Re: Printing unicode characters
Nikolay Nikolov via fpc-pascal <[email protected]>
| Newsgroups | gmane.comp.compilers.free-pascal.general |
|---|---|
| Message-ID | <[email protected]> |
On 12/1/24 8:14 AM, Hairy Pixels via fpc-pascal wrote:
> ChatGPT is saying I can print unicode scalars like that but i don’t
> see it works and no compiler warnings even. Did it make this up or did
> I do something wrong?
>
> Writeln('Unicode scalar 1F496: ', #$1F496); // 💖
This works for me under Linux (Fedora), if I include the unit cwstring.
Haven't tested other platforms.
> Writeln('Unicode scalar 1F496: ', WideChar($1F496)); // 💖
This one doesn't work. WideChar is 16-bit, and $1F496 doesn't fit. It
also produces a warning:
Warning: range check error while evaluating constants (128150 must be
between 0 and 65535)
This is because a WideChar represents a single UTF-16 code unit. To
encode $1F496, you need two UTF-16 code units (high and low surrogate):
Writeln('Unicode scalar 1F496: ', WideChar((($1F496-$10000) shr
10)+$D800)+WideChar((($1F496-$10000) and $3FF)+$DC00)); // 💖
More info here:
https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF
Nikolay
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