[Haskell-cafe] how to call a callback in a haskell dll

Kees Bleijenberg k.bleijenberg at lijbrandt.nl
Fri Nov 15 08:39:06 UTC 2013

My program creates a Windows dll. The calling program calls a function with
strings as parameters. Works fine. 

I want to add a extra parameter. This extra parameter is a callback:  a
function Int -> Int: stdcall. In Haskell I want to call this function.  So I
have to convert the pointer to a (formal) Haskell function.

In the examples for the FFI, Haskell provides the callback. I need an
example or documentation.





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