Is this a bug (Windows API)?

Question

I had a question about normalizing strings, and the answer was already given, but the problem is that I can’t correctly normalize Korean characters that require 3 keystrokes.
When you type “ㅁ ㅜㄷ” (from pressing the “ane” keys), "무 ㄷ" instead of "묻".
When you enter "ㅌ ㅐ ㅇ" (by pressing the "xod" keys), instead of "탱", "태 ㅇ" appears.

This is Mr. Dean's answer, and while he was working on the example that I gave at first ... he does not work with the one I cited above.

If you use .NET, the following will work:

var s = "ㅌㅐㅇ";
s = s.Normalize(NormalizationForm.FormKC);

In native Win32, the corresponding call to NormalizeString :

wchar_t *input = "ㅌㅐㅇ";
wchar_t output[100];
NormalizeString(NormalizationKC, input, -1, output, 100);

NormalizeString is only available on Windows Vista +. You need to install the "Microsoft Internationalized Domain Names (IDN) APIs" if you want to use it on XP (why is this in the IDN download, I don’t understand ...)

Note that none of these methods actually require the use of IMEs - they work regardless of whether you have Korean IME installed or not.

This is the code I use in delphi (with XP):

      var  buf: array [0..20] of char;
      temporary: PWideChar;
      const NORMALIZATIONKC=5;
      ...
      temporary:='ㅌㅐㅇ';
      NormalizeString(NORMALIZATIONKC , temporary, -1, buf, 20);
      showmessage(buf);

This is mistake? Is there something wrong in my code? Does the code work correctly on your computer? What language? What version of Windows are you using?

Answer 1

jamo (ㅌㅐㅇ) Hangul Compatibility Jamo, - . ( NFKD), jamo Hangul Jamo (ᄐ ᅢ ᆼ, sans , , ), .

Unicode 5.2 :

jamo , NFKD NFKC, jamo .

(...)

12-11 , jamo , NFKD NFKC.

, NFKC , Jamo, Windows, , . , NFKD, , Jamo, NFKC , .

(IME), , Jamo, NFKD, NFKC. IME "" Jamo Jamo.