Solved

Something like a Pointer

Posted on 2001-06-19
4
155 Views
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

0
Comment
Question by:zzconsumer
  • 2
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 27

Accepted Solution

by:
Ark earned 100 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

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The debugging module of the VB 6 IDE can be accessed by way of the Debug menu item. That menu item can normally be found in the IDE's main menu line as shown in this picture.   There is also a companion Debug Toolbar that looks like the followin…
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
Get people started with the process of using Access VBA to control Excel using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Excel. Using automation, an Access application can laun…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question