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Code level: advanced    Code area: Outlook Expert Techniques Printer Friendly Version
Title: Distinguishing embedded attachments
Description: Using Redemption to work with the Attachment.Fields collection, we can determine whether a particular attachment is embedded in the message by getting its content ID. That ID can also be used to match up the attachment with particular src attributes in the body of an HTML message. (Similar code could be built with CDO instead of Redemption.)
Date: 07-Jan-2003  13:47
Code level: advanced
Code area: Outlook Expert Techniques
Posted by: Sue Mosher
Body:
All 17comments
Page [ 1 2 Next >> ]   
  07-Jan-2003  22:25   
See http://www.outlookcode.com/codedetail.aspx?id=27 for the other side of this issue -- creating a message that includes an embedded image attachment.
  28-Feb-2003  17:14   
This does not always work. For some reason, I was viewing an email that was had like 19 attachments reported by Redemption and Outlook OM, but none of the "attachments" had CIDs. The email was almost pure HTML and there were in fact no attachments.



On the other hand, if a message has an attachment, it will definitely be represented in the MIME header. So you grab the mime header and parse it into sections, inspecting each section for key value pairs such as:

    Content-Disposition: attachment;



The section that contains this pair is below:

------_=_NextPart_002_01C2DF6A.922C985E--

------_=_NextPart_001_01C2DF6A.922C985E

Content-Type: image/gif;

    name="loginbtn.gif"

Content-Transfer-Encoding: base64

Content-Description: loginbtn.gif

Content-Disposition: attachment;

    filename="loginbtn.gif"



It is clear that this is infact explicitly an attachment.



I'm always leery of logic that depends on a missing value such as the lack of a CID, not all mail systems use it I guess.

 
  28-Feb-2003  19:02   
Sue had it just about right. Forget the mime header junk. Use the content id and the PR_ATTACH_FLAGS properties together.



 
  14-Jul-2004  11:19   
Not much of a programmer myself, but I managed to get this working with CDO:
Probably needs some cleaning up, here & there....
Regards, Joost

Sub check_CID_with_CDO()
    Dim itm As Object
    Dim objSMail As MAPI.Message
    Dim objSAtt As MAPI.Attachment
    Dim obj As Object
    Dim objSession As MAPI.Session
    Dim strCID As String
    On Error Resume Next
    
    Set objSession = CreateObject("MAPI.Session")
    objSession.Logon , , False, False
    Set itm = GetCurrentItem()
    If itm.Class = olMail Then
        Set objSMail = CreateObject("MAPI.Message")
        strEntryID = itm.EntryID
        Set oMsg = objSession.GetMessage(strEntryID)
    For Each objSAtt In oMsg.Attachments
            ' Get the content-ID for the attachment,
            ' if present. Thanks to Dmitry Streblechenko,
            ' author of Redemption, for the proptag.
            ' x3712001f for RTF ????
        strCID = objSAtt.Fields(&H3712001E)
        If strCID = "" Then
           MsgBox "Content-id is Empty, so attachment is not embedded..."
           Else
               MsgBox "Content-id = " & strCID & _
               " So it is embedded..."
        End If
        strCID = ""
        Next
    End If
    
    Set objSAtt = Nothing
    Set itm = Nothing
End Sub


Function GetCurrentItem() As Object
    Dim objApp As Outlook.Application
        
    Set objApp = CreateObject("Outlook.Application")
    On Error Resume Next
    Select Case TypeName(objApp.ActiveWindow)
        Case "Explorer"
            Set GetCurrentItem = objApp.ActiveExplorer.Selection.Item(1)
        Case "Inspector"
            Set GetCurrentItem = objApp.ActiveInspector.CurrentItem
        Case Else
            ' anything else will result in an error, which is
            ' why we have the error handler above
    End Select
    
    Set objApp = Nothing
End Function
 
  19-Aug-2004  12:58   
So let's say I copy the book logo from this site and past it in the message body of an outgoing message (html format) and use the code at the top of this thread to determine if there are any embedded attachments when the message is sent. The book.gif file is considered "not embedded" because it doesn't have a CID. I'm thinking it should be considered embedded because it's in the body of the email but maybe embedded means an attachment that is actually sent with the email (has a CID). Am I making any sense?

I guess what I'm really getting at is:
What is an embedded attachment?
I was thinking it's a file inside the message body, but am not really sure now.
  02-Nov-2004  05:16   
Could anyone please tell me why this code will not work? I have used the example to attach the graphic but it keeps showing up as an attachment and a red x in the box where the graphic goes.
  18-Jul-2006  17:12   
Hi Sue

I followed the script from the article "Add embedded image to HTML message (VBScript)" and combined it with redemption which I am already using for the Outlook security warning issue.

When I embed one image everything works fine and when I send the email the person recieving the email does see any attached files. As soon as I try to embed more than one image I have a problem. The email in the Outlook outbox is fine but when the email is recieved you can now see the files as attachments in the attachments field.

The following is the code I used: (From the redemption site)

        Set sItem = CreateObject("Redemption.SafeMailItem")
        sItem.Item = Connect.MyMailItem
        PT_BOOLEAN = 11
        PR_HIDE_ATTACH = sItem.GetIDsFromNames("{00062008-0000-0000-C000-000000000046}", &H8514) Or PT_BOOLEAN
        sItem.Fields(PR_HIDE_ATTACH) = True
         
        Set Attach1 = sItem.Attachments.Add("C:\Documents and Settings\Ryan\Application Data\Microsoft\Stationery\Top_01.gif")
        Attach1.Fields(&H370E001E) = "image/jpeg"
        Attach1.Fields(&H3712001E) = "img01"

Please tell me what I need to do for multiple embedded files.

Thanks in advance
Ryan
  18-Jul-2006  17:33   
Hi Sue

An update to my post from just now. I have noticed that the problem does not occur unless I have created the mail but before hitting send and recieve I open the mail in the outbox and then click the send button again, it is when I go through this procedure that person recieving the mail can see the attachments.

Regards
Ryan
  21-Jul-2006  16:13   
Then, don't do that. The code method is intended to work without any user intervention. If you display the message, you'll get unintended results, as you've learned.

Also, I think you may need to set the field on the message *after* you add the attachments and set their properties.
  05-Jul-2007  00:41   
I copy ur code in VBE and restart MS Office outlook 2003 but it is not working.
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