> >The DLL file is in the fbserver.exe directory.
>
> It should be in the ..\UDF directory.

Thanks.

Where can I find a good documentation for Firebird UDF - with Delphi?

For example I would like to return a boolean value, but I didn't find out, how to declare the UDF in this case? I would like to use it like this:

select * from TESTDATA where MYFUNC(FIELD1, FIELD2)

instead of

select * from TESTDATA where MYFUNC(FIELD1, FIELD2) <> 0

cu Christian