B4X

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.

B4X

'  Turn on auto Q/B decoding for all strings passed to any Chilkat method in any Chilkat class.
Dim glob As ChilkatGlobal
glob.Initialize
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 ChilkatStringBuilder
s1.Initialize
s1.Append(s_cafe)
Log(s1.GetAsString)
'  Output is Café


Dim s_hello As String = "=?UTF-8?B?44GT44KT44Gr44Gh44Gv?="
Dim s2 As ChilkatStringBuilder
s2.Initialize
s2.Append(s_hello)
Log(s2.GetAsString)
'  Output is こんにちは