[fpc-pascal] Using AnsiString/WideString with C Library

[gmjimen at burdjia.com]

Hello.

I'm writing a wrapper for a C library that allows the use of UNICODE. I did
wrappers for C libraries but using only ASCII strings. I did:

UNIT example;

INTERFACE

PROCEDURE Proc (Text: ANSISTRING);

IMPLEMENTATION

  { Wrapper for the C function. }
  PROCEDURE _C_Proc_ (Text: PCHAR); CDECL; EXTERNAL 'lib.dll' NAME 'proc';

PROCEDURE Proc (Text: ANSISTRING);
BEGIN
  _C_Proc (PCHAR (Text));
END;

END.

This way I can use Pascal strings with C functions.

I've read the documentation and I find that I can use WIDESTRING in a similar
way, but I'm not sure which character codification WIDESTRING uses. The C
library uses 'standard C strings' (that is 'char *string;') an there's a
function to define the character codification to be used by the library. It's
possible to use ASCII, UTF-8, UTF-16 and UTF-32.

Can WIDESTRING use all UNICODE codifications and ASCII strings?

If it can't, is there a way to use UNICODE strings?

Thanks in advance.

Guillermo Martínez Jiménez

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