VB.NET

Check if a MIME Part is Text

Demonstrates the Chilkat Mime.IsText method, which returns whether the Content-Type begins with text/. 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: IsText is the broad check for any textual part — text/plain, text/html, text/xml, and so on — which is what decides whether it is safe to decode the body to a string. For binary parts, decode to bytes instead. Use the narrower predicates when you need the exact text subtype.

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Dim success As Boolean = False

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

Next