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Tip of the Day
Language: VB5,VB6
Expertise: Intermediate
Dec 4, 1999

Use Objptr function to quickly locate an object in a Collection

One of the simplest and most effective uses of the ObjPtr function is to provide a key for quickly locating an object in a Collection. Let's suppose you have a collection of objects that don't have a property that can be used as a key to retrieve them in a collection. You can work around this by using the value returned by the ObjPtr function as the key in the collection:

Dim col As New Collection
Dim obj As CPerson

' create a new CPerson object and add it to the collection
Set obj = New CPerson
obj.Name = "John Smith"
col.Add obj, CStr(ObjPtr(obj))  'the key must be a string
Because any object has a distinct ObjPtr value, and this value is guaranteed immutable, it is very easily to quickly retrieve it in the collection:

' remove the object from the collection
col.Remove CStr(ObjPtr(obj))
The same trick can be applied to any type of objects, including VB forms and controls, and external objects.
Francesco Balena
 
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