Accessing the objects within an IFrame

I need to be able to access the elements in an IFrame to read the values and write them.
I have code to do this within Pages and Frames where I have previously dealt with the All property of the IHTMLDocument(s) which is an IHTMLCollection. The All property of the HTMLIFrame and the IHTMLElement is an IDespatch.

I would welcome any advice dealing with this property, for example what collection type does it actually return? I have checked for IHTMLDocument2 and IHTMLElementCollection and the IFrame doees not appear to support them.

Are there any Gotchas?

How can I get from the IDespatch to the equivalent of the document or HTMLCollection object (if there is one) that one gets from iterating through the enumerator of the OleContainer for a standard Frame.

My current code for dealing with pages and frames and the test code I have written for IFrames is below.

The background to this work is that we write Speech Recognition Software. A lot of ouir users are hospital departments and assiting disabled people to retain their jobs. This means providing workflows which they can drive by voice, filling in our voice activated dialogs by voice and our workflow software then puts the data into the relevant field. A lot of the applications they use are delivered through browsers with the pages generated by 3/4th generation development systems. Quite a lot of these use IFrames.
Our own website uses Joomla as a Content Management System and the Editors for that are delivered in IFrames.

Code now used to find the Frames and the associatied document NewDoc (IHTMLDocument2)
This was from an answer to a previous question and works well.
       if (Supports(CurrDoc, IOleContainer, Container)) and
         (Container.EnumObjects(OLECONTF_EMBEDDINGS, Enumerator) = S_OK)
      then begin
            while Enumerator.Next(1, Unknown, @Fetched) = S_OK do
            begin
            Inc(FrameNo);
             if (Supports(Unknown, IWebBrowser2, Browser)) and
                (Supports(Browser.Document, IHTMLDocument2, NewDoc))
 
Test code trying to find a Document (IHTMLDocument2) interface in the IFrame
    if Supports(CurrItem, HTMLIFrame, fIFrame)
  then begin
        edtTag.Text := 'Got IFrame';
        if Supports(fIFrame, IHTMLFrameBase, fFrameBase)
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'FB';     //This is Supported
        if Supports(fIFrame, IHTMLFrameBase2, fFrameBase2)
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'FB2';    //This is Supported
        if Supports(fIFrame, IHTMLFrameBase3, fFrameBase3)
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'FB3';     //This is Supported
        if (Supports(fIFrame, IHTMLElementCollection, TestColl))
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'Col';     //This is not Supported
        if (Supports(fIFrame, IOleContainer, TestCont))
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'Cnt';     //This is not Supported
        if (Supports(fIFrame, IHTMLDocument2, TestDoc))
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'Doc1';      //This is not Supported
        if (Supports(fIFrame, IWebBrowser2, TestBrowse))
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'Brow';    //This is Supported
        if (Supports(TestBrowse, IHTMLDocument2, TestDoc))
        then WrkStr := ' +'
        else WrkStr := ' -';
        EdtTag.Text := EdtTag.Text+WrkStr+'Doc2';
        end
  else edtTag.Text := 'NOT got IFrame';

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GHG-RCHAsked:
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Mechanic_KharkovConnect With a Mentor Commented:
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GHG-RCHAuthor Commented:
Thank you for this reference, it gave me enough to proceed. On this bais I have closed the question, though I have used the second suggested approach and wish to try the first one also.
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