PHolroyd
asked on
Problems with VB.NET COM Class Implementing an SMTP OnArrival event sink
Phew, Long title eh.
Basically I need to intercept Emails using the SMTP Sevice and the OnArrival event sink. I've come up with the following simple test app :-
<ComClass(ComClass1.ClassI
Public Class ComClass1
#Region "COM GUIDs"
' These GUIDs provide the COM identity for this class
' and its COM interfaces. If you change them, existing
' clients will no longer be able to access the class.
#End Region
' A creatable COM class must have a Public Sub New()
' with no parameters, otherwise, the class will not be
' registered in the COM registry and cannot be created
' via CreateObject.
Public Sub New()
MyBase.New()
End Sub
Public Overridable Sub OnArrival(ByVal Msg As CDO.Message, ByRef EventStatus As CDO.CdoEventStatus)
EventStatus = CDO.CdoEventStatus.cdoSkip
Dim sr As StreamWriter = File.AppendText("C:\Logfil
sr.WriteLine("Event Sink fired")
End Sub
End Class
I tick the 'Register for COM Interop' box under properties->configuration properties->build and DLL seems to compile ok with no errors.
I then registered the COM Class using Regasm :-
Regasm ClassLibrary.dll /codebase
and finally point the SMTP service to the event sink with the smtpreg script provided by microsoft :-
cscript smtpreg.vbs /add 1 OnArrival ClassLibrary ClassLibrary.ComClass "mail from=*"
The code in the event sink isn't run and nothing appears in the log file, but the smtp service does seem to open the DLL and use it because I can't access the DLL file after I send a test message to the smtp service until I reboot.
I assuming that my DLL is getting called but for some reason nothing happens after that. Can anyone see what I'm doing wrong?
I realise this is a tough one so I've assigned max points to the question.
Cheers
P Holroyd
Basically I need to intercept Emails using the SMTP Sevice and the OnArrival event sink. I've come up with the following simple test app :-
<ComClass(ComClass1.ClassI
Public Class ComClass1
#Region "COM GUIDs"
' These GUIDs provide the COM identity for this class
' and its COM interfaces. If you change them, existing
' clients will no longer be able to access the class.
#End Region
' A creatable COM class must have a Public Sub New()
' with no parameters, otherwise, the class will not be
' registered in the COM registry and cannot be created
' via CreateObject.
Public Sub New()
MyBase.New()
End Sub
Public Overridable Sub OnArrival(ByVal Msg As CDO.Message, ByRef EventStatus As CDO.CdoEventStatus)
EventStatus = CDO.CdoEventStatus.cdoSkip
Dim sr As StreamWriter = File.AppendText("C:\Logfil
sr.WriteLine("Event Sink fired")
End Sub
End Class
I tick the 'Register for COM Interop' box under properties->configuration properties->build and DLL seems to compile ok with no errors.
I then registered the COM Class using Regasm :-
Regasm ClassLibrary.dll /codebase
and finally point the SMTP service to the event sink with the smtpreg script provided by microsoft :-
cscript smtpreg.vbs /add 1 OnArrival ClassLibrary ClassLibrary.ComClass "mail from=*"
The code in the event sink isn't run and nothing appears in the log file, but the smtp service does seem to open the DLL and use it because I can't access the DLL file after I send a test message to the smtp service until I reboot.
I assuming that my DLL is getting called but for some reason nothing happens after that. Can anyone see what I'm doing wrong?
I realise this is a tough one so I've assigned max points to the question.
Cheers
P Holroyd
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ASKER
It's a similar solution to the one found in this article :-
http://support.microsoft.com/?id=315631
Only you create a .NET Library File instead of the ActiveX DLL. I then Entered this simple test code :-
Imports CDO
Public Class MyOnArrival
Implements ISMTPOnArrival
Sub OnArrival(ByVal Msg As Message, ByRef EventStatus As CdoEventStatus) Implements ISMTPOnArrival.OnArrival
Msg.TextBody = Msg.TextBody & "Intercepted"
Msg.DataSource.Save()
EventStatus = CdoEventStatus.cdoRunNextS
End Sub
End Class
Then instead of regsrvr32 you use regasm which is the .NET equivalent. For Example :-
regasm ClassLibrary.DLL /codebase
You then use the smptreg.vbs script to add your Library as an event sink on the server(Found in VS.NET and the Exchange Server SDK). For Example :-
cscript smtpreg.vbs /add 1 OnArrival ClassLibrary ClassLibrary.MyOnArrival "mail from=*"
I've put the DLL in the same directory the SMTP service sits in, but I don't know if it actually needs to there or not.
This now seems to work and incoming Emails are intercepted.
The DLL is still not accesable after the code has been called and run once though, making it difficult to ammend the code, recompile and copy it to the SMTP service directory without a reboot. So if anyone's got a soloution to this I'd be greatful.