VB6 AddressOf operator Migration

31. March 2009 09:14 by Mrojas in General  //  Tags:   //   Comments (0)

I was looking into ways to migrate something like the AddressOf operator in VB6. I read in some forums that I could use a delegate, but I hadn’t seen a code sample, so I started googling until I found this great post.

It provided a great example of how to pass a pointer to a function. I am attaching here the code so you can benefit from this too.


Remember to put the Working directory pointing to the output directory of the C DLL. In my case it is


The idea in general is like this:

/// <summary>
/// Simple callback function.
/// </summary>
/// <param name="a">Some integer parameter.</param>
public delegate void CBFUNC(int a);

/// <summary>
/// Demo of a simple callback.
/// </summary>
/// <param name="f">Function to call back to</param>
/// <param name="a">Parameter which will be returned through the callback</param>
public static extern void DoCallback(CBFUNC f, int a);