Dynamically calling functions of a ActiveX Dll

Posted on 2003-03-13
Medium Priority
Last Modified: 2010-05-01
I have dll's I want to use dynamically.

dim strMyDll as string
strmydll = "Object1.Class1"

I can create a object eg
set oMyObj = createobject(strMyDll)

but how can I do something like this
dim strMyFunction = "Multiply"
debug.print oMyObj.strMyFunction(2,2)  <-- instead of oMyObj.Multilply ???


public Multiply(lngA as long,lngB as long) as long
    Multiply = lngA*lngB
end function

Thanks a lot in advance
Question by:MrQwerty
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LVL 70

Accepted Solution

Éric Moreau earned 460 total points
ID: 8126978
see CallByName in the VB help.

Author Comment

ID: 8127006
Thanks,  I've spend an hour looking in msdn but its rubbish to stuff like this.  I knew it was possible.  Do you want the points?
LVL 70

Expert Comment

by:Éric Moreau
ID: 8127061
It is possible. See this small test:

In class1:

Public Sub P1()
    MsgBox "P1"
End Sub

Public Function F1(ByVal P1 As Integer, ByVal p2 As Integer) As Integer
    MsgBox "F1"
    F1 = P1 + p2
End Function

In Form1:

Private Sub Command1_Click()
Dim x As New Class1

    CallByName x, "P1", VbMethod
End Sub

Private Sub Command2_Click()
Dim x As New Class1

    MsgBox CallByName(x, "F1", VbMethod, 2, 2)
End Sub
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LVL 43

Expert Comment

ID: 8127071
Hi MrQwerty,

Use this instead:

Debug.Print CallByName(oMyObj,strMyFunction,Array(2,2),vbMethod)

Where Array(2,2) is an array of arguments to the function. You could create this variant array first with your arguments of course and simply pass the array in that parameter.


Brainbench MVP for Visual Basic

Experts-Exchange Advisory Board Member
LVL 43

Expert Comment

ID: 8127072
Too slow again!

Author Comment

ID: 8127575
Thanks,  I've spend an hour looking in msdn but its rubbish to stuff like this.  I knew it was possible.  Do you want the points?

Expert Comment

ID: 8127640
try to use API CallWindowProc or something like that

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