B4X

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


Dim n As Int = mime.NumParts
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

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

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