VB.NET

Check if a MIME Part is Plain Text

Demonstrates the Chilkat Mime.IsPlainText method, which returns whether the Content-Type is exactly text/plain. 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: Inside a multipart/alternative, this is how you pick out the plain-text rendering — the fallback to show when HTML cannot be displayed, or the version to index for search. It is the specific counterpart to IsHtml.

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Dim success As Boolean = False

'  Demonstrates the Mime.IsPlainText method, which returns whether the Content-Type is text/plain.  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.IsPlainText()) Then
        Debug.WriteLine("Part " & i & " (" & part.ContentType & ") is plain text.")
    End If

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