Help with raising an event form class

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Hi,
I followed the the aricle
http://support.microsoft.com/default.aspx?scid=kb;en-us;321525 and was able
to execute a dts package
in vb.net. I replaced all the "Console.WriteLine" with "msgbox". The problem
I am having is that on my form I added a listbox control
and I created a sub that added entries to the list box

Public Sub addListItems(ByVal sItem As String)

ListBox1.Items.Add(sItem)

End Sub

Then I replaced all the "msgbox" with addListItems(<message>). But form the
PackageEventsSink class how do I execute the addListItems
on form1 to add the entries to the listbox. What I tried was creating an
event in the PackageEventsSink class

Public Event Message(ByVal sMessage As String)

and I tried to raise it like

Overridable Overloads Sub OnError(ByVal EventSource As String, _
ByVal ErrorCode As Integer, ByVal Source As String, _
ByVal Description As String, ByVal HelpFile As String, _
ByVal HelpContext As Integer, ByVal IDofInterfaceWithError As
String, _
ByRef pbCancel As Boolean) Implements DTS.PackageEvents.OnError

RaiseEvent Message("Error")

'MsgBox("Error")
End Sub

and form form1 I did the foll

declared Dim WithEvents PES As PackageEventsSink = New PackageEventsSink

and add


Private Sub PES_Message(ByVal sMessage As String) Handles PES.Message

ListBox1.Items.Add(sMessage)
Application.DoEvents()

End Sub

But when I run the program I get all the message boxes but then the program
hangs on the event. I get no error message. It just hangs.

This is the code




-------------class

Public Class PackageEventsSink
Implements DTS.PackageEvents

Public Event Message(ByVal sMessage As String)

Overridable Overloads Sub OnError(ByVal EventSource As String, _
ByVal ErrorCode As Integer, ByVal Source As String, _
ByVal Description As String, ByVal HelpFile As String, _
ByVal HelpContext As Integer, ByVal IDofInterfaceWithError As
String, _
ByRef pbCancel As Boolean) Implements DTS.PackageEvents.OnError

RaiseEvent Message("Error") <--------------here I believe is error.

'MsgBox("Error")
End Sub
Overridable Overloads Sub OnFinish(ByVal EventSource As String) _
Implements DTS.PackageEvents.OnFinish
MsgBox("On Finished")
End Sub
Overridable Overloads Sub OnProgress(ByVal EventSource As String, _
ByVal ProgressDescription As String, ByVal PercentComplete As
Integer, _
ByVal ProgressCountLow As Integer, ByVal ProgressCountHigh As
Integer) _
Implements DTS.PackageEvents.OnProgress

MsgBox("On Progress")
End Sub
Overridable Overloads Sub OnQueryCancel(ByVal EventSource As String, _
ByRef pbCancel As Boolean) Implements
DTS.PackageEvents.OnQueryCancel
If EventSource.Length > 0 Then
MsgBox("Query Cancel Yes")
Else
MsgBox("Query Cancel No")
End If
pbCancel = False
End Sub
Overridable Overloads Sub OnStart(ByVal EventSource As String) _
Implements DTS.PackageEvents.OnStart
MsgBox("On Start")
End Sub


End Class


--------------form 1



Dim WithEvents PES As PackageEventsSink = New PackageEventsSink


Dim pkg As DTS.Package
Try
pkg = New DTS.Package
'Begin - set up events sink
Dim cpContainer As UCOMIConnectionPointContainer
cpContainer = CType(pkg, UCOMIConnectionPointContainer)
Dim cpPoint As UCOMIConnectionPoint
'Dim PES As PackageEventsSink = New PackageEventsSink
Dim guid As Guid = _
New Guid("10020605-EB1C-11CF-AE6E-00AA004A34D5")
cpContainer.FindConnectionPoint(guid, cpPoint)
Dim intCookie As Integer
cpPoint.Advise(PES, intCookie)
'End - set up events sink
pkg.LoadFromSQLServer("nysvrprod01", "", "",
DTS.DTSSQLServerStorageFlags.DTSSQLStgFlag_Default, , , , "New Package")

'MsgBox("PACKAGE EXECUTION BEGINNING")
addListItems("PACKAGE EXECUTION BEGINNING")

pkg.Execute()

'MsgBox("PACKAGE EXECUTION COMPLETED")

addListItems("PACKAGE EXECUTION COMPLETED")

'MsgBox("The package contained steps." & pkg.Steps.Count.ToString)

addListItems("The package contained steps." &
pkg.Steps.Count.ToString)

pkg.UnInitialize()
pkg = Nothing
cpPoint.Unadvise(intCookie)
cpPoint = Nothing
cpContainer = Nothing
PES = Nothing
Catch exc As Exception
MsgBox(exc.Message)
Finally
pkg = Nothing
'Debug.ReadLine()
End Try




Private Sub PES_Message(ByVal sMessage As String) Handles PES.Message

addListItems(sMessage)
Application.DoEvents()

End Sub
 
If I do that I get

---------------------------
WindowsApplication1
---------------------------
Object reference not set to an instance of an object.
---------------------------
OK
---------------------------

What's funny is that If I replace this

Private Sub PES_Message(ByVal sMessage As String) Handles PES.Message

addListItems(sMessage)
Application.DoEvents()

End Sub

with

Private Sub PES_Message(ByVal sMessage As String) Handles PES.Message

msgbox(sMessage)
End Sub

I get the messagebox with "Error". So it works with the messagebox. But If
I change it to add to any control like


addListItems(sMessage) or textbox1.text = sMessage

Thanks
 
Seems like a perfect threading issue -
try writing Form1.addlistitems instead of just calling addlistitems from
PES_Message

in debugger did u check the state of the threads ?
 
I tried this

me.addListItems(sMessage)
because form1 didn't list the sub. How do I check the state of the threads?
 
Back
Top