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- How can I install ctypes?
- How should I install libffi on Mac OS X?
- How can I build ctypes with debug support?
- Does ctypes work on Windows?
- How can I print ctypes values in the toplevel?
- What's the build process for code that uses stub generation ?
- Why does stub generation use functors?
- Does stub generation support the "noalloc" and "float" flags?
- What's the purpose of the
-Wl,-no-as-neededflag?
- What's the best way to bind C functions that act on strings?
- How can I deal with null pointers?
- Does ctypes support bigarrays?
- How can I call variadic functions?
- How can I call C macros?
- How can I call compiler builtins?
- How can I bind to functions that set errno?
- How can I declare an incomplete type?
- How can I represent structures with bit-field members?
- How does ctypes handle struct layout?
- How can I represent packed structs?
- How can represent structs that use the "struct hack"?
- How can I attach finalisers to objects created by ctypes?
- When should I use finalisers?
- What do I need to know about the garbage collector?
- When does ctypes copy objects?
- What's the purpose of views?
- How can I cast between types?
- How can I access global C variables?
- How can I bind to C++ code?
- How can I expose OCaml code to C?
- How can I improve the performance of my ctypes code?
Use the ctypes.top package. Loading the package installs printers for various ctypes values. You can load the package using Findlib's #require directive:
# #use "topfind";;
- : unit = ()
Findlib has been successfully loaded. Additional directives:
#require "package";; to load a package
#list;; to list the available packages
#camlp4o;; to load camlp4 (standard syntax)
#camlp4r;; to load camlp4 (revised syntax)
#predicates "p,q,...";; to set these predicates
Topfind.reset();; to force that packages will be reloaded
#thread;; to enable threads
- : unit = ()
# #require "ctypes.top";;
$HOME/.opam/4.01.0/lib/ocaml/unix.cma: loaded
$HOME/.opam/4.01.0/lib/ocaml/bigarray.cma: loaded
$HOME/.opam/4.01.0/lib/ocaml/str.cma: loaded
$HOME/.opam/4.01.0/lib/ctypes: added to search path
$HOME/.opam/4.01.0/lib/ctypes/ctypes.cma: loaded
$HOME/.opam/4.01.0/lib/ctypes/ctypes-top.cma: loaded
# open Ctypes;;Once the package is loaded, the results of expressions that evaluate to C type descriptions are printed using C declaration syntax. For example, the type "array of 10 floats" is printed as float[10]:
# array 10 float;;
- : float carray typ = float[10]and the type "function accepting two ints and returning a pointer to an array of 10 chars" is printed as follows:
# int @-> int @-> returning (ptr (array 10 char));;
- : (int -> int -> char carray ptr) fn = char(*(int, int))[10]C values are also printed out, in a form similar to C's initializer syntax. Here's how ctypes prints an array of three floats:
# CArray.of_list float [1.0; 2.0; 3.0];;
- : float carray = { 1, 2, 3 }There's a mailing list hosted on lists.ocaml.org and mirrored on gmane:
If you find a bug, or would like to propose or contribute a new feature, please visit the GitHub issue tracker