unit1.pas

< Delphi网络通信协议分析与应用实现>>一书的源代码。

unit Unit1;

interface

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

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

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
    reg:TRegistry;
    re:boolean;
    mask:string;
begin
  reg:=TRegistry.Create();
  try
    Reg.RootKey :=  HKEY_LOCAL_MACHINE;
    //open key
    //win 9x
    re:=Reg.OpenKey('System\CurrentControlSet\Services\Class\NetTrans\0000',
                    false);

    if re then
        begin
            mask := Reg.Readstring('IPMask');
        end
    else
        begin
            edit1.text:='Failed to get mask';
            reg.closekey();
            reg.Free;
            exit;
        end;
  finally
    Reg.CloseKey;
    Reg.Free;
  end;
  edit1.text:=mask;

end;

end.