B4X

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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Dim success As Boolean = False

Dim mime As ChilkatMime
mime.Initialize
success = mime.LoadMimeFile("qa_data/multipart_message.eml")
If success = False Then
    Log(mime.LastErrorText)
    Return
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 Int = mime.NumParts
Log("Number of parts: " & n)

Dim part As ChilkatMime
part.Initialize
Dim i As Int
For i = 0 To n - 1
    success = mime.PartAt(i, part)
    If success = False Then
        Log(mime.LastErrorText)
        Return
    End If

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