[Haskell-cafe] Re: FFI and Excel VBA

We don't recommend calling shutdownHaskell() from DllMain(). Some information here: http://haskell.org/haskellwiki/GHC/Using_the_FFI#Debugging_Haskell_DLLs It should be safe to call shutdownHaskell() (aka hs_exit()) *before* unloading a DLL, and before exiting the program. Cheers, Simon Lennart Augustsson wrote:

There is a number of problems, I'm not sure which one you are encountering. Here are some that I remember:

The sample C code doesn't shut down the ghc runtime properly when the DLL is unloaded. This causes a timer interrupt to jump into the void. This is easily fixed with a couple of more lines of C.

The ghc runtime installs handlers for various things that it shouldn't touch when used as a DLL.

-- Lennart

On 6/19/07, *Lewis-Sandy, Darrell * mailto:darrelll@amgen.com> wrote:

I am new to using the Haskell FFI, and have been trying to implement the example in section 11.6 of the GHC user's guide.

I have finally gotten to the point where my dll compiles (there is a missing space in the mainDll.h code at line 4:12) using GHC 6.6.1, and used the declare statement to expose the "adder" function in Excel VBA. My VBA Code is given below:

Private Declare Function adder Lib " adder.dll" Alias "adder@8" (ByVal x As Integer, ByVal y As Integer) As Integer

Private Sub test()

Debug.Print adder(1, 2)

End Sub

*My problem is this:*

The function works fine (the immediate window displays 3), but when I terminate Excel, I get an application error ("The instruction at … referenced memory at … . The memory could not be read."). Does anyone else have any experience calling Haskell from VBA that might be relevant?

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