[fpc-devel] Trying to understand the wiki-Page "FPC Unicode support"
mschnell at lumino.de
Wed Nov 26 16:19:32 CET 2014
On 11/26/2014 03:05 PM, Sven Barth wrote:
> > OK. So in Delphi XE (in Germany) String(CP_ACP) is the same as
> String(CP1252) but different from String without brackets which in
> turn is the same as String(CP_UTF16) ? Correct ?
> There is no "String with brackets". You can only use "AnsiString"
> followed by brackets, not "String". And "String" in Delphi 2009+ is
> the same as UnicodeString which is a different compiler internal type
> than AnsiString(CP_UTF16) would be if it would be allowed.
> While both AnsiString and UnicodeString have the current codepage and
> the character size in their header record the code page is only used
> for AnsiString and the size can not he influenced in any way (for an
> AnsiString it's always 1 and for a UnicodeString it's always 2).
So what is the notation in Delphi (and hence supposedly in FPC with
"mode delphiunicode") to define a variable with the (static) string
encoding type "CPXXXX" with XXX = 1252, UTF8, UTF16 ?
I found this:
CP_ACP = 0; // default to ANSI code page
CP_UTF16 = 1200; // utf-16
CP_UTF16BE = 1201; // unicodeFFFE
CP_UTF7 = 65000; // utf-7
CP_UTF8 = 65001; // utf-8
CP_ASCII = 20127; // us-ascii
CP_NONE = $FFFF; // rawbytestring encoding
So seemingly you could do MyStringType = type
AnsiString(CP_UTF16), and seemingly the size information is set
according to this.
> There is no UTF-32 string (at least not in the sense of a compiler
> provided type).
I see (It's a shame).
Thanks a lot for your patience,
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