How exactly do you mean to combine "ffi" and
"--shell-escape" to work with latest ConTeXt/LuaTeX?
In usual luatex, ffi needs --shell-escape, since ffi
is dangerous from the point of view of the security.
As you know, ConTeXt allows --shell-escape, so the
following works with context test.tex.
%
% context test.tex
%
\starttext
\placeformula
\startformula
j_1(2.387) =
\startluacode
local ffi = require("ffi")
ffi.cdef[[
double _j1(double x);
]]
local mscrt = ffi.load("msvcrt")
tex.print(mscrt._j1(2.387))
\stopluacode
\stopformula
\stoptext
In the above example, a function _j1(x) in msvcrt.dll
is evaluated. The msvcrt.dll must be loaded as above,
because standard C library is linked statically.
The following DLLs can be used without loading,
because luatex knows them:
SHLWAPI.dll
WSOCK32.dll
USER32.dll
ADVAPI32.dll
SHELL32.dll
KERNEL32.dll
WS2_32.dll
GDI32.dll
Note that you may not be able to use "DLL Lua Modules"
in this way. I don't know details. Try various cases.
Best,
Akira
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