Xojo Plugin

Check if a MIME Part is an Attachment

Demonstrates the Chilkat Mime.IsAttachment method, which returns whether the current part's Content-Disposition is attachment (matched case-insensitively). 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: Whether a part is an attachment is about disposition, not content type — an image can be inline (Content-Disposition: inline) or an attachment. This predicate keys off that header, which is the right basis for deciding what to list as a downloadable attachment versus what to render within the message body.

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Xojo Plugin

Dim success As Boolean
success = False

//  Demonstrates the Mime.IsAttachment method, which returns whether the part's Content-Disposition is attachment.  It takes no arguments and applies to the current
//  part.  This example iterates the parts of a multipart message and reports which ones match.

Dim mime As New Chilkat.Mime
success = mime.LoadMimeFile("qa_data/multipart_message.eml")
If (success = False) Then
    System.DebugLog(mime.LastErrorText)
    Return
End If

Dim n As Int32
n = mime.NumParts
Dim part As New Chilkat.Mime
Dim i As Int32
For i = 0 To n - 1
    success = mime.PartAt(i,part)
    If (success = False) Then
        System.DebugLog(mime.LastErrorText)
        Return
    End If

    If (part.IsAttachment()) Then
        System.DebugLog("Part " + Str(i) + " (" + part.ContentType + ") is an attachment.")
    End If

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