如何获取本地html文件的标题

本文用于提取本地网页的标签元素如<TITLE></TITLE>,<IMG>,<A></A>...的内容，非常实用于批量文件的操作，这是按一般文件进行文本查找替换无法比拟的，,而这是使用TWEBBROWSER控件无法做到的。类似的，
你可以把本地的HTML文件转换成MHT文件（这是个大家觉得很棘手的问题，本人已经搞定)。

//uses activex,mshtml

function Html_GetTitleFromFile(const HtmlFile:TFileName;var FileTitle:String):Boolean;
var
Idoc     : IHtmlDocument2;
//ElementGroup : IhtmlElementCollection;
//HtmlItem: IHTMLElement;
PersistFile: IPersistFile;
begin
Result:=False;
if not fileexists(HtmlFile) then
exit;
  FileTitle:=;

  try
       Idoc := CreateComObject(Class_HTMLDOcument) as IHTMLDocument2;
       PersistFile := IDoc as IPersistFile;
       if PersistFile.Load(StringToOleStr(HTMLFile),1)<>S_OK then
       exit;
       IDoc.designMode := on;  //This will disable script execution.
    {   while IDoc.readyState <> complete do  //if it dead here,how to do it?
       begin
       application.ProcessMessages;
       end;
    }
    //   Showmessage(IDoc.readyState);
       Application.ProcessMessages;
       sleep(1000);
    //   Showmessage(IDoc.readyState);
       if IDoc.readyState<>complete then
       begin
       Application.ProcessMessages;
       sleep(1000);
       end;
       if IDoc.readyState<>complete then
       begin
       IDoc:=nil;
       Result:=False;
       exit;
       end;
        Result:=True;
       FileTitle:=IDoc.title;
       {  //This code also works
       ElementGroup:=IDoc.all.tags(TITLE) As IhtmlElementCollection;
       HtmlItem:=ElementGroup.item(0,0) As IHtmlElement;
       FileTitle:=HtmlItem.innerText;
       }

   finally
        IDoc := nil;
   end;
end;