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ActiveX DLL Help required

Posted on 2006-10-24
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Last Modified: 2011-10-03
HI

I am a beginner to ActiveX DLL development.  I want to create an Active DLL in VB, with various functions that I can call from within my VB EXE application.  Does anyone know of any good online examples that I can use to learn how to achieve this, or could someone post some examples of:

a) A simple DLL with 2 functions that can be called
b) Sample code of how to reference my ActiveX DLL from within my VB application, and how to make these calls, including passing values to it.

I know if I had a good example I could work out the rest of it myself.
Many Thanks
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Question by:icontroldev
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jmundsack earned 50 total points
ID: 17794961
1. Create a new ActiveX DLL project (this auto-creates Class1)
2. Add the following code to Class1

Option Explicit

Private mMyProperty As String

' example of property get/let
Public Property Get MyProperty() As String
    MyProperty = mMyProperty
End Property
Public Property Let MyProperty(ByVal NewValue As String)
    mMyProperty = NewValue
End Property

' example of public procedure
Public Sub DoSomething()
    ' code to do something
End Sub

' example of public function
Public Function GetSomething() As String
    'GetSomething = <something to get>
End Function

3. Give your Class and Project some names (e.g., SomeProject, SomeClass)
4. Compile the DLL (see also * below)
5. Open another VB project
6. Go to Project > References
7. Find SomeProject in the list and check the box
8. Add the following code to this project:

    Dim objSomeClass As SomeClass
    Set objSomeClass = New SomeClass
    objSomeClass.MyProperty = "Hello, World!"
    MsgBox objSomeClass.MyProperty

This should get you started....

* Before you get too deep in ActiveX, read up on the topic of "binary compatibility".  Here is an excellent article on the topic:   http://users.skynet.be/wvdd2/Compiling/compiling.html

HTH-Jon
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