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dtSearch Text Retrieval Engine Programmer's Reference
ISearchFilter::SelectItemsBySearch Method
HRESULT SelectItemsBySearch([in] LONG iIndex, [in] BSTR searchRequest, [in] VARIANT_BOOL bSelected, [out,retval] LONG* pCount);

the number of documents that matched the search, or a negative value if the search failed.

Set the selection state of all documents in an index that match search request.

You can also use SearchJob.WantResultsAsFilter to create a SearchFilter from the results of a search. Using SearchJob.WantResultsAsFilter is more flexible than SelectItemsBySearch because you can use any of the properties of the SearchJob (search flags, FileConditions, etc.) rather than just a simple search request

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