Hello Everyone, *Motivation:* I want to invoke C-code functions from Clojure: writing Java functions in Clojure.
*Plan of Attack:* Rather than go with the JNI approach I want to interface with C-Library via JNR-FFI (https://github.com/jnr/jnr-ffi) Based on some example of using JNR-FFI https://github.com/jnr/jnr-ffi-examples/blob/master/getpid/src/main/java/getpid/Getpid.java https://www.programcreek.com/java-api-examples/?api=jnr.ffi.LibraryLoader The wrapper in Java might look like ``` package blahblah; public class BlahNative { private static int[] intDummy; private static double[] doubleDummy; public BlahNative() { } public static native void native_a(char var0, char var1, int var2, int var3, int var4, double[] var7, int var8, int var9); static { lib = LibraryLoader .create(LibSodium.class) .search("/usr/local/lib") .search("/opt/local/lib") .search("/usr/lib") .search("/lib") .load(LIBRARY_NAME); initializeLibrary(lib); } } ``` Question: For my package ``` (defproject mypkg :dependencies [[org.clojure/clojure "1.10.1"] [com.github.jnr/jnr-ffi "2.2.0"]]) ``` How do I write the wrapper for the native functions in ``` (ns mypkg.native (:import [jnr.ffi LibraryLoader]) (:import [jnr.ffi.annotations IgnoreError]) (:import [jnr.ffi.provider FFIProvider])) ``` For the Java interop I am assuming the above namespace should be based on gen-class (http://clojure-doc.org/articles/language/interop.html). What is not clear to me is: *1. How does one create the `native` method* (since most (defn foo) are static methods)? *2. How do I access the native functions after loading* the Native Library (LibraryLoader.load(LIBRARY_NAME))? I am neither a C nor a Java expert so any guidance will be much appreciated. Thanks, Ngwua -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/clojure/3bd05d7a-297e-49cf-86d4-aec4a88c83cbn%40googlegroups.com.
