Convert UCS4 to UNicodeChar.
Source position: unicodedata.pas line 487
| procedure FromUCS4( | 
| const AValue: UCS4Char; | 
| out AHighS: UnicodeChar; | 
| out ALowS: UnicodeChar | 
| ); | 
| AValue | 
 | UCS4 encoded unicode character. | 
| AHighS | 
 | High character of surrogate pair. | 
| ALowS | 
 | Low character of surrogate pair. | 
FromUCS4 converts the UCS4 encoded unicode character AValue to a set of unicode (surrogate pair) characters encoded in UTF16: AHighS, ALowS.
| 
 | Encode unicode UTF16 surrogate pair to UCS4 character. | |
| 
 | Check if a UTF16 character is the high character in a surrogate pair. | |
| 
 | Check if a UTF16 character is the low character in a surrogate pair. | |
| 
 | Check if a pair of UTF16 encoded characters is a valid surrogate pair. |