(7)Delphi 2009 之 TStringBuilder 类[5]: Chars[] 属性与 CopyTo 方法

  • A+
所属分类:[开发技巧]

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

//TStringBuilder.CopyTo
procedure TForm1.Button1Click(Sender: TObject);
var
  sb: TStringBuilder;
  arr: TCharArray;
  i: Integer;
begin
  sb := TStringBuilder.Create;
  sb.Append('123456789');

  SetLength(arr, 9);
  for i := Low(arr) to High(arr) do arr[i] := '*';

  sb.CopyTo(3, arr, 1, 5);
  ShowMessage(PChar(arr));   {*45678***}

  sb.Free;
end;

//TStringBuilder.Chars
procedure TForm1.Button2Click(Sender: TObject);
var
  sb: TStringBuilder;
begin
  sb := TStringBuilder.Create(' 2009');

  ShowMessage(sb.Chars[0]);             {D}
  ShowMessage(sb.Chars[sb.Length - 1]); {9}

  sb.Free;
end;

end.

200809221801336305.rar

  • 我的微信
  • 这是我的微信扫一扫
  • weinxin
  • 我的微信公众号
  • 我的微信公众号扫一扫
  • weinxin
广告也精彩
avatar
广告也精彩

发表评论

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen: