I have written a message handler function in Outlook's Visual Basic (we're using Outlook 2003 and Exchange Server) to help me sort out incoming email.
It is working for me, except sometimes the rule fails and Outlook deactivates it.
Then I turn the rule back on and manually run it on my Inbox to catch up. The rule spontaneously fails and deactivates several times a day.
I would love to fix this once and for all.
This code showed me the different TypeNames that were in my Inbox:
Public Sub GetTypeNamesInbox()
Dim myOlItems As Outlook.Items
Set myOlItems = application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox).Items
Dim msg As Object
For Each msg In myOlItems
Debug.Print TypeName(msg)
'emails are typename MailItem
'Meeting responses are typename MeetingItem
'Delivery receipts are typename ReportItem
Next msg
End Sub
HTH
I use the following VBA code snippet in other Office Applications, where the Outlook Library is directly referenced.
' Outlook Variables
Dim objOutlook As Outlook.Application: Set objOutlook = New Outlook.Application
Dim objNameSpace As Outlook.NameSpace: Set objNameSpace = objOutlook.GetNamespace("MAPI")
Dim objFolder As MAPIFolder: Set objFolder = objNameSpace.PickFolder()
Dim objMailItem As Outlook.MailItem
Dim iCounter As Integer: iCounter = objFolder.Items.Count
Dim i As Integer
For i = iCounter To 1 Step -1
If TypeOf objFolder.Items(i) Is MailItem Then
Set objMailItem = objFolder.Items(i)
With objMailItem
etc.
have written a message handler function in Outlook's Visual Basic (we're using Outlook 2003 and Exchange Server) to help me sort out incoming email. It is working for me, except sometimes the rule fails and Outlook deactivates it. Then I turn the rule back on and manually run it on my Inbox to catch up. The rule spontaneously fails and deactivates several times a day. I would love to fix this once and for all.
Here is the code stripped of the functionality, but giving you an idea of how it looks:
Public WithEvents myOlItems As Outlook.Items
Public Sub Application_Startup()
' Reference the items in the Inbox. Because myOlItems is declared
' "WithEvents" the ItemAdd event will fire below.
' Set myOlItems = Outlook.Session.GetDefaultFolder(olFolderInbox).Items
Set myOlItems = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox).Items
End Sub
Private Sub myOlItems_ItemAdd(ByVal Item As Object)
On Error Resume Next
If TypeName(Item) = "MailItem" Then
MyMessageHandler Item
End If
End Sub
Public Sub MyMessageHandler(ByRef Item As MailItem)
Dim strSender As String
Dim strSubject As String
If TypeName(Item) <> "MailItem" Then
Exit Sub
End If
strSender = LCase(Item.SenderEmailAddress)
strSubject = Item.Subject
rem do stuff
rem do stuff
rem do stuff
End Sub
One error I get is "Type Mismatch" calling MyMessageHandler where VB complains that Item is not a MailItem. Okay, but TypeName(Item) returns "MailItem", so how come Item is not a MailItem?
Another one I get is where an email with an empty subject comes along. The line
strSubject = Item.Subject
gives me an error. I know Item.Subject should be blank, but why is that an error?
Thanks.
My memory is somewhat cloudy on this, but I believe that a MailItem is not a MailItem when it is something like a read receipt. (Unfortunately, the VBA code that demonstrated this was written at another job and isn't around now.)
I also had code written to process incoming messages, probably for the same reason you did (too many rules for Exchange, or rules too complex for the Rules Wizard), and seem to recall running into the same problem you have, that some items seemed to be from a different type even though I was catching them with something like what you wrote.
I'll see if I can produce a specific example if it will help.
There are many types of items that can be seen in the default Inbox.
In the called procedure, assign the incoming item to an Object
type variable. Then use TypeOf
or TypeName
to determine if it is a MailItem
. Only then should your code perform actions that apply to emails.
i.e.
Dim obj As Object
If TypeName(obj) = "MailItem" Then
' your code for mail items here
End If
Dim objInboxFolder As MAPIFolder
Dim oItem As MailItem
Set objInboxFolder = GetNamespace("MAPI").GetDefaultFolder(olFolderInbox)
For Each Item In objInboxFolder.Items
If TypeName(Item) = "MailItem" Then
Set oItem = Item
next
why not use a simple error handler for the code? Seriously. You could write an error for each read of a property or object that seems to fail. Then have it Resume no matter what. No need for complex error handling. Think of a test that shows an empty subject. Since you don't know what value it will return, if any, and it seems to error on an empty or blank subject, you need to picture it as a simple test with a possible error. Run the test as an if statement (one in which you will get an error anyway), and have the program resume on error.
On Error Resume Next
If object.subject = Null 'produces an error when subject is null, otherwise allows a good read
strSubject = "" 'sets the subject grab string to a null or empty string as a string
Else
strSubject = object.subject 'Sets the subject grab string to the subject of the message\item
End If
来源:https://stackoverflow.com/questions/78924/when-is-a-mailitem-not-a-mailitem