Question

Calling Subs in a class module from bas module in same project

Asked by: topino

hello everyone,

I need to be able to call a sub which is located in a class module from a bas module in the same project. I cannot put the code that is supposed to call this sub in the class module as it's a ddecallback and must be in a bas module in order to work with addressof operator.

thanks in advance for your help


FT

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Asked On
2003-01-12 at 10:16:57ID20453501
Topic

Visual Basic Programming

Participating Experts
3
Points
30
Comments
5

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Answers

 

by: aikimarkPosted on 2003-01-12 at 10:28:55ID: 7712396

if the class has been instantiated (Dim X As New classname), then you invoke the routine as X.routinename.
 

 

by: topinoPosted on 2003-01-12 at 10:47:00ID: 7712433

I did as you suggested and I am not getting the compile error anymore. thanks!! however, I will have to test it tomorrow live as it is a stock market application. I put Dim X as new classname in my bas module.  how would I destroy X after I don't need it anymore? the sub I am trying to call has to send an event back to my client application, that's why I have to put it in the my class module. is there a way to leave it in the bas module and raise and event from there??

thanks again

 

by: aikimarkPosted on 2003-01-12 at 11:57:57ID: 7712682

X should be destroyed when the subroutine ends.
You can force X to go away with:
X = nothing

If X is a module-level variable, it will stay around indefinitely.

 

by: twalgravePosted on 2003-01-12 at 13:07:10ID: 7713005

That should be Set x = nothing.
No you can't leave the declaration in a BAS module and raise an event or respond to events from there (well you could raise one indirectly by exposing a property on the class that would trigger an event, but that's not what you want I suspect).  You cannot declare a variable as withevents in a BAS module so therefore you cannot respond to the events in a BAS module.  It has to be in another class (a form is considered a class too).

 

by: ArkPosted on 2003-01-13 at 16:54:39ID: 7721726

Hi

' *.bas module:

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (lpDest As Any, lpSource As Any, ByVal cBytes&)

Public ClsPtr As Long

Private Function ResolvePointer(ByVal lpObj&) As cMyClass
  Dim oCls As cMyClass
  CopyMemory oCls, lpObj, 4&
  Set ResolvePointer = oCls
  CopyMemory oCls, 0&, 4&
End Function

Public Function MyCallBack(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
'......your code
  ResolvePointer(ClsPtr).MyFunction Param1, Param2
'......rest of your code
End Function

'====Class code====
Private Sub Class_Initialize()
  ClsPtr = ObjPtr(Me)
End Sub

Friend Function MyFunction(ByVal prm1 as Long, ByVal prm2 as Long)
   'your code here
End Function

Regards
Ark

20120131-EE-VQP-002

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