模拟按下键盘上的某个键

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Timer1: TTimer;
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  postmessage(edit1.Handle,WM_KEYDOWN,65,0);           //通过向编辑框1对象发送按键码值为65
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  postmessage(form1.Handle,WM_KEYDOWN,VK_TAB,0);       //通过向Form1对象发送按键码值为TAB
end;

end.