AddressOf operator

[EnCocytus]

ALright, Ineed some help with the addressOf operator. I am using a .Dll file that requires a callback.
But I keep getting an error message "Invalid use of AddressOf operator". Here is an exerpt of my code.

Private Declare Function client Lib "WinSox.dll" _
    Alias "WinClient" (ByVal ip As String, ByVal port As Integer, ByVal addrFunct As Long) As Integer

Private Sub Command3_Click()

    Dim nret As Integer

    client "127.0.0.1", 8888, AddressOf showMsg

End Sub 

Public Function showMsg() As Integer

    MsgBox "showMsg()"
    showMsg = 1
    
End Function

From what I can tell, I'm using the AddressOf operator right, and I now it's not the .Dll. I've also tried using
a function like

Private Sub Command3_Click()

    Dim nret As Integer

    client "127.0.0.1", 8888, FuncAddr(AddressOf showMsg)

End Sub 

Private Function FuncAddr(ByVal pfn As Long) As Long
    FuncAddr = pfn
End Function

But I still get the error. What am I missing? Thanks in advance.

1001100 1110101 1101011 1100101

 

[strongm]

showMsg needs to go in a module

 

[chiph]

Strongm is correct - you can only use AddressOf with code that is contained in a Module (.bas).

The reason is if the code is in a class, the runtime can't tell which instance of the class to call. Could be instance "A" or instance "B" ... it doesn't know what you intended.

This problem is solved in .NET because the classes can have static methods, which are methods common to all instances of a particular class.

Chip H.