unit1.~pas

Delphi的函数例子

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
TextBuffer:PChar;
Ptr:PChar;
begin
GetMem(TextBuffer,Length(Edit1.Text)+1);
StrCopy(TextBuffer,PChar(Edit1.Text));
Ptr:=StrEnd(TextBuffer);
Label1.Caption:='';
while Ptr>=TextBuffer do
begin
Ptr:=Ptr-1;
Label1.Caption:=Label1.Caption+Ptr^;
end;
FreeMem(TextBuffer);

end;

end.