Re: Check if UserForm is loaded?

  • Thread starter Thread starter Peter T
  • Start date Start date
P

Peter T

I know you've worked around but for future reference try something like
this -

Sub UnloadAllForms()
Dim i As Long
For i = UserForms.Count To 1 Step -1
Unload UserForms(i - 1)
Next

End Sub

If a particular form is loaded you might want to run any clean up code
before unloading the form.

Regards,
Peter T
 
Charlotte E said:
Thanks, Peter, but once again: The Unload statement actually loads the
userform first before unloading it, if the userform is not loaded upon
calling the unload-statement, thus your solution cannot be used, since it
is important not to load the userform, because this sets off a chain of
event, which is not wanted when unloading it.
Click to expand...

No, the example I posted only unloads Forms that are already loaded. If no
Forms are loaded UserForms.Count will be zero, so the loop will not even
start.
But, I really find it a lack of effencicy that that the unload statement
actually loads the userform first!!!
Click to expand...

Whenever you attempt to reference a Form it will load if it is not alrady
loaded. It's not a question of efficiency or lack of it.

Regards,
Peter T
 
Whenever you attempt to reference a Form it will load if it is not alrady
loaded. It's not a question of efficiency or lack of it.
Click to expand...

As you can see by my previous post, I've gotten used to using
Load/Unload events with forms since using COM and VB6. As Dave aptly
points out, the Initialize event fires whenever a form is referenced.
In VB6, the Load event doesn't fire unless you execute it in code.

Either way, being a Rob Bovey student I've grown accustomed to using
object variables when creating instances of a form/userform because
that's what's exampled in most his books. Referencing the variable has
different behavior than referencing a VBA userform directly is the
lesson I've learned from Dave's suggestion. The problem lies where
there's code in the Initialize event, which I rarely use in VB6
projects.

Just another interesting difference between VB6 and VBA...
<g>
 
There are several differences with VB6 forms, however any attempt to
reference a VB6 Form also loads the form into memory, even say Unload Form1
as with VBA. Also, perhaps counter intuitively, the Unload statement does
not fully Unload the VB6 form.

If you are not using a variable you might want to do say -

Unload Form1 ' to fire the QueryUnload event
Set Form1 = Nothing ' trigger the Terminate event

Regards,
Peter T
 
There are several differences with VB6 forms, however any attempt to
reference a VB6 Form also loads the form into memory, even say Unload Form1
as with VBA. Also, perhaps counter intuitively, the Unload statement does not
fully Unload the VB6 form.

If you are not using a variable you might want to do say -

Unload Form1 ' to fire the QueryUnload event
Set Form1 = Nothing ' trigger the Terminate event
Click to expand...
I agree with your concept; -setting 'myFormVar = Nothing' is standard
cleanup for me. What I was trying to emphasize is that the Initialize
event fires whenever a form/userform is referenced, and so using code
in that event is where the problem lies in this OP's case. Looking back
at some old VBA code before using an object var to hold an instance of
a userform, I was using my own 'Initialize' procedure rather than the
event, wherein I loaded a userform, did whatever setup tasks I needed
to do, then used Show to display it. Therefore, whenever I used the
following code to query the userform I never had any problems because
the Initialize event was never used.<g>

If Not Userform1 Is Nothing Then Unload Userform1
 
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