VB.NET

Check if a MIME Part is Application Data

Demonstrates the Chilkat Mime.IsApplicationData method, which returns whether the Content-Type begins with application/. It takes no arguments and applies to the current part.

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 application/ family covers everything that is not plain media or text — PDFs, Office documents, ZIP archives, JSON, and the S/MIME application/pkcs7-* types. This broad check is a quick way to flag "binary document" parts, though you will usually look at the specific subtype to decide how to handle each.

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Dim success As Boolean = False

'  Demonstrates the Mime.IsApplicationData method, which returns whether the Content-Type begins with application/.  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
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


Dim n As Integer = mime.NumParts
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

    If (part.IsApplicationData()) Then
        Debug.WriteLine("Part " & i & " (" & part.ContentType & ") is application data.")
    End If

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