Passing Arrays from C++ to Javascript using Nan

[Martin Probst]

Hi all,

I am using the following C++ code to read values from an ADC. HandleOKCallback is properly called and adc and volt arrays are being filled with data.

 class ReadWorker : public Nan::AsyncWorker {

    public:

      ReadWorker(Nan::Callback *callback, int channel): Nan::AsyncWorker(callback), channel(channel) { }

      void Execute() {

        ...

      }

      void HandleOKCallback() {

        Nan:: HandleScope scope;

        Local<Value> argv[3];

        argv[1] = Nan::New<Array>(*adc),

        argv[2] = Nan::New<Array>(*volt);

        if (!initialized) {

          argv[0] = Nan::Error("failed to initialize ADC");

        } else if (failed) {

          argv[0] = Nan::Error("failed to read ADC");

        } else {

          argv[0] = Nan::Null();

        }

        callback->Call(3, argv);

      }

   private:

    int channel;

    int32_t adc[8];

    int32_t volt[8];

    ...

However the following Javascript yields an error under node.js telling me that adc and volt are not available.

ad.read(channel, function(err, adc, volt) {

   end = new Date().getTime();

    if (err) {

      console.warn('' + err);

    } else {

      var elapsed = end - start;

      console.log("adc: %s, volt: %s%%, time: %dms", adc[7].toFixed(2), volt[7].toFixed(2), end - start);

    }

  });

I assume that there is something wrong with the code highlighted in red above but I don't get it. Any help is appreciated!

Thanks,

Martin.