[fpc-devel] String and UnicodeString and UTF8String

LacaK lacak at zoznam.sk
Mon Jan 10 12:57:23 CET 2011


> AFAIK, in current Delphi (which I don't have) a "String" is a variable 
> that can contain dynamically coded  informations (such as locally 
> coded 8-Bit ANSI, UTF-8, UTF-16, ...) and - of course - know which 
> code it holds.
I understand "By default, variables declared as type String are 
*UnicodeString*.**", that String=UnicodeString
 See: http://docwiki.embarcadero.com/VCL/en/System.UnicodeString
 and also 
http://docwiki.embarcadero.com/RADStudio/en/String_Types#UnicodeString

Note alse, that AnsiString holds additional informations about character 
encoding:
 "The AnsiString 
<http://docwiki.embarcadero.com/VCL/en/System.AnsiString> structure 
contains a 32-bit length indicator, a 32-bit reference count, a 16-bit 
data length indicating the number of bytes per character, and a 16-bit 
code page."

-Laco.

>
> If a string is generated by the VCL from a Window API function, the 
> coding will be UTF-16, though, but if you create a string with some 
> other coding it will be automatically re-coded to UTF16 before sending 
> it into a Windows API function.
>
> -Michael
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