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Använd IP-adress kontroll
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Kategori: System
Inlagt: 2005-12-28
Läst: 1432
Inlagt av: Staffan Berg
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Beskrivning |
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IE 4 introducerade en s k IP-adresskontroll som försäkrade användaren att skriva in numeriska tal i rätt format. Detta format består av fyra grupper som max får innehålla 3 siffror i varje grupp. Varje grupp behandlas också individuellt. I exemplet nedan kontrolleras IP-adresser enligt detta koncept.
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Kod |
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.
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