How to read random bytes in RAM with C++ (For Random Number Generator)？

I wanna read random bytes and fill into byte array as the random numbers generator. And then I want to call this in C#. My codes look below (C++ in VS2015):

#include<iostream>
using namespace::std;

    void main() 
    {
            unsigned char *pointer = (unsigned char*)malloc(0);
            unsigned char *writer = pointer;
            for (int i = 0; i < 10; i++)
            {
                cout << (unsigned short)(*writer) << endl;
                writer += sizeof(writer);
            }
            free(pointer);
            system("pause");
    }

There's a very strange problem. Each time I run the console app, the first 2 bytes are ALWAYS the same. But in my mind I hope that each time I run the app, the result is NOT the same.

So:

1) Is my algorithm right?

2) How to solve this?

3) Can I wrap this by exporting it to dll and then call it in the C#? How to do with that?