Yep your use case is a good one. It's my approach too and this set up should achieve it

The confusion about which loads up first --

The Haskell .a must have a main(). So it must be the entry point. So it must start first. It then launches the objc's "c_main" so that normal control/flow can occur.

Then you simply call your Haskell code whenever you want and essentially you can just sleep the haskell's main forever

Hope this helps -- don't think I'm an expert, I just happen to have the identical questions as you and I started 2 days before you :)

On Dec 1, 2012, at 12:28 PM, Casey Basichis <caseybasichis@gmail.com> wrote:

Hi,

I've been reading about the FFI for getting Haskell to communicate with C code (C++ really).

My intention is to handle most of the app - the GUI events in C++ and sending all of the processing logic in Haskell - including a database etc.

Is the FFI the right tool for a situation where, while used extensively, Haskell is more or less there to take in data, like lists and spit out data like vectors etc back to C.

I am looking to get a few test running where I can pass data in an out of Haskell like vectors of floats.

Also, I noticed on the wiki example:

Haskell start
c_main

I was a little confused by this. Does Haskell load up first because its a library? I couldn't figure out where it was being called in the C code or why Haskell loads first. Not a biggie just a bit of an impediment in understanding how it all works.

Thanks,

Casey

--
Casey James Basichis
Composer - Cartoon Network
http://www.caseyjamesbasichis.com
caseybasichis@gmail.com
310.387.7540

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