Connaitre les URL des frames dans un TWebbrowser

procedure TForm1.Button2Click(Sender: TObject);
var
i:Integer;
begin
Listbox1.Clear;
file:// if frames available
if Webbrowser1.OleObject.Document.Frames.Length <> 0 then
begin
file://walk through all frames and get the url
file://to the Listbox
for i:=0 to Webbrowser1.OleObject.Document.Frames.Length -1 do
begin
Listbox1.Items.Add(Webbrowser1.OleObject.Document.Frames.item(i).Document.URL);
end;
end;
end;