delphi 在做百度分页搜索时候遇到的问题

请教一下 以下这段代码 怎么修改了后搜索不到结果呢？


function TBaiduSearch.SetSearchUrl :string;
const
  BD_PRE = 'http://www.baidu.com/s?rn=';
  BD_MIDH = '&wd=';
  BD_MIDL = '&pn=';
  BD_END = '&usm=2';
  BD_PN = 100;
begin
  Result := BD_PRE + IntToStr(BD_PN) + BD_MIDH + URLEncode(_KEYWORD) + BD_MIDL + IntToStr(_CURR_PAGE*BD_PN) + BD_END;
  //
  _ENGINE := Integer(weBaidu);
  _UTF8 := False;
end;

function TBaiduSearch.AnalyzeLink(inUrl : string; var outUrl :string):boolean;
const
  BD_CRTL = '&url=';
  BD_TAL = '&b=';
  BD_COM = 'http://www.baidu.com/baidu.php?url=';
var
  iPos : Integer;
begin
  iPos := Pos(BD_CRTL,inUrl);
  Result := iPos > 0 ;
  if Result then
  begin
  outUrl := inUrl;
  Delete(outUrl,1,Length(BD_CRTL)+iPos-1);
  iPos := Pos(BD_TAL,outUrl);
  if iPos>0 then outUrl := Copy(outUrl,1,iPos-1);
  outUrl := UrlDecode(outUrl);
  Exit;
  end;
  iPos := Pos(BD_COM,inUrl);
  Result := iPos > 0 ;
  if Result then
  outUrl := inUrl;
end;

到百度抓搜索结果？