MIME Multipart Boundary and Preamble Properties

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Demonstrates the Boundary property, which gets or sets the raw boundary token of a multipart entity (without surrounding quotation marks), and UseMmDescription, which controls whether the conventional preamble text is emitted when serializing a multipart entity.

Dim success As Boolean = False

Dim mime As ChilkatMime
mime.Initialize

'  Create a multipart/mixed entity.
success = mime.NewMultipartMixed
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


'  Boundary is the raw boundary token, without surrounding quotation marks.  Chilkat quotes it
'  automatically in the serialized header when required.
mime.Boundary = "example-boundary"

'  UseMmDescription controls whether the conventional preamble text
'  "This is a multi-part message in MIME format." is emitted.  The default is False.
mime.UseMmDescription = True

'  Add a simple part so the multipart has content.
Dim part As ChilkatMime
part.Initialize
success = part.SetBodyFromPlainText("First part.")
If success = False Then
    Log(part.LastErrorText)
    Return
End If

success = mime.AppendPart(part)
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


Log("Boundary = " & mime.Boundary)

Dim mimeStr As String = mime.GetMime
If mime.LastMethodSuccess = False Then
    Log(mime.LastErrorText)
    Return
End If

Log(mimeStr)