USB BarcodeScanner input on Unity3D

BarcodeScanner.cs

using System;
using System.Collections.Generic;
using System.Text;
using UnityEngine;

namespace AppKit
{
    /// <summary>
    /// Barcode Scanner Input
    /// 
    /// Tested on http://amzn.asia/6JDu51P
    /// </summary>
    public class BarcodeScanner : MonoBehaviour
    {
        public event Action<string> OnScanned;

        StringBuilder builder;

        void Start()
        {
            builder = new StringBuilder();
        }

        void Update()
        {
            string str = Input.inputString;
            if (!string.IsNullOrEmpty(str))
            {
                builder.Append(str);
            }

            if (Input.GetKeyDown(KeyCode.Return))
            {
                if (OnScanned != null)
                {
                    OnScanned(builder.ToString().TrimEnd('\r', '\n'));
                }
                builder.Clear();
            }
        }
    }
}