Here's an example shared object compilation and use from j version 8.
Other examples exist at rosettacode.org. On the Tasks page search for
"call". If, on the other hand you want to embed j in another language
this is also solved at rosettacode.
http://rosettacode.org/wiki/Use_another_language_to_call_a_function#J
/*
on linux system this file is ./c.c
COMPILATION
$ gcc -c -fPIC c.c
$ gcc -shared -Wl,-soname,libmylittledemo.so.1 -o
libmylittledemo.so.1.0.1 c.o
USE IN J VERSION 8
$ J8
boxdraw_j_ 1
'./libmylittledemo.so.1.0.1 hi n' 15!:0 ''
world
+-+
|0|
+-+
*/
void hi(void) {
int puts(const char*);
puts("world");
}
Date: Wed, 9 Jul 2014 21:14:53 +0900
From: Jon Hough<[email protected]>
To:<[email protected]>
Subject: Re: [Jprogramming] DLL Lab
Message-ID:<[email protected]>
Content-Type: text/plain; charset="utf-8"
Thanks for replying,
I understand .cpp indicates a c++ file. What I wanted to do was follow the lab
that used this file, which seems to not exist.
I see your point about needing a compiler, but I assumed there was a way to
make a dll using J and perhaps the microsoft compiler (on windows, linux and
mac already have gcc inbuilt).
The next best thing is to link to the j.dll which I assume calls my script in
turn. But again, the lab seems to be geared toward J6, which I unceremoniously
deleted.
Having said that, I am pretty sure I read somehwere on the J wiki that it is
possible to build an executable file, so J does not need to be installed on the
computer. Can't find it now though.
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