[SOLVED] Link Node.js C++ add-on with static library

I have a C++ project that is intended to perform some calculations. The C++ code will sit on a server that as back end to a browser based GUI. Node.js seems to be suitable for this job. I've gone through the tutorials and learnt to build C++ code to be used as a nodejs module.

For the sake of simplicity, I'd like to compile the C++ code as a static library. I could then write a C++ class which references this library which can then be used in the nodejs environment. The point of this is so I don't have to use node-gyp build to build my entire C++ project. This way I can further develop the C++ code without worrying too much about the front end.

To achieve this, I have done the following:

Built a simple C++ library as follows. Building this in Visual Studio 2013 to get the .lib file.

//MyClass.h
#pragma once
class MyClass
{
public:
    double Multiply(double a, double b)
    {
        return a*b;
    }
    MyClass();
    ~MyClass();
};

Created the C++ object to be used as a nodejs module like so:

// myobject.h
#ifndef MYOBJECT_H
#define MYOBJECT_H

#include <node.h>
#include <node_object_wrap.h>
#include "MyLib\MyClass.h"

namespace demo {

    class MyObject : public node::ObjectWrap {
    public:
        static void Init(v8::Local<v8::Object> exports);
        static MyClass* mycalcobj;

    private:
        explicit MyObject(double value = 0);
        ~MyObject();

        static void New(const v8::FunctionCallbackInfo<v8::Value>& args);
        static void PlusOne(const v8::FunctionCallbackInfo<v8::Value>& args);
        static v8::Persistent<v8::Function> constructor;
        double value_;


    };

}  // namespace demo

#endif

and the cpp file

    // myobject.cpp
    #include "myobject.h"

    //#include "worker.h"
    namespace demo {

        using v8::Function;
        using v8::FunctionCallbackInfo;
        using v8::FunctionTemplate;
        using v8::Isolate;
        using v8::Local;                 
        using v8::Number;
        using v8::Object;
        using v8::Persistent;
        using v8::String;
        using v8::Value;

        Persistent<Function> MyObject::constructor;

        MyObject::MyObject(double value) : value_(value) {
        }

        MyObject::~MyObject() {
        }

        void MyObject::Init(Local<Object> exports) {
            Isolate* isolate = exports->GetIsolate();

            // Prepare constructor template
            Local<FunctionTemplate> tpl = FunctionTemplate::New(isolate, New);
            tpl->SetClassName(String::NewFromUtf8(isolate, "MyObject"));
            tpl->InstanceTemplate()->SetInternalFieldCount(1);

            // Prototype
            NODE_SET_PROTOTYPE_METHOD(tpl, "plusOne", PlusOne);

            constructor.Reset(isolate, tpl->GetFunction());
            exports->Set(String::NewFromUtf8(isolate, "MyObject"),
                tpl->GetFunction());
        }

        void MyObject::New(const FunctionCallbackInfo<Value>& args) {
            Isolate* isolate = args.GetIsolate();

            if (args.IsConstructCall()) {
                // Invoked as constructor: `new MyObject(...)`
                double value = args[0]->IsUndefined() ? 0 : args[0]->NumberValue();
                MyObject* obj = new MyObject(value);
                obj->Wrap(args.This());
                args.GetReturnValue().Set(args.This());
            }
            else {
                // Invoked as plain function `MyObject(...)`, turn into construct call.
                const int argc = 1;
                Local<Value> argv[argc] = { args[0] };
                Local<Function> cons = Local<Function>::New(isolate, constructor);
                args.GetReturnValue().Set(cons->NewInstance(argc, argv));
            }
        }


        //define functions here
        void MyObject::PlusOne(const FunctionCallbackInfo<Value>& args) {
            Isolate* isolate = args.GetIsolate();
            MyObject* obj = ObjectWrap::Unwrap<MyObject>(args.Holder());
            double x = obj->value_;
            mycalcobj = new MyClass();

            x=mycalcobj->Multiply(2, x);

            obj->value_= x;

            args.GetReturnValue().Set(Number::New(isolate, obj->value_));
        }

    }  // namespace demo

Create the main cpp file to initialise

    #include <node.h>
    #include "myobject.h"

    namespace demo {

        using v8::Local;
        using v8::Object;

        void InitAll(Local<Object> exports) {
            MyObject::Init(exports);
        }

        NODE_MODULE(addon, InitAll)

    }  // namespace demo

The binding.gyp file is defined as:

    {
      "targets": [
        {
          "target_name": "cpphello",
          "sources": [ "cpphello.cpp", "myobject.cpp"],
          "libraries": [ "D:/East101/Adri/javascript/socketio/cpplib/build/x64/Debug/MyLib"]
        }
      ]
    }

Build the project using node-gyp configure build

I get the following messages:

    MyLib.lib(MyClass.obj) : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/OPT:ICF' specification [D:\East101\Adri\javascript\socketio\cpplib\build\cpphello.vcxproj]


    LINK : warning LNK4098: defaultlib 'MSVCRTD' conflicts with use of other libs;use /NODEFAULTLIB:library [D:\East101\Adri\javascript\socketio\cpplib\build\cpphello.vcxproj]

    myobject.obj : error LNK2001: unresolved external symbol "public: static class MyClass * demo::MyObject::mycalcobj" (?mycalcobj@MyObject@demo@@2PEAVMyClass@@EA) [D:\East101\Adri\javascript\socketio\cpplib\build\cpphello.vcxproj] D:\East101\Adri\javascript\socketio\cpplib\build\Release\cpphello.node : fatal error LNK1120: 1 unresolved externals [D:East101\Adri\javascript\socketio\cpplib\build\cpphello.vcxproj]

I need some assistance to either fix this error and make it work as I envision it or let me know if there's a better way. I'm quite new to C++ and coding in general so I may just be approaching this wrong.