Jagar
asked on
Question about "Nothing"
Like the title actually I'm referring to the keyword Nothing
I have a loop the goes through a bunch of object when it has finished with all the object the object will be set to Nothing what I need is a loop that checks this object at the end of the loop and continues to process until it becomes nothing, ie.
do
proccesing
loop while not IsNothing(MyVariable)
IsNothing is not a real function unfortunately and I can do something not MyVariable = Nothing. So how do I do something like the about
I have a loop the goes through a bunch of object when it has finished with all the object the object will be set to Nothing what I need is a loop that checks this object at the end of the loop and continues to process until it becomes nothing, ie.
do
proccesing
loop while not IsNothing(MyVariable)
IsNothing is not a real function unfortunately and I can do something not MyVariable = Nothing. So how do I do something like the about
So, create a function 'IsNothing':
Public Function IsNothing(objTarget As Object) As Boolean
Dim sText As String
On Error Resume Next
sText = objTarget.Name
If Err.Number = 91 Then
IsNothing = False
Else
IsNothing = True
End If
End Function
Public Function IsNothing(objTarget As Object) As Boolean
Dim sText As String
On Error Resume Next
sText = objTarget.Name
If Err.Number = 91 Then
IsNothing = False
Else
IsNothing = True
End If
End Function
ASKER
No in the process I control the flow through the object. It is not necessarily from beginning to end. It can move forward and back sides. Skip this or that depending on user interaction with the flow.
So I can just iterate through each element.
So I can just iterate through each element.
What about the Is operator?
do
...
Set MyVariable = Nothing
...
loop while not (MyVariable Is Nothing)
do
...
Set MyVariable = Nothing
...
loop while not (MyVariable Is Nothing)
ASKER
Thanks Cliff that's kinda the work around that I have been using. But did it in the processing because it would give an error when it tried to do the processing on the nothing object.
I was hoping that there would be some function or something that I overlooked.
Well I guess not, so resubmit as an answer and I'll give you the points.
I was hoping that there would be some function or something that I overlooked.
Well I guess not, so resubmit as an answer and I'll give you the points.
bernfarr:
Why didn't you submit that as an answer!
Why didn't you submit that as an answer!
Before I submit, check out bernfarr's answer. If you were to code:
do
proccesing
loop while not (MyVariable Is Nothing)
it should work as you want.
do
proccesing
loop while not (MyVariable Is Nothing)
it should work as you want.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
Thanks that's what I was looking for. It's amazing some of the things you forget about.
Thanks Cliff for your help.
Thanks Cliff for your help.
That and the things you just don't think about. I hate writing code that relies on an error. Thanks bernfarr!
Private Sub Command1_Click()
Dim Found, MyObject, MyCollection
Found = False ' Initialize variable.
For Each MyObject In MyCollection ' Iterate through each element.
Set MyObject = Nothing
Next
End Sub