> is there any documentation how to implement blob filters with Delphi?
> "The Firebird Book" only refers to the InterBase Documentation, and this
> is only aimed at C developers. A search on firebird.sql and
> ibphoenix.com doesn't seem to provide any information on this.
>
> Well, perhaps I would be able to "translate" the C examples for me, but
> as the whole topic of blob UDFs is still somewhat confusing to me, I
> fear I won't be able to get it right.

Before you start developpinfg your blob filters, be aware that
they can't be invoked
- in sql command
- in UDF
- in PSQL

The only way how to invoke blob filter is using BPB (blob parameter
block), i.e. either using embedded sql precompiler, or using Firebird API,
or using connection library that uses Firebird API.

Ivan
http://www.volny.cz/iprenosil/interbase/