[AccessD] Broken References in Runtime AXP

Hi Charlotte

That is of course correct. Users have no patience.

However, it may not be that processor dependant. I've tested it on a
266 MHz machine and the test lasts only for a couple of seconds for
seven assorted references.

But another trick is to run a potentially error raising query and trap
an error. That takes only a split second but will cause a briefly
flash of the open query.
This is an example of how to do that; the in-line comments should be
all you need:

<code>

Public Function CheckReferences( _
  ByVal booErrorDisplay As Boolean) As Boolean

' Try to check - without using DAO or ADO - if a reference is broken by
' running a query with an expression using a "standard" built in function.
' Example of query string using Right():
'   SELECT TOP 1 Id, Date() AS Check FROM MSysObjects;
'
' As the query will flash briefly when opened, resize it to minimum size
' and position it in a corner of the app window before saving it.
'
' Returns True if references were OK or could be validated successfully.
'
' 2001-08-01. Cactus Data ApS. CPH.

  ' Query with expression that may fail.
  Const cstrRefQry    As String = "USysQryReferencesCheck"
  ' Errors to trap.
  ' Error 2001: Query is "too complex".
  Const clngRefError1 As Long = 2001
  ' Error 3075: Function isn't available in expressions in query expression.
  Const clngRefError2 As Long = 3075
  
  Dim lngError        As Long
  Dim booChecked      As Boolean
    
  On Error Resume Next
  
  ' Run the query and record a possible error.
  DoCmd.OpenQuery cstrRefQry, acViewNormal
  ' If error clngError is raised, a reference is missing.
  lngError = Err.Number
  ' Close checking query.
  DoCmd.Close acQuery, cstrRefQry
  
  Select Case lngError
    Case 0
      ' No errors.
      booChecked = True
    Case clngRefError1, clngRefError2
      ' Run the function to fix the references.
      booChecked = VerifyReferences(booErrorDisplay)
    Case Else
      ' Another error occurred.
      ' Return False.
  End Select
  
  CheckReferences = booChecked

End Function

</code>

/gustav


> I tested it and it works but we would have to figure out how to make it
> run just once to fix the reference and then disable it going forward.
> The delay is significant, and I'm running a fast machine, which many of
> our customers aren't.

> Charlotte Foust

> -----Original Message-----
> From: Gustav Brock [mailto:gustav at cactus.dk] 
> Sent: Monday, July 21, 2003 10:50 PM
> To: Access Developers discussion and problem solving
> Subject: Re: [AccessD] Broken References in Runtime AXP


> Hi Charlotte

> Did you try to apply my Function VerifyReferences() - or similar - which
> I posted earlier?

> The problem is that Access believes the references are OK but at least
> one turns out not to be.

> This bug is a bummer and it is unbelievable that MS has allowed it to
> survive since A97 - or probably since A95. 

> It would be nice if someone working with Access 2003 beta could report
> back to MS if the bug still exists. I am, however, fully aware that it
> will take quite some time to test this ...

> /gustav


>> The reference resolves using the RefLibPaths key.  Unfortunately, I'm 
>> still getting a #Name? Error on a control bound to the expression 
>> Format(Date(),"dd-mmm-yyyy").  Any other suggestions.