procedure IterateFrames(const AWB: IWebBrowser2);

var

Doc: IHTMLDocument2;

Container: IOleContainer;

Enumerator: ActiveX.IEnumUnknown;

Unknown: IUnknown;

Browser: IWebBrowser2;

Fetched: Longint;

NewDoc: IHTMLDocument2;

begin

if (Assigned(AWB.Document)) and (Supports(AWB.Document, IHTMLDocument2, Doc)) then

begin

// Recursive searching.

// ACHTUNG! We cannot use the document's frames collection here, because

// it does not work in every case (i.e. Documents from a foreign domain).

// From: support.microsoft.com/support/kb/articles/Q196/3/40.ASP

if (Supports(Doc, IOleContainer, Container)) and (Container.EnumObjects(OLECONTF_EMBEDDINGS, Enumerator) = S_OK) then

begin

while Enumerator.Next(1, Unknown, @Fetched) = S_OK do

if (Supports(Unknown, IWebBrowser2, Browser)) and (Supports(Browser.Document, IHTMLDocument2, NewDoc)) then

begin

//DoSomethingWithNewDoc;

IterateFrames(AWB);

end;

end;

end;

end;

来源：https://www.cnblogs.com/honeynm/p/4653651.html