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

eval_valid(session.myVar) randomly fails during multi a5w page login under AA IIS

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

    eval_valid(session.myVar) randomly fails during multi a5w page login under AA IIS

    Myself and two other users have observed eval_valid("session.MyVar") return .F. during a multi-page login process for a session variable that has already been created on a previous a5w page.

    I have Alpha's Login component configured to call an "intermediate" login page (Page_B) that sets some session variables using something like "session.myVar = some_xbasic_variable". That intermediate page calls a page (Page_C) that hosts a Grid. When the user clicks a button on a Grid row, an ajax callback is made. That callback has something like this at the top:

    Code:
    '-- Validations
    select
        case eval_valid("session.myVar") = .f.
            mRetMsg = "Error 1, blah, blah, blah"
        case eval_valid("session.myVar2") = .f.
            mRetMsg = "Error 2, blah, blah, blah"
        case ..... '-- other validations
        case else
            '-- all okay.  Set remaining session variables
    end select
    '--- If validation error then return an alert message
    '--- Else  return "location.href = apps_main_page.a5w"
    On rare occasion the grid displays the "Error 1..." when the user clicks the button for the callback.

    Why would it be that sometimes the AA web server under IIS forgets a session variable or thinks"eval_valid("session.myVar") is .F. ?

    When this happened to me this morning, I checked all the error logs and could find nothing, except the "favicon" link in the login page was missing a "?" between the icon name and the random number argument. This was triggering an error in the event log about the bad URL path. But that occurred 3 minutes before I clicked the button on Page C.

    Since discovering the above error, I have changed "eval_valid" to "variable_exists" and I have altered the code to guarantee the variables are indeed being set to CHAR types. The db fields are UNIQUEIDENTIFIER types in MS SQL and they appear as type CHAR when using "rs.data("myColumn") from a resultset on localhost. But to be sure there is no problem between the two types, I put a CONVERT(varchar(40), myColumn) on each of the GUID columns.

    Build 5303 (Dev and server)
    Session state is being held in ASP.NET SQL Provider
    There is no config for session timeout on the publishing profile - I do not see any type of config option in profile.

    #2
    Re: eval_valid(session.myVar) randomly fails during multi a5w page login under AA IIS

    So, a couple days later now, after making absolutely sure the UNIQUEIDENTIFIER column from SQL is being returned and used as CHAR in xbasic, I am now noticing a problem with a different session variable - a session variable that gets set later on in my multi-page login process. I have started a different thread about it here:
    https://forum.alphasoftware.com/show...S-(build-5303)

    Comment


      #3
      Re: eval_valid(session.myVar) randomly fails during multi a5w page login under AA IIS

      I may have discovered the cause for the random failure: Sometimes Alpha WAS and Alpha IIS calls your "Redirect Page - Login" even when the user is logged in, the user won't see that page, but if that page has code to delete session variables then they will probably vanish on you. I posted my findings here: https://forum.alphasoftware.com/show...ample-attached

      Oh, but as pointed out in someone else's post, session variables may always be susceptible to timing issues on the server. I think this is especially true if session variables are being held in a SQL database on a separate server from the web server! Totally defeats the purpose of having session variables held in SQL if they cannot be read back by the time the person posts another request to the server.

      Comment

      Working...
      X