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HIGHCHARUNICODE directive (Delphi)

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Type

Switch

Syntax

{$HIGHCHARUNICODE ON} or {$HIGHCHARUNICODE OFF}

Default

{$HIGHCHARUNICODE OFF}

Scope

Local



Remarks

The {$HIGHCHARUNICODE ON} directive controls the behavior of characters #$80 ... #$FF (#128 ... #255).

When HIGHCHARUNICODE is OFF:

  • All decimal #xxx n-digit literals are parsed as AnsiChar.
  • All hexadecimal #$xx 2-digit literals are parsed as AnsiChar.
  • All hexadecimal #$xxxx 4-digit literals are parsed as WideChar.

When HIGHCHARUNICODE is ON:

  • All literals are parsed as WideChar.


Example:

In the following example:

  • (U + 0080) is a control character; it is absent on ANSI codepages (converted to '?').
  • (U + 00C8) is 'È' character; it is present on the Win1252 codepage and absent on the Win1251 codepage (converted to 'E').
 var
   A: AnsiChar;
   W: WideChar;
 
 begin
 
 {$HIGHCHARUNICODE OFF}
   A := #$80; // Ord(A) = $80
   W := #$80; // Ord(W) depends on default ANSI codepage; for example
              //   = $0402 for Win1251 codepage ('Ђ')
              //   = $20AC for Win1252 codepage ('€');
 
 {$HIGHCHARUNICODE ON}
   A := #$80; // Ord(A) = $3F ('?')
   W := #$80; // Ord(W) = $80
 
   A := #200; // Ord(A) depends on default ANSI codepage; for example
              //   = $45 for Win1251 codepage ('E')
              //   = $C8 for Win1252 codepage ('È');
   W := #200; // Ord(W) = 200 ($C8) 
 
 end;

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