unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    Button2: TButton;    Button3: TButton;    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);    procedure Button3Click(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}var  R1: TRect = (Left:20; Top:20; Right:20; Bottom:20);  R2: TRect = (Left:20; Top:20; Right:20; Bottom:20);//EqualRectprocedure TForm1.Button1Click(Sender: TObject);var  s1,s2: string;begin  ShowMessage(BoolToStr(EqualRect(R1,R2), True));  {True}  OffsetRect(R2, 10, 10);  ShowMessage(BoolToStr(EqualRect(R1,R2), True));  {False}end;//EqualSid: 它可用于判断所有结构; EqualRect 是专用于 TRect 的.procedure TForm1.Button2Click(Sender: TObject);begin  ShowMessage(BoolToStr(EqualSid(@R1,@R2), True)); {True}  OffsetRect(R2, 10, 10);  ShowMessage(BoolToStr(EqualSid(@R1,@R2), True)); {False}end;//EqualPrefixSid: 它和 EqualSid 的用法一样, 可能是适用于和服务器联系的.procedure TForm1.Button3Click(Sender: TObject);begin  ShowMessage(BoolToStr(EqualPrefixSid(@R1,@R2), True)); {True}  OffsetRect(R2, 10, 10);  ShowMessage(BoolToStr(EqualPrefixSid(@R1,@R2), True)); {False}end;end.