B4X

Check if a MIME Entity is Multipart

Demonstrates the Chilkat Mime.IsMultipart method, which returns whether the Content-Type begins with multipart/. It takes no arguments.

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

Background: The first question when processing a message is usually whether it is a single part or a container of parts, because that decides whether you read the body directly or iterate children. IsMultipart answers it for any of the multipart subtypes at once; use the more specific predicates when the exact subtype matters.

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Dim success As Boolean = False

'  Demonstrates the Mime.IsMultipart method, which returns whether the Content-Type begins with multipart/.  It takes no arguments.

Dim mime As ChilkatMime
mime.Initialize
success = mime.LoadMimeFile("qa_data/multipart_message.eml")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


If mime.IsMultipart Then
    Log("This is a multipart entity.")
Else
    Log("This is not a multipart entity.")
End If