Re: C binding with D function

[bachmeier via Digitalmars-d-learn]

On Wednesday, 3 August 2016 at 15:24:56 UTC, llaine wrote:
On Wednesday, 3 August 2016 at 15:14:24 UTC, Kagamin wrote:
On Wednesday, 3 August 2016 at 15:08:51 UTC, llaine wrote:
So basically I have to create wrapper.c ?

Yes, but you should write it in D. Runtime initialization is 
at https://dlang.org/phobos/core_runtime.html#.Runtime

Okay I tried to do something like this


import std.stdio;
import core.runtime;

extern(C)
{

  void foo(string str)
  {
    writeln(str);
  }

}

void main(){
  Runtime.initialize();
  Runtime.terminate();
}

Am I doing it wrong ?
Still getting a Segmentation fault

I have no way to test this, but translating the example to D, I 
get this:

import core.runtime;
import std.stdio;

extern(C) {
  example_init() {
    Runtime.initialize();
  }

  example_exit() {
    Runtime.terminate();
  }

  void foo(int x) {
    writeln(2*x);
  }
}

// No main
// compile as libffi-example.so

Then in Ruby:

module Example
    extend DL::Importable
    dlload "./libffi-example.so"
    extern "void example_init()"
    extern "void example_exit()"
    extern "void foo(int)"
end

Example.example_init
Example.foo(3)
Example.example_exit