use the IP Address Control in a Form ?

{

 Microsoft ® Internet Explorer Version 4.0 introduces the IP address control,

 a new control similar to an edit control that allows the user to enter a

 numeric address in Internet protocol (IP) format.

 This format consists of four three-digit fields.

 Each field is treated individually; the field numbers are zero-based and

 proceed from left to right as shown in this figure.

 Further informations

 http://msdn.microsoft.com/library/en-us/shellcc/platform/commctls/ipaddress/ipaddress.asp

}

unit Unit1;

interface

uses

 Windows, Messages, Classes, Forms, Controls, StdCtrls, ExtCtrls;

type

 TForm1 = class(TForm)

   IPAddress: TBevel;

   SetIP: TButton;

   ClearIP: TButton;

   procedure FormCreate(Sender: TObject);

   procedure SetIPClick(Sender: TObject);

   procedure ClearIPClick(Sender: TObject);

 private

   FIPAddress: Longint;

   HIPAddress: HWND;

   PrevWndProc: TWndMethod;

   procedure NewWindowProc(var Message: TMessage);

 public

 end;

var

 Form1: TForm1;

implementation

{$R *.dfm}

uses

 CommCtrl;

const

 IP_ADDRESS_ID: Longword = $0100;

procedure TForm1.FormCreate(Sender: TObject);

var

 lpInitCtrls: TInitCommonControlsEx;

begin

 lpInitCtrls.dwSize := SizeOf(TInitCommonControlsEx);

 lpInitCtrls.dwICC  := ICC_INTERNET_CLASSES;

 if InitCommonControlsEx(lpInitCtrls) then  

 begin

   PrevWndProc := WindowProc;

   WindowProc  := NewWindowProc;

   HIPAddress := CreateWindowEx(WS_EX_LEFT, WC_IPADDRESS, nil,

     WS_CHILD + WS_VISIBLE + WS_BORDER + WS_TABSTOP,

     IPAddress.Left, IPAddress.Top, IPAddress.Width, IPAddress.Height,

     Handle, IP_ADDRESS_ID, HInstance, nil);

   SendMessage(HIPAddress, IPM_SETFOCUS, 0, 0);

 end;

end;

procedure TForm1.NewWindowProc(var Message: TMessage);

var

 nField: longint;

begin

 case Message.Msg of

   WM_NOTIFY:  

     begin

       if PNMHDR(Ptr(Message.lParam)).idFrom = IP_ADDRESS_ID then  

       begin

         case PNMIPAddress(ptr(Message.lParam)).hdr.code of

           IPN_FIELDCHANGED:  

             begin

               if SendMessage(HIPAddress, IPM_ISBLANK, 0, 0) = 0 then

                 SendMessage(HIPAddress, IPM_GETADDRESS, 0, lParam(LPDWORD(@FIPAddress)));

             end;

         end;

       end;

     end;

   WM_COMMAND:  

     begin

       if Message.WParamLo = IP_ADDRESS_ID then

         case Message.WParamHi of

           EN_SETFOCUS:  

             begin

               nField := SendMessage(HIPAddress, IPM_GETADDRESS, 0,

                 lParam(LPDWORD(@FIPAddress)));

               if nField = 4 then nField := 0;

               SendMessage(HIPAddress, IPM_SETFOCUS, wParam(nField), 0);

             end;

           EN_KILLFOCUS:  

             begin

               if SendMessage(HIPAddress, IPM_ISBLANK, 0, 0) = 0 then

                 SendMessage(HIPAddress, IPM_GETADDRESS, 0, lParam(LPDWORD(@FIPAddress)));

             end;

           EN_CHANGE:  

             begin

             end;

         end;

     end;

 end;

 if Assigned(PrevWndProc) then PrevWndproc(Message);

end;

procedure TForm1.SetIPClick(Sender: TObject);

begin

 FIPAddress := MAKEIPADDRESS(127, 0, 0, 1);

 SendMessage(HIPAddress, IPM_SETADDRESS, 0, lParam(DWORD(FIPAddress)));

end;

procedure TForm1.ClearIPClick(Sender: TObject);

begin

 SendMessage(HIPAddress, IPM_CLEARADDRESS, 0, 0);

end;

end.