A while ago I built a Haskell DLL that had to be invoked from Excel.
For some reason (I do not remember exactly why) it did not work directly,
so I wrote a small wrapper DLL in C++ that invoked Haskell functions.
The wrapper DLL was invoked by Excel via COM.
As regards your example, the only thing that springs to my mind is:
check that the calling convention is set correctly (that is, to stdcall
instead of ccall).
Cheers,
Cyril
2007/6/19, Lewis-Sandy, Darrell
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?