091111-EE-VQP-89 / EE_QW_2_20070628

Thread Safe vs General Component (Part 3)

Asked by cdebel in Microsoft Visual Basic.Net

Tags: VB.NET

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