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 that use more than 128Mb of heap won't work when compiled dynamically on Windows (they should be fine statically compiled)." (See http://haskell.org/haskellwiki/GHC:FAQ#My_program_that_uses_a_really_large_h....) I have no clue what those horrible reasons might be, but you can limit the heap used by the Haskell DLL by setting the environment variable GHCRTS=-M128m Regards, Cyril ___

| From: Gupta, Nikunj (London) [mailto:Nikunj_Gupta@ml.com] | Sent: 25 September 2006 10:31 | To: Simon Peyton-Jones | Subject: RE: [Haskell-cafe] Haskell DLL crashes Excel | | Hello Simon, | | Nice to hear from you. I haven't really been working with Haskell but I | posted the message to that list since that was the only list I was able | to locate even remotely referring to the problem I was facing. | I have a c++ code which I try to compile as a dll. When debugging the | code works fine but as soon as I compile it for release and launch an | independent process not attached to VC++ it crashes. Do you have any | suggestions with regards to the project settings that might be causing | the same. | | Any sort of help would be much appreciated | Regards | Nikunj