(VB.NET) Demonstrate the Global.AutoQBDecode property

The Global.AutoQBDecode property can be set to True to cause Q/B encoded string arguments passed to any Chilkat method to be automatically decoded before being used.

Note: This example requires Chilkat v10.0.0 or later.

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' Turn on auto Q/B decoding for all strings passed to any Chilkat method in any Chilkat class.
Dim glob As New Chilkat.Global
glob.AutoQBDecode = True

' ---------------------------------------------------------------------------------------------------------------------------------------------
' "Q" Encoding

' Quoted-Printable encoding is primarily used for text that is mostly ASCII with some non-ASCII characters. 
' It encodes these characters in a way that remains mostly readable and compatible with ASCII-only systems.

' How It Works with UTF-8:
' - ASCII characters (except special characters like `=`) are encoded as themselves.
' - Non-ASCII characters are represented by their UTF-8 byte values, each byte encoded as `=` followed by two hexadecimal digits. 
'   For example, the UTF-8 character "é" (U+00E9) is encoded as `=C3=A9`.

' For example, consider the text "Café" encoded in UTF-8. The UTF-8 bytes for "é" are `C3 A9`, so in Quoted-Printable, it looks like this:  Caf=C3=A9

' The "Q" encoding has this syntax:  "=?charset?q?encoded_text?="
' For example: "=?UTF-8?Q?Caf=C3=A9_announcement?="


' ------
' "B" Encoding

' Base64 encoding is used to encode non-ASCII text, making it more suitable for text with a high density of non-ASCII characters, such as those found in non-Western European languages.

' For example, consider the text "こんにちは" ("Hello" in Japanese).
' The "B" encoded string would be "=?UTF-8?B?44GT44KT44Gr44Gh44Gv?="

' ------
' Q encoding is suitable for text that is mostly ASCII.
' B Encoding is best for text that is densely packed with non-us-ascii chars, such as non-Latin (Asian) languages.
' ---------------------------------------------------------------------------------------------------------------------------------------------

' You can use Chilkat's online tool at Online Binary Encoder to pre-encode your literal strings before
' inserting them into your source code.

' When using the online tool, choose either "MIME header Q Encoding" or "MIME Header B Encoding".

' For example:
Dim s_cafe As String = "=?utf-8?Q?Caf=C3=A9?="
Dim s1 As New Chilkat.StringBuilder
s1.Append(s_cafe)
Debug.WriteLine(s1.GetAsString())
' Output is Café


Dim s_hello As String = "=?UTF-8?B?44GT44KT44Gr44Gh44Gv?="
Dim s2 As New Chilkat.StringBuilder
s2.Append(s_hello)
Debug.WriteLine(s2.GetAsString())
' Output is こんにちは