test1.pas

用来模拟PC机的串口

unit test1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
var
  ComH: integer;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ComH:= CreateFile (PChar('COM2'),
    GENERIC_READ or GENERIC_WRITE,0,nil,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,Longint(0));
  if (ComH=-1) then Application.Terminate;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  CloseHandle(ComH);
end;

end.