Delphi类似个人防火墙开启和断开网络的代码[转载]

[点评:这里是针对网卡进行网络的启用和断开.]

unit Unit_FrmMain;

interface

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

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

var
  FrmMain: TFrmMain;

implementation

{$R *.dfm}

const
  iphlpapilib = 'iphlpapi.dll';
  MAX_INTERFACE_NAME_LEN = 256; // MPRAPI.H
  ANY_SIZE = 1;
  MAXLEN_IFDESCR = 256;
  MAXLEN_PHYSADDR = 8;
  MIB_IF_ADMIN_STATUS_UP = 1;
  MIB_IF_ADMIN_STATUS_DOWN = 2;
  MIB_IF_ADMIN_STATUS_TESTING = 3;
type
  _MIB_IFROW = record
    wszName: array[0..MAX_INTERFACE_NAME_LEN - 1] of WCHAR;
    dwIndex: DWORD;
    dwType: DWORD;
    dwMtu: DWORD;
    dwSpeed: DWORD;
    dwPhysAddrLen: DWORD;
    bPhysAddr: array[0..MAXLEN_PHYSADDR - 1] of BYTE;
    dwAdminStatus: DWORD;
    dwOperStatus: DWORD;
    dwLastChange: DWORD;
    dwInOctets: DWORD;
    dwInUcastPkts: DWORD;
    dwInNUcastPkts: DWORD;
    dwInDiscards: DWORD;
    dwInErrors: DWORD;
    dwInUnknownProtos: DWORD;
    dwOutOctets: DWORD;
    dwOutUcastPkts: DWORD;
    dwOutNUcastPkts: DWORD;
    dwOutDiscards: DWORD;
    dwOutErrors: DWORD;
    dwOutQLen: DWORD;
    dwDescrLen: DWORD;
    bDescr: array[0..MAXLEN_IFDESCR - 1] of BYTE;
  end;
  MIB_IFROW = _MIB_IFROW;

  _MIB_IFTABLE = record
    dwNumEntries: DWORD;
    table: array[0..ANY_SIZE - 1] of MIB_IFROW;
  end;
  MIB_IFTABLE = _MIB_IFTABLE;
  PMIB_IFTABLE = ^MIB_IFTABLE;

function GetIfTable(pIfTable: PMIB_IFTABLE; var pdwSize: ULONG; bOrder: BOOL): DWORD; stdcall; external iphlpapilib name 'GetIfTable';
function SetIfEntry(const pIfRow: MIB_IFROW): DWORD; stdcall; external iphlpapilib name 'SetIfEntry';

procedure TFrmMain.Button1Click(Sender: TObject);
var
  dwSize: DWORD;
  mit: PMIB_IFTABLE;
  i: integer;
begin
  //dwSize := 0;
  //mit := nil;
  GetIfTable(nil, dwSize, TRUE);
  mit := GetMemory(dwSize);
  if GetIfTable(mit, dwSize, TRUE) = NO_ERROR then
    for i := 0 to Pred(mit^.dwNumEntries) do
    begin
      mit^.table[i].dwAdminStatus := MIB_IF_ADMIN_STATUS_DOWN;
      if SetIfEntry(mit^.table[i]) = NO_ERROR then
        Showmessage('Stop Adapter(' + IntToStr(mit^.table[i].dwIndex) + ')'
          + pchar(@mit^.table[i].bDescr[0]) + ' succeed.');
    end;
  FreeMemory(mit);
end;

procedure TFrmMain.Button2Click(Sender: TObject);
var
  dwSize: DWORD;
  mit: PMIB_IFTABLE;
  i: integer;
begin
  //dwSize := 0;
  //mit := nil;
  GetIfTable(nil, dwSize, TRUE);
  mit := GetMemory(dwSize);
  if GetIfTable(mit, dwSize, TRUE) = NO_ERROR then
    for i := 0 to Pred(mit^.dwNumEntries) do
    begin
      mit^.table[i].dwAdminStatus := MIB_IF_ADMIN_STATUS_UP;
      if SetIfEntry(mit^.table[i]) = NO_ERROR then
        Showmessage('Start Adapter(' + IntToStr(mit^.table[i].dwIndex) + ')'
          + pchar(@mit^.table[i].bDescr[0]) + ' succeed.');
    end;
  FreeMemory(mit);
end;

end.