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++

#include <CkGlobal.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    //  Turn on auto Q/B decoding for all strings passed to any Chilkat method in any Chilkat class.
    CkGlobal glob;
    glob.put_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:
    const char *s_cafe = "=?utf-8?Q?Caf=C3=A9?=";
    CkStringBuilder s1;
    s1.Append(s_cafe);
    std::cout << s1.getAsString() << "\r\n";
    //  Output is Café

    const char *s_hello = "=?UTF-8?B?44GT44KT44Gr44Gh44Gv?=";
    CkStringBuilder s2;
    s2.Append(s_hello);
    std::cout << s2.getAsString() << "\r\n";
    //  Output is こんにちは
    }