VB.NET

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

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VB.NET

Dim success As Boolean = False

Dim mime As New Chilkat.Mime
success = mime.LoadMimeFile("qa_data/multipart_message.eml")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


'  PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
'  and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
'  the parent tree.
Dim n As Integer = mime.NumParts
Debug.WriteLine("Number of parts: " & n)

Dim part As New Chilkat.Mime
Dim i As Integer
For i = 0 To n - 1
    success = mime.PartAt(i,part)
    If (success = False) Then
        Debug.WriteLine(mime.LastErrorText)
        Exit Sub
    End If

    Debug.WriteLine("Part " & i & " Content-Type: " & part.ContentType)
Next