# \[ANN\]: ctypes 0.12.0

**URL:** <https://discuss.ocaml.org/t/ann-ctypes-0-12-0/255>\
**Category:** Community\
**Tags:** ffi, announce\
**Created:** [May 23, 2017, 11:15am UTC](https://discuss.ocaml.org/t/ann-ctypes-0-12-0/255 "2017-05-23T11:15:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![yallop](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/yallop/32/517_2.png) [@yallop](https://discuss.ocaml.org/u/yallop)\
**Post date:** [May 23, 2017, 11:15am UTC](https://discuss.ocaml.org/t/ann-ctypes-0-12-0/255/1 "2017-05-23T11:15:47Z")

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I’m happy to announce a new release of ctypes, 0.12.0, available for installation via OPAM.

Ctypes 0.12.0 contains a number of changes, some of which introduce small incompatibilities with previous releases:

- Support for Fortran-layout bigarrays, recently discussed here:  
[Interfacing Fortran with OCaml](http://lambda-diode.com/software/ocaml/scientific/fortran) ([reddit discussion](https://www.reddit.com/r/ocaml/comments/6azyv3/interfacing_fortran_with_ocaml/))  
[some love for FORTRAN](https://github.com/ocamllabs/ocaml-ctypes/issues/509)  
The design is described in [PR 523](https://github.com/ocamllabs/ocaml-ctypes/pull/523)

- Use the ‘integers’ package to provide signed and unsigned types ([issue 446](https://github.com/ocamllabs/ocaml-ctypes/issues/446), [PR 515](https://github.com/ocamllabs/ocaml-ctypes/pull/515))

In both cases the types have changed slightly, but the behaviour is unchanged, so code that continues to build with the new release should be unaffected.

The [release notes](https://github.com/ocamllabs/ocaml-ctypes/blob/0.12.0/CHANGES.md) have further details of the changes in this release and recent point releases.

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**Author:** ![Nobody\_Gone](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/nobody_gone/32/1418_2.png) [@Nobody\_Gone](https://discuss.ocaml.org/u/Nobody_Gone)\
**Post date:** [September 26, 2017, 12:01pm UTC](https://discuss.ocaml.org/t/ann-ctypes-0-12-0/255/2 "2017-09-26T12:01:47Z")

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I’m a guy who has to work with FFI a lot, and Ctypes is the best implementation I have ever used by a pretty wide margin, keep up the great work