On Fri, Nov 21, 2008 at 11:08 PM, Graeme Geldenhuys <[EMAIL PROTECTED]> wrote: > > I thought you guys might find this interesting. It's a new 27 page > document describing Unicode support in D2009. > > http://dn.codegear.com/article/38980
Seeing that I don't own D2009 and only read about it's Unicode support I found some of the information interesting - and it was things we argued about in this mailing list. For example: 1... Length() returns the bytes for UTF8String but Length() returns the elements (what we know as characters) for String or UTF16 strings. Length() also returns bytes for AnsiString. -------------------- var str8: Utf8String; str16: string; begin str8 := 'Cantù'; Memo1.Lines.Add ('UTF-8'); Memo1.Lines.Add('Length: ' + IntToStr (Length (str8))); Memo1.Lines.Add('5: ' + IntToStr (Ord (str8[5]))); Memo1.Lines.Add('6: ' + IntToStr (Ord (str8[6]))); str16 := str8; Memo1.Lines.Add ('UTF-16'); Memo1.Lines.Add('Length: ' + IntToStr (Length (str16))); Memo1.Lines.Add('5: ' + IntToStr (Ord (str16[5]))); As you might expect, the str8 string has a length of 6 (meaning 6 bytes), while the str16 string has a length of 5 (meaning 10 bytes, though). Notice that Length invariably returns the number of string elements, which in case of variable-length representations don't match the number of Unicode code points represented by the string. This is the output of the program: UTF-8 Length: 6 5: 195 6: 185 UTF-16 Length: 5 5: 249 -------------------- 2... TStrings can now take an encoding parameter to specify how it should load or save files. ----------------------------- STREAMING TSTRINGS The ReadFromFile and WriteToFile methods of the TStrings class can be called with an encoding. If you write a string list to text file without providing a specific encoding, the class will use TEncoding.Default, which uses the internal DefaultEncoding in turn extracted at the first occurrence by the current Windows code page. In other words, if you save a file you'll get the same ANSI file as before. Of course, you can also easily force the file to a different format, for example the UTF-16 format: Memo1.Lines.SaveToFile('test.txt', TEncoding.Unicode); ----------------------------- anyway, there are a lot more interesting facts in this document. Well worth reading to get a better understanding of unicode. Regards, - Graeme - _______________________________________________ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/
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