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Habe auch noch eine Funktion für GetLocaleInfo geschrieben:
(Evtl für die Code-Lib)

Delphi-Quellcode:

function GetWindowsLanguage(LCTYPE: LCTYPE {type of information}): string;
var
  Buffer : PChar;
  Size : integer;
begin
  Size := GetLocaleInfo (LOCALE_USER_DEFAULT, LCType, nil, 0);
  GetMem(Buffer, Size);
  try
    GetLocaleInfo (LOCALE_USER_DEFAULT, LCTYPE, Buffer, Size);
    Result := string(Buffer);
  finally
    FreeMem(Buffer);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Caption := GetWindowsLanguage(LOCALE_SABBREVLANGNAME);
 (*
  LOCALE_ILANGUAGE           { language id }
  LOCALE_SLANGUAGE           { localized name of language }
  LOCALE_SENGLANGUAGE        { English name of language }
  LOCALE_SABBREVLANGNAME     { abbreviated language name }
  LOCALE_SNATIVELANGNAME     { native name of language }
 *)
end;