Passing an object byRef

[Venkat Venkataramanan]

Hello:

I have an object foUser defined in my main MDI form. I
instantiate this object in the MDI form and pass it into
a child form by reference as:

Dim foUser as New Users.User

Dim formChild as New frmChild(fouser)

The childform's is coded as:

Private foUser as Users.User
Public Sub New (ByRef poUser as Users.User)
fouser = poUser
End Sub

Private sub btnClose_clicked

Dim loUser as New Users.User

foUser = loUser
Me.Closeform

End Sub

However, when the object is returned to the MDI Parent,
it is never changed.

What I am I doing wrong?

Venkat

[Jerry]

Venkat,

I think your problem is one of the scope of the variables. If you run this
in debug and notice both the values and the memory location of the variables
you may find your problem.
"Venkat Venkataramanan" <th****@hotmail.com> wrote in message
news:1e****************************@phx.gbl...

Hello:

I have an object foUser defined in my main MDI form. I
instantiate this object in the MDI form and pass it into
a child form by reference as:

Dim foUser as New Users.User

Dim formChild as New frmChild(fouser)

The childform's is coded as:

Private foUser as Users.User
Public Sub New (ByRef poUser as Users.User)
fouser = poUser
End Sub

Private sub btnClose_clicked

Dim loUser as New Users.User

foUser = loUser
Me.Closeform

End Sub

However, when the object is returned to the MDI Parent,
it is never changed.

What I am I doing wrong?

Venkat

[Herfried K. Wagner [MVP]]

Hello,

"Venkat Venkataramanan" <th****@hotmail.com> schrieb:

I have an object foUser defined in my main MDI form. I
instantiate this object in the MDI form and pass it into
a child form by reference as:

Dim foUser as New Users.User

Dim formChild as New frmChild(fouser)

The childform's is coded as:

Private foUser as Users.User
Public Sub New (ByRef poUser as Users.User)
fouser = poUser
End Sub

Private sub btnClose_clicked

Dim loUser as New Users.User

foUser = loUser
Me.Closeform

End Sub

However, when the object is returned to the MDI Parent,
it is never changed.

'foUser' is a variable pointing to the instance passed to the class, if you
set 'foUser' to an other instance, this won't change the original object.

--
Herfried K. Wagner
MVP · VB Classic, VB.NET
http://www.mvps.org/dotnet