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Something like a Pointer

Posted on 2001-06-19
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Last Modified: 2010-05-02
Hello,

I need something like a pointer to tell a class module where to get its data from. Is there such a possibility in Visual Basic?

Gretting
zz

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Question by:zzconsumer
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4 Comments
 
LVL 22

Expert Comment

by:CJ_S
ID: 6205550
ByRef

in your class module you make a function like

public function myFunction(ByRef myData as string)
   msgbox myData
   myData = "Newstring"
end function

now you just pass the reference like

Dim str as string
str = "test"
call objectreference.myFunction(str)
msgbox str

Regards,
CJ
0
 
LVL 28

Accepted Solution

by:
Ark earned 300 total points
ID: 6205639
Hi

At ClassModule_Initialize event:

  MyClassPointer = ObjPtr(Me)

At bas module:

Public MyClassPointer As Long

Public Function ResolvePointer(ByVal lpObj&) As MyClass
  Dim oMC As MyClass
  CopyMemory oMC, lpObj, 4&
  Set ResolvePointer = oMC
  CopyMemory oMC, 0&, 4&
End Function

Now any time you want access any of your class properties or methods, just call:

Call ResolvePointer(MyClassPointer).MyMethod(params)
Or ResolvePointer(MyClassPointer).MyProperty = NewProperty

Cheers
0
 
LVL 1

Author Comment

by:zzconsumer
ID: 6205682
Can i also tell the class which Property of a known class to allocate? The thing is that I made a class that returns arrays using different Properties as Variant.
0
 
LVL 1

Author Comment

by:zzconsumer
ID: 6230438
Well, I had not time to check it out, but Ark's solution looks like it comes closest to what I need.

Thanks.
zz
0

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