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Error 430: Class does not support Automation or does not support expected interface

Posted on 2006-06-30
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Last Modified: 2013-12-25
Hi,

I have a VB6 Add-In. I've written code to create a menu item on the "Add-Ins" menu and a CommandBar button on the "Standard" toolbar (both coded in the OnStartupComplete event for certain reasons).

The menu item works perfectly so no problem on that front...

However, when I try to add a new Control on the Standard toolbar the program falls over with the error message from the title.

Here's the code I'm using for this purpose:

Dim WithEvents MyButton As CommandBarButton  (declared at class-level in the Connect class)

    Set oCommandBars = VBInstance.CommandBars
    If oCommandBars Is Nothing Then
        ' Outlook has the CommandBars collection on the Explorer object
        Set oCommandBars = VBInstance.ActiveExplorer.CommandBars
    End If
   
    Set oStandardBar = oCommandBars.Item("Standard")
    If oStandardBar Is Nothing Then
        ' Standard bar not found: use the 'Text Editor' toolbar
        Set oStandardBar = oCommandBars.Item("Text Editor")
    End If
       
    ' Ensure that the 'Standard' toolbar is enabled & visible
    oStandardBar.Enabled = True
    oStandardBar.Visible = True
 
    ' In case the button was not deleted, use the exiting one...
    'Set MyButton = oStandardBar.Controls.Item("MyAddIn")
    For I = 1 To oStandardBar.Controls.Count()              
        If oStandardBar.Controls.Item(I).Tag() = "MyAddIn Button" Then
            ' My button's tag was found and hence my button already exists...
            ' Set my button variable to it
            Set MyButton = oStandardBar.Controls.Item(I)
            Exit For
        End If
    Next
   
    '... otherwise, create a new button
    If MyButton Is Nothing Then

        Set MyButton = oStandardBar.Controls.Add(1)      --> this is the statement which generates the error I've mentioned!!!!!!!!!
       
       ...
    End If

Other information...
I'm using:
    VB6 (SP5)
    Office 2003 (v.11)
    Windows XP Pro
The 3 references added automatically by the Add-In project when I created it are:
   Microsoft Office 11.0 Object Library
   Microsoft Add-In Designer
   Microsoft Visual Basic 6.0 Extensibility

Has anyone come across this problem? What's the workaround?

Thanks!



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Question by:sterlingdev
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3 Comments
 
LVL 8

Accepted Solution

by:
hiteshgupta1 earned 500 total points
ID: 17029752
0
 
LVL 9

Expert Comment

by:lojk
ID: 17037675
are you sure that thte controls collection isnt zero based?

i.e.
For I =  To oStandardBar.Controls.Count()-1

and

 Set MyButton = oStandardBar.Controls.Add(0)    
0
 

Author Comment

by:sterlingdev
ID: 17041570
Thanks to all!
However, I'm giving the points to hiteshgupta1 as the article mentioned is interesting and could prove useful in the future...

However, the workaround which solved my problem is as folows:

I replaced the module-level declaration of my button...
Dim WithEvents myButton As Office.CommandBarButton

with...
Dim myButton As Office.CommandBarButton
Dim WithEvents MenuHandler2 As CommandBarEvents

Then, at the bottom of the event where I wanted to create the commandbar button I added the following code:
Set MenuHandler2 = VBInstance.Events.CommandBarEvents(myButton)

Obviously the event fired when the user clicks my button will be:
Private Sub MenuHandler2_Click(ByVal CommandBarControl As Object, handled As Boolean, CancelDefault As Boolean)
...
End Sub
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