{
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
}
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;
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.ClearIPClick(Sender: TObject);
begin
SendMessage(HIPAddress, IPM_CLEARADDRESS, 0, 0);
end;
end.
Статья Как использовать IP Address Control у себя? раздела Компоненты и Классы Создание компонент может быть полезна для разработчиков на Delphi и FreePascal.
