Updated sample for Go 1.9

Makefile

@@ -0,0 +1,3 @@
+ALL:
+	go tool cgo go-node-ffi.go
+	go build -buildmode=c-shared -o go-node-ffi.so go-node-ffi.go

README.md

@@ -2,6 +2,8 @@
 
 An experiment using [Go 1.5](https://blog.golang.org/go1.5) [buildmode](https://golang.org/s/execmodes) to compile shared C libraries, and to subsequently access them through NodeJS bindings via [node-ffi](https://github.com/node-ffi/node-ffi).
 
+Update: also tested on Go 1.9, see troubleshooting section for more info.
+
 Simply put, let's try calling Go functions from JavaScript.
 
 
@@ -33,4 +35,20 @@ Tinker with the sample file `go-node-ffi.js` by running:
 
 ```shell
 node go-node-ffi.js
-```
+```
+
+## Troubleshooting
+
+If you get:
+
+```
+panic: runtime error: cgo result has Go pointer
+```
+
+Then try setting the following environment var:
+
+```
+export GODEBUG=cgocheck=0
+```
+
+This still needs to be resolved.

go-node-ffi.h

@@ -1,6 +1,6 @@
 /* Created by "go tool cgo" - DO NOT EDIT. */
 
-/* package github.com/mrsaints/go-node-ffi */
+/* package command-line-arguments */
 
 /* Start of preamble from import "C" comments.  */
 
@@ -11,6 +11,7 @@
 
 
 /* Start of boilerplate cgo prologue.  */
+#line 1 "cgo-gcc-export-header-prolog"
 
 #ifndef GO_CGO_PROLOGUE_H
 #define GO_CGO_PROLOGUE_H
@@ -28,14 +29,16 @@ typedef GoUint64 GoUint;
 typedef __SIZE_TYPE__ GoUintptr;
 typedef float GoFloat32;
 typedef double GoFloat64;
-typedef __complex float GoComplex64;
-typedef __complex double GoComplex128;
+typedef float _Complex GoComplex64;
+typedef double _Complex GoComplex128;
 
-// static assertion to make sure the file is being used on architecture
-// at least with matching size of GoInt.
+/*
+  static assertion to make sure the file is being used on architecture
+  at least with matching size of GoInt.
+*/
 typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];
 
-typedef struct { char *p; GoInt n; } GoString;
+typedef struct { const char *p; GoInt n; } GoString;
 typedef void *GoMap;
 typedef void *GoChan;
 typedef struct { void *t; void *v; } GoInterface;

go-node-ffi.js

@@ -2,35 +2,39 @@ var FFI = require("ffi");
 var Ref = require("ref");
 var Struct = require("ref-struct");
 
-var hw_path = "/home/mrsaints/Workspace/golang/src/github.com/mrsaints/go-node-ffi/go-node-ffi";
+var hw_path = "./go-node-ffi";
 
 /*
  * GoString ABI-compliant struct
  */
 var GoString = Struct({
-    p: "char *",
-    n: "int"
+    p: "string",
+    n: "int",
 });
 
 function NewGoString(v) {
     var _gs = new GoString();
-    _gs.p = Ref.allocCString(v);
+    _gs.p = v
     _gs.n = v.length;
     return _gs;
 }
 
+function GoStringToJsString(gostring) {
+  return gostring.p.slice(0, gostring.n)
+}
+
 var hw = FFI.Library(hw_path, {
-  "HelloWorld": ["string", []],
-  "Greet": ["string", [GoString]],
+  "HelloWorld": [GoString, []],
+  "Greet": [GoString, [GoString]],
   "Add": ["int", ["int", "int"]]
 });
 
 var helloWorld = hw.HelloWorld();
-console.log(helloWorld);
+console.log(GoStringToJsString(helloWorld));
 
 var addition = hw.Add(2, 4);
 console.log(addition);
 
 var john = NewGoString("John");
 var greeting = hw.Greet(john);
-console.log(greeting);
+console.log(GoStringToJsString(greeting));

package.json

@@ -3,14 +3,10 @@
   "version": "1.0.0",
   "description": "An experiment using Go 1.5 buildmode to compile shared C libraries, and to subsequently access them through NodeJS bindings via node-ffi.",
   "main": "go-node-ffi.js",
-  "devDependencies": {
-    "ffi": "^1.3.2",
-    "ref": "^1.0.2",
-    "ref-struct": "^1.0.1"
-  },
   "devDependencies": {},
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node go-node-ffi.js"
   },
   "repository": {
     "type": "git",
@@ -21,5 +17,10 @@
   "bugs": {
     "url": "https://github.com/MrSaints/go-node-ffi/issues"
   },
-  "homepage": "https://github.com/MrSaints/go-node-ffi#readme"
+  "homepage": "https://github.com/MrSaints/go-node-ffi#readme",
+  "dependencies": {
+    "ffi": "^2.2.0",
+    "ref": "^1.3.5",
+    "ref-struct": "^1.1.0"
+  }
 }