title: javascript equivalent for python ctypes with node-gyp
body: <p>I want to transform a python script into a javascript script. My python script loads a dll and use its API.</p>
  
  <pre><code>processings2D = ctypes.CDLL('processings2D.dll')
  print(processings2D.ImageProcessor2DCreate())
  </code></pre>
  
  <p>I try do to the same with node-gyp but my script doesn't find the dll.</p>
  
  <pre><code>console.log(processings2D.ImageProcessor2DCreate());
                        ^
  TypeError: Cannot load processings2D.dll library
  </code></pre>
  
  <p>test.js</p>
  
  <pre><code>var processings2D = require('./build/Release/processings2D.node');   
  console.log(processings2D.ImageProcessor2DCreate());
  </code></pre>
  
  <p>addon.cc</p>
  
  <pre><code>#include &lt;nan.h&gt;
  #include "processings2D/processings2D.h"
  
  HINSTANCE hDLL = NULL;
  typedef int(*Fn)();
  
  void ImageProcessor2DCreate(const Nan::FunctionCallbackInfo&lt;v8::Value&gt;&amp; info) {
      hDLL = LoadLibrary("processings2D.dll");
      if(!hDLL)
      {
          Nan::ThrowTypeError("Cannot load processings2D.dll library");
          return;
      }
  
      Fn fn = (Fn)GetProcAddress(hDLL, "ImageProcessor2DCreate");
      if (!fn) {
          Nan::ThrowTypeError("Could not load ImageProcessor2DCreate function");
          FreeLibrary(hDLL);
          return;
      }
  
      info.GetReturnValue().Set(Nan::New(fn()));
  }
  
  void Init(v8::Local&lt;v8::Object&gt; exports) {
      exports-&gt;Set(Nan::New("ImageProcessor2DCreate").ToLocalChecked(), Nan::New&lt;v8::FunctionTemplate&gt;(ImageProcessor2DCreate)-&gt;GetFunction());
  }
  
  NODE_MODULE(twoD, Init)
  </code></pre>
  
  <p>binding.gyp</p>
  
  <pre><code>{
    "targets": [
      {
        "target_name": "processings2D",
        "sources": [
          "addon.cc"
        ],
        "include_dirs": [
          "&lt;!(node -e \"require('nan')\")"
        ]
      }
    ]
  }
  </code></pre>
  
  <p>dll is in the Release folder <code>/build/Release/processings2D.dll</code></p>
  
  <p><strong>Am I in the right direction ?</strong></p>