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Delphi µÄ×Ö·û¼°×Ö·û´®[1] - string¡¢AnsiString¡¢WideString¡¢String[n]¡¢ShortString
2008-10-17 14:57:17
//×î³£ÓÃµÄ string
var
  str: string;   {¶¨Òå}
begin
  str := 'ÍòÒ»'; {¸³Öµ}
  ShowMessage(IntToStr(Length(str))); {³¤¶ÈÊÇ: 4}
end;
//³¤×Ö·û´® AnsiString; ÔÚµ±Ç°°æ±¾(2007)ÖеÄĬÈÏ״̬ÏÂ, String ¾ÍÊÇ AnsiString
var
  str: AnsiString;
begin
  str := 'ÍòÒ»';
  ShowMessage(IntToStr(Length(str))); {³¤¶ÈÊÇ: 4}
end;
//¿í×Ö·û´® WideString (ЧÂʲ»¼° AnsiString)
var
  str: WideString;
begin
  str := 'ÍòÒ»';
  ShowMessage(IntToStr(Length(str))); {³¤¶ÈÊÇ: 2}
end;
//¶¨³¤×Ö·û´®
var
  str1: String[6]; {Ö¸¶¨´óС²»Äܳ¬¹ý 255}
  str2: String[100];
begin
  {ÉÙ¸øÁËÒ²»áÕ¼ÄÇЩÄÚ´æ}
  str1 := 'ÍòÒ»';
  ShowMessage(str1);                   {ÍòÒ»}
  ShowMessage(IntToStr(Length(str1))); {4; ÕâÊÇ×Ö·û´®µÄ³¤¶È}
  ShowMessage(IntToStr(SizeOf(str1))); {7; ÕâÊÇÕ¼ÄÚ´æ´óС}
  {¶à¸øÁ˻ᱻ½Ø¶Ï}
  str1 := 'ÍòÒ»µÄ Delphi ²©¿Í';
  ShowMessage(str1);                   {ÍòÒ»µÄ}
  ShowMessage(IntToStr(Length(str1))); {6; ÕâÊÇʵ¼Ê±£´æµÄ×Ö·û´®³¤¶È}
  ShowMessage(IntToStr(SizeOf(str1))); {7; ÕâÊÇÕ¼ÄÚ´æ´óС}
  {ÎÊÌâ: ²»ÊÇÉùÃ÷´óСΪ 6 Âð? Ôõô SizeOf ÊÇ 7 ? }
  {ÒòΪ¶¨³¤×Ö·û´®»á¶à³öÒ»¸öÊ××Ö½ÚÀ´¼ÇÒä×Ö·û´®µÄʵ¼Ê³¤¶È}
  {¾ÙÀý˵Ã÷, Èç¹û¸ø str2 °´Èçϸ³Öµ, ÄÇËüµÄÊ××Ö½Ú(str2[0])¿Ï¶¨´¢´æ×Å×Ö·û 'A'}
  str2 := 'iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii'; {65¸ö}
  ShowMessage(str2[0]);                {A}
  ShowMessage(IntToStr(Ord(str2[0]))); {65; ÕâÊÇ 'A' ÔÚ ASCII ÐòÁÐÖеÄÐòºÅ, ÓõľÍÊÇËü}
  {ÄÇÒÔºó¿ÉÒÔÓà Ord(str2[0]) À´´úÌæ Length ÅжÏ×Ö·û´®µÄ³¤¶ÈÂð? }
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