| > the automated ones, seemed to handle the case of passing numerical | > arrays to C, and having them get updated and passed back. That is my | > primary interest in the FFI and yet no obvious solution or example | > could be found after days of internet searching and pouring over | > tutorials etc. | | Regarding arrays, generally you'd use a Foreign array, allocate it on | the C side, and access it via a Foreign Ptr, no marshalling. | | Also, feel free to ask advice on haskell-cafe@haskell.org, or on the | #haskell irc channel. There's lots of experts only too happy to help | out. All true. Still, Matthew is by-definition correct: he was strongly motivated, and yet failed to find the relevant material. Indeed, concerning the question of passing array values between C and Haskell, there may be no overview or tutorial, thus far. Matthew, the entire Haskell.org website is a Wiki. You might spare someone else the pain that you went through by starting a "Duffers guide to the Haskell FFI" that contains the information you wished you'd known on day 1. I'm sure you'd get lots of help on the #haskell IRC if you did so. Simon