April 2002
Intermediate to advanced
688 pages
19h 51m
English
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Name
AddressOf Operator
Syntax
AddressOf procedurename-
procedurename(required) The name of a procedure that is referenced by the procedure delegate
Description
The AddressOf operator returns a procedure
delegate instance that references a specific procedure.
The AddressOf operator is used in the following
situations:
If a parameter to a procedure (a VB procedure or a Win32 API function) requires a function pointer (the address of a function), then we can pass the expression:
AddressOf functionname
where
functionnameis the name of the function. This function is called a callback function.AddressOfis also used to create delegate objects, as in:delg = New ADelegate(AddressOf obj.AMethod)
AddressOfis used to bind event handlers to events through theAddHandlerstatement:AddHandler Form1.Click, AddressOf Me.Form1Click
Examples of all three applications of AddressOf
can be found in Section 7.1 in Chapter 7.
VB.NET/VB 6 Differences
In VB 6, the AddressOf operator can only be used
in a call to a Windows API function. Moreover, the argument passed to
AddressOf must be the name of a procedure in a
standard code module. However, in VB.NET these restrictions no longer
apply.
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