Help with Invoke on CF

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Help with Invoke on CF

I have been trying to nail this problem for a week now, but can't seem to get it right. I am building a Jabber application for the PocketPC and am using a third-party component for n-software. The n-software component does the usual things: expose a connect method, but also an OnSync event that fires when the device has logged into the Jabber server successfully. The OnSync THEN downloads the Jabber Roster (ala MyBuddies). Once I have these buddies, I want to parse them and put them, by group, into a TreeView. The issue is the old threading problem. I can't get the TreeView to load the Roster. ANy help would be appreciated... THANKS.

My code is as follows:

Delegate Sub MyEventHandler(ByVal sender As Object, ByVal e As nsoftware.IPWorks.XmppSyncEventArgs)

Private MyXmppSync As MyEventHandler

In the Private Sub Form1.Load I have:

MyXmppSync = New MyEventHandler(AddressOf Me.UpdateTVW)

-------------------------------------------------------------------------------------------------------------------

Private Sub Xmpp1_OnSync(ByVal sender As Object, ByVal e As nsoftware.IPWorks.XmppSyncEventArgs) Handles Xmpp1.OnSync

Invoke(MyXmppSync, New Object() {sender, e})

'Dim tvwsync As New EventHandler(AddressOf UpdateTVW)

'Me.BeginInvoke(tvwsync)

End Sub

-------------------------------------------------------------------------------------------------------------------

Private Sub UpdateTVW(ByVal sender As Object, ByVal e As nsoftware.IPWorks.XmppSyncEventArgs)

tvwRoster.Nodes.Clear()

Dim i As Integer

For i = 1 To Xmpp1.BuddyCount

Try

If Xmpp1.BuddyGroup(i) <> "" Then

BuddyGroups.Add(Xmpp1.BuddyGroup(i), Xmpp1.BuddyGroup(i))

Else

BuddyGroups.Add("Other", Xmpp1.BuddyGroup(i))

End If

Catch

End Try

Next

'Next, add all the groups and buddies to the tvwRoster:

Dim group As DictionaryEntry

For Each group In BuddyGroups

'create group node:

Dim groupNode As TreeNode

Dim GroupName As String = group.Value

groupNode = tvwRoster.Nodes.Add(GroupName)

groupNode.ImageIndex = 3

'add buddies to the group

For i = 1 To Xmpp1.BuddyCount

If Xmpp1.BuddyGroup(i).Equals(group.Value) Then

Dim id As String = Xmpp1.BuddyId(i)

id = id.Split("@")(0)

Dim newnode As TreeNode = New TreeNode(id)

newnode.Tag = id

newnode.ImageIndex = 3

groupNode.Nodes.Add(newnode)

groupNode.ImageIndex = 3

'Dim newnode As TreeNode = New TreeNode(Xmpp1.BuddyId(i))

'groupNode.Nodes.Add(newnode)

End If

Next

Next

End Sub


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Help with Invoke on CF

  • WRBehning

    Is this Compact Framework 1 or 2 In 1 you could only Invoke handlers that used EventHandler signature (object, EventArguments), so we had to pass any parameters via member variable.

    What exactly is the error you are getting My guess it's NotSupportedException



  • WoFe

    If you set a breakpoint at the beginning of UpdateTVW, do you hit it Can you single-step from there

  • mary.oneill

    Have you verified you hit this line assigning MyXmppSync in your OnLoad method (prior the the BP described above) What does the debugger tell you the value of MyXmppSync is after stepping over that line

    In the Private Sub Form1.Load I have:

    MyXmppSync = New MyEventHandler(AddressOf Me.UpdateTVW)



  • stephane - Montpellier

    Negative. It is locking up on the Invoke call when the XMPP component fires the OnSync event (which is not on the UI thread):

    Private Sub Xmpp1_OnSync(ByVal sender As Object, ByVal e As nsoftware.IPWorks.XmppSyncEventArgs) Handles Xmpp1.OnSync

    Invoke(MyXmppSync, New Object() {sender, e})

    End Sub

    As well, when I hover over specific variables, MyXmppSync comes up as "nothing" while "sender" and "e" have what I would expect. Many thanks. This one has me vexed.



  • Scott Simms

    Sorry, I am using .NET CF 2.0. The app is locking up on the Dell Axim I am testing with. The code that I listed is the current build that didn't exhibit errors in the VS.NET environment. It deploys, but never runs.

  • Help with Invoke on CF
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