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Calc field calling UDF doesn't work

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    Calc field calling UDF doesn't work

    HI Alpha People:

    I have a UDF (userdefined function) that opens a set and then opens one of it's child tables. Then it does it's processing and closes the set and the table.

    If I call this UDF from the code editor, it works just fine.

    The problem is when I call it on a form layout. I created a calculated field on the form that calls the function. When the form loads it tries to display the calculated field, but the function errors saying that it can't close the child table because of invalid file handle.

    I appreciate any help!

    RE: Calc field calling UDF doesn't work

    How about posting the code for the UDF, or a zipped copy of the table with a problem and the database with the UDF. Without the details of the code, it is difficult to determine what is happening.



      RE: Calc field calling UDF doesn't work


      If your UDF is trying to open a set that includes tables that are already open, this might explain what you're seeing.

      Check the Xbasic Ref. Manual on the command. You'll find that you can't use it to open a set if any table in the set is already open. If I recall correctly, when Alpha Five opens a second instance of a table it assigns a new alias name to it, which is different from the alias names used in the set design. The mismatch in names blocks the set from opening.

      -- tom


        RE: Calc field calling UDF doesn't work


        The set IS already open when I call the function from the form.

        So do I just take out the open statement from the function? Will the function recognize it's already open?

        How would I set the table pointer to that open set then?

        Thank you, Victor...


          RE: Calc field calling UDF doesn't work

          Ch. 14 of the Xbasic Ref. Manual is required reading for anyone writing scripts which manipulate tables.

          Table.current(), discussed in Ch. 14, is the typical way I get a pointer to the set upon which my form is based.

          -- tom


            RE: Calc field calling UDF doesn't work

            If you use table.current() and change the record to do your search, you could create problems for yourself because the current form may get "out of synch" with the table.

            Another way is to open one table at a time in your script and do what I'll call a "descending lookup" - find the appropriate value in the parent table, then use that value to find the value in the next child, etc. It really isn't that much work and the results run very fast.

            In extreme cases, you can actually build the same set with XBasic and the Relation commands.

            If you need more info you will need to post your script so we know exactly what you're trying to accomplish.


              RE: Calc field calling UDF doesn't work

              I'll try opening the individual tables and see if I can get it to work. If I get stuck, I'll post the script.

              By the way, I have the Xbasic for Everyone book, but my chapter 14 doesn't mention table.current()

              My book says it is for Alpha Five Version 3. Is there a newer book for version 4?

              Thanks to everyone for helping, you are part of what makes Alpha such a great language to use.



                RE: Calc field calling UDF doesn't work

                Victor, Xbasic for Everyone is a good book, and I depend on it. But the Xbasic Reference Manual, published by Alpha Software, and delivered to you with Alpha Five (look in the Books folder) is what I was referring to.

                -- tom