Alpha Software Mobile Development Tools:   Alpha Anywhere    |   Alpha TransForm subscribe to our YouTube Channel  Follow Us on LinkedIn  Follow Us on Twitter  Follow Us on Facebook

Announcement

Collapse

The Alpha Software Forum Participation Guidelines

The Alpha Software Forum is a free forum created for Alpha Software Developer Community to ask for help, exchange ideas, and share solutions. Alpha Software strives to create an environment where all members of the community can feel safe to participate. In order to ensure the Alpha Software Forum is a place where all feel welcome, forum participants are expected to behave as follows:
  • Be professional in your conduct
  • Be kind to others
  • Be constructive when giving feedback
  • Be open to new ideas and suggestions
  • Stay on topic


Be sure all comments and threads you post are respectful. Posts that contain any of the following content will be considered a violation of your agreement as a member of the Alpha Software Forum Community and will be moderated:
  • Spam.
  • Vulgar language.
  • Quotes from private conversations without permission, including pricing and other sales related discussions.
  • Personal attacks, insults, or subtle put-downs.
  • Harassment, bullying, threatening, mocking, shaming, or deriding anyone.
  • Sexist, racist, homophobic, transphobic, ableist, or otherwise discriminatory jokes and language.
  • Sexually explicit or violent material, links, or language.
  • Pirated, hacked, or copyright-infringing material.
  • Encouraging of others to engage in the above behaviors.


If a thread or post is found to contain any of the content outlined above, a moderator may choose to take one of the following actions:
  • Remove the Post or Thread - the content is removed from the forum.
  • Place the User in Moderation - all posts and new threads must be approved by a moderator before they are posted.
  • Temporarily Ban the User - user is banned from forum for a period of time.
  • Permanently Ban the User - user is permanently banned from the forum.


Moderators may also rename posts and threads if they are too generic or do not property reflect the content.

Moderators may move threads if they have been posted in the incorrect forum.

Threads/Posts questioning specific moderator decisions or actions (such as "why was a user banned?") are not allowed and will be removed.

The owners of Alpha Software Corporation (Forum Owner) reserve the right to remove, edit, move, or close any thread for any reason; or ban any forum member without notice, reason, or explanation.

Community members are encouraged to click the "Report Post" icon in the lower left of a given post if they feel the post is in violation of the rules. This will alert the Moderators to take a look.

Alpha Software Corporation may amend the guidelines from time to time and may also vary the procedures it sets out where appropriate in a particular case. Your agreement to comply with the guidelines will be deemed agreement to any changes to it.



Bonus TIPS for Successful Posting

Try a Search First
It is highly recommended that a Search be done on your topic before posting, as many questions have been answered in prior posts. As with any search engine, the shorter the search term, the more "hits" will be returned, but the more specific the search term is, the greater the relevance of those "hits". Searching for "table" might well return every message on the board while "tablesum" would greatly restrict the number of messages returned.

When you do post
First, make sure you are posting your question in the correct forum. For example, if you post an issue regarding Desktop applications on the Mobile & Browser Applications board , not only will your question not be seen by the appropriate audience, it may also be removed or relocated.

The more detail you provide about your problem or question, the more likely someone is to understand your request and be able to help. A sample database with a minimum of records (and its support files, zipped together) will make it much easier to diagnose issues with your application. Screen shots of error messages are especially helpful.

When explaining how to reproduce your problem, please be as detailed as possible. Describe every step, click-by-click and keypress-by-keypress. Otherwise when others try to duplicate your problem, they may do something slightly different and end up with different results.

A note about attachments
You may only attach one file to each message. Attachment file size is limited to 2MB. If you need to include several files, you may do so by zipping them into a single archive.

If you forgot to attach your files to your post, please do NOT create a new thread. Instead, reply to your original message and attach the file there.

When attaching screen shots, it is best to attach an image file (.BMP, .JPG, .GIF, .PNG, etc.) or a zip file of several images, as opposed to a Word document containing the screen shots. Because Word documents are prone to viruses, many message board users will not open your Word file, therefore limiting their ability to help you.

Similarly, if you are uploading a zipped archive, you should simply create a .ZIP file and not a self-extracting .EXE as many users will not run your EXE file.
See more
See less

Calc field calling UDF doesn't work

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    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!
    Victor...

    #2
    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.

    Jerry

    Comment


      #3
      RE: Calc field calling UDF doesn't work

      Victor,

      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 table.open() 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

      Comment


        #4
        RE: Calc field calling UDF doesn't work

        Tom:

        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...

        Comment


          #5
          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

          Comment


            #6
            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.

            Comment


              #7
              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.

              Victor..

              Comment


                #8
                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

                Comment

                Working...
                X