Delphi 2009 Tstringbuilder class [5]: chars[] Property and CopyTo method

Source: Internet
Author: User

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('Delphi 2009');
 ShowMessage(sb.Chars[0]);       {D}
 ShowMessage(sb.Chars[sb.Length - 1]); {9}
 sb.Free;
end;
end.

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