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02.10.2005 at 08:52PM PST, ID: 21310731
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8.6

Delegate Problem

Asked by jazduck in Microsoft Visual Basic.Net

Tags:

Consider the following code.

Class TcpServer contains the following declarations at class level:

Private Delegate Sub dlgReceiveData(ByVal clientdata As String)
Dim frm1 As Form1 'The instance of Form1 is created in Sub New

It then has a Sub that receives data over sockets, in that sub the delegate code to pass the receivedData back to my Form's class looks like:

Sub TcpServer()
    'Sets up and receives data from a client then
     Dim dlg As New dlgReceiveData(AddressOf frm1.ReceivedData)
     dlg.Invoke(clientData) 'Pass clientdata to ReceivedData
End Sub

Sub ReceivedData(ByVal receivedData As String)
     MsgBox(receivedData) 'Displayed the receivedData
     Label1.Text = receivedData 'Doesnt display receivedData on the Form, but the Text property reflects the receivedData
End Sub

So the problem is that the Label wont display on the form, the msgbox will.  The only reason i can see for this, is im creating/working on a different instance of the form than the one being displayed.  However when i tried passing the original instance as a parameter to the delegate, it still didnt work.

Any thoughts?
JazStart Free Trial
 
Keywords: Delegate Problem
Title
1 Delegate Threading
2 Explain Delegates
3 AddressOf -> equivalent in c#
4 delegates
5 addressof question
6 Delegates
 
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[+][-]02.10.2005 at 11:44PM PST, ID: 13283691

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[+][-]02.11.2005 at 12:21AM PST, ID: 13283809

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[+][-]02.11.2005 at 03:13AM PST, ID: 13284400

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[+][-]02.11.2005 at 04:46AM PST, ID: 13285102

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[+][-]02.13.2005 at 05:50PM PST, ID: 13300768

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[+][-]02.13.2005 at 06:10PM PST, ID: 13300843

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[+][-]02.14.2005 at 09:28AM PST, ID: 13306216

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About this solution

Zone: Microsoft Visual Basic.Net
Tags: delegate
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Solution Provided By: AlexFM
Participating Experts: 2
Solution Grade: A
 
 
[+][-]02.14.2005 at 08:19PM PST, ID: 13310784

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