Luigi has shown me a simple and useful application of ffi:
In the case of lua(jit)tex in W32TeX, which are used in
context, standard C libraries are linked statically.
Thus it is necessary to load a necessary DLL for standard
C functions, like the following meaningless example:
\starttext
$$
j0(1.765)=
\startluacode
ffi=require("ffi")
ffi.cdef[[
double _j0(double x);
]]
-- In the case of lua(jit)tex in W32TeX, C libraries are linked
-- statically. Thus it is necessary to load a necessary DLL.
local msvcrt=ffi.load("msvcrt")
tex.print(msvcrt._j0(1.765))
\stopluacode
$$
\stoptext
It is expected that Windows APIs in the following libs
can be used without loading DLL:
WSOCK32.dll
USER32.dll
ADVAPI32.dll
SHELL32.dll
GDI32.dll
KERNEL32.dll
WS2_32.dll
Best,
Akira
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