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Problems when calling function

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    Problems when calling function

    I have created an application that keeps track of my sales while on the road, basicly it is an specialized invoicing / inventory control situation, similar to the Invoice example application that is shipped with A5; so similar in fact I have used some of the code from it and subbed the names of my forms etc. as reqired.
    The following code is attached to the OnExit action of the MainMenu form (I followed the example in Invoice). All goes well until "OrderMain" is passed to the function Close_if_Exists, then an error message reading "Argument is an incorrect data type" pops up, retry, ignore buttons do not allow script to continue, and if abort is pressed, A5 packs it in totally with the message that "This program has performed an illegal operation and will be shut down"
    The thing that has me stumped is why is it just the one form that causes the proplem?
    Thanks in advance for any help given.

    'Calls global function to close all open forms
    'before restoring control panel.
    close_if_exists("CustomerMain")
    close_if_exists("InventoryMain")
    close_if_exists("OrderMain")
    close_if_exists("TitleMain")

    controlpanel.show()
    controlpanel.activate()

    ''
    '' CLOSE_IF_EXISTS()
    '' Test is an object exists and if so closes it
    ''
    '' Parameters:
    '' name: The name of the object to close
    ''
    function close_if_exists as N(name as C)
    DIM op as P

    ''
    '' Get the object pointer for the specified object
    ''
    op = obj(name)

    ''
    '' If the object pointer is valid then an object was found and we can close it.
    ''
    if is_object(op)
    op.close()
    end if

    end function

    #2
    RE: Problems when calling function

    Don:

    I use close_if_exists without issue.

    May I assume that you have defined close_if_exists as a custom global function as it is not built into the program. Make sure you see it in the xbasic explorer list of global functions.

    If so, make a new table to test with. Create a two simple forms for the table and make a button on one form to close the other form. If you get it to work there go back to your application and look for complications and conflicts.

    If it doesn't work in the test situation, I'm stumped in principle, although in practice it is usually a stupid typo which has brought my code to its knees.

    Bill
    Bill Hanigsberg

    Comment


      #3
      RE: Problems when calling function

      Don, you get "argumnet is incorrect data type" because of this:
      function close_if_exists as N(name as C)

      change this line to:
      function close_if_exists as P(name as C)

      Jake

      Comment


        #4
        RE: Problems when calling function

        Thanks for your suggestion Jake, but it didn't cure the problem.
        Before sending every one off on a wild goose chase I should mention that I am using A5 ver 3.04. Is there a difference between how ver.4 and 3.04 call functions?
        As mentioned, the function works fine with all other forms, and is 'borrowed as is' form the example shipped with A5 other than I changed the names of the forms.
        I is almost like something is corrupted in the data base (I have tried compacting etc.)
        Any other ideas?
        Thanks againg for your help.

        Comment


          #5
          RE: Problems when calling function

          Thanks Bill and Jake for your suggestions.
          Bill was right when he suggested bad syntax / code errors as the root of most problems.
          As it turns out, that was the case here. There a script in 'OnActivate'in OrderMain that is causing the grief (still don't know why, but at least I know where!)

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