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begin //wlan on
ShellExecute(Application.Handle, nil, 'netsh',
'wlan delete filter permission=denyall networktype=infrastructure', nil, SW_HIDE);
end;
.
begin //wlan off
ShellExecute(Application.Handle, nil, 'netsh',
'wlan add filter permission=denyall networktype=infrastructure', nil, SW_HIDE);
end;					

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unit U_Main;

interface

uses
  Forms, ComObj, Windows, ShellApi, Messages, SysUtils, StrUtils, Variants, Classes,
  Graphics, Controls, Dialogs, Registry, Math, ActiveX, SHDocVw, StdCtrls;

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

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
//Enable a NIC
const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM Win32_NetworkAdapter Where NetEnabled=False','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    FWbemObject.Enable();
    FWbemObject:=Unassigned;
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
//Disable a NIC
const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM Win32_NetworkAdapter Where NetEnabled=True','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    FWbemObject.Disable();
    FWbemObject:=Unassigned;
  end;
end;

end.