C#

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.

C#

//  Turn on auto Q/B decoding for all strings passed to any Chilkat method in any Chilkat class.
Chilkat.Global glob = 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:
string s_cafe = "=?utf-8?Q?Caf=C3=A9?=";
Chilkat.StringBuilder s1 = new Chilkat.StringBuilder();
s1.Append(s_cafe);
Debug.WriteLine(s1.GetAsString());
//  Output is Café

string s_hello = "=?UTF-8?B?44GT44KT44Gr44Gh44Gv?=";
Chilkat.StringBuilder s2 = new Chilkat.StringBuilder();
s2.Append(s_hello);
Debug.WriteLine(s2.GetAsString());
//  Output is こんにちは