Essa é complicada (bloquear GetWindowText, DDEClientConv.SetLink

Existem algumas funções em C++  delphi e Visual Basic que possibilitam captar o endereço de url do browser e o titulo da pagina

ex : em Delphi

function TForm1.GetURL(Service: string): String;

var

ClDDE: TDDEClientConv;

temp:PChar;

begin

Result := ‘’;

//create a new DDE Client object

ClDDE:= TDDEClientConv.Create( nil );

with ClDDE do

begin

SetLink(Service,‘WWW_GetWindowInfo’);

temp := RequestData(‘0xFFFFFFFF’);

Result := StrPas(temp);

StrDispose(temp);

CloseLink;

end;

ClDDE.Free;

end;

Title:string;

S: Array[0…255] of Char;

s1:string;

begin

Handle:=GetForegroundWindow;

Len:=GetWindowTextLength(Handle) + 1;

SetLength(Title,Len);

GetWindowText(Handle,PChar(Title),Len);

GetWindowText(GetForeGroundWindow, S, SizeOf(S));

S1 := StrPas(S);