(VB.NET UWP/WinRT) Get the text body content of a MIME part.

Explains and demonstrates the GetBodyEncoded and GetBodyDecoded methods. This example uses the MIME test data located at http://www.chilkatsoft.com/testData/sampleMime1.txt

The sampleMime1.txt contains:

Content-Type: multipart/mixed;
 boundary="------------070404010201060604000708";

This is a multi-part message in MIME format.

--------------070404010201060604000708
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="utf-8";

Falsches =C3=9Cben von Xylophonmusik qu=C3=A4lt jeden gr=C3=B6=C3=9Feren Zwe=
rg.
--------------070404010201060604000708
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset="utf-8";

RmFsc2NoZXMgw5xiZW4gdm9uIFh5bG9waG9ubXVzaWsgcXXDpGx0IGplZGVuIGdyw7bDn2VyZW4g
Wndlcmcu

--------------070404010201060604000708
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset="iso-8859-1";

Falsches Üben von Xylophonmusik quält jeden größeren Zwerg.
--------------070404010201060604000708--

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim mime As New Chilkat.Mime

' Load the sampleMime1.txt file into the MIME object.
' (This file is available at http://www.chilkatsoft.com/testData/sampleMime1.txt )

Dim success As Boolean = mime.LoadMimeFile("sampleMime1.txt")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


' The sampleMime1.txt is a MIME document with a top-level 
' multipart/mixed containing 3 sub-parts, each of which has the 
' same body text but with different content-transfer-encodings and 
' using different character encodings (utf-8 and iso-8859-1).

' Calling mime.GetBodyEncoded or mime.GetBodyDecoded on the 
' top-level multipart/mixed MIME object will return an empty string.
' It is because the "body" of a multipart MIME object is always empty.
' A multipart MIME object contains sub-parts (each a MIME object),
' and it is only the leaf-objects that can have non-empty bodies.

' Get GetBodyDecoded method returns the body text decoded
' from whatever the content-transfer-encoding may be, and
' converted from whatever charset encoding might be used.
' In this case, calling GetBodyDecoded on each of the three
' sub-parts will return the same string.
' To demonstrate:
Dim part1 As Chilkat.Mime
part1 = mime.GetPart(0)
Debug.WriteLine(part1.GetBodyDecoded())

Dim part2 As Chilkat.Mime
part2 = mime.GetPart(1)
Debug.WriteLine(part2.GetBodyDecoded())

Dim part3 As Chilkat.Mime
part3 = mime.GetPart(2)
Debug.WriteLine(part3.GetBodyDecoded())

' The GetBodyEncoded method will NOT decode from 
' whatever content-transfer-encoding is used.  However, it will
' convert from whatever internal character encoding
' may be used to return a string appropriate for the calling
' programming language (for example, in .NET or any language
' using ActiveX, all strings are Unicode..)
Debug.WriteLine(part1.GetBodyEncoded())
Debug.WriteLine(part2.GetBodyEncoded())
Debug.WriteLine(part3.GetBodyEncoded())