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Date: | 2010-02-11 (11:16) |
From: | John Whitington <john@c...> |
Subject: | Re: [Caml-list] Ocaml, Objective-c, and XCode |
Hi Andrew, On 11/02/2010 01:28, Andrew Webb wrote: > Hi there, > > I have a few questions relating to using Ocaml with objective-c for anyone who programs on a Mac. I am aware that there aren't any real bindings between ocaml and objective-c/cocoa, so I am investigating rolling my own. So: > > 1) Does anyone have experience in interfacing ocaml and objc? Is it difficult? > 2) Does anyone have a small example project that does mix these two languages? I have looked at unison, but it is too big for me to get my head around. I am thinking more on the scale of the ubiquitous Currency Converter... > 3) Does anyone who is mixing these languages use Xcode to do so? If so, what steps do you need to go through to set that up? > > A big thanks to anyone who can answer (some of) these questions. I am trying to decide whether to use haskell or ocaml for my next cocoa application, as these are the two languages I am most comfortable. I have recently found an excellent description of how to do this using haskell (http://tscheff.blogspot.com/2010/02/currync-converter-using-haskell-with.html) and was wondering if there were such resources for ocaml. I've just released a product written in this way: http://www.coherentpdf.com/proview.html I just have a normal makefile which builds a .a library from the ocaml code and its C wrapper as per the instructions in the ocaml manual. The xcode project then uses the .a and the .h of the wrapper and a few extra compilation and linking flags. Doubtless with a little bit more effort, Xcode could be made to call the ocaml makefile. Here's the OCaml makefile: mklib: ocamlc cpdf.mli; ocamlopt -c -I . unix.cmxa str.cmxa bigarray.cmxa cgutil.cmxa camlpdf.cmxa cpdf.ml; ocamlc cpdflib.mli; ocamlopt -c -I . unix.cmxa str.cmxa bigarray.cmxa cgutil.cmxa camlpdf.cmxa cpdf.cmx cpdflib.ml; ocamlc cpdflibc.mli; ocamlopt -c -I . unix.cmxa str.cmxa bigarray.cmxa cgutil.cmxa camlpdf.cmxa cpdf.cmx cpdflib.cmx cpdflibc.ml; ocamlc cpdflibwrapper.c; ocamlopt -output-obj -o cpdflibc.o unix.cmxa str.cmxa bigarray.cmxa cgutil.cmxa camlpdf.cmxa cpdf.cmx cpdflib.cmx cpdflibc.cmx; cp /usr/local/lib/ocaml/libasmrun.a cpdflib.a; ar r cpdflib.a cpdflibc.o cpdflibwrapper.o test: zlibstubs.o cpdflib.a cc -m32 -c cpdflibc-test.c -o cpdflibc-test.o; \ cc -m32 -L'/usr/local/lib/ocaml' -lunix -lbigarray -lstr -lz -o test cpdflibc-test.o zlibstubs.o cpdflib.a (The 'test' target shows you the kind of compiler and linker flags you'd need to put into XCode). Basically, once you've got the usual ocaml/c interface done, the Xcode part is no problem. Cheers, -- John Whitington Director, Coherent Graphics Ltd http://www.coherentpdf.com/