> > From the first procedure like PRINT/INPUT or BGET/BPUT encountered in > > the filter? OK I see the problem now. Impossible to implement because > > such procedure can be user defined. > > And, especially, the EX command is invoked BEFORE your filter starts > executing (after all the EX command does the executing), so it has no > way of knowing what you do in your filter... > > The only way raound it is some form of basic procedure as given in my > earlier message. I don't wish to get directly involved with this as I don't know enough on the subject, but Filters (and the ease with which they may be written in SBASIC) sounds like a subject we ought to be covering in QL Today and Quanta newsletter. Anyone fancy writing a short piece on the subject?
You may remember a brief discussion on 'WHEN variable' structures a few weeks ago on this list - we will have a short article on this rarely used feature of QDOS in a forthcoming QL Today, a useful little spin-off from subjects discussed almost in passing here! -- Dilwyn Jones
