Searching comments

Hello,

I am using Acrobat Search plugin HFT functions to search text in the PDF document.

Along with regular text, I also want to search the comments.

In the Edit->Advanced Search panel, there is a option to include the comments in the Search.

I just want to do it programmatically.

Here is my code snippet:

ASText searchKey = ASTextNew();
searchKey = ASTextFromEncoded(searchText, kUTF8);
SearchQueryDataRec srcQuery;
memset(&srcQuery, 0, sizeof (SearchQueryDataRec));
srcQuery.size = sizeof(SearchQueryDataRec);
srcQuery.query = searchKey;
srcQuery.type = kSearchActiveDoc;
srcQuery.scope = kSearchDocumentText | kSearchEveryWhere;
srcQuery.path = NULL;
srcQuery.fs = NULL;
srcQuery.maxDocs = 1;
ASBool ret = SearchExecuteQueryEx(&srcQuery);

As you can see, I used srcQuery.scope = kSearchDocumentText | kSearchEveryWhere;

But I am not able to search through comments. But sometimes it gives me an  error like "There was an error retrieving text".

What is it that I am missing here?

Thanks