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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 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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