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 thin
I noticed recently that the website of CUFP conference (Commercial Uses of
Function Programming), which used to be at http://www.galois.com/cufp,
is not accessible anymore.
Does anybody know where it moved?
Cyril
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A few people recently asked how to pass a string between a Haskell DLL
and Excel.
I attach the proof-of-concept code that I wrote a while ago; it
demonstrates passing
a string from Excel to Haskell and the other way. Most of the C++ code
is taken
from code examples at http://msdn.microsoft.com
Matthew,
As regards the symbols that end with _closure, I believe you can
resolve them by adding
-package parsec
to the ghc command line (as far as I can see, all the symbols you
list come from the parsec package).
I don't know, though, what to do with the undefined symbols from
matrixstack. You
Nikunj,
The symptoms that you describe hint at some incorrect pointer handling.
I believe the culprit is that pesky BSTR. I will try to dig up the code
that
I wrote a while ago to pass a BSTR to Haskell.
Meanwhile, another hint. The GHC FAQ 1.4.1 says:
"For utterly horrible reasons, programs t
Andreas Marth wrote:
> As you might now already know I try to let VBA call Haskell via a DLL.
I had to do this a while ago; the best I could come up with was:
1. Make a Haskell DLL that exports plain C-style interface.
2. With Visual Studio, make a COM DLL that exports the interfaces to
be used
