How do I pass a Usercontrol Object to a subroutine?

If I have a subroutine how can I pass a usercontrol to that routine?

VB Code:

Private Sub testDevice(newGD As UserControl)
End sub
'call it using test Usercontrol

Gives me an "Invalid use of Base Class name" Error when called
I tried As Variant and As Object: same error.

The only way I can think of is to expose all the properties and methods of the Usercontrol object in the final control and pass myUserControl as Object. Any other way?

Did you use the UserControl name, not UserControl? Because when I tried that (using UserControl1, UserControl11 was what I passed to it), I got no error at all.

Yes, user control's name is the problem - you have to pass exact name (in my test it's a ucText):

VB Code:

Option Explicit
 
Private Sub Command1_Click()
    Test ucText1, "abc"
End Sub
 
Public Sub Test(uc As ucText, sText As String)
    uc.Text = sText
End Sub

This is the option I stated above, but if I do that then I have to export every property and method of the Usercontrol That I want to access. For instance If I use

VB Code:

'have to declare as object since this class is used with other types of objects.
Public Sub testDevice(newGD As Object)
   newGD.AutoRedraw = True
End Sub
End sub

Then I would have to create a Public Property in the control called AutoRedraw which calls the AutoRedraw property of the UserControl

VB Code:

Public Friend Property Get AutoRedraw() As Boolean
    AutoRedraw = UserControl.AutoRedraw
End Property
 
Friend Property Let AutoRedraw(ByVal New_AutoRedraw As Boolean)
    UserControl.AutoRedraw() = New_AutoRedraw
    PropertyChanged "AutoRedraw"
End Property

The control contains a class which needs to access the Usercontrol Object and it seems kind of silly if I have a class in the usercontrol itself that needs to access Properties of the Usercontrol, but before using that class, I have to export all the properties of the Usercontrol.
I can't even export them as Friend so that they cannont be seen from outside the usercontrol.

I though I had been able to do this once before, but maybe my alzheimer's is kicking in :)

What is the difference between

VB Code:

myClass.testDevice UserControl

and

VB Code:

myClass.testDevice (UserControl)

You don't have to export every property and/or method - just a few of them but handle what you need internally by say passing certain value - just like SendMessage() function does.

Seeing from there, you're trying to call the class from the UserControl itself? You just can't have a line like myClass.testDevice UserControl, because UserControl is a reserved word. I don't know if Me works any better... before I make a fool of myself too badly: what is the exact code you use to call the class and where it is placed in?

There is no difference with those calls, (UserControl) and UserControl would be 100% the same.

Quote:

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There is no difference with those calls, (UserControl) and UserControl would be 100% the same.

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But there is a difference (UserControl) allows me to pass the user control object without error, but I still can't access any if its properties from within the subroutine.

Enclosing a function parameter in brackets forces it to be passed ByVal. I'm still trying to get my head around the rest of your problem.

OK, maybe I'm thick, but I have no idea what you're on about :)

You have a class object defined in your UserControl that needs to access properties of the usercontrol?

How about (in the class, let's assume your UserControl's name is Thing):

VB Code:

Private mobjParent As Thing
 
Friend Property Set ParentControl(ByRef pobjControl As Thing)
    Set mobjParent = pobjControl
End Property
 
Friend Property Get ParentControl() As Thing
    Set ParentControl = mobjParent
End Property

and in your usercontrol code, wherever you instantiate your class object

VB Code:

Set Classobjectwhatnot.ParentControl = Me

That should work. And then to reference your control from within the class just use

VB Code:

mobjParent.Whatever = Whoever

Unless, I've completely misunderstood :)

OK maybe this will make it more clear.
Here is my Class

VB Code:

'In a class module - Class1
'have to declare as object since this class is used with other types of objects.
Public Sub testDevice(newGD As Object)
   newGD.AutoRedraw = True
End Sub

Here is my control

VB Code:

'In a control module - MyControl
Private myClass As Class1
 
Public Sub Test()
    'I can access properties of the Usercontrol object here
    UserControl.AutoRedraw = True
    'but I can't pass the object to my class
    Call myClass.testDevice(UserControl)
End Sub

And the form

VB Code:

'In a form - Form1
Private myClass As Class1
 
Private Sub Command1_Click()
    Set myClass = New Class1
    'this works
    myClass.testDevice Me
    'this works
    myClass.testDevice Picture1
    
    'this doesn't work
    MyControl1.Test
 End Sub

Clear as mud?

Don't pass UserControl. That is the base class. You want to pass Me which is an object instance reference for the current control object.

VB Code:

myClass.testDevice Me

Also, I saw a mention of Friend procedures somewhere above. I don't know if you still have problems with them but if you want to access Friend-scoped methods of a class you need to cast your late-bound reference to an early-bound reference because the Friend methods are not part of the class interface which late-binding relies on.

Quote:

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Don't pass UserControl. That is the base class. You want to pass Me which is an object instance reference for the current control object.

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This is what confuses me. If UserControl were truly a base class then I wouldn't be able to do something like

VB Code:

UserControl.AutoRedraw = True

just as I can't act on Class1 but have to act on MyClass. But UserControl is an object. But I guess I will export all the properties and methods of the Usercontrol object so I can access them.

Quote:

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you need to cast your late-bound reference to an early-bound reference

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Can you explain how one does this?

Well it confuses me too! Have you tried passing Me instead? That should work.

Quote:

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Originally Posted by moeur

Quote:

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Originally Posted by penagate

you need to cast your late-bound reference to an early-bound reference

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Can you explain how one does this?

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VB Code:

Public Sub testDevice(newGD As Object)
Dim objControl As MyControl
    Set objControl = newGD
    ' Let's say AutoRedraw is a Friend-scoped property
    objControl.AutoRedraw = True
    Set objControl = Nothing
End Sub

Quote:

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Have you tried passing Me instead?

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Me passes a refernce to the control itself not the Usercontrol Object. So, if you pass Me you will only see properties exposed in the control. I've resigned myself to the fact that I am going to have to expose all those properties and in a public manner too since early-binding doesn't seem to be an option.

Aaaaahhhh... Now I get ya :)

You are going to have to expose the properties yes.